Web crippling of galvanized steel tube strengthened by CFRP sheets
Web crippling of galvanized steel tube strengthened by CFRP sheets
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DOI：
10.1016/j.compositesb.2015.08.083
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发表时间：
2016
影响因子：
13.1
通讯作者：
Yu Chen;Xixiang Chen;Chaoyang Wang
中科院分区：
文献类型：
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作者：
Yu Chen;Xixiang Chen;Chaoyang Wang
腹板失稳是镀锌钢管构件在集中荷载或反力作用下的主要破坏模式。碳纤维增强聚合物（CFRP）片材被认为是有前途的金属结构构件的加强。本文介绍了碳纤维布加固高强镀锌钢管构件的试验方案。介绍了16个腹板失稳试验的结果，其中8个试验为未加固的镀锌方钢管腹板失稳试验，8个试验为加固的镀锌方钢管腹板失稳试验。给出了试验方案、破坏形态和荷载-位移曲线。研究了边界条件、荷载条件和碳纤维布层数对镀锌方钢管腹板失稳加固的影响。由于碳纤维布加固，腹板失稳极限承载力得到了显著提高。当碳纤维布层数超过3层时，腹板失稳极限承载力提高不明显。建立了有限元模型，对实验结果进行了数值模拟。基于参数研究结果，本文提出的一些设计公式可以成功地用作预测四种荷载和边界条件下碳纤维布加固镀锌钢管截面腹板屈曲极限承载力的设计准则。
Web crippling is the major failure mode of galvanized steel tube members when they are subjected to concentrated loads or reactions. Carbon fibre-reinforced polymer (CFRP) sheets were found to be promising for strengthening metallic structural members. This paper presents a test program on strengthening of high strength galvanized steel tubular structural members using externally bonded CFRP sheets. The results of 16 web crippling tests were presented, with 8 tests conducted on galvanized steel square hollow sections without CFRP sheets strengthening and 8 tests conducted on galvanized steel square hollow sections with CFRP sheets strengthening. The experimental scheme, failure modes and load–displacement curves were also presented. The investigation was mainly focused on the effects of boundary condition, loading condition and CFRP sheets layers for the strengthening of galvanized steel square hollow sections against web crippling. Significant increase in web crippling ultimate capacity was obtained due to CFRP sheets strengthening. Enhancement of web crippling ultimate capacity was not obvious when CFRP sheets layers exceeds 3 layers. Finite element models were developed to numerically simulate the experimental results. Based on the results of the parametric study, a number of design formulas proposed in this paper can be successfully employed as a design rule for predicting web crippling ultimate capacity of galvanized steel tubular sections strengthened by CFRP sheets under four loading and boundary conditions.