Analysis On Temperature Field And Stress Field Of Steel Plate Concrete Composite Shear Wall

With the rapid development of economy and society,super high-rise buildings have developed rapidly in China.As a new type of lateral force-resisting member,the steel plate concrete composite shear wall has been widely used in high-rise buildings due to its good ductility and superior energy dissipation capability.In order to meet the requirements of high-altitude construction,high-strength,high-performance self-compacting concrete is often used for steel plate concrete composite shear wall structures.High-performance concrete due to the heat of hydration produced in the early construction will accumulate a lot of heat,and due to the large size of the wall,the heat could not be diffused easily,resulting in wall temperature rise.Under the combined action of the steel plate,studs and external constraints of the wall,the wall is easy to form a large stress and cause cracks,which will affect its durability.However,at present scholars at home and abroad mainly focus on the seismic performance of steel-concrete composite shear walls,and there are few studies on the temperature stress of steel-concrete composite shear walls and cracks generated during the early stage of construction.This paper summarizes the research status and application of steel-concrete composite shear walls and studies on the early temperature field and stress field of steel-concrete composite shear walls with the combining method of tests and finite element analysis.And the main research content and conclusions are as follows:By designing and carrying out full-scale tests on 3 steel concrete composite shear walls cooperation with the construction unit,the early temperature distribution law of the composite shear wall was studied;the 3 walsl were simulated by the finite element analysis method,and the simulation results coincide with the experiments results.Two common types of composite shear walls were selected,and the influence of factors on the early temperature field of composite steel-concrete shear wall were studied by using the finite element method,in which factors conclude the wall thickness(500mm,1000mm,1500mm,2000mm)and design strength for concrete at different age(considering strength grade of concrete for both 60d design strength and 28d design strength);and two kinds of steel plate concrete composite shear walls are compared and analyzed by selcting several targets for temperature control.The following main conclusions are drawn from the analysis results:in the construction of large-thickness steel plate concrete composite shear walls,the risk of cracks can be reduced by using 60d design strength concrete mix proportion;after the wall thickness exceeds 1500mm,for two concrete mix proportions,the temperature difference between inside and outside of the two kinds of steel plate concrete composite shear walls exceed the code value;the inner plated steel plate concrete composite shear wall is superior to the outer plated steel plate concrete composite shear wall in several control standards.