复合材料套管加固钢柱的压弯性能

复合材料科学与工程 ›› 2020, Vol. 0 ›› Issue (9): 48-60.

复合材料套管加固钢柱的压弯性能

魏劭杰, 冯鹏^*, 杨家琦, 刘天桥

清华大学土木工程系土木工程安全与耐久性教育部重点实验室,北京100084

收稿日期:2020-06-23 出版日期:2020-09-25 发布日期:2020-09-28
通讯作者: 冯鹏(1977-),男,博士,教授,主要从事新材料结构及新型结构方面的研究,fengpeng@tsinghua.edu.cn。
作者简介:魏劭杰(1990-),男,硕士研究生,主要从事复合材料加固方面的研究。
基金资助:
国家重点研发计划(2017YFC0703000)

BEHAVIOR OF FRP TUBE STRENGTHENED STEEL MEMBERS UNDER ECCENTRIC COMPRESSION LOAD

WEI Shao-jie, FENG Peng^*, YANG Jia-qi, LIU Tian-qiao

MOE Key Laboratory of Civil Engineering Safety and Durability of China, Department of Civil Engineering, Tsinghua University, Beijing 100084, China

Received:2020-06-23 Online:2020-09-25 Published:2020-09-28

摘要/Abstract

摘要： 本文对采用复合材料拉挤型材套管、灌浆料及单向复材布加固的偏心受压钢构件的性能进行了试验研究,通过20根钢柱的压弯试验,研究了截面形状、长细比、偏心率等参数对加固效果的影响,得到了各构件极限承载力、破坏模式、荷载-位移曲线及关键位置应变的变化规律。试验结果表明:加固可使钢柱的偏心受压承载力大幅提升,最大提高了169%;同时构件的破坏模式从整体压弯屈曲转变为钢柱未加固段钢材的屈服破坏。本文还通过三维有限元分析,对加强段长度比、加强段抗弯刚度比、钢材屈服强度和强屈比、核心钢初始挠曲和核心钢长细比等6个参数进行了分析,得到了各加固参数对钢柱压弯性能的影响规律。此研究为复合材料套管加固钢柱技术应用提供了参考依据。

关键词: 复合材料, 钢柱, 加固, 压弯, 极限承载力

Abstract: In this paper, the steel columns were strengthened by pultruded GFRP tube, GFRP sheet and grouting, and their behavior was investigated through eccentrically compression tests. Through tests on 20 steel columns, the influences of different sections, slenderness ratios and eccentricity ratios on the strengthening effect were addressed. Ultimate strength after strengthening, failure mode, load-displacement curve,and strains at key positions were investigated. The test results showed that the ultimate strength of strengthened steel members increased by up to 169%. In addition, the failure mode of the eccentrically compressed members were transitioned from global lateral buckling to local deformation in the unstrengthened area. In addition, the finite element model of steel column was constructed, and the simulation results are in good agreement with the test results. Finally, the finite element modeling is used to analyze six parameters including the length ratio of the strengthened section, the bending stiffness ratio, the ultimate strength and yield strength of the steel, the initial deflection of the core steel members and the slenderness ratio of the core steel members, and the influence law of each parameter on the test was revealed.

Key words: FRP composite material, steel column, strengthening approach, eccentrically compression, ultimate strength

中图分类号:

TB332

魏劭杰, 冯鹏, 杨家琦, 刘天桥. 复合材料套管加固钢柱的压弯性能[J]. 复合材料科学与工程, 2020, 0(9): 48-60.

WEI Shao-jie, FENG Peng, YANG Jia-qi, LIU Tian-qiao. BEHAVIOR OF FRP TUBE STRENGTHENED STEEL MEMBERS UNDER ECCENTRIC COMPRESSION LOAD[J]. Composites Science and Engineering, 2020, 0(9): 48-60.

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