Seismic Performance Research On Joints Connecting Double Skin Composite Wall With Steel Truss And H-shaped Steel Beam

The double skin composite wall is composed of boundary columns and double skin steel plates.Concrete is filled inside to form the composite structures.The concrete prevents the steel from local bucking,while the steel plate restrains the deformation of concrete and put the concrete under triaxial compression.It takes full advantage of the compressive property of concrete and the tensile property of steel.Based on the double skin composite wall,the new double skin composite wall with steel truss reinforce the double skin steel plate by the steel truss,which can delay the buckling of double skin steel plate effectively.The double skin composite wall with steel truss can bear the perpendicular loads and resist horizontal earthquake action simultaneously,which indicate the new composite wall owes excellent seismic performance.The double skin composite walls with steel truss are in need of forming up reliable connections to H-shaped steel beams when applied to frame-shear wall structure.The double skin composite wall with steel truss to H shaped steel beam connection is the key part for the structural system when required of transmitting force reliably.And its seismic performance has significant influence on the structural system.Four new different configurations of the double skin composite wall with steel truss to H-shaped steel beams connections are proposed in this paper from the perspective of reasonable force-transmitting,simple configuration and easy construction.With the purpose of investigating the seismic performance of the four kinds of double skin composite wall with steel truss to H-shaped steel beams connections,the four full-scale double skin composite wall with steel truss to H-shaped steel beams connections specimens were designed so as to conduct quasi-static cyclic tests.The four specimens’ failure process and working status of the key part were analyzed.Seismic behaviors such as bearing capacity,ductility coefficient,stiffness degradation and dissipative coefficient could be derived from the hysteretic curves and skeleton curves.The experimental results indicate that four connections’ failure are led from the flange tearing at the end of external plate.Shift-away of plastic hinge can be obviously observed.The double skin composite wall with steel truss is not found to have obvious deformation,which is good to satisfy “strong wall and weak beam,strong connection and weak component” design philosophy of the steel frame-shear wall structure.Four different configurations of the double skin composite wall with steel truss to Hshaped steel beams connections specimens were simulated by the finite element analysis software ANSYS.Failure characteristics,hysteretic curves,skeleton curves,bearing capacity,ductility coefficient,stiffness degradation,dissipative coefficient and strain distribution on key positions of the connections were concluded from finite element modeling.Finite element simulating results were well in accord with the experimental results.The accuracy of finite element models was therefore verified.Parametric analysis for the standard double skin composite wall with steel truss to Hshaped steel beams connections was conducted through finite element method in order to reveal the influence of the length of external plate,the thickness of external plate,the ratio of width to thickness of external plate and the ratio of axial compression on connections’ seismic performance.A few guidelines are suggested for the design and application of the standard double skin composite wall with steel truss to H-shaped steel beams connections.A design method toward the standard double skin composite wall with steel truss to H-shaped steel beams connections are proposed on the basis of relevant design code,which will provide important evidence for the application of the structure of double skin composite wall with steel truss.