| A new type of concrete-infilled double steel corrugated-plate wall(CDSCW)is proposed,and its failure mechanism and design method are investigated.The CDSCW consists of a wall element that is formed by two steel corrugated-plates,where they are interconnected through high-strength bolts,and the spacing between the two steel corrugated-plates is filled with concrete.Additionally,two concrete-infilled steel tubes are assigned as vertical boundary elements at both sides of the wall element.For the wall element,the corrugated configuration of steel corrugated-plates improves the compression and shear bearing capacities of CDSCWs.CDSCWs also possess significant combination actions among steel corrugated-plates,bolts and concrete.On the one hand,the steel corrugated-plates are strongly restrained laterally by bolts from moving outwards and by concrete from moving inwards,resulting in a significant enhancement to the load-bearing capacities of the steel corrugated-plates.On the other hand,owing to the infilled concrete that is being restrained laterally by a steel corrugated-plate and bolting system,it has better compressive load-bearing capacity and ductility.In terms of the vertical boundary elements,they not only sustain external loads,but also can be regarded as additional side constraints to the wall element,which enhance the vertical and lateral load resistance of CDSCWs,and improve the ductility and energy-dissipation capacity of CDSCWs when affected by seismic actions.Moreover,the convenience and high-efficiency of assembly owing to the construction features of CDSCWs completely meet the current development trend of China's residential structures.Firstly,the sectional strength capacities of ?-section CDSCWs(?-CDSCWs)when subjected to combined compression-bending-shear loads are studied.The study is based on the full-section plastic stress distribution without considering the concrete in tensile zone.The finite element simulation is used to analyze the adverse effects of local buckling of steel corrugated-plates,weakening of tensile-compressive transition zones and shear forces on the vertical load-bearing performance of steel.The formulae for designing the section strength capacities of the ?-CDSCWs are then established.The validity of the formulae is verified by the sectional strength experiment.In addition,bolt tension design formulae are established based on bolt failure mechanism and refined finite element analyses.Secondly,the overall stability capacities of ?-CDSCWs when subjected to combined compression-bending loads are studied.The formulae for estimating the elastic buckling loads of ?-CDSCWs are obtained based on the form of Euler's formula.The overall instability performance of ?-CDSCWs under compressions is then studied by finite element numerical analyses,leading to the?_N-?_n curve for their overall stability capacity design.The validity of the formulae is also verified by the overall stability experiment.Then,the overall stability performance of ?-CDSCWs under the combination of compression and bending is numerically analyzed to obtain the overall stability N-M correlation curve.Finally,the hysteretic performance experiment of eight ?-CDSCWs specimens is carried out to verify that they have good energy dissipation performance.Based on the damage constitutive model of steel and concrete,a refined finite element model is established to accurately simulate the hysteretic experiment,and the important effects of boundary elements on the seismic performance of the ?-CDSCWs are revealed through expanding researches.As a result,the design method of boundary elements meeting the design requirements of seismic performance is proposed.The results of this paper provide a reference for the actual engineering design of ?-CDSCWs,and have been adopted by the engineering construction standard-“Technical specification for structures with corrugated steel plate components”(T/CECS 624). |
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