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借助25个不同跨度、不同矢跨比、不同下部结构、不同支座连接条件的结构模型,考察双层球面网壳在设防烈度地震下的弹塑性动力响应性能.该25个模型的网壳杆件截面均根据非抗震设计工况的满应力优化设计确定,并满足多遇地震作用的验算.所有模型的结构分析均考虑上下部结构的共同工作,网壳杆单元采用了能够同时考虑受拉屈服和受压屈曲的等效弹塑性滞回模型.设防烈度地震下结构的弹塑性动力响应采用非线性时程法计算,地震波采用由规范反应谱生成的三向人工波.根据计算结果,统计了25个模型在7度、8度设防烈度地震下网壳塑性变形杆件的分布、塑性应变大小和结构残余变形,并对主要的影响因素进行了分析.研究表明,中小跨度双层球面网壳在7、8度中震作用下均未出现塑性变形杆件;大跨度双层球面网壳在中震作用下会出现一定数量的塑性变形杆件,其分布区域与下部结构刚度有关,但大多出现在中间圈层;矢跨比和下部结构的对称性是影响塑性变形杆件数量和塑性应变大小的两个主要因素.
The elastic-plastic dynamic response of double-layer reticulated dome under earthquake with seismic intensity is investigated by means of 25 structural models with different span, different ratio of vertical and span, different substructure and different abutment connection conditions. The sections of the sections are all determined according to the full stress optimization design of the non-aseismic design conditions and meet the checking of the earthquake event. The structural analysis of all the models considers the joint work of the upper and lower structures, Yielding and buckling buckling of the equivalent elastic-plastic hysteretic model fortification seismic elasto-plastic dynamic response of the structure using nonlinear time-history method, the seismic wave using the standard response spectrum generated by three-dimensional artificial wave.According to the calculation results, statistics The distribution, plastic strain and structural residual deformation of 25 plastic deformation bars under 7 degree and 8 degree fortified earthquakes are analyzed and the main influencing factors are also analyzed.The results show that the medium and small span double layer spherical net No deformation of the bar was observed under the moderate and moderate shocks of 7 and 8 degrees. A large number of plastic deformation of the long-span double- Member, and the lower distribution area related to structural rigidity, but mostly in the middle circle; span ratio and lower structural symmetry are two major factors affecting the plastic deformation of the bars of the number and size of plastic strain.