Work

Influence of elevated temperature on the performance of pre-damaged grouted sleeve connections under tension and compression

Year: 2025

Type: article

Abstract: This study investigates the performance of grouted sleeve connections (GSCs) under post-earthquake fire conditions. A total of 62 specimens were fabricated with variations in anchorage length (6 d , 7 d , 8 d ), pre-damage protocol (unidirectional and cyclic loading), and exposure temperature (20°C to 800°C). The response was evaluated based on residual deformation, hysteretic behavior, failure mode, strength, deformation capacity, and bond stress. Results indicate that GSCs become increasingly susceptible to rebar pull-out failure when subjected to shorter anchorage lengths, more severe pre-damage, and higher temperatures. Both yield strength and ultimate displacement decrease with increasing temperature. The ultimate strength of connections failing in pull-out is significantly lower than those failing by rebar fracture. Furthermore, while GSCs exhibiting rebar fracture satisfy standard performance evaluation criteria, those failing by pull-out do not. A bond stress coefficient k is proposed; for GSCs with an 8 d anchorage length, a value of k > 1.80 is recommended to prevent premature pull-out and ensure a ductile fracture failure mode.

Source: Construction and Building Materials

DOI: 10.1016/j.conbuildmat.2025.144690

Authors: Jinyi Zhang, Xianzhong Xie, Jialu Wang, Yibo Zhou, Ao Wang, Weijian Yi

Institutions: Hunan University of Science and Technology, Hunan University

Language: English

Topic: Fire effects on concrete materials

Subfield: Civil and Structural Engineering

Field: Engineering

Domain: Physical Sciences

SDG: Industry, innovation and infrastructure

Open Access status: hybrid

Estimated APC paid: $4,540