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针对GB 50011—2010《建筑抗震设计规范》中排架柱在罕遇地震作用下层间位移角限值取值问题,对一个实际的火电厂汽机房竖向框排架结构进行分析。首先针对结构中的单根排架柱进行不同初始转角和不同轴压比的非线性分析,结果表明:1/40的层间位移角限值能较安全和经济地评价算例中排架柱的抗震性能;然后对整体结构进行了不同场地类别罕遇地震作用下的动力弹塑性分析,从层间位移角的宏观指标和基于材料塑性变形定义的构件损伤指标对该结构算例中的排架部分进行抗震性能评价,进一步验证了1/40的层间位移角限值对结构排架部分的抗震性能评价能更好地与基于材料塑性变形定义的构件损伤指标的评价结果相吻合。
In view of the problem of the value of the displacement angle limit of the inter-story columns under the seismicity of rare earthquakes in GB 50011-2010 Code for Design of Seismic Design of Buildings, the vertical frame truss structure of steam turbine room of an actual thermal power plant is analyzed. Firstly, the nonlinear analysis of different initial angles and different axial compression ratios of single-rowed columns in the structure is carried out. The results show that the 1/40 layer displacement angle limit can be more safely and economically evaluated in the example Then the dynamic elasto-plastic analysis of the whole structure under the rare earthquakes of different site types is carried out. From the macroscopic indexes of the interlayer displacement angle and the component damage indexes defined based on the material plastic deformation, The seismic performance evaluation of the berth part further verifies that the 1/40 layer drift angle limit value can better evaluate the seismic performance of the structural part of the truss with the evaluation result of the component damage index based on the material plastic deformation definition.