Seismic Performance Of Assembled Concrete Structures With Hanging Slabs And Columns

Concrete frame structure with fully assembled wall composited by hanging slabs and columns is a new structure system whose main structure is composed by precast beams, columns and superimposed slabs. The formation process is mounting the concrete keel columns on the main structure skeleton firstly and then mounting the external hanging slabs on the keel columns. To make the structure properties of prefabricated concrete structure be good as cast-in-place concrete frame structure, designing reasonably the connection forms and properties between prefabricated members and arranging shock absorbers in prefabricated concrete structures are two kinds of common solutions. Because mainly focusing on the component level to ensure the seismic performance and expensive cost, the two solutions are difficult to implement. The new assembly structure system introduces technological innovation, gives full play to the advantages of the assembly structure to further improve and enhance the seismic performance of prefabricated concrete structures from the structure itself, which has important theoretical and engineering significance.First, mechanical models on fully assembled wall composited by hanging slabs and columns and joints were analyzed and the hysteretic model of joints in the structure was created. By the comparison of the results of FEM and experiment, the accuracy of the hysteretic model of joints was verified in an actual project after simplifying the entire wall model to be bracing model.After that, on the basis of a scale model, by shaking table test, changes of dynamic characteristics before and after the earthquakes of different levels were analyzed; Acceleration response and displacement response under the earthquakes of different levels were analyzed; The seismic response of the wall and the seismic effect of the external hanging slabs were studied that provided the basis for improving the seismic capacity of the fasteners on the hanging slabs; Destruction degrees and shape of the test structure under the earthquakes of different levels were studied to evaluate reasonably the seismic performance.Based on theoretical research and experimental research, nonlinear time history analysis of a three-layer concrete frame structure with fully assembled wall composited by hanging slabs and columns was implemented by the finite element program ABAQUS to analyze the variation of dynamic characteristics, displacement response, story drift and lateral stiffness. Finally, after the comparison of seismic performance between concrete fasteners and steel fasteners by numerical simulation, concrete fasteners were replaced by steel fasteners to improve the seismic performance of the assembled wall.