预应力砼桁架T构桥梁剪力铰及拉压支座病理分析

摘要

T-frame bridge of prestressed concrete truss is one of the specific forms of bridge structures , inte-grated characteristics of the three structures cable-stayed , truss and T Rigid and mechanical .Based on the re-search of Hongtang Bridge , the author found that shear strategy and tension-compression bearing , as special components of bridge abutment , are frequently damaged , but few examples and research findings of such bridge-engineering are reported , and the damage mechanism is not clear .Hongtang Bridge Model is estab-lished by finite element software to analyze the factors that may cause disease by univariate and multivariate or -thogonal test , such as prestressed loss , uneven foundation settlement , as well as the degree of influence caused by stiffness and loss of live load and shear hinges bearing tension and compression , which provide valu-able reference for its design optimization .%预应力砼斜拉桁架T构桥是一种较为特殊的桥梁结构形式，综合斜拉、桁架及T形刚构三种结构的受力特点。以洪塘大桥为依托工程，剪力铰和拉压支座作为该桥的特殊构件，经常发生破坏，但是此类桥型工程实例及研究成果较少，桥梁产生病害的机理尚不明确。采用大型有限元软件建立洪塘大桥模型，用单因素和多因素正交试验法分析可能引起病害的因素，如预应力损失、基础不均匀沉降、刚度损失和活载对剪力铰和拉压支座的影响程度，为其设计优化提供有价值的参考和借鉴。