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| Anti-collapse performance of beam-column substructures based on the composite effect of floor slabs |
| ZHONG Weihui1,2， TAN Zheng1， SONG Xiaoyan1， MENG Bao1， ZHENG Yuhui1 |
1.School of Civil Engineering, Xi’an University of Architecture and Technology, Xi’an 710055, China ;
2.Key Lab of Structural Engineering and Earthquake Resistance, Ministry of Education,Xi’an University of Architecture and Technology, Xi’an 710055，China |
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Abstract To investigate the failure mode and mechanical mechanism of steel frames under middle column removal scenario, a composite beam-column substructure with bolt and weld rigid connections,being comprised of three columns and two beams, was selected as the research object to conduct monotonic static loading tests.The test results show that the tension flange at the beam end near the failure column fractures first, and the cracks continue to develop upward until the web fractures.The specimen can provide higher resistance in large deformation stage than in the previous bending stage due to the synergistic effect.In addition, a detailed finite element model was established and validated by test results.On this basis, the influence of the peripheral components′ constraints on the anti-collapse performance of the assembly was assessed.The results show that the anti-collapse resistance of the beam-column substructure will be improved by the increase of peripheral components′ constraints.When the constraints provided by peripheral components exceed the critical value, it will have only little effect on bearing capacity against progressive collapse.The anti-collapse resistance of specimens with and without floor slabs were analyzed by a full-scale model.The results show that the peak bearing capacity due to the flexural mechanism of the specimen with floor slabs is increased by 42.0% and that due to the catenary mechanism by 49.9% compared with the specimen without floor slabs.It shows that the composite effect of floor slabs can significantly improve the bearing capacity of the structure by both the flexural mechanism and catenary mechanism.The dynamic response curves of the structure were obtained based on the principle of energy balance.The comparison shows that the existence of floor can make the structure own relatively rich strength redundancy under dynamic load.
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Received: 19 September 2019
Published: 28 May 2021
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