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以一种特殊体型大跨度长悬臂新型结构体系作为研究对象,对其结构体系选型的合理性进行讨论,确定抗震性能目标并进行详细的计算分析。计算分析表明,结构体系成立的关键环节是在底部楼层设置受力合理的钢筋混凝土筒体,筒体不但能起到支承大跨度和长悬臂楼层的作用,而且可发挥强大的抗侧、抗扭刚度和双向受力的力学特征。创新地提出增设2榀支撑钢桁架,为位于边跨的钢桁架提供可靠支座,以实现底部楼层宽度小于上部楼层宽度的建筑方案造型。对楼板应力集中区域采用后浇的施工措施降低楼板应力。钢桁架支座节点有限元计算分析中揭示的应力集中可通过局部加腋方式予以解决,对中震偏拉墙肢须予以针对性地加强。大震动力弹塑性分析结果验证了结构概念设计的合理性,各项指标均能满足性能目标要求。
Taking a special long-span long-span special structural body as the research object, the reasonableness of the structural system selection is discussed, the seismic performance target is determined and the detailed calculation and analysis are carried out. The calculation and analysis show that the key to the establishment of the structural system is to set up a reasonable reinforced concrete cylinder on the bottom floor. The cylinder can not only support the large-span and long-cantilever floors, but also exert powerful anti-side, Stiffness and mechanical properties of two-way force. Innovatively proposed to add 2 榀 support steel truss to provide reliable support for the steel truss located at the side of the cross in order to achieve the width of the bottom floor is less than the width of the upper floor of the architectural design. On the floor stress concentration area after pouring construction measures to reduce the floor stress. The stress concentration disclosed in the finite element analysis of the steel truss support node can be solved by local plus axillary method, which should be strengthened in a targeted manner. The results of the elasto-plastic analysis of the large-scale earthquake force verify the rationality of the conceptual design of the structure, and all the indexes can meet the performance target requirements.