|Table of Contents|

Study on progressive collapse resistance of prefabricated beam-column substructures with hybrid steel-concrete connection(PDF)

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

Issue:
2025年03期
Page:
80-91
Research Field:
建筑结构
Publishing date:

Info

Title:
Study on progressive collapse resistance of prefabricated beam-column substructures with hybrid steel-concrete connection
Author(s):
TAN Guangwei1;  LIU Zhongcun1;  HUANG Hua2;  FENG Decheng3;  ZHANG hailin4;  PAN Xianlin5;  LIU Wei6;  LIU Yansheng4;  QIAN Kai1; 7
Keywords:
hybrid steel-concrete connection;  assembled structure;  Pushdown method;  finite element analysis;  progressive collapse resistance
PACS:
TU398.4
DOI:
10.19815/j.jace.2023.09002
Abstract:
In order to study the progressive collapse resistance of prefabricated beam-column substructures with hybrid steel-concrete connection(HSCC), three 1/2 scale beam-column substructure specimens were designed and fabricated, including one cast-in-place reinforced concrete specimen and two precast concrete(PC)specimens with HSCC, and a pseudo-static Pushdown load test was carried out. Based on ANSYS/LS-DYNA, finite element simulation and parametric analysis were carried out to further study the influence law of connection parameters on the progressive collapse resistance performance of the structures. The results show that the failure of the cast-in-place specimens is dominated by the fracture of beam tensile reinforcement. The failure of PC specimens is mainly controlled by the shear fracture or slippage of bolts at the side column-beam end connection. The flush end plate hybrid connection(HSCC-FEP)specimen has the highest initial peak load, but the catenary action is not fully developed due to the slippery teeth of the bolts. The top-bottom web angle connection(HSCC-TSWA)specimen significantly improves the tensile capacity through the shear effect of the top-bottom web angle and bolts, which can effectively develop the catenary action to obtain a higher ultimate load capacity. Increasing the screw strength can change the damage mode from bolt shear to beam longitudinal reinforcement fracture, which significantly enhances the deformation capacity of the substructure and promotes the development of the catenary action. Reducing the span-to-height ratio is conducive to the development of the compression arch action at the stage of small deformation, but can significantly reduce the structural ductility. The deformation capacity is optimal when the pre-tightening force is at the rated torque. Excessive pre-tightening force will inhibit the deformation capacity of the structure, which is not conducive to the catenary action development.

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Last Update: 2025-06-01