Load-resisting mechanisms of 3D composite floor systems under internal column-removal scenario

被引：51

作者：

Fu, Qiu Ni ^{[1
]}

Tan, Kang Hai ^{[1
]}

Zhou, Xu Hong ^{[2
,3
]}

Yang, Bo ^{[2
,3
]}

机构：

[1] Nanyang Technol Univ, Sch Civil & Environm Engn, 50 Nanyang Ave, Singapore, Singapore

[2] Chongqing Univ, Minist Educ, Key Lab New Technol Construct Cities Mt Area, Chongqing 400045, Peoples R China

[3] Chongqing Univ, Sch Civil Engn, Chongqing 400045, Peoples R China

来源：

ENGINEERING STRUCTURES | 2017年 / 148卷

基金：

国家重点研发计划; 中国国家自然科学基金;

关键词：

Progressive collapse; Column removal; Composite floor system; Experimental study; Catenary action; Tensile membrane action; PROGRESSIVE COLLAPSE; STEEL; CONNECTIONS; BUILDINGS; CONCRETE;

D O I：

10.1016/j.engstruct.2017.06.070

中图分类号：

TU [建筑科学];

学科分类号：

0813 ;

摘要：

To elucidate the load-resisting mechanisms of three-dimensional steel-frame-composite-floor systems (3D composite floor systems) under internal column removal scenario, such as tensile membrane action and catenary action, a large-scale experimental test was conducted. A two-by-two bay specimen was tested quasi-statically to failure by using a special loading and restraint system. The test specimen was scaled down from a prototype structure to a 1/3 model due to laboratory space constraint. Based on this test, the load-deflection response of the 3D composite floor subjected to internal column loss is obtained. Besides, the peak load-carrying and deformation capacities are obtained and the failure modes are discussed in detail. Stress states and deformation of the floor components including steel beams and decking are also presented. To gain deeper insight into the load-resisting mechanisms, the respective contributions of individual floor system components are separated, which include the double-span girder, double-span secondary beam and composite slabs. Finally, the vertical load redistribution among surrounding columns is evaluated to find the load transfer path at large deformation stage. (C) 2017 Elsevier Ltd. All rights reserved.

引用

页码：357 / 372

页数：16

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