Civil Engineering Association

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The Author and The Book

Third Edition
Reprint January 2002

Professor Edward L. Wilson has over forty-five years of professional experience in Civil, Mechanical and Aerospace Engineering. He was a Professor of Structural Engineering at the University of California at Berkeley during the period 1965 to 1991 and has published over 180 papers and books. His research and development contributions have earned him many awards including the election to the National Academy of Engineering in 1985.

Professor Wilson wrote the first automated finite element analysis computer program in 1961 and was the original developer of the CAL, SAP and ETABS series of computer programs. These programs are noted for their accuracy, speed, use of very efficient numerical algorithms and accurate finite elements. During the past ten years, Ed Wilson has worked as a Senior Consultant to CSI on the programming and documentation of these new methods of computational structural analysis.

The major purpose of this book is to summarize the theoretical development of the finite elements and numerical methods used in the latest versions of the SAP and ETABS programs. Most of the elements and numerical methods used in these programs are new and are not presented in current textbooks on structural analysis. In addition, the book summarizes the fundamental equations of mechanics.

A minimum mathematical background is required in order to completely understand the material presented in the book. However, an understanding of the physical behavior of real structures is essential. A computer programming background is not required.

A new three-dimensional quadrilateral SHELL element, with normal rotational degrees-of-freedom, is presented that is accurate for both thin and thick plates and shells. Therefore, shell elements can be easily connected to classical FRAME elements. The three-dimensional SOLID element can be used to model both fluids and solids.

Dynamic analysis is presented as a logical extension of static analysis in which inertia and damping forces are added to satisfy equilibrium at every point in time. The use of Load Dependent Ritz, LDR, vectors in a dynamic analysis produce far more accurate results than if the exact dynamic eigenvectors are used.

The use of LDR vectors allows the classical mode superposition method to be extended to nonlinear dynamic analysis by the use of the Fast Nonlinear Analysis, FNA, method. This new method of nonlinear, dynamic analysis allows structures, with a limited number of nonlinear elements, to be analyzed with almost the same computational time as required for a linear dynamic analysis of the same structure.

This is a “must read” book for all researchers and professionals working in the field of modern structural engineering



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By Edward L Wilson

* Publisher: Computers and Structures
* Number Of Pages:
* Publication Date: 1999
* ISBN-10 / ASIN: 0923907009
* ISBN-13 / EAN: 9780923907006

This edition of the book contains corrections and additions to the July 1998 edition. Most of the new material that has been added is in response to questions and comments from the users of SAP2000, ETABS and SAFE.

Chapter 22 has been written on the direct use of absolute earthquake displacement loading acting at the base of the structure. Several new types of numerical errors, for absolute displacement loading, are identified. First, the fundamental nature of displacement loading is significantly different from the base acceleration loading traditionally used in earthquake engineering. Second, a smaller integration time step is required to define the earthquake displacement and to solve the dynamic equilibrium equations. Third, a large number of modes are required for absolute displacement loading in order to obtain the same accuracy as produced when base acceleration is used as the loading. Fourth, the 90 percent mass participation rule, intended to assure accuracy of the analysis, does not apply for absolute displacement loading. Finally, the effective modal damping for displacement loading is larger than when acceleration loading is used.

In order to reduce theses errors associated with displacement loading a higher order integration method, based on a cubic variation of loads within a time step, is introduced in Chapter 13. In addition, static and dynamic participation factors have been defined which allow the structural engineer to minimize the errors associated with displacement type of loading. In addition, Chapter 19 on viscous damping has been expanded in order to illustrate the physical effects of modal damping on the results of a dynamic analysis.

Appendix H, on the speed of modern personal computers, has been updated. It is now possible to purchase a personal computer for approximately $1,500 that is 25 times faster than a $10,000,000 CRAY computer produced in 1974.





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I found this cover and Table of Contents, I'm not sure if it's the same book:





Chapter 1. Material Properties - click and wait to download an Adobe file

Chapter 2. Equilibrium and Compatibility

Chapter 3. Energy and Work ....

Chapter 14 Calculation of Stiffness and Mass Orthogonal Vectors

Chapter 18 The Fast Nonlinear Analysis Method

Chapter 20 Dynamic Analysis by Direct Integration

Chapter 23 Fluid-Structure Interaction

Chapter 24 Natural Eigenvalues

Three-Dimensional Static and Dynamic Analysis of Structures by Edward L. Wilson (3.20 MB)

just another download links, it's available since CSI release SAP2000 version 8.


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Mirror Links:

Bookmark PDF|RAR 3.27|2.65 MB

Mirror Links:

PDF|RAR 3.27|2.65 MB

Ed Wilson has update several chapters for this book, you can download pdf for this book free in here :

This book represents more than four decades of research and teaching experience and describes in a physical and practical manner many of the techniques used in the software products developed by Computers and Structures, Inc. It provides the background an engineer needs to successfully utilize these programs. In the author’s own words, “the major purpose of this book is to present the essential theoretical background so that the users of computer programs for structural analysis can understand the basic approximations used with the program, verify the results of all analyses and assume professional responsibility for the results.” At over 400 pages, this hardcover book beautifully illuminates topics important to the practicing engineer doing computer analysis, covering subjects such as Equilibrium and Compatibility, Isoparametric Finite Elements, Shell Elements, Boundary Conditions, Dynamic Analysis, Linear Viscous Damping, Fast Nonlinear Analysis and Seismic Analysis using Displacement Loadings, and many others. With its concise explanatory style, numerous illustrations, and physical approach to explaining underlying mathematical formulations, this book will be a valued addition to the library of any engineer.