Contents: Coring program; Petrographic report and core logs; Foundation and concrete properties; Stability analysis.
Topics: DTIC Archive, Pace,Carl E, ARMY ENGINEER WATERWAYS EXPERIMENT STATION VICKSBURG MS STRUCTURES LAB,...
The use of some type of shear reinforcement (lacing bars or stirrups) is required by current manuals for blast-resistant design. The primary purpose of this reinforcement is not to resist shear stresses, but rather to improve performance in the large-deflection region by tying the two principal reinforcement mats together. The shear reinforcement design criteria of the current design manuals, particularly the widely used Draft TM 5-1300, appear to be overly conservative. The design criteria are...
Topics: DTIC Archive, Woodson, Stanley C, ARMY ENGINEER WATERWAYS EXPERIMENT STATION VICKSBURG MS...
The problem of upgrading one-way reinforced concrete (R/C) slab floor systems for keyworker shelters was studied in this program. The objective was to develop competent designs for upgrading such systems that would use readily available materials, be easy to construct, and increase the load-carrying capacities of such systems to 50 psi or greater. Two upgrading methods were developed and evaluated: a wooden post method and a steel beam method. For the wooden post method, several 4- by 4-inch...
Topics: DTIC Archive, McVay,Mark K, ARMY ENGINEER WATERWAYS EXPERIMENT STATION VICKSBURG MS STRUCTURES LAB,...
The significance of dynamic biaxial material behavior of concrete in the study of structural response to seismic and other dynamic loadings is noted. A testing procedure is developed to examine this behavior for the case of monotonic, tensile-compressive loadings. The results of experiments for load ratios between uniaxial compression and uniaxial tension in which the time of application spanned from 10 min to 25 msec are presented. The tensile stress at failure is seen to decrease with an...
Topics: DTIC Archive, Mlakar,P F, ARMY ENGINEER WATERWAYS EXPERIMENT STATION VICKSBURG MS STRUCTURES LAB,...
The Structures Laboratory of the US Army Engineer Waterways Experiment Station has conducted research on cement-based composites for the Waste Isolation Pilot Project (WIPP) since 1977 in support of Sandia National Laboratories. Sealing shafts and plugging boreholes for closure of this geologic repository for radioactive wastes will require grouts and concretes. Salt- saturated grouts and concretes bond adequately to the bedded halite host rock. Fresh-water mixtures will plug and seal...
Topics: DTIC Archive, Gulick, Charles W, ARMY ENGINEER WATERWAYS EXPERIMENT STATION VICKSBURG MS STRUCTURES...
A literature review and evaluation was performed to determine the potential of developing a device to measure degree of consolidation of freshly placed concrete in situ for improving quality control. Standard techniques exist to determine the air content of concrete as it comes from the mixer but not in situ. The features of an ideal device are discussed as a goal in the development of an optimum device. Measurement fundamentals such as resolution, accuracy, data storage, display, cost, ease of...
Topics: DTIC Archive, Alexander, A M, ARMY ENGINEER WATERWAYS EXPERIMENT STATION VICKSBURG MS STRUCTURES...
Silica fume is a fine, siliceous powder that is a by-product of producing silicon metal or ferrosilicon in a reducing environment in an electric furnace. Recent research work on cementitious materials included characterization of such a silica fume from Alabama by chemical, physical, and petrographic tests. In addition, properties of mixtures of this fume with water and calcium hydroxide were studied. Compressive strengths were determined at different ages, and the composition and...
Topics: DTIC Archive, BUCK,Alan D, ARMY ENGINEER WATERWAYS EXPERIMENT STATION VICKSBURG MS STRUCTURES LAB,...
FRC (fiber reinforced concrete) has been used for repair of abrasion- erosion damaged areas such as stilling basins, conduits, sluiceways, and discharge laterals in hydraulic structures. However, the resistance of such concrete subjected to abrasive action of waterborne particles had not previously been evaluated. Thirteen concrete mixtures of three water-cement ratios ranging from 0.40 to 0.72, each containing one of four different types of steel fibers, were tested. As is true of concrete...
Topics: DTIC Archive, Liu, Tony C., ARMY ENGINEER WATERWAYS EXPERIMENT STATION VICKSBURG MS STRUCTURES LAB,...
There has been little research into the kinetic friction developed between surfaces of rapidly moving geologic materials. This report documents the results of laboratory friction tests conducted on prepared surfaces of a limestone, a dolomite, and a sandstone. The laboratory tests were conducted in a dynamic friction device in which one hollow cylindrical specimen was rotated while another specimen was pushed into it. The rate of rotation could be varied from 0.15 in./min to greater than 40,000...
Topics: DTIC Archive, Ehrgott, John Q, ARMY ENGINEER WATERWAYS EXPERIMENT STATION VICKSBURG MS STRUCTURES...
Drilling for field testing and laboratory testing was carried out as part of a stabilization program at the Marseilles Dam on the Illinois Waterway. An investigation conducted in early 1973 showed that tainter gate sections failed to meet current overturning criteria requirements. It was recommended that the gate sections be stabilized by installation of grouted, prestressed tendons. Physical property data of concrete and foundation rock for use in a stability analysis and the design of an...
Topics: DTIC Archive, Stowe,Richard L, ARMY ENGINEER WATERWAYS EXPERIMENT STATION VICKSBURG MS STRUCTURES...
An environmental assessment was necessary to investigate the potential impact of the Underground Technology Program on the environment. The existing test site environment as reviewed, alternatives to the proposed action were considered, and environmental consequences of the proposed action were analyzed. Environmental consequences included effects of construction activities, excavations, and test explosion phenomena on human health and safety, structures, biota, geology, air and water quality,...
Topics: DTIC Archive, Murrell, D W, ARMY ENGINEER WATERWAYS EXPERIMENT STATION VICKSBURG MS STRUCTURES LAB,...
This report documents the results of a blast vibriation monitoring program conducted in the vicinity of the proposed Tug Fork River Big Bend Cutoff. Explosive and traffic (railroad and highway) induced vibration data were measured at selected sites in the vicinity of the proposed excavation. Analysis of these data shows that the railroad induced maximum peak particle velocities are one-tenth or less (= or 0.2 in./sec) than the damage threshold for structures ( 2 in./sec) and one-fortieth or...
Topics: DTIC Archive, Joachim,Charles E, ARMY ENGINEER WATERWAYS EXPERIMENT STATION VICKSBURG MS STRUCTURES...
The distressed condition of the composite walls was characterized by saturated interior wall portions and water ponding on floors. The walls were of composite design involving brick, parged bedding, and concrete masonry units, with gypsum board as a final interior covering in certain areas. Two composite and two cavity wall models were built on concrete pedestals which represented floor slabs. The models were subjected to static heads of water and water spray applications simulating rain to...
Topics: DTIC Archive, Denson,Robert H, ARMY ENGINEER WATERWAYS EXPERIMENT STATION VICKSBURG MS STRUCTURES...
The ability of a mortar made using portland cement, fine aggregate, and water to resist attack by sulfates is affected by the proportions of the mortar (water-cement ratio and cement content), by the maturity, by the amount of tricalcium aluminate in the portland cement, by the presence of tricalcium aluminate-sodium oxide solid solutions with different structures and reactivities, and by the composition, reactivity, and amount of pozzolan used together with the portland cement. Cements...
Topics: DTIC Archive, Mather,Katharine, ARMY ENGINEER WATERWAYS EXPERIMENT STATION VICKSBURG MS STRUCTURES...
Deterioration of navigation lock wall concrete due to freezing and thawing is a serious problem which is usually attributed to the ineffectiveness or lack of a proper air-void system in the concrete. Most of the affected locks were constructed many years ago before air-entrained concrete began to be widely used. However, Lower Monumental Lock, one of the largest locks in the world, has only been in service for 10 years yet has serious surface deterioration. Depending on the extent of concrete...
Topics: DTIC Archive, Schrader,Ernest K, ARMY ENGINEER WATERWAYS EXPERIMENT STATION VICKSBURG MS STRUCTURES...
Deterioration of navigation lock wall concrete due to freezing and thawing is a serious problem which is usually attributed to the ineffectiveness or lack of a proper air-void system in the concrete. Most of the affected locks were constructed many years ago before air-entrained concrete began to be widely used. However, Lower Monumental Lock, one of the largest locks in the world, has only been in service for 10 years yet has serious surface deterioration. Depending on the extent of concrete...
Topics: DTIC Archive, Schrader,Ernest K, ARMY ENGINEER WATERWAYS EXPERIMENT STATION VICKSBURG MS STRUCTURES...
A conventional stability analysis (rigid body assumptions) was conducted to determine the approximate magnitude of the loads acting on top of the piles supporting the monolith. It was necessary to conduct in situ tests to determine the strength characteristics of the foundation material. For this purpose a Menard pressuremeter was used to determine the in situ horizontal subgrade modulus. The horizontal modulus of subgrade reaction was used in a three-dimensional direct stiffness analysis to...
Topics: DTIC Archive, Pace,Carl E, ARMY ENGINEER WATERWAYS EXPERIMENT STATION VICKSBURG MS STRUCTURES LAB,...
The Waste Isolation Pilot Plant (WIPP) facility is a research and development facility being developed by the US Department of Energy (DOE) near Carlsbad, New Mexico for the purpose of demonstrating the safe disposal of radioactive waste accumulated from the United States defense programs. The WIPP facility is located in a bedded-salt deposit 2150 ft (656m) below the ground surface. Sandia National Laboratories (SNL) is conducting a repository sealing Research and Development Program at the...
Topics: DTIC Archive, Ainsworth, Donnie L, ARMY ENGINEER WATERWAYS EXPERIMENT STATION VICKSBURG MS...
It is widely known that the United States owns and maintains many bridges throughout its highway system, and the Department of the Army owns and maintains over 1,500 bridges. These bridges are on U.S. military installations throughout the world, and they carry pedestrians, civilian and military vehicles, and trains. Like the U.S. infrastructure, these bridges require continual inspection, maintenance, and load capacity assessment. The objective of this report is to provide uniformity in the...
Topics: DTIC Archive, Ray, James C., ARMY ENGINEER WATERWAYS EXPERIMENT STATION VICKSBURG MS STRUCTURES...
The Olmsted Locks and Dam will be located on the Ohio River and the locks will be a W-frame type of structure, which is currently unprecedented within the Corps of Engineers. Because of this fact and due to the high fly ash concrete mixture planned for the project, and extensive nonlinear, incremental structural analysis (NISA) was performed. Parameters evaluated included two different placing schemes, plane stress and plane strain analyses, two different concrete mixtures, creep, and...
Topics: DTIC Archive, Garner, Sharon, ARMY ENGINEER WATERWAYS EXPERIMENT STATION VICKSBURG MS STRUCTURES...
The concrete in the walls and floor of the warm-water chute of the spillway of Raystown Dam, a relatively new structure (less than 10 years old), was showing an excessively rapid deterioration in quality. Surface concrete appeared extremely sandy and rough, resulting from an apparent dissolving away of cement paste and coarse aggregates. In addition to the surface problems, the walls separating the warm-water chute from the main spillway chutes contained interconnected voids, allowing water to...
Topics: DTIC Archive, Holland,Terence C, ARMY ENGINEER WATERWAYS EXPERIMENT STATION VICKSBURG MS STRUCTURES...
Cone index (CI) has been used successfully by the U.S. Army Engineer Waterways Experiment Station (WES) as a descriptor of soil strength in establishing empirical soil-vehicle relations for predicting the performance of ground-crawling vehicles. CI is a measure of the resistance of the soil to the penetration of a right-circular cone. CI is measured in pounds per square inch, but it is considered an undimensioned index for obvious reasons. Recent developments in analytical modeling of vehicle...
Topics: DTIC Archive, Rohani, Behzad, ARMY ENGINEER WATERWAYS EXPERIMENT STATION VICKSBURG MS STRUCTURES...
The problem of upgrading one-way reinforced concrete (R/C) slab floor systems for keyworker shelters was studied in this program. The objective was to develop competent designs for upgrading such systems that would use readily available materials, be easy to construct, and increase the load-carrying capacities of such systems to 50 psi or greater. Two upgrading methods were developed and evaluated: a wooden post method and a steel beam method. For the wooden post method, several 4- by 4-inch...
Topics: DTIC Archive, McVay,Mark K, ARMY ENGINEER WATERWAYS EXPERIMENT STATION VICKSBURG MS STRUCTURES LAB,...
The deterioration of brick in certain control house structures at five navigation locks was characterized by partial or complete separation of laminations from the face of several bricks. Some of the laminations had fallen completely off. Deteriorated and nondeteriorated samples were removed from several structures and were evaluated by physical testing and petrographic examination. The deterioration mechanism was identified as moisture intrusion accompanied by freezing and thawing. Six model...
Topics: DTIC Archive, Denson,Robert H, ARMY ENGINEER WATERWAYS EXPERIMENT STATION VICKSBURG MS STRUCTURES...
The deterioration of brick in certain control house structures at five navigation locks was characterized by partial or complete separation of laminations from the face of several bricks. Some of the laminations had fallen completely off. Deteriorated and nondeteriorated samples were removed from several structures and were evaluated by physical testing and petrographic examination. The deterioration mechanism was identified as moisture intrusion accompanied by freezing and thawing. Six model...
Topics: DTIC Archive, Denson,Robert H, ARMY ENGINEER WATERWAYS EXPERIMENT STATION VICKSBURG MS STRUCTURES...
Contents: Coring program; Petrographic report and core logs; Foundation and concrete properties; Stability analysis.
Topics: DTIC Archive, Pace,Carl E, ARMY ENGINEER WATERWAYS EXPERIMENT STATION VICKSBURG MS STRUCTURES LAB,...
In May 1978 the U.S. Army Engineer District, Detroit (NCE) requested the U.S. Army Engineer Waterways Experiment Station (WES) to participate in the organization and execution of a program to accomplish detailed testing to determine the condition of the Lake Superior Regulatory Structure and its foundation. WES helped to plan and direct a testing program that included nondestructive and microseismic tests, concrete core drilling, laboratory analysis of core samples, tests and analysis of the...
Topics: DTIC Archive, Thornton, Jr , Henry T, ARMY ENGINEER WATERWAYS EXPERIMENT STATION VICKSBURG MS...
The resistance to abrasion-erosion of several concretes made with different coarse aggregates, with and without silica fume as a mineral admixture, was evaluated, Testing was done in accordance with the Corps of Engineers standard test method. Initially, concretes made with a limestone coarse aggregate (available near the project site) and with two gabbros (from New York and Virginia) were prepared and tested. Although the gabbros were thought to be harder than the limestone, testing revealed...
Topics: DTIC Archive, Holland,Terence C, ARMY ENGINEER WATERWAYS EXPERIMENT STATION VICKSBURG MS STRUCTURES...
Concrete mixtures were evaluated to determine which were most suited for placement underwater in thin lifts. The concretes were proportioned to have good workability, good abrasion-erosion resistance, and good resistance to washing out of the cement paste. High-range water reducers (HRWR) were used to increase the workability and permit the use of low water-cement ratios (W/C) to increase the resistance to abrasion-erosion. Low W/C, silica fume, and antiwashout admixtures (AWA) were used to...
Topics: DTIC Archive, ARMY ENGINEER WATERWAYS EXPERIMENT STATION VICKSBURG MS STRUCTURES LAB, *CONCRETE,...
This report covers the specific strength design criteria and strength design procedures for inverted T-walls used as retaining walls or flood walls founded on earth or rock. Among the subjects covered are: applicable loads and forces; loading combinations; base reaction; design strength for reinforcement; distribution of flexural reinforcement; control of deflections; shrinkage and temperature reinforcement; concrete cover for reinforcement; details of reinforcement; maximum tension...
Topics: DTIC Archive, Liu,Tony C, ARMY ENGINEER WATERWAYS EXPERIMENT STATION VICKSBURG MS STRUCTURES LAB,...
This report describes the development of a three-dimensional elastic- viscoplastic work-hardening constitutive relationship for earth materials. The constitutive relationship is capable of reproducing the hysteretic behavior of the material under both hydrostatic and deviatoric states of stress; it also accounts for shear-induced volume change and the effect of superimposed hydrostatic stress on shearing response. The capability of the constitutive relationship for simulating the time-dependent...
Topics: DTIC Archive, Baladi, George Y., ARMY ENGINEER WATERWAYS EXPERIMENT STATION VICKSBURG MS STRUCTURES...
The Munition Assembly Complex, Building 12-64, located at Pantex, Tex., uses the separated bay concept to isolate adjacent bays from one another. Tests were conducted by the U.S. Army Engineer Waterways Experiment Station to investigate the possibility of an accidental explosion in one bay causing personnel injury in an adjacent bay, and to collect data that can be used to improve future designs of this type. Tests, simulating an accidental explosion were conducted in a full size donor with a...
Topics: DTIC Archive, Volz, Robert D, ARMY ENGINEER WATERWAYS EXPERIMENT STATION VICKSBURG MS STRUCTURES...
In November 1954, a long-term durability program was begun to determine the effects of severe natural weathering on reinforced concrete beams loaded to different stress levels and containing reinforcing steel with different types of bar deformation in either top-as-cast or bottom-as-cast positions. The beams were fabricated, cured, and loaded at the U.S. Army Engineer Waterways Experiment Station (WES) in 1954, then shipped to Eastport, Marine, and placed on the beach at the natural weathering...
Topics: DTIC Archive, Thornton,H T , Jr, ARMY ENGINEER WATERWAYS EXPERIMENT STATION VICKSBURG MS STRUCTURES...
The Panama Canal has in recent decades experienced increasingly heavier traffic volume and gross tonnage. These increased demands have contributed to serious structural deterioration of the tow track system used in the locks traffic was devised by Panama Canal Commission (PCC) engineers, and implementation was begun in 1981. Concern arose that the repaired tow track might not be resistant to continued deterioration. An evaluation of the structural integrity of the repaired track system was...
Topics: DTIC Archive, Cost,V T, ARMY ENGINEER WATERWAYS EXPERIMENT STATION VICKSBURG MS STRUCTURES LAB,...
The study presents the effect of rigid body motion on the single- degree-of-freedom (SDOF) model presently used for dynamic analyses of buried roof slabs. The effect of rigid body motion is incorporated by adding a second degree of freedom to the model. Relative displacements between the roof and the structure are given for comparison. The results indicate that at overpressures required to cause severe damage to a relatively hard, shallow buried structure, rigid body motion will have little...
Topics: DTIC Archive, Hall, Robert L, ARMY ENGINEER WATERWAYS EXPERIMENT STATION VICKSBURG MS STRUCTURES...
This report presents test results which describe materials and systems that can be used to protect buildings from floodwaters. Each year flooding causes more property damage in the United States than any other natural disaster. High flood damage costs to property have produced an awareness that nonstructural methods should be developed to augment flood protection provided by dams, levees, and similar structures. Because of the frequency and extent of flooding, strong initiatives to protect...
Topics: DTIC Archive, Pace, Carl E, ARMY ENGINEER WATERWAYS EXPERIMENT STATION VICKSBURG MS STRUCTURES LAB,...
A finite element (FE) code was developed to verify laboratory test results or to predict unavailable laboratory test data for porous media loaded to multikilobar stress levels. The FE code simulates quasi-static, axisymmetric, laboratory mechanical property tests, i.e., the laboratory tests are analyzed as boundary value problems. The code calculates strains, total and effective stresses, and pore fluid pressures for fully and partially saturated porous media. The time-dependent flow of the...
Topics: DTIC Archive, Akers, Stephen A, ARMY ENGINEER WATERWAYS EXPERIMENT STATION VICKSBURG MS STRUCTURES...
An investigation is described which was conducted to determine the processes and techniques required to produce portland-cement concrete with a compressive strength of 15,000 psi or greater using conventional concreting methods and equipment, and to develop physical property data on the mixtures. It was permitted that special materials and admixtures be used, but a requirement was set that the aggregates and cements be selected from those available in the Cheyenne, Wyoming, area. Results...
Topics: DTIC Archive, Saucier,K L, ARMY ENGINEER WATERWAYS EXPERIMENT STATION VICKSBURG MS STRUCTURES LAB,...
At the time this study was initiated, civil defense planning in the United States called for the evacuation of nonessential personnel to safe host areas when a nuclear attack is probable, requiring the construction of blasts shelters to protect the keyworkers remaining in the risk areas. The placement of shear stirrups in the one-way reinforced concrete roof slabs of the shelters will contribute significantly to project costs. Ten one-way reinforced concrete slabs were statically and uniformly...
Topics: DTIC Archive, Woodson, Stanley C, ARMY ENGINEER WATERWAYS EXPERIMENT STATION VICKSBURG MS...
Freshwater grouts are among the cement-based materials developed and studied at the US Army Engineer Waterways Experiment Station (WES) for sealing a radioactive waste repository in bedded evaporite rocks. The grout most studied was first developed for the Bell Canyon Tests(BCT) at the Waste Isolation Pilot Project (WIPP) in southeastern New Mexico. This salt-free grout, designated BCT-1FF, was placed in the field in 1981 (Site and Preliminary Design Validation, or SPDV) and again in 1983 (B-25...
Topics: DTIC Archive, Wakeley,Lillian D, ARMY ENGINEER WATERWAYS EXPERIMENT STATION VICKSBURG MS STRUCTURES...
Incremental elastic-plastic constitutive models which include both an ultimate failure envelope and a work-hardening yield surface, or cap, are commonly used in ground shock calculations to simulate geologic material behavior. The basic premise of elastic-plastic constitutive models is the assumption that certain materials are capable of undergoing small plastic (permanent) as well as elastic (recoverable) strains at each loading increment. This report describes the development of a...
Topics: DTIC Archive, Baladi,George Y, ARMY ENGINEER WATERWAYS EXPERIMENT STATION VICKSBURG MS STRUCTURES...
The DNA/WES Ground Motion Test Facility is a vertical gas gun with a 1.22-m diameter projectile. This report describes the selection of a material for use as a standardized granular target. A description of target construction and testing procedures is presented. Stress and velocity time-histories from three identical tests (i.e., identical targets and projectile velocities) are presented. Analyses of the data includes determination of the propagation velocity of the loading and relief waves in...
Topics: DTIC Archive, White, Howard G., ARMY ENGINEER WATERWAYS EXPERIMENT STATION VICKSBURG MS STRUCTURES...
In May 1978 the U.S. Army Engineer District, Detroit (NCE) requested the U.S. Army Engineer Waterways Experiment Station (WES) to participate in the organization and execution of a program to accomplish detailed testing to determine the condition of the Lake Superior Regulatory Structure and its foundation. WES helped to plan and direct a testing program that included nondestructive and microseismic tests, concrete core drilling, laboratory analysis of core samples, tests and analysis of the...
Topics: DTIC Archive, Thornton, Jr , Henry T, ARMY ENGINEER WATERWAYS EXPERIMENT STATION VICKSBURG MS...
The problem of upgrading one-way reinforced concrete (R/C) slab floor systems for keyworker shelters was studied in this program. The objective was to develop competent designs for upgrading such systems that would use readily available materials, be easy to construct, and increase the load-carrying capacities of such systems to 50 psi or greater. Two upgrading methods were developed and evaluated: a wooden post method and a steel beam method. For the wooden post method, several 4- by 4-inch...
Topics: DTIC Archive, McVay,Mark K, ARMY ENGINEER WATERWAYS EXPERIMENT STATION VICKSBURG MS STRUCTURES LAB,...
This project was a cooperative effort between the U.S. Army Engineer Waterways Experiment Station (WES) and the University of Illinois under a Cooperative Research and Development Agreement as part of the Construction Productivity Advancement Research Program. The purpose was to develop a portable radar system for nondestructive evaluation (NDE) of concrete. Two approaches, a time-domain pulse system and a frequency-domain system, were investigated. An ultra-wideband (UWB) time-domain pulse...
Topics: DTIC Archive, Chen, Fu-Chiarng, ARMY ENGINEER WATERWAYS EXPERIMENT STATION VICKSBURG MS STRUCTURES...
This report presents the results of laboratory and field dowel pullout tests and shear transfer tests. These tests were conducted to evaluate the pullout performance of dowels and the influence of dowel spacing on the load-carrying capacity of the replacement concrete cast during rehabilitation of vertical walls in navigation locks. The results of these tests and a review of the existing literature on the interface shear transfer and the dowel action mechanisms were the bases for the...
Topics: DTIC Archive, Liu,Tony C, ARMY ENGINEER WATERWAYS EXPERIMENT STATION VICKSBURG MS STRUCTURES LAB,...
Contents: Coring program; Petrographic report and core logs; Foundation and concrete properties; Stability analysis.
Topics: DTIC Archive, Pace,Carl E, ARMY ENGINEER WATERWAYS EXPERIMENT STATION VICKSBURG MS STRUCTURES LAB,...
Finite element computer analyses were performed for critical concrete sections of the Richard B. Russell Dam using as input several acceleration-time histories recommended by a panel of geologists and seismologists. Response spectra analyses were also performed using the Nuclear Regulatory Commission (NRC) Guide 1.60 design response spectra for a 0.25-g ground acceleration. Both complete time history response calculations and simplified approximate analyses are performed and their results...
Topics: DTIC Archive, Norman ,C Dean, ARMY ENGINEER WATERWAYS EXPERIMENT STATION VICKSBURG MS STRUCTURES...
The deterioration of brick in certain control house structures at five navigation locks was characterized by partial or complete separation of laminations from the face of several bricks. Some of the laminations had fallen completely off. Deteriorated and nondeteriorated samples were removed from several structures and were evaluated by physical testing and petrographic examination. The deterioration mechanism was identified as moisture intrusion accompanied by freezing and thawing. Six model...
Topics: DTIC Archive, Denson,Robert H, ARMY ENGINEER WATERWAYS EXPERIMENT STATION VICKSBURG MS STRUCTURES...
A study was begun in 1950 to determine the effects of severe natural weathering on stressed, reinforced concrete beams of various compositions and degrees of stress. The objectives of the study were to obtain information on the long-term weathering of air-entrained and nonair-entrained concrete beams containing steel of different compositions and types of deformation and having different levels of stress in the steel that would cause varying degrees of cracking of the concrete. (Author)
Topics: DTIC Archive, O'Neil,Edward F, ARMY ENGINEER WATERWAYS EXPERIMENT STATION VICKSBURG MS STRUCTURES...