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- 저자 : Caiqian Yang (검색결과 2 건)
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Chen Chen,Caiqian Yang,Yong Pan,Honglei Zhang,Hans De Backer 한국강구조학회 2021 International Journal of Steel Structures Vol.21 No.4
In this paper, the structural performance of the prestressed concrete T-girder bridge with a newly proposed diaphragm transverse connections (DTCs) have been investigated. The DTCs are composed of diagonal braces and horizontal brace, and the braces are structural steel with square cross section. A series of simulations have been carried out to study the eff ectiveness of the proposed DTCs on enhancing the transverse connection of the prestressed concrete T-girder bridge. Load Model 1 in accordance with Eurocode 1 is considered in the simulations, which consists of tandem system and uniformly distributed loads (UDL system). The Von Mises stress of the DTCs has been checked and corresponding steel grade has been given. The force on the surface between the T-girder bridge and the proposed DTCs has been studied and detailed connection design has been given for both new bridge construction and existing bridge retrofi tting. The simulation results show that the maximum defl ection arises when the deck is fully loaded with the UDL system and with lane 1 centrally located on exterior girder, and the tandem systems are applied at midspan simultaneously. It is revealed that with the proposed DTCs installed at midspan, the maximum defl ection of the prestressed concrete T-girder bridge reduces 12.8% in the most unfavorable load case. In all the discussed load cases, the Von Mises stress of the proposed DTCs is within the reasonable range and can be borne by normal steel material. Additionally, connection methods have been given for the DTCs’ application to new bridge and existing bridge. For the use of chemical anchor in existing bridge, the concrete and prestress tendons should be checked in case of any additional damage during the installing of the DTCs.
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Peng Hou,Caiqian Yang,Jing Yang,Yong Pan 대한토목학회 2024 KSCE Journal of Civil Engineering Vol.28 No.2
In this study, a finite element (FE) model of the Xiuzhen River bridge was developed, and the validity of the model was verified using monitoring results, load tests and theoretical calculations. Subsequently, a series of FE simulations were conducted on a model of the Xiuzhen River Bridge strengthened using K-brace composite trusses (K-BCTs). Static, eigenvalue and response spectrum analyses were carried out for 16 prestressed concrete box-girder (PCB) bridge strengthening models with different K-BCT stiffness and spacing. The results revealed that K-BCTs could reduce the girder deflection, improve the load distribution, and reduce the distortion stress. A slightly better-strengthening effect in the K-BCTs with higher stiffness and smaller spacing. The dynamic analysis revealed that the K-BCT stiffness and spacing influenced the higher vibration modes but had little effect on the lower modes. Furthermore, the K-BCT had no significant effect on the maximum internal force of the model under different seismic waves, and the maximum deviation was within 5%. Finally, two K-BCTs made of concrete-filled steel tubes, with a spacing of 3 m and an elastic modulus of 50 GPa, were used to strengthen the existing bridge. The experiment results indicated that the strain and deflection in the Xiuzhen River Bridge were reduced by 53.6% and 20.6%, respectively.
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