|Table of Contents|

Progressive Collapse Mechanism of Precast Concrete Structures Assembled with Mechanical Couplers(PDF)

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

Issue:
2022年05期
Page:
32-40
Research Field:
结构工程
Publishing date:

Info

Title:
Progressive Collapse Mechanism of Precast Concrete Structures Assembled with Mechanical Couplers
Author(s):
TAN Guang-wei1;  HU Shu-jun2;  HUANG Hua3;  QIN You-zhe4;  QIAN Kai5
(1. Zhongmei Engineering Group Ltd., Nanchang 330001, Jiangxi, China; 2. School of Infrastructure Engineering, Nanchang University, Nanchang 330031, Jiangxi, China; 3. School of Civil Engineering, Chang'an University, Xi'an 710061, Shaanxi, China; 4. Guangxi Construction Engineering Track Assembly Construction Industry Co., Ltd, Liuzhou 545000, Guangxi, China; 5. Guangxi Key Laboratory of New Energy and Building Energy Saving, Guilin University of Technology, Guilin 541004, Guangxi, China)
Keywords:
precast concrete;  mechanical coupler;  progressive collapse;  experimental study;  finite element analysis
PACS:
TU375.4
DOI:
10.19815/j.jace.2022.08007
Abstract:
In order to study the progressive collapse resistance of precast concrete(PC)structures assembled with mechanical couplers, two 1/2 scaled PC substructures were tested. The failure modes, vertical resistance-displacement curves, horizontal reaction-displacement curves and beam deflection curves of PC substructures were obtained. A refined finite element model was established by finite element software LS-DYNA, and numerical analysis was carried out. The results show that the substructure damage is mainly concentrated in the beam end, and the beam end damage near the middle column is more serious than that near the side column. There is no obvious damage in the beam-column joint area. The final failure of the specimen is controlled by the fracture of the longitudinal reinforcement at the beam ends on both sides of the middle column. The mechanical couplers can ensure the continuity of the reinforcement at the bottom of the beam. The substructure mainly transmits the load through the shear force and axial tension of the beam section in the arch stage and the suspension stage. Increasing the diameter of reinforcement can significantly improve the first peak bearing capacity and ultimate bearing capacity of substructure. The compressive strength of concrete has little effect on the bearing capacity of PC substructure assembled with mechanical couplers, but increasing the strength of concrete will increase the bonding stress between concrete and reinforcement, resulting in earlier fracture of the longitudinal reinforcement.

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Last Update: 2022-09-30