Research On The Stability Of Wall Panels And Design Method Of Joint Connecting Beam And Wall For Steel Corrugated-plate Composite Walls

This thesis studies the stability of concrete-infilled double steel corrugated-plate composite walls(CDSCW),as well as the failure mechanism and bearing capacity of wall-beam joints,and proposes corresponding design methods.The CDSCW uses intermediate bolts to connect two corrugated steel plates,infilled concrete between the two steel plates,and CFST columns on both sides as vertical boundary elements.The out-of-plane bending stiffness of the steel corrugated-plates are significant,and the steel corrugated-plates are combined with concrete and constrained by intermediate bolts,making the CDSCWs have high load-carrying efficiency and good seismic performance.The CDSCWs are suitable for industrial production and have a high degree of on-site assembly,suitable for use in high-rise residential structures.According to architectural design requirements,the CDSCWs can be arranged in I-section,T-section and Z-section.Due to the high load-bearing efficiency of the CDSCWs,the sections of the wall panels are relatively expanded.The panels of the CDSCW with T-section or Z-section will have out-of-plane instability failure around the intersection of the wall panels,and the stability design of the wall panels is more prominent.In this paper,the instability mechanisms of the wall panels are revealed by the combination of theoretical analysis and numerical calculation,and the design methods of the global stability bearing capacity of the wall panels are proposed.In addition,this thesis also studies the bearing capacity of the wall-beam joints of the CDSCWs,respectively using experimental research,theoretical analysis,and finite element simulation.The failure modes and the hysteretic behavior of three types of wall-beam joints of the CDSCWs are revealed,and the design methods for wall-beam joints using flitch plate connection are proposed.This thesis proposes a design method for the global stability bearing capacity of wall panels of CDSCWs including three-side simply supported and one-side free wall panels,and four-side simply supported wall panels.Based on the orthotropic plate theory,the elastic buckling loads of the wall panels are theoretically deduced,and the stability performance of the wall panels under axial compression,bending moment,and the combination of compression and bending moment are studied by finite element numerical analysis.The compressive stability coefficient curve of the wall panels and the compression-bending interactive curve for the stability capacity of the wall panels are obtained,and accordingly the design methods for the stable capacity prediction of the wall panels are proposed.The hysteretic performance tests are conducted on four wall-beam joints specimens of the CDSCWs,revealing the bearing capacity,failure mechanism,and ductility of three wall-beam joints.In the tests,beam end failure and bending failure of the joints occurred,and the bending failure of the joints mainly occurred on the tension side of the joints.Based on the experimental results,the finite element models are established to analyze the load-bearing performance of the wall-beam joints of the CDSCWs.The design methods for wall-beam joints using flitch plate connection of the CDSCWs are proposed.In this paper,according to the failure phenomenon in the tests and the FE analysis results,the tensile failure mechanisms of the flange plates of the boundary compressive elements,the flitch plates,and the weld seams are analyzed,and the design methods of the tensile bearing capacity of the flitch plates based on the yield hinge line are proposed.This thesis also considers the influence of uneven weld stress distribution and proposes a reduction factor for the calculation of the tensile bearing capacity of the weld seams.The design method proposed in this paper provides a basis for the engineering application of the wall-beam joints of the CDSCWs.