高温后HSC粘结滑移基础参数测量与3D有限元数值模拟
发布时间：2018-12-29 20:54
【摘要】：通过自行设计的装置测量了高温后粘结问题中的化学胶结力和摩擦系数,得出了它们随温度经历的变化规律。利用测得的基础参数定义了钢筋与混凝土界面的弹塑性库仑摩擦准则并将其植入有限元模型;采用面-面接触的接触单元模拟混凝土与钢筋界面的力学行为。模型通过对钢筋肋的显式离散实现了钢筋肋与混凝土间机械咬合作用的模拟。数值结果和试验数据的对比表明,该文提出的模型可以较好的模拟高温后带肋钢筋和混凝土之间的粘结滑移。最后,利用有限元模型对400℃温度经历拔出过程中的应力分布及裂缝的扩展进行了细致的研究。
[Abstract]:The chemical bonding force and friction coefficient of the bonding problem after high temperature were measured by a self-designed device, and the variation law of them with the temperature was obtained. The elastic-plastic Coulomb friction criterion of the reinforced concrete interface is defined and implanted into the finite element model by using the measured basic parameters, and the mechanical behavior of the interface between concrete and steel bar is simulated by the contact element with plane to plane contact. The model simulates the mechanical bite between reinforcement rib and concrete by explicit discretization of reinforcement rib. The comparison of numerical results and experimental data shows that the proposed model can well simulate the bond-slip between ribbed bars and concrete after high temperature. Finally, the stress distribution and crack propagation during the pull-out process at 400 鈩，
本文编号：2395385
[Abstract]:The chemical bonding force and friction coefficient of the bonding problem after high temperature were measured by a self-designed device, and the variation law of them with the temperature was obtained. The elastic-plastic Coulomb friction criterion of the reinforced concrete interface is defined and implanted into the finite element model by using the measured basic parameters, and the mechanical behavior of the interface between concrete and steel bar is simulated by the contact element with plane to plane contact. The model simulates the mechanical bite between reinforcement rib and concrete by explicit discretization of reinforcement rib. The comparison of numerical results and experimental data shows that the proposed model can well simulate the bond-slip between ribbed bars and concrete after high temperature. Finally, the stress distribution and crack propagation during the pull-out process at 400 鈩，
本文编号：2395385
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