高性能碳纤维增强塑料(CFRP)绞线筋粘结性能研究  

Study on bond properties of high performance CFRP strands

作　　者：薛伟辰[1] 王晓辉[1] 

机构地区：[1]同济大学建筑工程系,上海200092

出　　处：《建筑结构学报》2006年第6期67-73,共7页Journal of Building Structures

基　　金：国家自然科学基金项目(50008012);上海市青年科技启明星计划项目(02QF14047);交通部西部交通建设科技项目(2006ZB06)

摘　　要：通过48个拉拔试件对高性能碳纤维增强塑料（CFRP）绞线筋与不同环境介质（包括普通混凝土C50、高性能混凝土C50、R42．5水泥浆以及环氧树脂等）之间的粘结性能进行了较为系统的研究。研究表明：当滑移值为0．3-0．4mm时，CFRP绞线筋的粘结应力达到最大，相比之下，钢绞线的粘结应力最大值则发生在滑移值为20mm左右时；CFRP绞线筋直径对粘结强度的影响不明显；CFRP绞线筋的锚固失效粘结强度比钢绞线大1．3-1．4倍，而钢绞线的最大粘结强度比CFRP绞线筋大1．3-1．5倍。在试验研究的基础上，本文还给出了CFRP绞线筋的粘结应力．滑移曲线的理论方程，并提出了CFRP绞线筋的相对粘结特性系数的设计建议。Based on tests of 48 pull-out specimens, bond properties of high performance CFRP strands in different mediums （including normal concrete C50, high performance concrete C50, grade 42.5 mortars and epoxy resins） are systematically studied. The results show that bond stress reaches maximum when the slippage of CFRP strands specimens is between 0.3 - 0.4mm, in contrast with the fact that the bond stress of steel strands reaches maximum when the slippage is about 20mm. The diameters of CFRP strands have little influence upon bond strength, however the higher concrete strength grades, the higher bond strength was measured. The effective bond strength of CFRP strands is 1.3 - 1.4 times that of steel strands, while the maximum bond strength of steel strands is 30 - 50 percent higher than that of CFRP strands. In addition, bond stress-slippage curves of CFRP strands and design suggestions for coefficient of relative bond properties of CFRP strands are presented based on the tests.

关 键 词：CFRP绞线筋 拉拔试验 粘结性能 设计建议 

分 类 号：TU377.9[建筑科学—结构工程] TU317.1