Analysis And Research On The Joint Stress Of Corrugated Prefabricated Steel Pipe Gallery Under Dynamic And Static Load

Compared to traditional reinforced concrete pipe racks,corrugated prefabricated steel pipe racks have advantages such as light material,short construction period,low cost,strong stiffness,and strong tensile,compressive,and bending resistance,at the same time,it has good adaptability to terrain and deformation in different environments in underground environments,and has been widely applied in important engineering fields such as pipeline tunnel engineering and underground culvert channel engineering.At present,research on corrugated steel pipe corridors focuses on the overall study of their stress and deformation patterns,while there is relatively little research on the nodes of corrugated steel pipe corridors.However,the node position of the pipe gallery has a significant impact on the overall structure of the pipe gallery.The node position of the pipe gallery will generate significant stress and stress concentration,and if it exceeds its yield strength,it is likely to cause damage,which will have a significant impact on the overall structure of the pipe gallery.Therefore,it is necessary to conduct stress analysis on the node position of the pipe gallery,analyze the distribution of stress and deformation patterns.This article uses on-site load tests and numerical simulations to study the mechanical performance of corrugated prefabricated steel pipe gallery connection nodes.The main research contents are as follows:(1)Review relevant literature,summarize the current research status of corrugated prefabricated steel pipe racks and flange connection nodes both domestically and internationally,and elaborate on the significance of selecting research topics for the circumferential and longitudinal flange bolt connection nodes of corrugated prefabricated steel pipe racks in practical engineering.(2)Monitor the axial stress of bolts,stress-strain of flange plates,and opening displacement of node joints under 7 static and 3 dynamic load conditions for the circumferential flange bolt connection nodes and longitudinal flange bolt connection nodes of the corrugated assembled steel pipe gallery,and draw relevant change curves.Compare and analyze the experimental data to summarize the stress and deformation distribution patterns of the node connection parts,and identify dangerous points prone to stress concentration,Explored the phenomenon that dynamic load has a relatively small impact on the mechanical performance of node connections.(3)Establish finite element models of circumferential flange bolt connection nodes and longitudinal flange bolt connection nodes using ABAQUS software.Gradually introduce the steps of mesh division,contact analysis,boundary conditions,and load application in the process of establishing the finite element model.By observing the Mises stress cloud maps of each node,extract the stress-strain deformation laws of each node,and compare and analyze them with the results of onsite load tests,Verified the effectiveness and rationality of the model.(4)Under the established finite element model,the effects of material strength,thickness of corrugated steel plates,thickness of flange plates,and diameter of bolts on the mechanical properties of corrugated steel pipe gallery connection nodes were studied by changing relevant parameters.The results show that these parameters can improve the load-bearing performance of nodes,but the improvement effect will not be significant when it reaches a certain level.Choosing Q345 for the material strength of corrugated steel plates,10.9 for the bolt strength level,6mm for the thickness of corrugated steel plates,18 mm for the thickness of flange plates,and 24 mm for the diameter of bolts has high economic efficiency and rationality.The research results of this article can provide certain reference significance and basis for the structural design and construction of corrugated steel pipe gallery nodes,as well as corresponding specifications.