超高层结构伸臂桁架安装时序分析与控制方法

Analysis and control method of optimum scheduling of outrigger-brace installation for super high-rise buildings

以深圳京基金融中心为原型,对Z形和V形两种典型伸臂桁架进行多种安装方案分析,研究单个伸臂桁架随施工进展的附加内力发展规律及其不同安装时序时的相互影响。结果表明,在任意确定的施工段内,不同连接方案下单个伸臂桁架附加极值应力发展规律基本不变,多个伸臂桁架的影响结果可由各自影响结果叠加得到,且安装时彼此之间相互影响很小。最终给出伸臂桁架连接时刻与最大附加应力关系曲线,给出以附加应力为控制目标的合理安装时序分析控制方法,并通过算例验证方法的有效性。最后,通过京基金融中心伸臂桁架安装全过程监测,验证理论分析的可靠性,相关控制分析方法可用于同类超高层结构伸臂桁架合理连接时序的确定,指导施工过程。

Different installation scheme for the Kingkey Financial Centre was analyzed to study the additional stress of two types of outrigger-braces. The additional stress developing rules with the construction progress of single outriggerbrace and the interaction of additional stress in different outrigger-braces with different installation schedule is studied.The analysis results show that additional stress developing rules of single outrigger-brace is same in any construction phrase even if it is installed in different schedule. The effect of other outriggers to some outrigger-brace could be obtained by adding the effect of every other outrigger-brace to the outrigger-brace,and the influence between different outriggerbraces is very small. The curves of maximum additional stress versus connection time of the outrigger-brace are obtained.The optimum scheduling method of outrigger-brace installation with the additional stress as control objective is proposed and verified by a numerical example. The field monitoring of outrigger-brace construction of Kingkey Financial Centre was implemented. The numerical analysis results agree well with the monitoring results,which proves the feasibility and the validity of the method. The proposed method can be used to guide the outrigger-brace installation of similar super high-rise buildings.