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| The strut-and-tie mode for shear performance of a RC frame internal joint based on crack distribution |
| DONG Junhong1,YANG Hong1,2,ZHAO Wentong1 |
1.College of Civil Engineering, Chongqing University, Chongqing 400045, China;
2.Key Laboratory of New Technology for Construction of Cities in Mountain Area,Ministry of Education, Chongqing University, Chongqing400045, China |
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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.
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Received: 29 June 2018
Published: 15 December 2019
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