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

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Journal of Vibration and Shock ›› 2019, Vol. 38 ›› Issue (24) : 48-55.

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

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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.

Key words

beam-column joint / strut-and-tie model / shear deformation / finite element model / super joint element

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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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