Behavior of geosynthetic reinforced soil walls with poor quality backfills on yielding foundations
Author: Saidin Fadzilah | Size: 20 MB | Format:PDF | Quality:Unspecified | Publisher: University of Washington | Year: 2007
This thesis is a study of the behavior of GRS walls with poor quality backfill on yielding foundations with the goal of contributing towards a rational design of these walls. The research consisted of numerical simulation of a GRS wall constructed using poor quality backfill on a compressible foundation. The results were compared to an equivalent full scale instrumented wall. Parametric analyses were performed to study the effect of varying some important parameters on the wall response. The impact of water was studied by modeling the effect of a wetting front advancing into the fill due to infiltration of water through a two-phase flow analysis. Findings from this research show that GRS walls using poor quality backfills on a yielding foundation can be designed using current methods used for granular backfills but adequate provision for drainage is critical. A reinforced base is essential to spread the load onto the yielding foundation. Permeable reinforcements are not effective in reducing the generation of excess pore pressure due to infiltration for backfills compacted dry of optimum.
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ASTM D5777 - 00(2011)e1
Standard Guide for Using the Seismic Refraction Method for Subsurface Investigation
Published : January 2011
This guide summarizes the equipment, field procedures, and interpretation methods used for the determination of the depth, thickness and the seismic velocity of subsurface soil and rock or engineered materials, using the seismic refraction method.
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Computational Mechanics in Structural Engineering : Recent Developments and Future Trends
Author: Franklin Y. Cheng, Zizhi Fu | Size: 12.5 MB | Format:PDF | Quality:Scanner | Publisher: Taylor & Francis | Year: 1991 | pages: 480 | ISBN: 1851668675, 9781851668670
Proceedings of Sino-US Joint Symposium/Workshop on Recent Developments and Future Trends of Computational Mechanics in Structural Engineering, Beijing, China, September 24-28 1991
Table of Contents :
Preface
Opening Remarks p. 1
Resolutions p. 6
Symposium/Workshop Activities p. 6
General Papers
NSF Programs in Computational and Structural Mechanics p. 10
Funding Programs of the Computational Mechanics by National Natural Science Foundation of China (NSFC) p. 27
Partial Differential Equations and Hamiltonian System p. 32
Generalized Optimal Active Control Algorithm of Seismic Structures and Related Soil-Structure Formulation p. 49
Failure Analysis and Finite Elements
Nonlinear Finite Element Algorithms for Massively Parallel SIMD Computers p. 63
Spline Finite Element Method - Recent Developments p. 77
The Ritz-Lanczos Algorithm in Structural Dynamic Analysis p. 91
Rigid Body Criteria in Nonlinear Element Formulation p. 101
Shells and Walls
Shells: Mechanics and Approximation - Linear and Nonlinear Aspects p. 114
Statics, Dynamics and Stability of Shell Structures p. 128
Research on Unreinforced Hollow Clay Tile Walls and Developments of Computational Mechanics p. 140
The Analysis of the Environments and Structures Interaction - Soil-Plate and Shell Interaction p. 154
Structural Control
Active Structural Control for Natural Hazard Mitigation p. 168
Study on Structural Control p. 179
Control of Coupled Bending and Torsional Vibration and Motion of Beams with Shear Effect p. 193
Effects of Flexible Foundation on the Responses of Active Controlled Structures p. 205
Active Control of Base Isolated Structures p. 219
Computational Strategies for Buildings
Substructured Computer-Actuator Hybrid Analysis for Inelastic Earthquake Response of Structures p. 232
Recent Development of 3-Dimensional Analysis of Tall Building Structures by Continuum Method p. 246
Nonlinear Analysis
Nonlinear Modelling and Analysis of Reinforced Concrete Frame Structures p. 260
Mechanical Properties of Plastic Concrete and Nonlinear Structural Analyses of Plastic Concrete Cut-off Wall p. 273
Analyses of Tall Building Structures by the Method of Analytic ODE Solver p. 286
Nonlinear and Postbuckling Analysis of Elastic Frames p. 300
Structural Optimization
Optimum Structural Design under Uncertainties and Imprecisions p. 314
Optimum Earthquake Resistant Design of Plane Frame Structures with Elasto-Plastic Beam p. 326
New System of Earthquake Resistant Structures in Seismic Zone p. 343
Observational Construction Control System for Soil Structures by Computer Network p. 357
Minimum Search for Lagrange Multiplier Method in Constrained Optimization Problems p. 371
Structural Reliability
Computational Damage Analysis and Reliability Assessment p. 381
Dynamic Behavior of Bridges under Random Loading and Dynamic Reliability Problem p. 398
Fuzzy Random Analysis and Design of Engineering Structures p. 412
Supercomputer, CAD and Expert System
Supercomputer Applications p. 423
Some Aspects of R.C. Structure CAD System p. 439
Fuzzy Reasoning and Machine Learning of Expert System for Structural Design p. 450
Index of Contributors p. 465
Table of Contents provided by Blackwell. All Rights Reserved.
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This volume contains forty of the papers presented at the International Conference on 'Mathematics in Transport Planning and Control' which was held at Cardiff University from 1-3 April, 1998. This was the third such conference run under the auspices of the Institute of Mathematics and Its Applications, the first being held at the University of Surrey in 1979, and the second at Cardiff University in 1989. Over fifty papers were submitted for presentation at the conference. It will be clear from the contents that mathematical ideas and methodologies continue to play a prominent part in the description and solution of the many and varied problems that are being currently investigated in quite diverse areas of transport research. Applications will be found on transport planning, congestion, assignment, networks, signalling, road safety, and environmental issues.
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This volume contains selected peer-reviewed papers presented at the IMA 4th International Conference on Mathematics in Transport. These papers deal with the development and application of mathematical and statistical modelling in transport and present research on the mathematical ideas and methodologies required to cope with the increasing demand on transport infrastructure. Authorship is international and a wide variety of topics are covered including public transport and scheduling, pricing issues, travel behaviour and choice modelling, safety and spatial and location modelling. It has an international perspective with authors representing many countries and covering a variety of topics.
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PROBABILITY AND STATISTICS FOR ENGINEERS AND SCIENTISTS, Fourth Edition, continues the approach that has made previous editions successful. As a teacher and researcher at a premier engineering school, author Tony Hayter is in touch with engineers daily--and understands their vocabulary. The result of this familiarity with the professional community is a clear and readable writing style that readers understand and appreciate, as well as high-interest, relevant examples and data sets that hold readers' attention. A flexible approach to the use of computer tools includes tips for using various software packages as well as computer output (using MINITAB and other programs) that offers practice in interpreting output. Extensive use of examples and data sets illustrates the importance of statistical data collection and analysis for students in a variety of engineering areas as well as for students in physics, chemistry, computing, biology, management, and mathematics.
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Dear all, i need theses from Washington University
1. Behavior of geosynthetic reinforced soil walls with poor quality backfills on yielding foundations Saidin Fadzilah (2007)
2. Deformation prediction of geosynthetic reinforced soil retaining walls Boyle, Stanley R (1995)
3. Internal stability analyses of geosynthetic reinforced retaining walls Lee, Wei F (2000)
Modal combination method for earthquake-resistant design of tall structures to multidimensional excitations
Author: HONG-NAN LI, LI SUN1 AND GANGBING SONG | Size: 336 KB | Format:PDF | Quality:Unspecified | Publisher: HONG-NAN LI, LI SUN1 AND GANGBING SONG | Year: 2004 | pages: 19
This paper presents a modal combination method for earthquake-resistant design of structures to multidimensional
seismic excitations. With the assumption that an earthquake is a stationary random vibration, the correlation
among the input components is considered in the proposed method. The relationship coefficients between
the translational component and rotational component is then derived in the frequency domain. The combination
method of response spectrum for structural response to multidimensional earthquakes is proposed based on
the random vibration theory. With the help of the derived modal correlation coefficients, the formulation for
structural response to the two-dimensional earthquake excitations can be obtained. Numerical examples
demonstrate the effectiveness and high precision of the proposed methods.
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Implications of vertical mass modeling errors on 2D dynamic structural analysis
Author: TIMOTHY M. WHALEN, GRAHAM C. ARCHER AND KISHOR M. BHATIA | Size: 520 KB | Format:PDF | Quality:Unspecified | Publisher: TIMOTHY M. WHALEN, GRAHAM C. ARCHER AND KISHOR M. BHATIA | Year: 2004 | pages: 10
The use of diagonal (lumped) mass matrices is common in dynamic structural analysis. The assumptions made
when performing the lumping procedure, however, are not always consistent with the underlying physical behavior
and can therefore modify the dynamic properties of the modeled structure. The influence of errors in mass
modeling for vertical degrees of freedom on dynamic behavior and seismic response is illustrated. We demonstrate
that overestimation of the lumped masses associated with vertical displacements in 2D frame models of
these structures leads to inaccurate modal periods and associated modal participation factors for dynamic response.
The ramifications of these inaccuracies on seismic response are shown and implications in other dynamic analysis
situations are discussed.
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Dynamic analyses were carried out to study the seismic response of high-rise steel moment-resisting frames in
16-storey buildings. The frames are intentionally designed using three different design procedures: strengthcontrolled
design, strong column–weak beam controlled design, and drift-controlled design. The seismic performances
of the so-designed frames with vertical mass irregularities were discussed in view of drift ratio, plastic
hinge rotation, hysteretic energy input and stress demand. A demand curve of hysteretic energy inputs was also
presented with two earthquake levels in peak ground accelerations for a future design application.
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