The Effect Analysis Of Support Settlement On Mechanical Behavior Of Large Span Steel Truss Gallery

Corridor structure refers to the design of high-rise buildings in a certain height of the connection body,corridors make the original independent of each other high-rise building monomer structure organically integrated as a whole,so that it can greatly improves the use of the buulding.But the corridor structure will also make the structure more complex,so that the corridor design and construction will put forward higher requirements.The vertical stiffness of the corridor is large,and the additional internal force caused by the sedimentation increases.It is an important task to study the influence of the construction process,the settlement of the design stage on the mechanical performance of the large span corridor,and provide useful suggestions for similar engineering design.1,SAP2000 finite element software has been used to analyze the vertical load,bearing settlement,temperature and vertical seismic effect of large span steel corridor deformation and internal force changes.The results show that under the vertical load,the central part of the corridor has largest force and deformation.The bearing settlement and the temperature rise can cause the floor to crack and the temperature rise effect to make the truss bar nodes move upwards and have a great influence on the structure.On the action of the earthquake,the corridor truss is mainly subjected to the shaft force.2,Based in a single truss,the useful selection of large span steel structure corridor is explored.The analysis shows that when the span of the steel truss is small,the intermittent fastening steel trusses and the unequal intermittent fastening steel trusses can be used,and the intermittent fastening steel trusses should be preferred.When the span of the steel truss is large,the helical steel truss and the inclined steel truss can be used.In the design,the diagonal rods at the end of the diagonal truss are extended to the column,which can greatly reduce the truss span and make the internal force of the truss,Force of truss is more reasonable.3,the large span steel gallery construction stage has been analyzed.It briefly describes the hourglass type temporary support used in this project,focusing on the influence of temporary support and temporary support unloading on the internal force of large span steel structure corridor.The analysis The analysis show that the temporary support loading and unloading make the structure deformed in the horizontal direction and the deformation in the vertical direction.Before and after unloading,the axial force of the middle section of the structural chord increases greatly,Rod and abdomen connection bending moment and shear force are a significant increase.4,The finite element analysis of the long-span steel corridor is carried out by the bearing settlement,temporary support unloading stage settlement warning value can be proposed,Considering the settlement of the intergral palne settlement,the "basin" type of settlement and the "saddle" type of settlement Stress and deformation law of steel structure corridor under different bearing subsidence.The analysis shows that when the temporary support is not unloaded during the construction stage,the uneven settlement between the two ends should be controlled within 50 mm.Under the bearing subsidence,the deformation of the corridor is different.The internal force of the middle part of the corridor is the largest;When the steel gallery is not prone to uneven settlement,it should try to avoid the maximum settlement occurred in the middle of the corridor;The effect of sedimentation on the steel beam near the subsidence is greater,which is less affected by the sedimentation.