海原博物馆上下部结构协同工作性能研究

Research on the coincident work between upper steel structure and lowe rconcrete structure of Haiyuan Museum

为探讨大跨空间结构中采用上部钢结构-下部混凝土结构组合体系的钢-混凝土结构的共同工作模式,以拟建工程海原博物馆为算例,分别建立仅上部钢结构模型和钢-混凝土结构整体模型,并分别对两模型进行了静力分析、小震作用弹性分析、大震作用动力弹塑性时程分析。此外,在罕遇地震下,还探讨了混凝土结构的弹塑性性质对整体结构的影响。结果表明,在静、动力作用下,采用共同工作模式能够极大地提高结构的位移、内力等性能指标。在设计分析时,不能忽视下部结构支承作用的放大效应;在罕遇地震作用下,考虑下部混凝土弹塑性影响后会减弱结构的地震响应。

In order to investigate the joint work pattern of upper steel part and lower supporting concrete part,the example of Ningxia Haiyuan Museum was adopted to build finite element models for upper steel structure only and steel-concrete structure.And a further analysis for the models was done in terms of statistic analysis,elastic analysis under frequent earthquake and dynamic elasto-plastic time history analysis under immediate earthquake.Besides,the influence of concrete structure’s elasto-plastic property to the whole structure under rare earthquake was discussed.The results show that the joint work pattern can improve the performance of the structure such as increasing displacement and internal force considerably.Moreover,the magnification effect of the lower structure’s supporting action can not be ignored in design.And the seismic response of the structure will be declined if the elasto-plasticity of the low-part concrete under rare earthquake is taken into account.