Study of concurrent multi-scale simulation method and dynamic response for precast concrete frame structure
In order to maximize the accuracy of finite element analysis of precast concrete frame structures with limited computational resources as well as analyze the local damage characteristics and the overall structural response simultaneously,a concurrent multi-scale simulation method for precast concrete frame structures was proposed.The interface contact problem between new and old concrete was taken into account on the basis of the cohesive model and the interface connection of multi-scale model was realized by multi-point constraints method.The rationality of the simulation method was verified by comparing with the test of precast concrete beam-column joint.Besides,the reasonable value range of the fine-scale of precast concrete frame joint region was obtained by parameter analysis.Finally,the dynamic response of a precast concrete frame structure under seismic action was analyzed using the proposed concurrent multi-scale simulation method.The results show that the coupling interface of different scale models should be taken outside the interface between new and old concrete,and it is recommended that the length should be h/3-h(hi is beam height),and at least 1/2 of the grouting sleeve length should be left from the end of the grouting sleeve.The response of the structure obtained by the concurrent multi-scale simulation method shows advantages in simulation precision and can reflect true plastic development law of the joint compared with the macroscopic beam element.The proposed concurrent multi-scale simulation method can provide an effective approach for the overall analysis of complex precast concrete structures and the precise simulation of key joints.
万方数据
维普
