|Table of Contents|

Damping Design of Semi-floating Main Girder Concrete-filled Steel Tubular Arch Bridge with Viscous Damper(PDF)

《建筑科学与工程学报》[ISSN:1673-2049/CN:61-1442/TU]

Issue:
2022年02期
Page:
36-43
Research Field:
防灾减灾工程
Publishing date:

Info

Title:
Damping Design of Semi-floating Main Girder Concrete-filled Steel Tubular Arch Bridge with Viscous Damper
Author(s):
PENG Yi-hua1; 2; 3;  MAO Li-min2
(1. School of Management Science and Engineering,Guangxi University of Finance and Economics, Nanning 530007, Guangxi, China; 2. Guangxi Communications Design Group Co., Ltd., Nanning 530029, Guangxi, China; 3. School of Civil Engineering, Central South University, Changsha 410075, Hunan, China)
Keywords:
concrete-filled steel tubular arch bridge;  damping design;  nonlinear dynamic time history analysis;  viscous damper;  semi-floating main girder
PACS:
TU318
DOI:
10.19815/j.jace.2021.04060
Abstract:
In order to study the parameter selection and damping effect of viscous damper for long-span semi-floating main girder half through concrete-filled steel tubular arch bridge, taking a half through concrete-filled steel tubular arch bridge with a calculated span of 320 m as the engineering background, the finite element model was established by MIDAS/Civil software. Based on the analysis of dynamic characteristics, the damping scheme of viscous damper was proposed. Based on the nonlinear dynamic time history analysis method, the parameter selection and damping effect of viscous damper were studied. The results show that the longitudinal floating vibration mode of semi-floating main girder half through concrete-filled steel tubular arch bridge appears earlier, and the vibration mode takes a significant proportion in the mass. The allowable longitudinal displacement of the beam end and the damping force that the damper connecting members can bear should be considered in the selection of viscous damper parameters. For the same damping index, the maximum longitudinal displacement response of the main beam end decreases nonlinearly with the increase of the damping coefficient, and the axial force of the damper increases almost linearly with the increase of the damping coefficient. When the damping index changes within the range of 0.2-0.4, the larger the damping index is, the larger the optional range of damping coefficient meeting the requirements of beam end displacement and damping force is. After setting viscous damper, the longitudinal bridge displacement response of beam end decreases significantly, and the longitudinal bridge displacement of arch crown increases. Except that the axial force of arch rib at the vault decreases slightly, the axial force, shear force and bending moment at other places increase, but the absolute value of internal force response is small. The research results can provide reference for the seismic design of similar bridges.

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Last Update: 2022-03-20