Research On Performance Of Combined Steel And Lead Energy Dissipation Nodes Of Glued Wood Reticulated Shell

With the country put forward the strategic goal of achieving sustainable socioeconomic development,the modern building industry is moving in the direction of large-span,high-rise,assembly,and green energy-saving.As a new type of green energy-saving building,glued wood reticulated shell structure has been paid more attention,among them,the core of the technology which design the node type and improve the integrity of the glued wood reticulated shell structures.As a new type of large-span space structure,the glued wood reticulated shell structure has large cross-section dimensions of the latticed shell members,and the joints usually need to be connected with large steel sleeve members and bolts to assist the connection.Generally,the oblique arrangement is required in the steel sleeves.Support to improve the overall stiffness of the joint,but this arrangement will result in a large difference between the stiffness of the member and the joint,bolt connection can not guarantee the reliable connection at the node under the earthquake.In this paper,a kind of steel lead combined energy dissipating node is proposed,which improves the ductility and energy dissipation capacity of the node at the same time,and thus improves the reliability of the node.The steel lead damper is a combination type of metal damper and has a good theoretical research value in the field of civil engineering.Lead is a metal with good ductility and low yield point,but also has dynamic recovery characteristics.The energy dissipation effect is very obvious,but the rigidity is small.The yield point and rigidity of steel are higher than that of lead.Combining the two can guarantee The rigidity of the nodes can improve the overall energy consumption and fully utilize the advantages of both metals.In this paper,K6 type single-layer spherical veneer wood lattice shell joints are selected as the research object,a reasonable constitutive relation is selected to perform pseudo-static analysis on the connection of the new steel lead composite energy dissipation node.Combined with the finite element software ABAQUS analysis,the bearing capacity,deformation displacement,strength,stiffness and energy consumption are obtained.It is concluded that the hysteresis loop of the energy dissipating node is symmetrical and full,and it can quickly enter the plastic yield stage to stabilize the energy consumption.By comparing the mechanical properties of the three groups under different loading modes,it is found that the mechanical behavior of the element is less affected by the adjacent energy dissipation elements,and the joint structure is reasonable..By summarizing the regularity of the hysteresis curve and selecting an appropriate restoring force model,the influences of the width of the middle plate,the height of the lead block(separator)and the thickness of the lead block on the energy dissipation capacity and hysteresis performance of the energy absorber are analyzed.The study found that reducing the height of the lead block(separator)and increasing the thickness of the lead block can effectively improve the energy dissipation capacity of the node.The effect of the intermediate steel plate width on the node energy dissipation capacity is small,and then 125 groups of finite element models are established,and three parameters and node initials are established.The linear regression analysis is carried out on the relationship between the initial stiffness,yield stiffness,yield force and maximum damping force of the node,and the corresponding calculation formula is fitted,which lays a foundation for the design of node size in the future.;Finally,using the finite element analysis software Ansys to analyze the seismic performance of glued wood reticulated shell,the relative displacements of the joints under the three kinds of seismic waves are compared between the glued wood reticulated shell using the traditional rigid joints and the glued wood reticulated shell using the combined steel and lead energy dissipation nodes.It is proved that the use of energy dissipation nodes can effectively reduce the X direction displacement of the reticulated shell node.