| With the development of buildings to the super high-rises,there are higher seismic requirements for the frame structure.It is an extremely effective seismic measure for the structural column in the frame-filled wall.The reasonable setting of the construction column not only helps the infill wall to dissipate more seismic energy,but also prevents the wall from collapsing during the earthquake to reduce the damage to the human body.However,although the existing reinforced concrete structural column is content with the current engineering conditions,there are the complicated construction process,the long construction period,and the difficult construction quality to control.The light steel construction column proposed in this paper is convenient for on-site installation and excellent construction effect.The seismic performance of the infill wall are also improved,and a good energy consumption mechanism is ensured.Therefore,the construction technology of light steel structural column as a new type of building technology,its research can provide certain application value for the realization of green building industry in China.The source of this paper is the project called “Application Research of Masonry Infill Wall QuickConnecting Light Steel Construction Column”(2016-K5-039),which is listed as the 2016 Science and Technology Development Plan of the Ministry of Housing and Urban-Rural Development.The mechanical properties of light steel structural columns are studied by the experimental results of this project,and the mainly commence work are as follows:(1)The finite element model of the test piece is established by combining the actual conditions of the test,considering the connection mode of the test piece,selecting the reasonable masonry stress-strain relationship,and comparing the application of the integral model with the separate model.(2)The reliability of the finite element model is verified from the aspects of the failure characteristics of the infill wall,the load-displacement relationship,the loaddisplacement relationship of the structural column,and the stress change of the tie bar.At the same time,the mechanical properties of light steel structural columns and reinforced concrete structural columns are compared from the experimental and numerical simulations.It is found that both light steel structural columns and reinforced concrete structural columns can exert their respective mechanical advantages to improve the bearing capacity of the infilled walls.The crack initiation and collapse of the infilled wall is better,and the reinforced concrete structural column can not inhibit the crack of the infill wall.(3)In this study,six light steel structural column specimen models were designed by pseudo-static loading method,and the hysteresis curve,skeleton curve,stiffness variation,ductility coefficient and energy dissipation capacity were studied to obtain corresponding hysteresis.The mechanical law of the curve provides a basis for the seismic performance of the light steel structural column.It can be seen from the results of this study that the reasonable setting of the light steel structural column can avoid the brittle failure characteristics of the infill wall and exhibit better ductility.It is effective to analyze the restraining effect of light steel structural columns on the infill wall from various indicators and has good seismic performance. |
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