Engelhardt, Michael D.; Popov, Egor P. - Behavior of Long Links in Eccentrically Braced Frames
Author: Engelhardt, Michael D.; Popov, Egor P. | Size: 59.6 MB | Format:PDF | Quality:Scanner | Publisher: UNIVERSITY OF CALIFORNIA AT BERKELEY | Year: 1989 | pages: 414
This report describes an experimental investigation and associated studies on the behavior of long, flexural yielding links in seismic-resistant Eaentrically Braced Frames (EBFs). EBFs provide ductile behavior under severe earthquake loads by restricting yielding to beam segments called "links". Short, shear yielding links are preferred because of their demonstrated excellent plastic rotation and energy dissipation capacities. Longer, flexural yielding links, however, can offer important architectural advantages and have been used on a number of recently constructed EBFs. Little experimental data has been available on the behavior of long links under cyclic loading.
The central focus of this report is an experimental investigation on fourteen 213 scale subassemblages subject to cyclic loads. The subassemblages model a portion of a single-diagonal EBF with the rinks attached to the columns. 'The testing program showed that the dominant failure mode for long links attached to columns is fracture of the link flange at the link-to-column connection. Rased on this experimental program, the recommendation is made that long links attached to columns not be used in EBFs. The test results suggest, however, that long links located between two braces can provide acceptable perfamance, although short Iinks are still preferred for best overall performance.
Because of the very high axial force and bending moment typically carried by the beam segment outside of the link, this member can buckle before link inelastic rotation is fullydeveloped, with a consequent loss in the overall system perfomance. Problems with the beam can be avoided by adhering to capacity design principles. A preliminary design procedure based on capacity design concepts is developed for the beams and braces of an EBF.
Based on the findings of this investigation, combined with the results of previous EBF research, preliminary design recommendations are provided for the use of long links not attaclled to columns. Included are recommendations on the design yield strength, ultimate strength, plastic rotation capacity and stiffening requirements for long links. The testing program has also demonstrated the suitability of selected brace-to-link connection details for use in EBFs with long or short links.
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and a version of 127MB
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ASCE/EPRI (1989). Civil Engineering Guidelines for Planning and Designing Hydroelectric Developments, Vol.4 Small Scale Hydro, 332 pages.
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The present work mat be considered as an introductory text in nonlinear functional analysis and its applications, even though not many of the results proved in the book depend on the full apparatus of infinite-dimensional normed linear spaces.
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The Atlas of Stress-Strain Curves, Second Edition is substantially bigger—in page dimensions, number of pages, and total number of curves—and better than the previous edition. It contains over 1400 curves, almost three times as many as in the 1987 edition. The curves are normalized in appearance to aid making comparisons among materials. All diagrams include metric (SI) units, and many also include U.S. customary units. All curves are captioned in a consistent format with valuable information including (as available) standard designation, the primary source of the curve, mechanical properties (including hardening exponent and strength coefficient), condition of sample, strain rate, test temperature, and alloy composition. Curve types include monotonic and cyclic stress-strain, isochronous stress-strain, and tangent modulus. Curves are logically arranged and indexed for fast retrieval of information. The book also includes an introduction that provides background information on methods of stress-stain determination, on data presentation and analysis, and on application of the results.
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Hi friends
Please if you can share this document Structural design of steel bins for bulk solids Author: Trahair, N. S., Abel, A., Ansourian, P., Irvine, H. M. and Rotter, J. M.
Publisher: Australian Steel Institute
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The programmer’s manual for ANSYS provides information about the various programming interfaces available to customers. This manual assumes that you have at least a basic knowledge of progmming ( a working knowledge of Fortran 90 would be very helpful).
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Perfect for power users, this practical resource reveals how to maximize the features and functionality of Excel 2007. You'll get in-depth details on Excel VBA programming and application development followed by 21 real-world projects--complete with source code--that show you how to set up specific subroutines and functions. The book then explains how to include the subroutines in the Excel menu system and transform a set of interrelated VBA macros into an Excel add-in package. Create your own Excel 2007 VBA macros right away with help from this hands-on guide.
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This handbook will serve as a guide for those interested in or concerned with the construction and inspection of reinforced grouted brick masonry as developed and practiced in southern California for over 70 years.
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