Abstract
The guidelines of Unified Facilities Criteria (UFC) and U. S. General Service Administration (GSA) provide the design requirements to reduce the potential of progressive collapse for structures. According to these codes, progressive collapses are occurred due to loss of a main vertical structural element. In this study, the vulnerability of an official 10-story steel moment resistant frame, designed according to Iranian National Building Codes (INBC) is assessed. The following nonlinear dynamic analysis procedure is recommended by the UFC 4-023-03 guideline, which provides technical guidance for mitigation and protection of progressive collapse. Alternate Path (AP) method has been applied to evaluate the structure that can bridge over notionally removed column and nonlinear dynamic analysis procedure conducted. The investigated cases emphasize on the removal of a corner column in the ground floor, fifth floor, eighth floor, and just below the roof floor. Based on the results obtained in this research, steel moment resistant frames, designed according to Iranian National Building Codes, do not satisfy UFC acceptance criteria and have high potential for progressive collapse in corner column removal scenarios. Therefore some modifications have been conducted on the codes to satisfy the UFC limits.
Highlights
A structure collapses progressively when one of its vital members fails causing the failure and damage of adjoining elements
He found that the progressive collapse resistance of the buildings subjected to column loss increase notably by wing-type walls and the deformation capacity decreases by exterior non-structural walls
In the alternative load path method, the Unified Facilities Criteria (UFC) guidelines refer to several cases for removing the structural elements and analyze the structure subjected to progressive collapse
Summary
A structure collapses progressively when one of its vital members fails causing the failure and damage of adjoining elements. The effective measures are considered to evaluate progressive collapse vulnerability of structures For this purpose an official 10-story steel moment resistant frame with specific administrative application designed according to Iranian National Building Codes and with a focus on requirements of Iranian Seismic Code No 2800 for satisfying UFC regulations. The most important researches, conducted on the case, are as follows: Tsai and Huang[3] have investigated the effects of three types of exterior infill walls on the performance and response of a reinforced concrete building subjected to some column removal He found that the progressive collapse resistance of the buildings subjected to column loss increase notably by wing-type walls and the deformation capacity decreases by exterior non-structural walls. Kim and Kim[11] investigated the resistance capacity of steel frames for progressive collapse using AP methods based on UFC and GSA guidelines They compared nonlinear dynamic analysis with linear static procedure. Helmy et al.[12] evaluated the resistance capacity of a 10-story typical RC framed slab structure, designed based on ACI 318-08 provisions, for progressive collapse concerning the removal of wall and column
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