Finite Element Analysis Of Dynamic Response Of Outer Wall Of Prefabricated Sandwich Insulation Wall

As the country vigorously promotes the design requirements of prefabricated concrete buildings and green energy conservation of buildings,precast concrete structures are increasingly used in the construction industry,the prefabricated concrete sandwich thermal insulation wall integrates structure,thermal insulation and decoration,it has been widely promoted in prefabricated buildings,which conforms to the development trend of building assembly and energy conservation in the future,and the connecting parts as key components in the precast sandwich insulation wall play a vital role in the structural performance of the wall.At present,the relevant research on prefabricated sandwich insulation wall mainly focuses on the prefabricated structure connection process,steel sleeve grouting connection and static test,etc.,and the relevant research on the connection mainly focuses on the style,material and arrangement of the connector,etc.,and the finite element analysis of the prefabricated concrete structure is mainly modeled and analyzed in the same way as cast-in-place concrete.In view of the above situation,this paper mainly uses ABAQUS software to refine the modeling of ordinary prefabricated walls and prefabricated sandwich insulation walls,and analyzes the dynamic time history of the walls to study the dynamic response of the walls under different ground movements.The main research contents are as follows:(1)Referring to the relevant tests of precast concrete walls with horizontal joints and vertical joints,the finite element model of the wall was established,and the accuracy of the finite element modeling method was verified by parameter analysis.(2)Based on the test results of the mechanical properties of the joints measured by the research group,the finite element numerical simulation was carried out and verified the relevant mechanical properties of the Y-type GFRP connectors in the prefabricated sandwich insulation wall.(3)Based on the finite element numerical simulation results of prefabricated walls and connecting parts with horizontal joints and vertical joints,the acceleration dynamic time history analysis of ordinary prefabricated walls and prefabricated sandwich insulation walls with different insulation board thicknesses was carried out,and the acceleration dynamic response of inner and outer leaf walls and the stress changes of connecting parts in the prefabricated sandwich insulation wall were comparatively analyzed.According to the analysis of the above research content,the following conclusions are drawn:(1)When the friction coefficient is 0.8,The numerical simulation results of precast concrete wall are basically consistent with the test results,and the finite element numerical simulation of the precast concrete wall with horizontal and vertical joints can be carried out using the modeling method and related parameters of the finite element model.(2)The finite element simulation results of GFRP connectors are less than the experimental measurement results,and meet the relevant requirements in the corresponding specifications,it can be considered that the force performance of the connections in the prefabricated sandwich insulation wall can meet the design requirements under various working conditions,and the finite element numerical simulation results are basically consistent with the actual bearing capacity calculation results of the connectors.(3)The nonlinear dynamic time-history analysis results of high-rise building structures show that the maximum acceleration amplification coefficient of the floors decreases gradually with the increase of the number of floors when the acceleration peak value of the local seismic wave is the same.When the number of floors of the structure is the same,the maximum acceleration amplification coefficient of the floors gradually decreases with the increase of the peak acceleration.(4)Different types of seismic waves have little influence on the stress change of the connector.The maximum stress of the connector in the prefabricated sandwich insulation wall decreases gradually with the increase of the thickness of the insulation board.(5)Under the action of EL-Centro seismic waves and B-WSM seismic waves,the acceleration response of the wall is obvious,however,under the action of DZC seismic wave,the acceleration response of the wall is not obvious.Under the action of seismic wave with the same peak acceleration,the acceleration response of the inner leaf wall of ordinary prefabricated wall and prefabricated sandwich insulation wall gradually increases in the height direction,and when the peak acceleration increases,the acceleration response of the wall increases gradually.(6)Under the action of seismic waves with the same acceleration peak,the acceleration time history response of each measurement point of the inner leaf wall of the prefabricated sandwich insulation wall with a thickness of 30 mm thickness insulation board is smaller than that of the ordinary prefabricated wall,and with the increase of the thickness of the insulation board in the prefabricated sandwich insulation wall,the acceleration response of the inner leaf wall gradually becomes larger,while the acceleration response of the outer leaf wall gradually decreases.Therefore,when meeting the relevant requirements of wall structure insulation and the minimum thickness of relevant specification standards,the thickness of the insulation board in the wall can be appropriately reduced to achieve the effect of reducing the acceleration response of the inner leaf wall,and at the same time ensuring the safety of the main structure of the wall.Figure [76] Table [46] Reference [58]...