Experimental Study And Theoretical Analysis On Mechanical Behavior Of Steel Plate-Masonry Composite Irregular Shaped Columns

There is a desire to convert some masonry walled buildings into framed structures to increase usable spaces. This involves the removal of parts of the masonry walls and conversion of the remaining parts into beams and columns to form a reliable framed structure. The method in this paper for this conversion is to attach steel plates onto three sides of the remaining horizontal masonry portions to form SPMC beams, and all sides of vertical components to form steel plate-masonry composite columns. The removal of waslls easily result into the L or T shaped collumns and those cross section were functional decorative. In order to popularize the application of the SPMC, both static and seismic research of SPMC irregular shaped columns are needed.Through the way of experiment and theory analysis, this paper focus on the research of performance and design manners for the SPMC irregular shaped columns.Firstly, paper focus on the performance of rectangular SPMC columns under different lateral restrain condition. Based on the previous study of SPMC research group, experiment was carried to verify the basic performance of collaborate between the steel plate and the masony. The bondbehavior supplied by the glue was researched and the peak value when the steel plate divorced from the masonry was measured. Then, seventeen short column specimens were tested to research the performance under the axial loading and different lateral restraint. Those restraint enhanced the specimen grately. Lastly the equilibrium equation of plate under the theory of small deflection and large deflecton were deduced.Secondly, this paper presents an experimental study on the static behaviour of steel plate-masonry composite (SPMC) columns consisting of 6 L-shape and 6 T-shape irregular masonry SPMC columns. Specimens were tested either under the axial loading or the eccentric loading. The location of welding line, two kinds of bolt spacing including 300mm and 400mm, which were commonly used in the practical engineering, were investigated. The failure mechanism of the specimens was discussed and the design formulas were deduced, which can be helpful to the future engineering application.Lastly, this paper presents an experimental study on the seismic behaviour of steel plate-masonry composite (SPMC) columns consisting of 4 L-shape and 4 T-shape irregular masonry SPMC columns. The four L-shape and four T-shape SPMC specimens were tested under combined axial force and cyclic lateral loading. The effects of the cross section, axial loading level, location of welding line and bolt spacing were investigated. Cold-formed steel plates were adopted to avoid weld fracture which occurred in previous studies. Based on parametric studies, a modified hysteretic curve model, skelecton curves and formula of stiffness degradation were proposed for SPMC columns.