高强钢绞线网加固RC梁抗剪性能及计算方法  

Shear performance and design methods of strengthened RC beams with high strength steel wire mesh

作　　者：黄华[1,2] 刘伯权[1] 吴涛[1] 

机构地区：[1]长安大学建筑工程学院,陕西西安710061 [2]长安大学旧桥检测与加固技术交通行业重点实验室,陕西西安710064

出　　处：《中南大学学报（自然科学版）》2011年第8期2485-2492,共8页Journal of Central South University:Science and Technology

基　　金：高等学校博士点基金资助项目(20090205120008);中央高校科研专项基金资助项目(CHD2009JC160);长安大学基础研究专项基金资助项目(2009)

摘　　要：对高强不锈钢绞线网-渗透性聚合物砂浆加固的9根矩形钢筋混凝土梁进行试验研究,并采用有限元程序对抗剪加固梁进行数值计算,分析混凝土强度、原梁配箍率、钢绞线用量、固定螺栓的数量和间距、加固方式、剪跨比、二次受力等因素对加固性能的影响。在试验研究和理论分析的基础上,提出抗剪加固承载力计算公式。研究结果表明:该加固工艺能够显著提高混凝土梁的抗剪承载力;多而密的固定螺栓对原梁抗剪承载力造成极大削弱;U形加固与环包加固对抗剪承载力提高程度有一定影响,且破坏模式和钢绞线的利用率有显著区别;持载程度高的梁加固承载力提高幅度低,但修复加固梁效果显著;随混凝土强度和配箍率提高,极限承载力提高。Experiments were conducted to investigate the shear behavior of nine strengthened RC rectangular beams,and the finite element methods were used to analyze the shear performance of strengthened beams.The influence of concrete strength,stirrup ratio,quantity of stainless steel wire,bolts＇ amount,bolts＇ distance,strengthening mode and shear span ratio,secondary load on the shear performance were discussed.Based on experiments and theory analysis,the design formulae of shear capacity were proposed.The test results show that the rehabilitation greatly increases the beam＇s shear load-carrying capacity.Too much and dense bolts badly weaken the shear behavior of beam itself.The influences of the strengthening manners on the load capacity are puny,and the beams＇ failure modes and the utilization ratio of stainless steel wire are remarkably different.The increasing range of the beam＇s load-carrying capacity is lower if its secondary load is bigger.But the rehabilitation effects of the failure beams are remarkable.With the increase of concrete strength and stirrup ratio,the strengthened beam＇s ultimate bearing capacity increases.

关 键 词：高强钢绞线网 加固 抗剪性能 数值分析 

分 类 号：TU375.102[建筑科学—结构工程]