钢筋混凝土梁非线性有限元静力分析

Nonlinear Analysis of the Finite Element of a Reinforced Concrete Beam

借助有限元软件ANSYS,对钢筋混凝土简支梁在单调竖向荷载作用下进行受力全过程非线性计算,对超筋梁和适筋梁,提出分别以混凝土的极限压应变达到εcu和受拉钢筋的极限拉应变达到0.01作为达到极限承载力的判别标准;分析钢筋混凝土梁完整的破坏过程、力学特征,研究受压钢筋、配筋率和材料强度对梁极限承载力的影响,数值分析得出应用高强、高性能钢筋能提高资源利用效率,即截面承载力显著提高的同时,钢筋混凝土构件的延性并未降低等结论。

In order to make up the shortcoming of test teaching for civil engineering specialty at present, the completed elasto-plastic analysis is carried out for a simple reinforced beam under monotonic vertical load by using software ANSYS. It is presented as tire judgment criterion for the limit bearing capacity that the limit compressive strain of concrete reaches εcu, and the limit tensile strain of steel bars reaches 0. 01 for beams with over limit reinforcement ratio or appropriate reinforcement ratio, respectively. Then the whole failure process and characteristic for the beam are analyzed and the main influence factors are studied. Finally some conclusions are attained such as steel bars with higher strength and higher performance can improve the value in resource efficiency, which can improve the bearing capacity of section, but tire dt,etility of reinforced concrete member will not reduce yet. Therefore the application of steel bars with higher strength and higher performance will be rational and feasible.