基于混凝土强度随机性的钢筋混凝土梁裂缝开展模拟

Simulation on Development of Crack in Reinforced Concrete Beam Based on the Randomness of Concrete Strength

本文提出一种基于混凝土强度随机性的钢筋混凝土构件裂缝开展模拟方法。该方法定义混凝土抗拉强度满足正态分布,加载过程中通过对混凝土单元的实时拉应力与预先定义的抗拉强度进行比较,确定混凝土是否开裂及裂缝开展情况。首先通过数值模拟对其可行性进行验证,之后通过模型试验对其在裂缝高度识别方面的应用进行有效性验证。数值模拟及模型试验验证的结果表明,基于混凝土强度随机性的钢筋混凝土构件裂缝开展模拟方法是可行的且其用于钢筋混凝土梁裂缝高度识别是有效的。

This paper proposes a method of simulation on development of crack in reinforced concrete component based on the randomness of concrete strength. In this paper,the tension strength of concrete is considered as following Gaussian distributions. During every level of loading,the cracking and crack's development of concrete are identified through comparing the real-time tension stress of concrete element with the pre-defined tension strength and deleting the element whose tension stress reaches to its tension strength. The feasibility of the proposed method and its application in identification of crack depth are verified by numerical simulation and model test. The results show that the proposed method is feasible and its application in identification of crack depth is effective.