THE DESIGN AND CONSTRUCTION OF CONCRETE-FILLED STEEL TUBE COLUMN FRAMES
Author: Stephen P. SCHNEIDER1, Donald R. KRAMER2 and Douglas L. SARKKINEN3 | Size: 768 KB | Format:PDF | Quality:Original preprint | Publisher: 13th World Conference on Earthquake Engineering | Year: 2004 | pages: 12
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13th World Conference on Earthquake Engineering
Vancouver, B.C., Canada
August 1-6, 2004
Paper No. 252
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This paper presents finite-element FE modeling and nonlinear analysis of steel-concrete composite frames subjected to very
large cyclic loading. A three-dimensional FE model is developed to carry out the nonlinear analysis. Modeling details of the steel frame,
the reinforced concrete RC slab, the interactions between the RC slab and the frame beams, and the associated constitutive relationships
for cyclic loading are presented. A composite frame previously tested by the writers is analyzed using the proposed FE model. Good
correlation is observed between the experimental and analytical hysteresis curves up to rotation amplitude of 0.04 rad. One of the notable
observations during the loading to large rotations is the fracture at steel beam ends. To simulate such behavior, a simplified fractured steel
connection model is introduced. The proposed nonlinear model is found to be capable of capturing the fracture behavior of beam ends to
an acceptable accuracy.
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User Guide for the: International Building Code in the Emirate of Abu Dhabi Version 1, Edition 2011
Size: 6.4 MB | Format:PDF | Quality:Original preprint | Publisher: Emirate of Abu DhabiDepartment of Municipal Affairs | Year: January 2011 | pages: 348
This Abu Dhabi Building Codes Guide, is designed to meet theneeds of the community through code regulations thatsafeguard the public health and safety in all communities, largeand small.
This locally developed Code Guide, used in conjunction with the adopted building codes, establishes minimum regulations for prescriptive and performance-related provisions as they apply to the Emirate of Abu Dhabi. It is founded on broad-based principles that make possible the use of new materials,building designs and methods of construction. This Code Guide is fully compatible with all the adopted model International Codes ® (I-Codes ®) as published by the International Code Council (ICC) ®
The provisions within this Code Guide, have been reviewed and customized for local conditions through the efforts of work groups composed of fire safety, structural, architectural, civil and mechanical/plumbing professionals and other stake holders that reviewed the performance and prescriptive code requirements found in the adopted codes.
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Since we are a huge community of structural engineers, each with a goal of helping the others out, I was wondering if we all could collaborate and share typical structural details and create a library of sorts?
I know a lot of large engineering firms have typical details for improved efficiency of projects and standardization of details company-wide.
Would appreciate your thoughts/suggestions/contributions.
Establishes the basic principles that should be adopted when setting up national standards, regulations and recommendations for the deformation of buildings at the limit states of serviceability. Refers to the deformations at the serviceability limit states of buildings such as dwellings, offices, public buildings, and factories. Does not refer to the deformations of bridges, roads, masts, underground works, non-residential farm buildings, or special-purpose buildings such as atomic power stations or industrial plant.
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Comparison of Methods for Computing Equivalent Viscous Damping Ratios
of Structures with Added Viscous Damping
Journal of Structural Engineering / Volume 134 / Issue 1
Submitted 22 February 2005; accepted 13 April 2006
Authors : Finley A. Charney, Ph.D., P.E.1 and Robert J. McNamara, S.E.2
Abstract:
Three analysis methods are compared for determining the equivalent viscous damping ratios in a simple one-story, one-bay system with three different added damping configurations. The analysis methods are modal strain energy using the undamped mode shapes, free vibration log decrement, and complex eigenvalue-eigenvector analysis. The damping configurations include a diagonal configuration, a horizontal configuration, and a toggle-braced system. For each of these systems, a variety of linkage stiffness and damper capacities are considered. In all cases the structure, exclusive of the dampers, is assumed to remain elastic. A brief discussion is provided for the behavior of systems with nonlinear viscous dampers. The results of the study show that significantly different values may be obtained for the effective viscous damping in the same system when different analysis approaches are used. For the toggle-braced system with relatively flexible linkages, it was shown that the modal strain energy approach consistently produced increasing effective damping with increased damper capacity, while the other two methods indicated the opposite results. Subsequent analysis of the toggle-braced structure using the complex eigenvalue-eigenvector approach showed that the effective system damping was indeed decreasing with an increased device damping constant, and that the behavior could be attributed to the axial flexibility of the toggle brace linkage. The analysis indicated that the greater the flexibility of the linkage relative to the damping constant of the device, the greater the phase difference between the deformational velocity in the device and the relative horizontal velocity of the story containing the device. While the phase shift is evident from response history analysis, the most efficient visualization tool is a plot of the damped mode shapes on a complex plane.
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