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通过对现有中小学室内活动馆建筑功能和结构形式的调研,确定了10个有代表性的不同跨度、下部结构、支座连接形式的结构模型作为分析对象,考察其屋盖网架结构的弹塑性地震响应特点.各模型中的网架结构由非地震工况下的满应力优化设计确定,且均考虑与下部结构共同工作.杆单元采用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.多遇地震作用下的结构验算采用振型分解反应谱法,设防烈度地震及罕遇地震下结构的弹塑性动力响应计算采用非线性时程法,地震波采用由规范反应谱生成的三向人工波和两条天然波.根据计算结果,统计了网架模型在7度(0.1g)、8度(0.2g)设防烈度地震和罕遇地震下塑性杆件的分布、塑性应变大小和结构残余变形,并分析了主要影响因素.研究表明,小跨度网架结构在7度和8度中震、大震作用下均未出现塑性杆件,而中等跨度网架结构会出现一定数量的塑性杆件,其分布区域与下部结构刚度有关,且大多出现在临支座区域.地震波及其输入方向对塑性杆件数量和塑性应变大小有一定影响.所有模型在大震下均未发生倒塌.
Through the investigation of the building function and structure form of the existing indoor activity hall in primary and middle schools, 10 representative structural models with different span, substructure and support connection are determined as the analysis object, and the roof structure of the roof truss Elastic-plastic seismic response characteristics of the grid structure in each model by the non-seismic conditions of the full stress to determine the optimal design, and are considered with the substructure work together.The rod unit can be taken into account both yielding and buckling buckling and so on Elastic-plastic hysteresis model. Structural checking under multi-event earthquakes Using the mode-splitting response spectrum method, the fortification intensity is calculated using the non-linear time-history method for the elasto-plastic dynamic response of structures under earthquake and rare earthquakes. Spectrum generated by the three-dimensional artificial wave and two natural waves.According to the calculation results, the distribution of the plastic rod members under the seismic intensity of 7 degrees (0.1g), 8 degrees (0.2g) Plastic strain and residual deformation of the structure, and analyzed the main influencing factors.The results show that there is no plastic rod in the small-span grid structure under the earthquake and earthquake of 7 and 8 degrees, while the medium Degree grid structure will appear a certain number of plastic bar, its distribution area and the lower part of the structure stiffness, and most appear in the area of abutment .Seismic waves and the input direction of the number of plastic bar and plastic strain have some impact.All The model did not collapse under the earthquake.