|Table of Contents|

Experimental Study on Progressive Collapse Resistance of 3D Steel Frame-composite Floor Substructures with Different Connection Types(PDF)

《建筑科学与工程学报》[ISSN:1673-2049/CN:61-1442/TU]

Issue:
2022年03期
Page:
75-83
Research Field:
Publishing date:

Info

Title:
Experimental Study on Progressive Collapse Resistance of 3D Steel Frame-composite Floor Substructures with Different Connection Types
Author(s):
REN Lu-ming1; 2;  YANG Bo1; 2;  KONG De-yang3
(1. Key Laboratory of New Technology for Construction of Cities in Mountain Area of Ministry of Education, Chongqing University, Chongqing 400045, China; 2. School of Civil Engineering, Chongqing University, Chongqing 400045, China; 3. Department of Civil and Environmental Engineering, National University of Singapore, Singapore 117576, Singapore)
Keywords:
progressive collapse;  steel frame-composite floor substructure;  connection type;  experimental study;  load-resisting mechanism
PACS:
TU398
DOI:
10.19815/j.jace.2021.08083
Abstract:
To investigate the progressive collapse resistance of three-dimensional steel frame-composite floor structures, pseudo-static tests were carried out on four 1/3 down-scaled composite floor specimens with different connections under external column removal scenarios. The girder-to-column connections adopted flush-end-plate(FEP)connections, reverse channel(RC)connections, reduced beam section(RBS)connections and welded unreinforced flange-bolted web(WUFB)connections, while the girder-to-column and beam-to-girder connections employed double angle-cleat(DAC)connections and fin plate(FP)connections. The displacement-controlled uniform loading was applied by the specially designed 6-point loading system, and the load-displacement responses during the whole loading process and the failure modes of 3D composite floor systems were obtained. The influences offlexural action(FA), catenary action(CA)and tensile membrane action(TMA)on progressive collapse resistance were analyzed. The results demonstrate that, in terms of girder-to-column connections, the specimen with WUFB connections shows higher initial stiffness and load-carrying capacity, while the specimen with RC connections shows better ductility, and specimen with RBS connections has the best energy absorption capacity during the failure process. In terms of girder-to-column and beam-to-girder connections, the specimen with FP connections shows obvious brittle failure characteristics, while the other specimens employed DAC connections fail in a ductile way. FA plays a leading role in progressive collapse resistance under the external column failure, while TMA plays a certain role at large deformation stage. The contribution of CA is small and negligible.

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Last Update: 2022-05-30