Exploration of Design for Large-span Steel Wood Composite Truss
In response to the national"dual carbon"call,fully utilizing the lightweight and high-strength weight ratio characteristics of laminated wood,laminated wood and steel pipes are combined to form a steel wood truss,designed as a large-span spatial arch truss structure.The glued wood is made of North American Douglas fir glued wood,with a strength grade of TCT28.The steel pipe is a hot-rolled seamless round steel pipe,and the steel is Q355B steel with strength.The glued wood serves as the lower chord of the composite truss,while the upper chord and other web members,as well as diagonal supports,use steel pipes.The circumferential wood slender members and steel pipes provide stable support outside the truss plane.All members are simulated using beam elements,and beam end constraints are released.The segmented areas of wooden components and column bases are made into hinge joints,and all steel pipes are also hinged.The wooden structure is connected by connecting plates,and the steel welding is done using a fully penetrated groove welding method.The analysis of structural deformation,component stress,natural vibration characteristics,and steel component verification shows that all indicators meet the requirements of the specifications,and the overall torsional stiffness of the structure is good.The linear and nonlinear buckling analysis of the overall model shows that the overall stability safety factor of the structure meets the regulatory requirements and has sufficient safety reserves.
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