基于裂缝分布特征的RC框架中间节点受剪性能计算拉压杆模型

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振动与冲击 ›› 2019, Vol. 38 ›› Issue (24) : 48-55.

论文

董俊宏1，杨红1,2，赵雯桐1

作者信息 +

The strut-and-tie mode for shear performance of a RC frame internal joint based on crack distribution

DONG Junhong1,YANG Hong1,2,ZHAO Wentong1

Author information +

文章历史 +

摘要

大量钢筋混凝土梁柱组合体抗震性能试验表明，梁柱节点剪压比较大时核心区混凝土在受力后期一般将出现明显的非线性剪切变形。采用有限元方法模拟节点的受力规律时，正确计算节点区的剪应力-剪应变关系是有限元模型合理、非线性变形计算结果准确、可靠的基础和前提；基于梁柱组合体试验中节点裂缝的发展过程和分布规律，提出了一种基于裂缝分布特征的拉压杆模型，推导了相应的剪应力-剪应变骨架曲线的计算方法；在OpenSees软件中的超级节点单元的基础上，将节点的剪应力-剪应变骨架曲线的计算结果用于多个典型梁柱组合体抗震试验的有限元模拟分析之中。通过将节点剪切块的剪应力-剪应变滞回曲线、梁端力-位移滞回曲线的模拟结果与试验结果进行比较，验证了该模型的适用性和有效性。

Abstract

A large number of reinforced concrete beam-column subassemblage seismic experimental results indicate that under high shear compression ratio, beam-column joint concrete may generate obvious nonlinear shear deformation at the later stage of loading.When utilizing finite element methods to simulate the mechanics performance of a joint, correct calculation for stress-strain hysteretic curve is the base or precondition for reasonable finite model or nonlinear deformation calculation.Based on the development and distribution of joint cracks in beam-column subassemblage seismic experiments, a crack-based strut-and-tie model and a method for calculating the shear stress-strain skeleton curve were proposed.Based on the super joint element (beam-column joint element) in the OpenSees software, the simulation results of the model were used in the finite element analysis of the seismic tests of several typical beam-column subassemblages.By comparing the simulation results of joint shear block shear stress-strain hysteresis curves, load-displacement hysteresis curves at the beam end with that of the test results, the applicability and effectiveness of the crack-based strut-and-tie model was verified.

导出引用

董俊宏1，杨红1,2，赵雯桐1. 基于裂缝分布特征的RC框架中间节点受剪性能计算拉压杆模型[J]. 振动与冲击, 2019, 38(24): 48-55

DONG Junhong1,YANG Hong1,2,ZHAO Wentong1. The strut-and-tie mode for shear performance of a RC frame internal joint based on crack distribution[J]. Journal of Vibration and Shock, 2019, 38(24): 48-55

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