新闻搜索
文章正文
GFRP-钢屈曲约束支撑力学性能试验研究
作者:管理员    发布于:2014-12-20 17:20:34    文字:【】【】【
摘要:土木工程学报——2014.12(47) CHINA CIVIL ENGINEERING JOURNAL——Dec.2014 Vol.47 No.12
潘 鹏1邓开来1胥晓光2叶列平1解晋珍3
( 1. 清华大学土木工程安全与耐久教育部重点实验室,北京 100084;2. 中国城市建设研究院有限公司,北京 100120; 3. 中国地震局工程力学研究所,黑龙江哈尔滨 150080)

摘要: 提出 GFRP-钢屈曲约束支撑的构造及其生产工艺。通过对4 个 GFRP-钢屈曲约束支撑足尺试件进行低周往复加载试验,研究 GFRP-钢屈曲约束支撑的受力性能、破坏形态和耗能能力,考察外围约束单元中 GFRP 缠绕层厚度、缠绕角度和钢芯材形式对 GFRP-钢屈曲约束支撑性能的影响。建立了 GFRP-钢屈曲约束支撑的精细有限元模型,并对典型试验工况进行模拟。主要研究成果如下: ①GFRP-钢屈曲约束支撑由钢芯材和 GFRP 拉挤型材通过缠绕工艺组合而成,容易实现工业化生产; ②合理设计的 GFRP-钢屈曲约束支撑的力学性能稳定,滞回曲线饱满,耗能性能优良; ③增加外围约束单元中 GFRP 缠绕层厚度有利于提高 GFRP-钢屈曲约束支撑的性能; ④改变外围约束单元中 GFRP 缠绕角度对支撑性能无显著影响; ⑤相对于一字形截面钢芯材,十字形钢截面芯材对外围约束单元的局部挤压更轻微,表现出更好的力学性能; ⑥精细有限元模型可有效模拟 GFRP-钢屈曲约束支撑的力学行为,模型精度较好。
关键词: 屈曲约束支撑; GFRP 拉挤型材; 缠绕工艺; 低周往复试验
中图分类号: TU391 文献标识码: A 文章编号: 1000-131X( 2014) 12-0001-08
Experimental study on mechanical behavior of GFRP-steelbuckling-restrained braces

Abstract: A new GFRP-steel buckling-restrained brace ( BRB) and its relevant manufacturing techniques were proposedin this work. Based on the cyclic quasi-static tests of 4 GFRP-steel BRB specimens,the mechanical properties,damagemodes,and energy dissipation capacity of the braces were studied. Effects of the thickness of wrapping layer,thewrapping angle,and the shape of the core steel on the behavior of the braces were investigated. Furthermore,a finiteelement model was established to simulate the behavior of the GFRP-steel BRB and simulate some typical test cases.Consequently,some valuable results and conclusions can be attained: ① The new GFRP-steel BRB is easy to bemanufactured; ② Well-designed braces have satisfactory mechanical properties and energy dissipation capacity; ③Increasing the thickness of wrapping layers is helpful to improve the seismic performances of braces; ④ Wrapping angleof GFRP layer does not have much effects on the performance of the braces; ⑤ Compared to the core steel withrectangular section,the core steel with criss-cross section exhibits better performances due to its slight local compressionon the surrounding restrained elements; ⑥ The finite element model can be used to simulate the behavior of GFRP-steelBRB with satisfactory accuracy.
Keywords: buckling-restrained brace; GFRP pultruded profile; wrapping technique; low-cycle repeated quasi-static test.
E-mail: panpeng@ tsinghua.edu.cn

分享到: 更多
脚注信息
版权所有 Copyright(C)2009-2021 东华理工大学薛凯喜博士教学科研团队
分享到: