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Research on Dynamic Performance of Prestressing Combined Box Girder with Corrugated Steel Webs

Author: ChenJianBo
Tutor: LiuBaoDong
School: Beijing Jiaotong University
Course: Bridge and Tunnel Engineering
Keywords: Corrugated Steel Box Girder Dynamic performance External prestressing Model test Bridge pier Earthquake response
CLC: U441.3
Type: Master's thesis
Year: 2011
Downloads: 63
Quote: 1
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Abstract


Corrugated steel webs external prestressed box girder is the emerging portfolio structure at home and abroad , with a gravity and seismic performance , the prestressed use efficiency advantages , has attracted wide attention both at home and abroad . Departure from the dynamic characteristics and dynamic performance through theoretical calculations , model tests and finite element simulation , the combination box girder with corrugated steel webs . The main work is as follows : ( 1) consider the corrugated steel web box girder shear deformation and prestressed corrugated steel webs natural vibration frequency of prestressed concrete composite box formula section stiffness increases . A numerical example to verify the validity of the formula , and consider the impact of the natural frequency of the loss of prestress and concrete age . (2) in the prestressed tension stage , respectively, carried out on the the 3 corrugated steel webs test box beam power test results show that : with the in vitro tendon tensile stress increased , the first order of the test beam natural frequencies improve . In this paper, the formula vibration frequency of the calculated and measured values ??are in good agreement compared with the calculation method of the elementary beam theory and Miyamoto verify the validity of the formula . ( 3 ) design and preparation of the corrugated steel webs rigid frame bridge and concrete rigid frame bridge test model , the test model for different cross-section of the pier , the longitudinal bridge to the dynamic characteristics test and finite element simulation and theoretical analysis , the results show that the : same pier conditions , the natural frequency of the rigid frame bridge with corrugated steel webs below concrete rigid frame bridge ; calculated rigid frame bridge vertical bridge beam the pier stiffness than the impact to the natural frequency should be considered . (4 ) establish the finite element model of the corrugated steel webs rigid frame bridge real bridge pier parameters of rigid frame bridge dynamic characteristics and seismic response , and the results show that : the pier , compared with single-walled , double thin-wall pier can effectively reduce the upper structural seismic response of the expense , but the to increase pier bottom axis force ; dual thin-walled pier structure and different spacing greater impact on the internal force distribution .

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CLC: > Transportation > Road transport > Bridges and Culverts > Structural principles, structural mechanics > Bridge vibration and damping device
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