基于SAP2000的框剪结构抗连续倒塌研究

Research on the Continuous Collapse Resistance of Frame-Shear Structure Based on SAP2000

利用SAP2000有限元软件,对一栋按照现行《混凝土结构设计规范》设计的24层钢筋混凝土(RC)框剪结构进行抗连续倒塌性能分析,采用非线性动力拆除构件法检验了高层RC框剪结构的抗连续倒塌能力。分析结果表明,在结构角柱附近布置剪力墙,可以有效提高结构的抗连续倒塌能力。同一楼层柱失效结构的连续倒塌概率长边中柱>中心柱>角柱>短边中柱。拆除结构角部L型剪力墙的Y向墙肢后,X向的墙肢可继续完成内力重分布与剩余结构有很好的空间拉结作用,并与Y向失效后剩余墙体相互约束,有效防止结构倒塌。而框剪结构与普通框架结构类似,不同楼层拆除任意相同位置构件,其连续倒塌概率随楼层的升高而增大。

Under the premise of using SAP2000 finite element analysis software,a 24-story reinforced concrete(RC)frame-shear structure designed in accordance with the current"Specifications for Design of Concrete Structures"was analyzed for the continuous collapse resistance performance.The nonlinear dynamic demolition method was used to test the continuous collapse resistance of high-rise RC frame-shear structure.The analysis results show that arranging shear walls near the structural corner columns can effectively improve the structure's ability to resist continuous collapse.The probability of continuous collapse of the column failure structure on the same floor is long-side center column>center column>corner column>short-side center column.After the Y-direction wall limbs of the L-shaped shear wall are removed,the X-direction wall limbs can continue to redistribute internal forces and have a good spatial tie-up effect on the remaining structure,and are mutually restrained with the remaining wall after the Y-direction fails,effectively preventing the structure from collapsing.The frame-shear structure is similar to the ordinary frame structure.If any component at the same position is removed from different floors,the continuous collapse efficiency increases with the rise of the floor.