预应力FRP加固钢管的临界屈曲理论研究  

Theory study of the critical buckling of prestressed FRP reinforcing steel pipe

作　　者：王勇[1] 莫军[1] 贾彬[1] 王汝恒[1] 

机构地区：[1]西南科技大学土木工程与建筑学院,四川绵阳621010

出　　处：《四川建筑科学研究》2017年第2期48-52,共5页Sichuan Building Science

基　　金：国家自然科学基金(51408513);四川省科技计划(2014HH0062)

摘　　要：预应力FRP加固技术应用于内压管线的修复、加固项目中,已经得到了人们的重视。本文针对预应力FRP加固钢管的临界屈曲进行了理论分析,重点分析了屈曲理论下钢管能承受的预应力极值。研究了钢管在预应力作用下其环向应力和径向应力的分布规律,获得了强度理论条件下的预应力极值P_(max1);基于壳体理论推导了预应力作用下钢管在径向方向的应变方程,得到了屈曲理论条件下的预应力极值P_(max2)。对比文献中的试验结果,通过本文分析得到的钢管径向应变的分布规律和文献给出的试验结果相一致。通过P_(max1)、P_(max2)获得了钢管在预应力作用下发生屈曲问题的临界条件,且P_(max1)、P_(max2)均随着径厚比的增加而递减,随材料屈服强度的增加而增加。Prestressed FRP reinforcement technology applied to the internal pressure pipeline repair and reinforcement has been paid attention. The theoretical analysis of the critical buckling of the steel tube reinforced with prestressed FRP was carried out, emphatically analyzed the stress extreme value of steel tube under buckling theory. The paper analyzed the distribution of circumferential stress and radial stress of the steel tube under prestress based on the strength theory, derived the extreme value of prestress P maxi. Based on shell theory, the strain equation of the steel tube in the radial direction was derived under the action of prestress, obtained the extreme value of the prestressing force under the condition of buckling theory. Compared with the experimental results in the literature, thedistribution of the radial strain of the steel tube obtained by this paper was consistent with the experimental results given in the literature. The critical condition of the buckling of steel tube under the action of prestressing was obtained through Pmaxl and At thesame time, Pmaxi and Pmax2 decreased with the increase of the diameter to thickness ratio, and increased with the increase of the yield strength of the material.

关 键 词：钢管 预应力FRP 临界屈曲 预应力极值 环向应力 

分 类 号：TU33[建筑科学—结构工程]