Mechanical properties analysis of cast steel joints in the construction stage of the steel roof structure of Tianchang national fitness center stadium
Because of the large number of strings and staggered connections,the traditional intersecting joints cannot meet the connection requirements of the rods in the complex long-span pipe truss steel structure due to the limited section,insufficient connection stiffness and insufficient intersecting lines.Cast steel joints are widely used in space structures due to their advantages of one-time casting,strong shape adaptability and uniform material.In this paper,the mechanical analysis of 8 typical cast steel joints is carried out for the steel roof project of Tianchang National Fitness Center Stadium.The number of rods connected to cast steel joints ranges from 4 to 12,which can be divided into two types:support cast steel joints and space cast steel joints.In the analysis,two main construction conditions of closure and unloading are considered.In the unloading condition,the influence of the unloading sequence of the temporary support of the inner and outer rings on the cast steel joint is considered,and the stress cloud maps of the cast steel joint under each working condition is compared.The analysis results show that the maximum Von-Mises stress is only 22 MPa when the outer ring temporary support is completely unloaded and the inner ring temporary support is half unloaded,and the maximum stress is about 51 MPa when the outer ring temporary support is completely unloaded.Under five main construction conditions,the stress distribution of eight typical cast steel joints is relatively uniform,the stress transition at the joint and bar joint is reasonable,and the stress distribution in the core area of the joint is small,which can ensure the effective connection and internal force transfer between the bars of the main structure of long-span pipe truss.
long span steel structurecast steel jointsconstruction conditionsmulti-scale finite element method
万方数据
维普
