巨型型钢混凝土柱双向偏心受压校核分析方法

利用ETABS截面设计器对某超高层建筑巨型型钢混凝土柱截面进行了双向偏心受压校核分析.首先由ETABS截面设计器得到构件截面相关曲线数据,通过编制的拟合及绘图程序采用空间相关曲面法对构件进行校核分析,针对空间相关曲面法的不足进一步提出了等效平面相关曲线法加以改进.等效平面相关曲线法基于映射原理将空间相关曲面转换成等效平面相关曲线,同时将空间内力点转换成等效内力点,方法直观简便,可在一个图形中给出各工况的校核结果,并且能定量地给出构件受力的安全程度.最后,以一个巨型型钢混凝土柱截面为例给出了等效平面相关曲线法的校核结果,对比了考虑型钢作用及不考虑型钢作用两种情况对巨型柱受力性能的影响.文中提出的方法可为类似工程和建筑结构设计软件的开发提供借鉴.

A Check Analysis Method for Steel Reinforced Concrete Mega-column under Biaxial Eccentricity Loading

By using the Section Designer of ETABS,the mechanical behavior of steel reinforced concrete mega-columns with biaxial eccentricity in a super high-rise building was checked.Firstly,the data of correlation curve of members were gained by the Section Designer,and the space correlation curved face method was adopted to check the members through the developed fit and plot program.Then the equivalent plane correlation curve method was presented in order to solve the shortcomings of space correlation curved face method.Based on the mapping theory,the space correlation curved face was conversed into the equivalent plane correlation curve and the space internal force point into the equivalent internal force point.The proposed method is visual and simple and the checking results of all analysis cases can be plotted on a same figure,and the quantitative results of degree of safety can also be given.Finally,taking a steel reinforced concrete mega-column section as an example,the checking results of the equivalent plane correlation curve method were given.After the comparison whether or not to take account of steel jointly action in a specific example,the steel effects on the mechanical behavior of mega-column were clearly discussed.The method can be provided as a reference for engineering desingers and the development of structural design software.