预应力高强钢绞线网抗剪加固钢筋混凝土梁试验  

Experiment on shear behavior of reinforced concrete beams strengthened with prestressed high strength steel wire mesh

作　　者：郭俊平[1] 邓宗才[1] 卢海波 林劲松 

机构地区：[1]北京工业大学建筑工程学院,北京100124 [2]北京环友建筑技术发展有限责任公司,北京100045

出　　处：《吉林大学学报（工学版）》2014年第4期968-977,共10页Journal of Jilin University:Engineering and Technology Edition

基　　金：国家自然科学基金项目(50978006)

摘　　要：采用新型张拉锚固系统,对剪跨比为2.2和1.65的预应力钢绞线U形抗剪加固梁各3根和1根未加固梁进行了对比试验,研究预应力水平、剪跨比对加固效果的影响规律。试验结果表明:预应力抗剪加固可提高梁的承载力、截面刚度;当预应力水平小于0.3时,承载力、截面刚度、钢绞线利用率随预应力水平的提高而提高;当预应力水平大于0.3时,加固梁的承载力随预应力水平的提高相对降低。建立了预应力高强钢绞线U形抗剪加固梁的承载力计算式,计算结果与试验值吻合良好。研究结果可为预应力钢绞线抗剪加固混凝土梁设计和施工提供参考。The shear behavior of concrete beams reinforced with U-shaped high strength steel wire mesh at different prestress levels with new tension and anchor system is investigated. Six beams reinforced with high strength steel wire mesh at different prestress levels and shear span to depth ratio of 2.2 and 1.65 （3 specimens for each ratio） were tested and compared with one reinforced concrete beam without high strength steel wire mesh. The results show that the load capacity and the stiffness of beams reinforced with prestressed steel wire mesh increase with the prestress level of the steel wire mesh. If the prestress level is greater than 0.3, the increase rate of the load capacity is reduced. A model to predict the shear capacity of the beams is proposed. The predicted results using this model are in good agreement with the experiment results. The proposed model can be used for theoretical analysis and design of concrete beams strengthened with prestressed steel wire mesh.

关 键 词：土木建筑结构 预应力 高强钢绞线 钢筋混凝土梁 抗剪承载力 

分 类 号：TU378.2[建筑科学—结构工程]