特殊体型大跨度长悬臂新型结构体系创新与设计探讨

发布时间：2018-08-13 08:08

【摘要】：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。
[Abstract]:Taking a new type of long-span cantilever structure system with special shape and large span as the research object, the rationality of its structural system selection is discussed, and the aseismic performance target is determined and analyzed in detail. The calculation and analysis show that the key link of the establishment of the structure system is to set the reinforced concrete cylinder with reasonable force on the bottom floor, which can not only support the long span and long cantilever floor, but also play a powerful role in resisting the side. Mechanical characteristics of torsional stiffness and biaxial force. Two braced steel trusses are put forward to provide reliable supports for steel trusses located in edge span, so as to realize the architectural scheme that the bottom floor width is smaller than the upper floor width. The post-pouring construction measures are adopted to reduce the floor stress in the area of floor stress concentration. The stress concentration revealed in the finite element analysis of steel truss bearing joints can be solved by means of local axil. The results of large vibration elastoplastic analysis verify the rationality of the conceptual design of the structure, and each index can meet the requirements of the performance objectives.
【作者单位】：香港华艺设计顾问(深圳)有限公司;
【分类号】：TU973

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