特殊体型大跨度长悬臂新型结构体系创新与设计探讨  

Discussion on innovation and design of large-span & long-cantilever new structural system with special shape

作　　者：张伟 周坚荣 徐静 刘俊 高义奇 

机构地区：[1]香港华艺设计顾问(深圳)有限公司,深圳518026

出　　处：《建筑结构》2017年第21期1-6,共6页Building Structure

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。A new type of large-span long-cantilever structure with special shape was studied. The rationality of the structural system selection was analyzed,and seismic performance objectives were identified and analyzed in detail. The calculation and analysis show that the key link of the structural system is setting the reasonably mechanical reinforced concrete tube at the bottom floor,because the tube can play the role of supporting large-span and long-cantilever floor,but also exert its strong lateral,torsional stiffness and two-way mechanical characteristics. Two additional pieces of supporting steel truss in the tube were proposed,which provide reliable support for the side span steel truss,to realize the building elevation scheme of the bottom floor width less than the width of the upper floor. The post pouring construction measures were adopted to reduce the floor stress in the stress concentration area of the floor. The stress concentration issue in the finite element analysis of the steel truss support joints could be solved by the method of setting local haunch. Under fortification earthquakes,the eccentric wall of the earthquake should be strengtheed. The rationality of structural conceptual design was verified by the dynamic elastic-plastic analysis under rare earthquakes,and all indicators could meet the performance requirements.

关 键 词：钢桁架 长悬臂 钢筋混凝土筒体 应力集中 偏心受拉 

分 类 号：TU318[建筑科学—结构工程]