双钢板-混凝土组合剪力墙变形特性的有限元分析  

Numerical Analysis of Deformation Performance of Steel-Concrete-Steel Composite Shear Walls

作　　者：武晓东[1] 童乐为[1] 薛伟辰[1] 

机构地区：[1]同济大学土木工程防灾国家重点实验室,上海200092

出　　处：《建筑钢结构进展》2017年第1期17-25,84,共10页Progress in Steel Building Structures

基　　金：国家自然科学基金(51038008)

摘　　要：建立了双钢板-混凝土组合剪力墙的精细化有限元模型,在模型中采用了基于断裂能和单元特征长度的混凝土应力-应变关系,有限元分析获得的墙体侧向力-侧向总变形关系、弯矩-曲率关系与已有的他人试验结果吻合较好。对曲率二次积分求得弯曲变形,将总变形分解为弯曲变形和剪切变形两部分。结果表明,破坏模式为弯曲控制的双钢板-混凝土组合剪力墙在加载过程中弯曲刚度和剪切刚度均有退化,其剪切变形不宜采用弹性方法计算,且剪切变形占总变形的比例在变形过程中基本上为常数。对剪切变形在总变形中所占的比例进行了参数分析,结果表明,剪跨比显著影响剪切变形的所占比例,轴压比的影响可忽略。最后,提出了该比例的实用计算公式。A finite element model for steel-concrete-steel（SCS）Composite shear walls is built in this paper. The stress-strain relationship of concrete is based on fracture energy and characteristic element size. The lateral load-displacement relationship and moment-curvature relationship obtained from finite element analysis agree well with the experimental results in literatures. The total deformation of shear wall is divided into flexural deformation and shear deformation. The flexural deformation is calculated by double integration of the curvature, while shear deformation is subtracted from the total deformation. It is concluded that both flexural stiffness and shear stiffness for flexure-dominated SCS composite shear walls are degraded in the loading process, which indicates shear deformation should not be included by elastic method. Moreover, the ratio of shear deformation to total deformation remains constant. Parametric study indicates that shear-span ratio has an important influence on the ratio of shear deformation to total deformation, but the influence of axial compression ratio may be ignored. At last, a practical formula for calculating the ratio of shear deformation to total deformation is proposed.

关 键 词：双钢板-混凝土组合剪力墙 有限元分析 曲率 弯曲变形 剪切变形 剪跨比 

分 类 号：TU398[建筑科学—结构工程]