不含预设裂缝的钢筋混凝土梁的数值仿真

发布时间：2018-06-06 13:25

本文选题：桥梁工程 + 四点弯曲　；参考：《重庆交通大学学报(自然科学版)》2014年06期

【摘要】：设计了一种不含预设裂缝的钢筋混凝土适筋梁,在承受四点弯曲的作用下,通过非线性和XFEM有限元算法进行了仿真计算。两种方法对于适筋梁的计算结果都是有效的,非线性结果应力变形的变化符合材料的本构关系;基于XFEM的计算更接近于真实情况。尝试了对不含预设裂缝钢筋混凝土梁的模拟,即在断裂力学的判断准则下裂缝的数量和位置都是随机的;在混凝土开裂后裂缝的扩展趋势与实际情况符合并且梁在最终破坏时受拉钢筋和受压钢筋全部达到拉压极限,与适筋梁的设计要求相符。
[Abstract]:A kind of reinforced concrete beam with suitable reinforcement without preset cracks is designed and simulated by nonlinear and XFEM finite element method under the action of four-point bending. The two methods are effective for the calculation results of beams with appropriate reinforcement. The variation of stress and deformation in nonlinear results is in accordance with the constitutive relation of materials, and the calculation based on XFEM is closer to the real situation. The simulation of reinforced concrete beams without preset cracks is attempted, that is, the number and location of cracks are random under the criterion of fracture mechanics. The crack propagation trend after the cracking of concrete is consistent with the actual situation and the tensile and compressive steel bars all reach the limit of tension and compression when the beam is finally destroyed, which is in line with the design requirements of the beam with appropriate reinforcement.
【作者单位】：盐城工学院土木工程学院;
【基金】：住房和城乡建设部项目(2013-K4-41) 江苏省科技厅项目(BY2013057-05)
【分类号】：U441;U448.34

【共引文献】