密肋复合墙体受剪性能试验研究及弹塑性数值分析  

Experimental study and elasto-plastic numerical analysis on shear behavior of multi-ribbed composite wall

作　　者：常鹏[1] 姚谦峰[1] 

机构地区：[1]北京交通大学土木建筑工程学院,北京100044

出　　处：《建筑结构学报》2010年第4期116-123,共8页Journal of Building Structures

基　　金：国家自然科学基金项目(50878021);十一五科技支撑计划项目(2006BAJ04A02-5)

摘　　要：密肋复合墙体是密肋结构中的重要受力构件,其作用是给结构提供必要的抗侧刚度并承受水平荷载作用。以9榀1/2比例密肋复合墙试件为对象进行试验研究,在保证墙体尺寸相同的条件下,依次改变轴压比、高宽比、框格数量等参数,较为系统地测试了各项设计指标对墙体受剪性能的影响。在分析试验结果的基础上,建立了带塑性铰刚架-斜撑计算模型,并基于MATLAB 6.5编写了弹塑性计算分析程序MRCS。构件中填充砌块、钢筋混凝土框格、隐形边框等采用了不同的杆系单元,考虑了杆端半刚性性能和刚域的影响,从而使结构的"开裂-屈服-失效机构形成"这一弹塑性全过程在计算中实现。经过对比,有限元计算结果与试验数据吻合较好,表明建立的计算模型及分析程序MRCS是可信的,可为密肋复合墙体的弹塑性全过程分析提供参考。Multi-ribbed composite wall can offer the structure a necessary lateral stiffness and withstand the horizontal loads,therefore is the important member in multi-ribbed slab structure.Through the 1/2 scale tests of 9 composite walls,several key design indexes are systematically studied with considering the axial compression ratio,the depth-width ratio,the number of ribs and other parameters.Based on the analysis of test results,a nonlinear model composed of tilted-brace and rigid-frame with plastic hinge is established.And an elastic-plastic analysis program,MRCS,is presented using MATLAB 6.5.Filled blocks,reinforced concrete sub-frames and main frames are taken as different elements in the program.Semi-rigid connections and rigid zones are considered in the analysis.Thus,a whole elasto-plastic response,cracking,yielding and failure can be simulated.The analysis shows that the finite element calculation results correlated with the experimental data quite well,which indicate that the establishment of the calculation model and analysis procedure MRCS is reasonably reliable.The proposed model and method can provide analytical support to the whole elasto-plastic analysis on multi-ribbed composite wall.

关 键 词：复合墙体 拟静力试验 数值分析 承载力 破坏模式 弹塑性 

分 类 号：TU375[建筑科学—结构工程] TU313