混凝土框架顶层边节点抗剪强度预测方法

Prediction Method of Shear Strength of Top Edge Node of Concrete frame

采用当前方法对混凝土框架中顶层边节点对应的抗剪强度进行预测时,所用预测时间较长,得到的预测强度与实际强度之间的误差较大,存在预测效率低和预测误差大的问题。为此提出混凝土框架顶层边节点抗剪强度预测方法。采用Darwin-Pecknold正交异性本构模型分析混凝土的本构关系和力学性能,根据分析结果计算存在空载正交梁的混凝土框架顶层边节点的抗剪强度,实现对节点在混凝土框架中抗剪强度的预测。仿真结果表明,所提方法的预测效率高、预测误差小,说明运用该方法对节点抗剪强度预测得出的结果,对提高混凝土框架结构的抗震延性、可靠度以及整体性有着重要作用。

When the current method is used to predict the shearing strength of edge node at the top of concrete frame,the prediction time is long,and the error between the predicted strength and the actual strength is large,lead-ing to low prediction efficiency and large prediction error.Therefore,a method to predict the shearing strength of edge node at the top of concrete frame was proposed.The constitutive relation and mechanical properties of concrete were analyzed by Darwin-Pecknold orthotropic constitutive model.Based on the analysis results,the shearing strength of edge node at the top of concrete frame with no-load orthotropic beam was calculated.According to this value,the shearing strength of node in concrete frame was predicted.Simulation results show that the prediction effi-ciency of the proposed method is high and the prediction error is small.The prediction result shows that this method plays an important role in improving the seismic ductility,reliability and integrity of concrete frame structure.