|Table of Contents|

Performance degradation law of grouting sleeve connections with defects under high temperature and impact load(PDF)

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

Issue:
2025年04期
Page:
54-63
Research Field:
建筑结构
Publishing date:

Info

Title:
Performance degradation law of grouting sleeve connections with defects under high temperature and impact load
Author(s):
LIU Qizhou1; 2;  LI Mingfa2;  PANG Weidong2;  LI Chuchu2;  XIANG Fan2;  DAI Chengyuan1; 2
(1. Guangxi Key Laboratory of Green Building Materials and Construction Industrialization, Guilin University of Technology, Guilin 541004, Guangxi, China; 2. School of Civil Engineering, Guilin University of Technology, Guilin 541004, Guangxi, China)
Keywords:
grouting sleeve connection;  grouting defect;  fire;  impact load;  degradation law
PACS:
TU375.1
DOI:
10.19815/j.jace.2024.01024
Abstract:
Assembled buildings need to be fire-resistant and must also meet code-required impact resistance after experiencing a fire to avoid progressive collapse. Defective grouting of sleeves can severely weaken the fire and impact resistance of assembled building connections. However, the current model for the degradation of the bearing capacity of grouting sleeve with defects under high temperature and impact load is still unclear. For this reason, specimens of grouting sleeve connections with defects were fabricated and their static tensile and impact resistance performance after high temperature were investigated. The results show that the specimen mainly presents two failure modes, which are reinforcement fracture failure and reinforcement pull-out failure. Compared with static loading, the grouting material carried by reinforcement pull-out under impact loading is obviously increased. The value of the dynamic increase factor DDIF of the yield strength of the specimens is significantly greater than that of the ultimate strength whether at room temperature or high temperature. The dynamic increase factor of yield strength DDIF,y is not significantly affected by temperature and defects, and the dynamic increase factor of ultimate strength DDIF,u decreases with the increase of defect rate. The strength-yield ratio and ductility ratios of grouting sleeve connections under impact tensile conditions are significantly lower compared with static tensile, so due attention should be paid to the adverse effects of dynamic loading. A calculation model is established to characterize the degradation law of static and impact tensile ultimate bearing capacity of grouting sleeve connections with defects after high temperature. The model can provide a reference for the performance evaluation of defective assembled structures after fire.

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Last Update: 2025-07-10