钢纤维掺量和轴压比对预应力扁梁框架力学性能的影响  

INFLUENCE OF STEEL FIBERS AND AXIAL COMPRESSION RATIO ON MECHANICS BEHAVIOR OF PRESTRESSED WIDE-BEAM FRAME

作　　者：郑建岚[1] 陈亚亮[2] 

机构地区：[1]福州大学土木工程学院,福建福州350002 [2]福建省建筑科学研究院,福建福州350002

出　　处：《工程力学》2007年第6期59-67,共9页Engineering Mechanics

基　　金：国家自然科学基金资助项目(50278019)

摘　　要：利用ABAQUS非线性有限元分析研究钢钎维掺量和轴压比对无粘结预应力混凝土扁梁框架受力性能的影响。有限元模型中混凝土采用塑性损伤模型,考虑了钢纤维对混凝土本构关系的影响,同时采用弹簧单元模拟钢筋与混凝土间的粘结滑移作用。算例表明,采用本文的方法进行钢纤维预应力扁梁框架力学性能研究是可行的。在此基础上,分析不同钢纤维掺量和柱轴压比对无粘结预应力扁梁框架力学性能的影响。研究表明,较大的轴压比可以提高结构极限承载力,但降低结构延性和耗能,对于无粘结预应力扁梁框架,建议在抗震地区其轴压比限制不宜大于0.6。钢纤维可以有效提高预应力扁梁框架的极限承载力、延性和耗能,从而提高其抗震性能,其影响与轴压比的大小有关。Nonlinear finite element analysis was carried out to fiber-reinforced unbonded-prestressed wide-beam frames using the ABAQUS program, influence of steel fibers and axial compression ratio on mechanics behavior was discussed. The concrete damaged plasticity model was used during the analysis, contribution of steel fibers to nonlinear behavior of concrete is considered. Effects associated with the rebar/concrete interface were modeled as spring element to simulate the bond slip action. It was proved to be feasible to carry out the analysis using the materials and elements providing in ABAQUS program. The influences of steel fibers and axial compressing ratio on the mechanics behavior of prestressed wide-beam frame were investigated. The results show that the large axial compressing ratio can promote the ultimate loading capacity, but reduce the ductility and energy dissipation. Limitation on axial compressing ratio was advised for prestressed wide-beam frame in earthquake region. Steel fibers could effectively improve the ultimate loading capacity, ductility and energy dissipation, thus contributed to improving the seismic behavior of wide-beam frames. The effect of steel fibers is related with axial compressing ratio.

关 键 词：钢纤维 轴压比 扁梁框架 非线性 有限元分析 

分 类 号：TU394[建筑科学—结构工程]