Experimental Research On Light Steel-foam Concrete Composite Wall Under Low-cycle Reciprocating Load

In recent years,the state has formulated a series of special plans and successively introduced a series of building energy-saving standards.As the main load-bearing component of the light steel residential system,the new type composite wall has gradually come to the market in recent years.It is found by consulting relevant codes and standards that a lot of research on the index of the lateral performance of the combined wall in the standards and codes is carried out under monotonic loading.Therefore,it is necessary to carry out a systematic study on the lateral resistance of the composite wall under low-cycle reciprocating loads.There are many forms of combined walls.Light steel-foam concrete combined walls have the advantages of fire resistance,good thermal insulation,sound insulation and heat insulation,high strength,and low cost.The main weighing components of this composite wall are light steel keel skeleton and fiber cement pressure plate.The foam concrete made from industrial waste slag and compound additives is poured inside to form the cast-in-situ light steel foam concrete sandwich composite wall.In this paper,the light steel-foam concrete composite wall is used as the research object,and three sets of test walls(one set of standard test pieces and two sets of comparative test pieces)are designed to complete the test of each test piece under the action of horizontal low-cycle reciprocating load.The test phenomenon of the test piece at each stage was recorded in detail,the failure forms and characteristics of the test piece were analyzed,and the skeleton curve of the combined wall under reciprocating load was obtained through the hysteresis curves of the test records.Through calculation,data such as ultimate bearing capacity,ultimate displacement and shear bearing capacity of each test piece are obtained.The test data were sorted out,the differences between the three groups of walls were analyzed,and reasonable explanations were given,and the conclusions were drawn: 1.The presence or absence of foam concrete is the main factor affecting the lateral resistance of the composite wall,and the limit of the foamed concrete composite wall is cast the carrying capacity has increased by about 200%.2.Adjusting the spacing of steel keel columns does not have much effect on the lateral resistance of the combined wall.The finite element analysis software ABAQUS was selected to model the test standard test specimen,and the modeling method was innovative.The factors such as the connection of the self-tapping screws and the contact method between the panel and the core material were compared.The feasibility of the analysis and modeling method was verified.Seven groups of models were established and three groups of control groups were established.The effects of axial compression ratio,steel thick Ness,and structural form on the lateral resistance of the wall were studied,and the following suggestions were obtained: 1.Increasing the axial compression ratio can increase the horizontal ultimate load of the composite wall.However,the ability of the corresponding combination wall to resist deformation will weaken,the energy consumption capacity will increase,and the stiffness degradation will be more obvious.In actual work,you can consider improving the anti-side performance of the combined wall by reducing the axial compression ratio.2.Increasing the thick Ness of the steel within the economically acceptable range will effectively improve the side resistance of the combined wall.3.Changing the internal column to the diagonal brace will decompose the horizontal reciprocating load onto the diagonal brace,so it will maximize the lateral resistance of the combined wall.