异形柱结构抗侧移刚度的分析

Study on Lateral Stiffness of Special Shaped Column Structure

目的研究异形柱结构在水平荷载作用下的内力和位移性能,评价该结构体系的抗震能力.方法应用平截面基本假定,从力学平衡及变形协调出发,讨论了异形柱在水平荷载作用下的受力性能,按"层模型"对该结构抗侧移刚度进行了理论研究,并和有限元的数值解作了分析比较.结果推导出了该结构体系抗侧移刚度的理论公式.研究结果表明,该结构体系在水平荷载作用下具有明显的双向耦合效应.结论《混凝土异形柱结构技术规程》对该结构两个方向分别单独进行抗震验算和位移验算,是偏于不安全的,其抗侧移刚度较按抗弯刚度等效矩形柱削弱达50%以上.

In order to analyse internal force and displacement of reinforce concrete structure with special shaped columns under level load, and to assess the seismic performance, the behavior of reinforce concrete structure with special shaped column is discussed from mechanics principle based on the plane assumption. From ＂story shear model ＂,lateral stiffness of structure with special shaped column is derived;Theory solution and FEM solution about lateral stiffness of structure with special shaped column are compared. The resuits show that the lateral stiffness of structure with special shaped column is weaker than the equivalent rectangular column, and it is not secure to seismic design based on the date code. The conclusion can be used in engineering practice.