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A 2D beam-column joint macro-element for the nonlinear analysis of RC frames

机译：用于RC帧的非线性分析的2D光束柱关节宏元件

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摘要

Recent earthquakes have shown that the seismic behavior of noncode-conforming reinforced concrete buildings are in several cases strongly affected by the nonlinear response and possible failure of the beam-column joints. Beam-column joint inelasticity is typically due to either shear cracking and failure of the central concrete panel or bond-slip of the longitudinal steel bars. This paper proposes a new Joint with Hinges macro-element capable of simulating the most important sources of nonlinearities in the joints. It consists of a quadrilateral central panel whose rigid edges are connected to the beams' and columns' end nodes through nonlinear finite-length interfaces that represent the plastic hinge zones. The central panel deforms in shear only. The joint macro-element accounts for the nonlinear shear response of the central panel, for the bond-slip of the longitudinal rebars crossing the joint and for the nonlinear shear and flexural behavior of the plastic hinge zones of the beams and columns connected to the joint. The resulting model of the reinforced concrete frame is the assembly of nonlinear Joint with Hinges macro-elements connected by elastic frame elements. The proposed formulation is applied in this paper to plane frames. Validation studies with results from available experimental tests on beam-column joint subassemblages show the proposed model capability to predict the hysteretic responses and the failure mechanisms of connections with unreinforced joints and different beam reinforcement ratios.
机译：最近的地震表明，非代码符合钢筋混凝土建筑物的地震行为在几个案例中受到非线性响应和梁柱关节可能的可能性失效的几个案例。光束柱关节内弹性通常是由于中央混凝土板或纵向钢筋的粘结滑动的剪切裂缝和故障。本文提出了一种具有能够模拟关节中最重要的非线性源的铰链宏观元件的新关节。它由四边形中央面板组成，其刚性边缘通过表示塑料铰链区的非线性有限长度接口连接到光束'和列的终端节点。中央面板仅在剪切中变形。联合宏元件占中央面板的非线性剪切响应，对于穿过关节的纵向钢筋的粘结滑动和梁和柱的塑料铰链区域的非线性剪切和弯曲行为连接到连接到接头的柱子。钢筋混凝土框架的所得到的模型是非线性接头的组装与弹性框架元件连接的铰链宏元件。所提出的配方在本文中应用于平面框架。具有来自梁柱关节子组件的可用实验测试结果的验证研究表明，提出的模型能力，以预测与未合成的关节和不同光束增强比的连接的滞后响应和失效机制。

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