基于损伤模型的钢筋混凝土梁剪切破坏全过程分析任晓丹.pdfVIP

文章编号：CSTAM2016-P66-E0031 基于损伤模型的钢筋混凝土梁 剪切破坏全过程分析 任晓丹，范伟达 ( 同济大学土木工程学院，上海 200092) 摘 要：剪切破坏是钢筋混凝土梁的典型破坏形态，但迄今为止并未建立起较为准确的分析方法。本文尝试基于 混凝土弹塑性损伤本构关系和非线性有限元分析方法，对钢筋混凝土梁的剪切破坏全过程开展较为精细的数值模 拟研究，并对某剪切破坏梁试验与其数值模型的裂缝发展过程及力-位移曲线进行了对比分析。结果表明，本文 采用的方法能够较好地模拟钢筋混凝土梁在剪切破坏全过程中的整体非线性响应，并能够追踪梁中裂缝产生和发 展的全过程。本文模型将为钢筋混凝土构件剪切破坏研究提供一条可行的途径。 关键词：钢筋混凝土；损伤模型；非线性有限元；剪切破坏；混凝土开裂 DAMAGE MODEL BASED NUMERICAL STUDY FOR SHEAR FAILURES OF REINFORCED CONCRETE BEAMS REN Xiao-dan , FAN Wei-da (School of Civil Engineering, Tongji University, Shanghai 200092, China) Abstract: As an important failure pattern, the shear failure of reinforced concrete members still cannot be well captured by the current theory and methods. In the present work, the shear failure of a reinforced concrete beam is numerically investigated based on damage constitutive model of concrete and explicit nonlinear finite element method. Besides, aspects of the numerical result and the test result of a beam in shear are compared and discussed, including crack developing and load-deformation response. The results indicate that the proposed method could reproduce the salient feature of shear failure, and the crack patterns could be well tracked. The proposed method offers an alternate way to investigate the shear failure for reinforced concrete members. Key words: reinforced concrete; damage model; nonlinear finite element; shear failure; concrete crack 钢筋混凝土构件的剪切破坏问题一直是结构工程领域关心的核心问题，迄今为止并未得到妥善的解 决。现行的抗剪设计方法基本上都是取自于实验数据的下限拟合[1]，同时考虑构件受力形式的影响。而现 行的结构数值分析方法也较难得到钢筋混凝土构件剪切破坏的较