已服役20年的预应力混凝土空心板梁单元静力承载力试验研究

Research of the Static Bearing Capacity Test of a 20-year-old Prestressed Concrete Hollow-plate B

通过对一根已服役20年的预应力混凝土空心板梁单元静力承载力试验室试验,研究该梁单元在不同荷载工况作用下各个截面的挠度情况和混凝土应变,获得该梁单元的静力承载力情况;同时利用有限元分析软件ANSYS建立预应力混凝土空心板梁单元的有限元模型,分析在不同荷载工况作用下梁截面的挠度和混凝土应变,试验分析结果和理论计算结果进行对比分析,以此进行已服役20年结构的耐久性能评估并对结构整体性能进行评定。

Through the static bearing capacity laboratory tests of a 20-years in-service prestressed concrete hollow-plate beam unit, the deflections and concrete strain of each section under different load condition of this beam unit are studied, which can access to the static bearing capacity status of the beam element. Meanwhile, the finite element model of prestressed con- crete slabs unit is established by the finite element analysis software ANSYS. Then, the deflections and concrete strain of each section under different load condition are analyzed. The structural durability assessment and evaluation of overall performance can be evaluated through the comparing and analysis of experimental analysis results and the theoretical calculation results.