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郑州银基中央广场项目包含两栋塔楼和裙房,采用了不设置永久结构缝的大底盘多塔结构形式,属复杂超限高层结构。高塔采用框架-钢筋混凝土核心筒结构体系,结合塔楼高区酒店和中、低区办公功能对柱网的不同需求,利用高区的设备转换层进行了外框柱网的转换,角部采用了折梁转换;由于低塔核心筒的高宽比达到15.7,为加强整体抗侧刚度,采用了框架+端墙/楼面梁+核心筒的抗侧结构体系。针对与端墙相连楼面梁的受力特点,对其进行了刚度敏感性分析以模拟不同地震水准下的刚度退化影响。并制定了区别于一般耗能构件的性能目标,即大震作用下,允许较大比例的连梁严重破坏耗能,并对连梁采取了防跌落构造措施。另外,对塔楼的基础设计及考虑变刚度调平的布桩方法、中震作用下核心筒外墙的拉应力分析及处理措施进行了论述。
Zhengzhou Yinji Central Plaza project consists of two towers and podium, using a large structure without permanent structural joints multi-tower structure, is a complex overrun high-rise structure. The tower adopts the frame-reinforced concrete core tube structure system. Combined with the different demands of the high-rise hotel and middle and low district office functions on the column net, the high-grade equipment conversion layer is used to convert the outer column net, and the corner is adopted Beam conversion; due to the low core tower aspect ratio up to 15.7, in order to enhance the overall lateral stiffness, using the framework of the end wall / floor beam + core tube anti-side structure system. According to the force characteristics of the floor beam connected with the end wall, the stiffness sensitivity analysis is carried out to simulate the effect of stiffness degeneration under different earthquake levels. And set a performance target that is different from the general energy-dissipating components. That is to say, under the action of a large earthquake, a large proportion of connecting beams is allowed to seriously damage the energy consumption, and a structural measure against falling of the connecting beam is adopted. In addition, the basic design of the tower and the piles adjustment method considering the variable stiffness are discussed, and the tensile stress analysis and treatment measures of the core tube outer wall under the moderate earthquake are also discussed.