基于混凝土损伤模型的PC梁力学性能有限元分析  

Analyital study on mechanical properties of PC beams based on concrete damage plasticity

作　　者：马燚[1] MA Yi(Shenyang Construction Testing Center Co.,Ltd)

机构地区：[1]沈阳市建设工程质量检测中心有限公司,辽宁沈阳110016

出　　处：《混凝土》2018年第7期46-50,57,共6页Concrete

摘　　要：为了探明混凝土塑性损伤模型中有无损伤因子对无黏结预应力混凝土梁与有黏结预应力混凝土梁力学性能的影响,通过ABAQUS软件对以往两种预应力混凝土试验梁进行有限元数值模拟分析,选择适当单元、预应力筋与混凝土之间的接触讨论有无损伤因子对其力学性能影响分析,并将得出的力位移曲线与试验结果对比。结果表明:(1)两种有限元分析结果的PC梁初期刚度与试验结果基本一致,未考虑损伤因子的有限元模型最大承载力略大于试验结果,考虑损伤因子的有限元模型最大承载力略小于试验结果,但两种模型的最大承载力与试验结果相差不大,表明有限元分析建模是行之有效的;(2)从混凝土、普通钢筋以及预应力钢筋的应力分布来看,考虑损伤因子的模型无论无黏结PC梁还是有黏结PC梁,都更符合PC梁的实际受力状况。In order to verify the influence of the damage factors on the mechanical properties of unbonded PC beams and bonded PC beams in the plastic-damage constitutive model of concrete.Two pre-stressed concrete beams is carried out by using ABAQUS software.Select the appropriate material constitutive relationship and element type,then analysis of the effect of damage factor on mechanical properties of concrete constitutive relation.Finally,the force-displacement curve is compared with the experimental results.The results show（1）The initial stiffness of PC beam with two finite element analysis results is basically consistent with the test results.The maximum bearing capacity of the finite element model without considering the damage factor is larger than the test result.The maximum bearing capacity of the finite element model considering the damage factor is less than the test result.In view of the fact that the maximum bearing capacity of the two models is not much different from the experimental results,this method of modeling finite element method is feasible.（2）In view of the stress distribution of concrete,ordinary steel and prestressed steel,as long as the damage factor model is considered more in line with the actual PC beam stress,no matter unbonded PC beam or bonded PC beam.

关 键 词：预应力混凝土梁 混凝土本构关系模型 损伤因子 有限元数值模拟分析 力学性能 

分 类 号：TU528.01[建筑科学—建筑技术科学]