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选取前方向效应近场地震波、滑冲效应近场地震波和远场地震波,对按《工业与民用建筑抗震设计规范》(TJ11-78)设计的4层钢筋混凝土框架结构进行了弹塑性时程分析。结果表明:前方向效应近场地震动和滑冲效应近场地震动对结构反应有很强的放大作用,当结构为弹性时对基底剪力影响较大,进入塑性后,对位移的影响更显著。综合弹塑性时程分析和Pushover分析两种方法对结构的抗震性能进行了评估,发现结构在小震下的整体变形超出了我国现有规范的限值,而在大震时发生了倒塌,从而从计算的角度解释了汶川地震中那部分20世纪80年代建造的结构倒塌的原因。
Elastic-plastic time-history analysis of 4-story reinforced concrete frame structures designed according to the Code for Seismic Design of Industrial and Civil Buildings (TJ11-78) is made by selecting the near-field seismic wave of forward direction effect, near-field seismic wave of sliding-impulse effect and far-field seismic wave . The results show that the near-field vibration and sliding-near effect of the forward-direction effect have a strong amplification effect on the structural response. When the structure is elastic, the influence on the base-shear force is greater, and the influence on the displacement is more significant when the structure is plasticized. The comprehensive elasto-plastic time-history analysis and Pushover analysis are used to evaluate the seismic performance of the structure. It is found that the overall deformation of the structure under small earthquakes exceeds the limits of the existing codes in China and collapses in the event of a large earthquake The reasons for the structural collapse of that part of the 1980s Wenchuan earthquake were explained from a computational perspective.