|Table of Contents|

Experimental Research and Theoretical Analysis on Progressive Collapse Resistance of Prestressed Fabricated PC Frame with Removal of Side Columns(PDF)

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

Issue:
2022年03期
Page:
64-74
Research Field:
Publishing date:

Info

Title:
Experimental Research and Theoretical Analysis on Progressive Collapse Resistance of Prestressed Fabricated PC Frame with Removal of Side Columns
Author(s):
SONG Man-rong1; 2;  HU Ren-qiang1; 2;  HUANG Shen-jiang1; 2;  LIU Chen-pu1; 2;  HE Jia-xuan1; 2;  LIU Bing-kang1; 2
(1. School of Civil Engineering and Hydraulic Engineering, Hefei University of Technology, Hefei 230009,Anhui, China; 2. Anhui Key Laboratory of Civil Engineering Structures and Materials, Hefei University of Technology, Hefei 230009, Anhui, China)
Keywords:
prestressed fabricated PC frame;  progressive collapse;  removal of side column;  experimental research;  theoretical analysis
PACS:
TU378.4
DOI:
10.19815/j.jace.2021.12025
Abstract:
The experiment and theoretical analysis of static removal of bottom side columns of a two-story and two-span prestressed fabricated prestressed concrete(PC)plane frame were carried out, and the crack development, deformation capacity, failure mode and progressive collapse mechanism were explored. According to the state when the test frame reached the ultimate bearing capacity, a simplified structural resistance analysis model when the side column failed was proposed, and the calculation method of the ultimate bearing capacity of the structure against collapse was deduced. An approximate dynamic response evaluation model was established based on the energy method, and the dynamic response curve of the test frame under transient failure of the side column was approximately obtained according to the static load-displacement curve of the test frame. The results show that the stress process of the frame can be divided into four stages of elasticity, elastoplasticity, plastic hinge and collapse. During loading process, the concrete crack development and failure of the specimen are concentrated in the joint of the beam ends on both sides of the frame beam in the adjacent area of the failed side column. Except for the failed side columns, the other frame columns and the frame beam ends far away from the failed columns are basically intact. In the small deformation stage, the frame is stressed according to the beam mechanism, and there are compression arch action and vierendeel frame action. In the stage of large deformation, it can not be stressed according to the catenary mechanism, the unbalanced load is resisted by the bending mechanism and vierendeel frame action of the beam.When the side column fails, the maximum resistance of the prestressed fabricated PC frame reaches 60.9 kN, the final collapse displacement is 430 mm, and the beam end angle is 10.0°～15.3°, which has good resistance to progressive collapse.

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Last Update: 2022-05-30