混合预应力抗弯加固钢筋混凝土“T”梁有限元分析  

Mixed prestressed fexural strengthening concrete T beam of finite element analysis

作　　者：戴成元[1] 赵建梅[1] 李广华[2] 

机构地区：[1]辽宁工程技术大学土木与交通学院,辽宁阜新123000 [2]北京城建七建设工程有限公司,北京100029

出　　处：《辽宁工程技术大学学报（自然科学版）》2014年第6期810-815,共6页Journal of Liaoning Technical University (Natural Science)

摘　　要：为了解决现役桥梁加固造价高、加固过程中易造成黏结破坏及加固材料难以完全发挥作用等问题,提出混合预应力加固技术.结合连江大桥16 m"T"梁段,利用Midas CIVIL有限元软件,对其进行结构核算和加固前后有限元分析.结果表明:混合预应力加固技术将先张法和后张法同时作用于被加固结构构件,改变了传统加固技术的传力机理,加固后的"T"梁,在基本不增加"T"梁自重的情况下,"T"梁的抗弯、抗剪承载力得到明显提高,整体挠度和裂缝宽度得到有效减小,较好地解决了加固后"T"梁延性差的问题,同时采用普通水泥砂浆替代普遍采用的高性能砂浆,降低工程造价,与现有桥梁加固技术相比具有明显优势,值得在桥梁加固工程中推广应用.In order to solve the high cost, bond failure and reinforcement material of active bridge strengthening, this paper putforward a mixed prestressed reinforcement technology. Combining with LianJiang 16m T beam, this study utilized Midas CIVIL finite element software, and performed the accounting structure and finite element analysis of before and after reinforcement. The results show that mixed prestressed reinforcement technology combines pre-tensioned with post-tensioned simultaneously on the reinforced structural member, which has changed the traditional transfer mechanism of reinforcement technology. After the bridge reinforcement, in the general case without increasing the weight of the bridge, bending and shear capacity of T beam has been significantly improved, and overall deflection and crack width have been effectively reduced, which is a better solution to the problem of poor ductility T beam, and reduces project cost by using ordinary cement mortar to replace high-performance mortar. Compared with the existing bridge reinforcement technology, the method has obvious advantages, and it is worth applying in bridge strengthening projects.

关 键 词：钢筋混凝土 “T”梁 混合预应力加固 强度验算 数值模拟 先张法 后张法 应力计算 

分 类 号：TU43[建筑科学—岩土工程]