CFRP约束高强混凝土柱长期性能研究  

Study on Mechanical Behavior of High-Strength Concrete Square Columns Strengthened with CFRP under Sustained Loading

作　　者：王苏岩[1] 刘磊[1] 

机构地区：[1]大连理工大学土木水利学院海岸和近海工程国家重点试验室,辽宁大连116024

出　　处：《沈阳建筑大学学报（自然科学版）》2007年第1期42-46,共5页Journal of Shenyang Jianzhu University：Natural Science

基　　金：国家自然科学基金项目(50378011);辽宁省教育厅科技项目

摘　　要：目的研究长期荷载作用对CFRP约束高强混凝土柱受力性能的影响.方法通过18个碳纤维布约束高强混凝土柱试件,对碳纤维布约束高强混凝土方柱的徐变和轴压力学性能进行了试验研究,考虑了碳纤维布用量、粘贴方式和纤维布条带间距等因素对试件性能的影响.基于ACI209(1992)的方法,对试验结果进行了验算.结果表明试验值与预测值下限基本吻合.分析比较了长期荷载作用对构件的承载力、应变等力学性能的影响.结论CFRP约束高强混凝土在长期荷载作用下早期变形发展很快,后期变形基本趋于平缓;长期荷载作用会使CFRP约束高强混凝土柱的极限承载力和极限应变下降,下降幅度随纤维布用量的增大而增大;长期荷载试件的变形普遍比ACI209(1992)的平均预测值小,和预测值下限基本吻合.An experimental study of eighteen high-strength concrete square columns strengthened with CFRP under longterm sustained loading is conducted in order to study the longterm load effects on highstrength concrete columns confined with CFRP. The experimental factors include the amount of CFRP, bonding methods and spaces between CFRP trips. The comparisons between the calculation results based on the ACI209（1992）specifications and test results show a basic agreement with the lower limited prediction. The mechanical property effects of long-term sustained loading, such as capacity and ultimate strain, are analyzed. The development of strain corresponding time is fast during the early stage where as slower during advanced stage. The capacity and ultimate strain are reduced because of the long-term sustained loading. The reducing degree becomes greater along with the increasing of CFRP ratio. The strain of long-term load specimen basically agree with the lower limited prediction of ACI209（1992）model.

关 键 词：碳纤维布(CFRP) 高强混凝土柱 徐变 应变 

分 类 号：TU375.3[建筑科学—结构工程]