Optimization Design Of Staggered Truss Of Steel Structure

Steel has excellent properties such as high strength,uniform material,good plastic toughness,light weight,and easy manufacturing,and it has always been an important material for building structures.With the rapid growth of China's annual steel production over the years and the release of the Ministry of Construction's policy of vigorously promoting the application of steel structures in multi-story and high-rise civil buildings,the application of this architectural structure of steel structures in China's high-rise buildings will follow.increase rapidly.The staggered truss structure system is a new type of structural system developed on the basis of the steel frame structure and is applicable to high-rise civil buildings.The staggered truss structure system is a space structure system composed of plane trusses,columns,coupling beams,and floor slabs.The traditional staggered truss structure has a large pitch,which has advantages and disadvantages,and also reduces the longitudinal resistance of the structure when a relatively large house area is obtained.The traditional staggered truss structure has a much smaller longitudinal stiffness than the lateral resistance,which greatly reduces the seismic performance of the structure.To increase the lateral stiffness,it is necessary to increase the section of the beam and the column,but it will increase the amount of steel used.It is the most economical and reasonable way to arrange the support between columns in the longitudinal direction of the structure.The main research content of this article:(1)In order to improve the longitudinal stiffness of the structure,four different types of intercolumn supports are arranged in the longitudinal direction of the structure: monoclinic support,Xsupport,V-support,and herringbone support.Using PKPM's PMSAP model to model these four models,the smallest displacement and the most economical and reasonable layout is selected to support herringbone.The arrangement number and arrangement position of the herringbone support are analyzed to provide reference for the actual building design.While satisfying the functional requirements of the structure,it can also be safe,reliable and economically reasonable.(2)In order to improve the overall seismic performance of the structure,the viscous dampers were applied to the staggered truss system of steel structures.Three models were built using ANSYS finite element analysis software: the original structure model,and the slanted sides of the trusses between the fasting joints.A viscous damper model was added to the rod,and a viscous damper model was added to the vertical and the abdominal rods of the truss.The elastic-plastic dynamic time history analysis of the three models under the action of rare earthquakes was carried out.By comparing the displacements of the three models and the internal forces of the members,a viscous damper can improve the seismic performance of the staggered truss of the steel structure.