利用无网格方法分析斜拉破坏钢筋混凝土梁  

Analysis of RC beam failure in diagonal tension with meshless method

作　　者：陆新征[1] 江见鲸[1] 

机构地区：[1]清华大学土木工程系,北京100084

出　　处：《计算力学学报》2004年第6期701-705,共5页Chinese Journal of Computational Mechanics

基　　金：国家自然科学基金(59938180)资助项目.

摘　　要：从传统的混凝土分离裂缝模型和弥散裂缝模型出发,使用不同的模型模拟不同发展阶段的混凝土裂缝,并利用无网格方法可以灵活布置节点和边界的优点,使分离裂缝模型的使用得到很大的简化。通过在宏观裂缝表面布置基于试验结果的混凝土与混凝土界面单元,正确地模拟了裂缝表面抗剪能力的变化。算例表明,使用本文方法可以准确模拟斜拉破坏混凝土梁的破坏过程,且精度和数值稳定性要高于传统的有限元弥散裂缝方法。The cracks in concrete are modeled with different crack models according to their development degrees. Thus, smeared crack model is used for micro-cracks, while discrete crack model is used for macro-ones. The simulation of macro-cracks is simplified with the meshless method, since there is no element mesh needed in it. The shear-resist capacity on macro-cracks surface is estimated correctly by installing interlock elements on the surface, whose constitutive relationships are set-up based on test results. The numerical example shows that this method can simulate the damage process of RC beam failure in diagonal tension. And their precision and numerical stability are higher than those from the traditional finite element method with smeared cracks model.

关 键 词：无网格 斜拉 裂缝 剪力传递系数 

分 类 号：O242.2[理学—计算数学]