| Recently,there is an increasing trend across the engineering and academia to focus on integrated modular steel construction(IMSC)attributable to its technical highlights such as shortened project period,improved quality and reduced environmental pollution.However,the current application of IMSC is mainly limited to non-seismic zones and the related research on its seismic behavior is insufficient.Consequently,this paper mainly focuses on the seismic performance of corrugated steel plate shear wall and innovative connection in IMSC.The major research work and achievements are as follows:(1)Full-scale cyclic tests on corrugated steel plate shear walls(CSPSWs)were carried out.The test apparatus was designed based on the construction process of IMSC.Two groups including eight full-scale CSPSWs with and without openings were tested under cyclic load.The papameters studied in this research include thickness,length,profile of the infill corrugated steel plate and the opening area ratio.The test results indicate that for the specimens without opening,the damage process can be identified as three major stages: the elastic stage,the buckling stage and the postbuckling stage.However,the damage process of the specimens with opening can be identified as the elastic stage,the yield development stage and the failure stage.Furthermore,the initial stiffness of CSPSWs is significantly reduced while the energy dissipation capacity improved due to the opening.(2)The finite element analysis(FEA)of seismic performance of CSPSWs was conducted.The finite element model(FEM)of CSPSWs was established and the influences of geometrical nonlinearity,material nonlinearity and initial geometrical imperfection were considered.The reliability of the FEM was verified by comparing the test results of the specimens under cyclic load with the numerical ones.The stress variation process and development of equivalent plastic strain of the specimens were revealed.The failure mechanism of the specimens were revealed and the reasonable location of the openings was recommended.(3)The formula for calculating the initial stiffness of CSPSWs was derived.The theoretical model for CSPSWs with and without opening were developed,respectively.The design formula of initial stiffness for CSPSWs was derived and verified by comparing with related test and numerical resutls.The results indicate that the recommended design formulas can provide better accuracy,as compared to the related formulas in the current technical specification for steel plate shear walls(JGJ/T 380-2015).The influences of the thickness,length,profile of the infill corrugated steel plate and the location of the opening were revealed by parametric analysis.(4)An innovative bolted connection with welded cover plate for IMSC was proposed.The proposed connection is intended to settle the incompatibility between the connection and internal finish and makes it possible to connect the individual module units outside the building entirely.Eleven full-scale specimens in three groups were tested under monotonic and cyclic load to study the seismic performance of the proposed connection in terms of load-transferring mechanism,hysteretic curve,strength and stiffness characteristic,ductility and energy dissipation capacity.The test results indicate that the proposed connection can be classified as semi-rigid connection.The proposed connction well satisfies the ductility requirements by Chinese code for seismic design of buildings(GB 50011-2010)and American Seismic Provisions for Structural Steel Buildings(AISC 341-10).It is recommended to reinforce the panel zone to satisfy the “strong-column-weak-beam” strategy for seismic application.(5)The simplified model and design formulas predicting the bending capacity and initial rotational stiffness of the bolted connection with welded cover plate were proposed.The detailed and simplified FEM were developed and verified by comaring with test results.It is indicated that the developed simplified FEM can well predict the initial rotational stiffness and underestimate the bending capacity of the proposed connection to some extent.The design formulas predicting the bending capacity and initial rotational stiffness of the proposed connection were derived and verified by comparing with the test results.It indicates that the proposed formulas are in good agreement with the test results. |
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