考虑楼层刚度的伸臂结构力学性能

Mechanical Characteristics of Outrigger Structure Considering Floor Stiffness

针对带伸臂框架-核心筒的结构方案设计提出了一种考虑普通楼层刚度的简化计算方法,并将此方法与有限元模型计算结果进行对比.在此基础上对楼层数量、楼层刚度比、伸臂刚度比、伸臂跨度比及高跨比等参数影响规律进行分析,提出了考虑普通楼层刚度的等效核心筒刚度比计算公式,并分析对比了其对伸臂结构动力性能影响规律.结果表明:简化计算方法与有限元模型计算结果吻合较好,相对未考虑普通楼层刚度情况误差率减小20%;提出的等效核心筒刚度比公式能较好地估计普通楼层对整体刚度的贡献,能满足工程方案设计精度要求,且拟合的等效核心筒刚度比计算公式能简化结构动力分析,近似估计伸臂结构动力特性,为带伸臂框架-核心筒的结构动力分析提供简单的实用分析方法和理论依据.

A simplified calculation method considering the stiffness of ordinary floors was proposed in the de⁃sign of the frame-core tube structure with outriggers,and the results of this method is compared with Finite Element calculating results.Parametric analysis was conducted to evaluate the influences of various factors,such as the num⁃ber of ordinary floors,the stiffness ratio of ordinary floors,outrigger stiffness ratio,outrigger span ratio and height-tospan ratio.A mathematical formula to calculate the stiffness ratio of the equivalent core tube considering the stiffness of ordinary floors is proposed.And its influencing law on dynamic property of outrigger structures is also compared and analyzed.The results show that the simplified calculation model proposed in this paper can well repeat the re⁃sults of Finite Element model,the error rate can be reduced by 20%compared with the case without considering the ordinary floor stiffness.The proposed stiffness ratio formula of equivalent core tube can well reflect the contribution of ordinary floors to the overall structure stiffness,and meet the accuracy requirements of engineering scheme design.Moreover,the fitted stiffness ratio calculation formula of equivalent core tube can significantly reduce the computa⁃tional effort of dynamic analysis and approximately estimate the dynamic characteristics,providing a practical analy⁃sis method and theoretical basis for the dynamic analysis of outrigger system.