大跨度悬臂拼装施工连续梁桥0号梁段局部应力分析

采用悬臂拼装施工的大跨度预应力混凝土连续梁桥,因0号块梁段的构造和受力较为复杂,保证它的质量与安全非常重要。本文以孙口黄河公路大桥为工程实例,运用Midas/Civil和Ansys有限元程序分别建立了该桥梁的整体计算模型和0号块梁段的局部计算模型,考虑桥梁施工、成桥以及运营阶段多种工况对0号梁段进行了局部受力分析。计算结果表明:该桥梁原设计的0号梁段隔板与腹板、底板交接处,底板支座等部位较为薄弱,需局部加强。计算结果已直接应用于实际工程,具有较高的实用价值。

Local stress analysis of segment No.0 of long span continuous beam bridge constructed with cantilever erection method

For the long span prestressed concrete continuous bridge adopting cantilever erection construction method,it was important to make sure the quality and security of segment No.0,because of its complex structure and stress state.The Sunkou Yellow River bridge was taken as an engineering example,and the whole calculational model and local model were established by means of the finite element software Midas/civil and Ansys separately,the particular local stress analysis was made,with the construction,completed and service stage of bridge taken in account of.The results of calculations indicate that the connected location of diaphragm,web and soleplate,and the location of steadier on the soleplate and so on where the strength is weak relatively should be reinforced locally.The results of calculation have been put into practice and have great practical value.