摘要
This paper presents a new type of steel pipe pile wharf connection node.The steel pipe and concrete are connected by ultra-high performance concrete(UHPC)grouting to improve the bonding performance between the concrete and steel pipe and enhance the mechanical performance of the specimen under earthquake action.A bond test between the steel tube and the concrete was carried out.Considering the interaction between materials,the proposed concrete constitutive model was proposed.The finite element analysis method was used to simulate the structural response of the UHPC grouting connection concrete-filled steel tube(UCFST)beam-pile joint and the normal strength concretefilled steel tube(NCFST)beam-pile joint under earthquake action.The results indicate that the bond performance between the UHPC and the steel tube is stronger.The UCFST specimen has a relatively high bearing capacity and stiffness.When the ratio of the UHPC grouting layer to the component diameter is 0.5,the bearing capacity is the highest.When the ratio is 0.37,the ductility is the highest.When the ratio is 0.25,it combines the advantages of the two situations mentioned above.UCFST specimens have better energy dissipation capacity and damage,which can effectively improve the seismic performance of components.
基金
financially supported by the National Key Research and Development Program of China(Grant No.2022YFC3102305)
the Taishan Scholar Program of Shandong Province(Grant No.tsqn202211049)
the Key Engineering Innovation Project of Shandong Province(Grant No.2019JZZY010301).
