Research On Hysteretic Behavior Of T-joints In Intersecting Truss Grid Structures

Steel structure has a good seismic performance,Research on hysteretic properties of steel structures under cyclic loading week low has great significance for the seismic design.Intersecting truss grid structure is a new structure in the form of steel,having a rod and a small number of nodes, simple and beautiful, good mechanical performance, etc.Intersecting mesh node truss structure make the competent by the through pipe,the remaining non-remitted tube through competent,Director of the non-penetrating end of the cutting line intersecting with the competent wall after welding constitute joints.Mechanical properties under cyclic loading structure called hysteretic performance.The properties of hysteretic structures is different with the properties of hysteretic structures under monotonic loading.However, in domestic and abroad more sutudy concentrate on joints Static performance,while less research on nodes under cyclic loading hysteretic behavior.This paper uses ANSYS software study circular steel tubular T-joints in hysteretic performance under cyclic loading.The main contents are as follows1.Effect of geometric parameters to joints of nodes hysteretic properties.Study the effect of ?(branch in charge of the pipe thickness ratio t / T), ?(supervisor diameter and thickness ratio D / T), ?(the diameter of the branch in charge ratio d / D), for joints with hysteretic properties,by three groups(each group consistent of three) Joints models.2.Effect of welding residual stress on joints hysteretic properties.Compare the hysteretic performance considering welding residual stress with no welding residual stress by two groups(each group consistent of four models) joints model.Study the effect of residual stress on the hysteretic behavior.3.It describes the cumulative damage theory and six different damage assessment model.By the damage to a unit case,cumulative damage model chosen by Shen ZU Yan proposed, demonstrating the cumulative damage of the steel material reduction process on qualitative.4.Design 18 different geometries joints, extracting results data,by multivariate analysis and nonlinear regression fit analysis,obtaining formula node parameters under cyclic loading hysteresis curve skeleton curves characteristic points.Ultimately obtain tubular T-joints under cyclic loading hysteretic model.