Experimental study on fire resistance of precast concrete columns with efficient reinforcement. (1st February 2020)

• Record Type: Journal Article
• Authors: Xu, Haoming; Yu, Min; Xue, Congcong; Xu, Lihua; Ye, Jianqiao
• Is Part Of: Engineering structures. Volume 204(2020)
• Publication Date: 2020-02-01
• Subjects: Precast concrete columns -- Efficient reinforcement -- Cluster reinforcement -- Large-diameter reinforcement -- Rebar splicing by grout-filled coupling sleeve -- Rebar lapping in grout-filled hole -- Fire resistance; Structural engineering -- Periodicals; Structural analysis (Engineering) -- Periodicals; Construction, Technique de la -- Périodiques; Génie parasismique -- Périodiques; Pression du vent -- Périodiques; Earthquake engineering; Structural engineering; Wind-pressure; Periodicals; 624.105
• DOI: 10.1016/j.engstruct.2019.109947
• Languages: English
• ISSNs: 0141-0296

Abstract

Highlights: We first conducted fire resistance tests on precast concrete columns with efficient reinforcement. We found that the connection zone had higher fire resistance than the non-connection zone. We found that the form of efficient reinforcement had a marked influence on the fire resistance of precast concrete columns. We proposed a modified simple approach to predict fire resistance of the precast concrete columns. Abstract: In order to improve installation efficiency, construction quality and reduce the cost of monolithic precast concrete frame structures, precast concrete columns reinforced by efficient reinforcement have been proposed in recent years. Their static and seismic behaviors generally meet design expectations, while, to the authors' best knowledge, their fire resistance has not been properly studied. In this paper, results from fire resistance experiments on full-scale precast concrete columns reinforced by efficient reinforcement under standard fire exposure conditions are presented. The effect of reinforcement forms, load intensity and fire conditions on the fire resistance of the precast concrete columns has been studied. The test results show that fire resistance of the connection zone of the precast concrete column is higher than that of the non-connection zone. The test results also show that precast concrete columns reinforced by cluster reinforcement have a higher fire resistance than columns reinforced by large-diameter reinforcement. On the basis of the test results and the calculation methods current in use, a simplified approach that considers the effect of cross-sectional area reduction and temperature difference caused by spalling is proposed to predict fire resistance of precast concrete columns reinforced by efficient reinforcement.