唐山市青少年宫主体结构抗震设计

Seismic design for main structure of Tangshan Children's Palace

唐山市青少年宫东区是一个混凝土与钢架联合的复杂建筑,混凝土主体结构南侧与带斜梁落地的钢架相连。采用MIDAS反应谱法和弹性时程对整体模型地震作用下的响应进行了分析,并与单独混凝土SATWE计算结果和单独钢结构MIDAS计算结果进行了量化比较,结果表明钢结构对混凝土结构的影响较小,主体结构可以单独设计,而混凝土结构对钢结构的影响较大,若钢结构单独设计,偏于不安全。采用弹塑性静力分析法分析了混凝土结构在罕遇地震作用下的变形能力,结果满足规范要求。采用弹塑性时程法分析了罕遇地震作用下钢架的变形和塑性铰分布状态,结果表明在大震作用下钢架仍有强度和变形储备能力;同时还对钢架进行了整体稳定分析,结果表明钢架以整体稳定性为安全控制因素,且体系稳定设计满足强屈比与延性性能目标。

The eastern of Tangshan Children＇s Palace is a complicated building, mixed with concrete and steel frame. Its south part of the concrete structure is connected with the fall sloping steel frame. The earthquake response spectrum and elastic-plasticity analysis are carried on in the structure with MIDAS software, and a quantization comparison is made with SATWE. The result shows that the concrete part has serious influence on the steel frame. If the steel structure is designed separately, the result will be unsafe. The deformation capacity and the plastic hinge distribution of steel frame under the condition of rarely earthquake sufficient are carried with Pushover static elastic-plasticity analysis, and its result shows that the steel frame has sufficient capability of strength and deformation. A stability analysis is carried on the steel frame, and the overall stability is the control factor of steel frame. The system stability design could meet the requirement of the ductility and the ratio between strength and yield strength.