高强不锈钢绞线网-渗透性聚合砂浆加固的T型梁桥试验

Experiment on RC T-type Beam Bridge Strengthened with High Strength Stainless Steel Wire Mesh and Permeability Polymer Mortar

以采用高强不锈钢绞线网-渗透性聚合砂浆加固技术加固的某大桥为工程背景,采用大比例模型试验,分析加固T型梁抗弯承载力的影响因素及其破坏特征。在试验研究的基础上,给出采用此法进行抗弯加固的T型梁承载力、刚度以及最大裂缝宽度的计算公式。同时对试验桥梁在加固前后进行了静力荷载试验。结果表明:该加固措施有效提高了梁的抗弯承载力和刚度,显著减小了桥梁裂缝宽度,并延迟了裂缝的出现;该加固技术可在不影响桥梁通行的情况下进行,具有良好的经济与社会效益。

Using rehabilitation technique of RC members with high strength stainless steel wire mesh and permeability polymer mortar for an RC T-beam strengthening which is regarded as engineering background, a big reduced scale mode experiment was used to analyze the influence factors of the strengthened T-beams＇ flexural bearing capacity and its failure mode. Based on the test results, the design formulae of flexural bearing capacity, stiffness and maximum crack width were proposed. Static loading test was conducted on the performance of this bridge before and after the installation of the strengthening system. The results show that the flexural bearing capacity and stiffness are increased effectively, the width of crack is reduced obviously and the cracking production is postponed. The strengthened technique has good social and economic benefits without influencing on bridge traffic running.