Tests For Seismic Performance And Sound Insulation Performance Of Composite Stiffened Steel Plate Walls In Box-Plate Steel Structure House

In recent years,steel structure building has been widely used because of its green environmental protection and excellent structural performance.Box-plate steel structure house is a kind of box structure,in which ribbed steel plates are directly used as load-bearing walls(abbreviated as stiffened steel plate wall-SSPW)and floor slabs.In view of the shortcomings of SSPW,such as severe kneading of hysteretic loops,large deformation of steel sheet and rapid degradation of stiffness,this paper presents a structural form of composite stiffened steel sheet wall.In this paper,the mechanical mechanism and failure mode of composite stiffened steel plate wall are studied by combining experimental research,finite element calculation and theoretical analysis.Based on the test results and finite element results,a simplified analysis model and a bearing capacity calculation method for composite stiffened steel plate walls are proposed,which can be used as a reference for the design and application of this kind of steel plate walls.Thereafter,the sound insulation performance of composite walls with stiffened steel plate walls as structural skeleton is analyzed,the influence of the thickness of four materials on the sound insulation performance is studied,and the sound insulation design suggestions of composite walls are put forward.Research contents and corresponding results are listed as follow:(1)The Cyclic pseudo-static tests were carried out on one stiffened steel plate wall and three composite stiffened steel plate walls.The lateral stiffness and degradation,bearing capacity degradation coefficient,ductility coefficient and equivalent viscous damping coefficient of four steel plate walls were analyzed.The effects of grid stiffening plate,L-shaped stiffening rib,relative sliding between grid stiffening plate and stiffened steel plate wall on seismic performance of stiffened steel plate wall are studied.The results show that the grid stiffening plate can provide strong support for the steel plate surface,and can significantly improve the lateral stiffness and bearing capacity of the stiffened steel plate wall,and improve the pinching effect of the hysteretic curve.The relative sliding mechanism between the grid stiffening plate and the wall steel plate makes the stiffened steel plate wall have strong energy dissipation capacity,good ductility and excellent bearing capacity stability.L-shaped stiffener can increase the surface restraint of steel plate and the stiffness of structure.Among the three kinds of composite stiffened steel plate walls,the stiffness degradation of SSPW-CP1 is the smallest,while the initial stiffness of SSPW-CP2 is the largest,the bearing capacity degradation is the smallest and the relative cumulative energy consumption is the largest.(2)The pseudo-static cyclic loading tests of three types of composite stiffened steel plate walls are simulated by ABAQUS.The results of simulation and test are compared.The results show that the hysteretic curve,skeleton curve and failure situation obtained by finite element simulation are in good agreement with the test results.Because there is no loading eccentricity,the constraint conditions are more ideal and the bolts are simplified in the finite element model,the bearing capacity and stiffness of the model will be larger.(3)ABAQUS was used to simulate and study the effects of the thickness ratio of steel plate,stiffness ratio of L-stiffeners,stiffness ratio of T-stiffeners and arrangement of bolts on the ultimate bearing capacity of composite stiffened steel plate walls.The results show that the thickness ratio of steel plate has a significant effect on the bearing capacity,and the lateral stiffness and ultimate bearing capacity of thicker plate are obviously larger than those of thin plate.The stiffness ratio of the two kinds of ribs has less influence on the ultimate bearing capacity,and the number of L-shaped stiffeners is more,which has stronger restraint effect on the out-of-plane of the plate,but when the stiffness ratio is larger than a certain value,the influence on the bearing capacity is not obvious;while the number of T-shaped stiffeners is less,which has less influence on the bearing capacity.The arrangement of bolts has a great influence on the ultimate bearing capacity.The more bolts and the tighter arrangement,the higher the ultimate bearing capacity of composite stiffened steel plate wall.Among the four types of parameters,the ratio of height to thickness has the most significant effect on the ultimate bearing capacity,which is the key parameter.(4)Through experimental research and finite element analysis,the failure mechanism of composite stiffened steel sheet wall is revealed.Because of the restraint effect of grid stiffening plate and stiffening rib on steel sheet,the mechanical performance of wall plate originally belonged to thin steel sheet(?>150)is equal to that of medium or thick steel sheet.The failure modes of the three composite stiffened steel plate walls are shear yielding and shear buckling of some sections,and the steel plate walls have not reached the full section yield state.A simplified analysis model is established for the failure modes of composite stiffened steel plate walls.Considering the influence of thickness ratio of steel plate and the shear yield of the whole section of steel plate,the shear bearing capacity coefficient is given.On this basis,considering the influence of slip between members,the slip reduction coefficient is given,and the formulas for calculating the shear ultimate bearing capacity of walls are put forward.(5)According to the code,sound insulation test and performance evaluation of composite wall are carried out.The results show that the composite wall has excellent sound insulation performance,and its air sound insulation performance of building components is classified as 9 grades.The LMS Virtual Lab acoustic finite element simulation verifies that the direct acoustic-vibration coupling method is accurate in calculating the sound insulation of sandwich panels.Based on the orthogonal test method and finite element method,the influence of the thickness of four kinds of materials on the sound insulation of composite walls is analyzed.The results show that the sound insulation is proportional to the thickness of calcium silicate board,fiber cement board,rock wool-A thickness and rock wool-B thickness in the middle and low frequency bands.The thickness of rock wool-B has a major influence on the sound insulation,while the thickness of fiber cement board has a minor effect on the sound insulation.In the middle and high frequency bands,the sound insulation is proportional to the thickness of calcium silicate board and rock wool-B,inversely proportional to the thickness of fiber cement board and rock wool-A.The thickness of rock wool-A has a major impact on the sound insulation of the wall,while the thickness of calcium silicate board has a minor impact on the sound insulation of the wall.From the analysis of weight value,it can be seen that the thickness of rock wool-A and rock wool-B has great influence on the sound insulation of composite wall in the middle and low frequency band and the middle and high frequency band,while the thickness of calcium silicate board and fiber cement board has little influence on the sound insulation of the whole frequency band.Finally,according to the results of sound insulation test and orthogonal test,some suggestions for sound insulation design are put forward.