C15低强度混凝土中植筋的仿真计算及承载力折减研究

Simulating Calculation for the Planting-bar Technique in C15 Low Strength Concrete and Research on Bearing Capacity Reduction

国内外关于植筋技术的研究基本上是在较高强度混凝土基材上进行的,而实际工程中仍存在低强度混凝土结构用植筋技术加固的案例。本文利用大型有限元软件ANSYS10.0对C15低强度混凝土中植筋进行了非线性有限元分析,分析了不同荷载下基材和受拉钢筋应力分布的规律。得到了钢筋的荷载-应力曲线和荷载-滑移曲线;求出了三种常用钢筋的极限承载力;经过分析计算,得出了强度折减系数。结果说明,C15低强度混凝土中植筋是可行的,可以指导结构加固设计。

The research of planting-bar technique at home and abroad is basically for high strength concrete, but ？the actual engineering still exists the use of planting-bar technique in low strength concrete structure. In this paper, nonlinear finite element analysis of planting-bar in low strength concrete is carried out through finite element software ANSYS 10.0. The stress distribution rule of concrete and bar is analyzed under different loading. The loading-stress curve and loadingslip curve of bars are obtained. The ultimate bearing capacity of three common used bars is obtained, and the strength reduction coefficient of planting-bar is obtained through the calculation. The results show that using planting-bar technique in C15 low strength concrete is possible, which can guide the structure reinforcement design.