|Table of Contents|

Simplified design of nonlinear damper parameters and longitudinal seismic response cable-stayed bridge based on longitudinal double-degree-of-freedom model(PDF)

长安大学学报（自然科学版）[ISSN:1006-6977/CN:61-1281/TN]

Issue:
2025年6期
Page:
31-41
Research Field:
桥梁智能运维与防灾减灾
Publishing date:

Info

Title:
Simplified design of nonlinear damper parameters and longitudinal seismic response cable-stayed bridge based on longitudinal double-degree-of-freedom model
Author(s):
ZOU De-qiang1; 2;  LIU Xiong2;  HU Rui1; 3;  LI Li-feng1
(1. College of Civil Engineering, Hunan University, Changsha 410082, Hunan, China; 2. China Construction Fifth Engineering Bureau Co., Ltd., Changsha 410004, Hunan, China; 3. Hunan Provincial Communications Planning, Survey & Design Insititute Co., Ltd., Changsha 410219, Hunan, China)
Keywords:
bridge engineering;  damper parameters;  simplification;  long-span cable-stayed bridge;  seismic response
PACS:
U441.3
DOI:
-
Abstract:
In traditional seismic design of cable-stayed bridges, nonlinear time history analysis was typically conducted based on refined finite element dynamic models to obtain structural seismic demands, which were used to optimize damper parameters. To streamline the preliminary design process, a simplified double degree of freedom model(DDFM)was proposed for single-pylon or symmetrically double-pylon cable-stayed bridges. Analytical and energy methods were employed to obtain the fundamental period and the parameters related to mass and stiffness. An equivalent linearization model for viscous dampers was also developed. In addition, the analytical equations for the longitudinal seismic response of long-span cable-stayed bridges equipped with nonlinear viscous dampers were derived. The validity and applicability of the simplified DDFM were verified through comparative analysis with finite element results from an actual bridge. Comparative study results that the rusults differences between the simplified DDFM and the finite element simulations are only 2.05% for the fundamental period and 1.5% for the lateral stiffness, respectively. When the equivalent damping ratio of the viscous damper ranges from 0.1 to 0.8, the errors in the longitudinal seismic demands of key components calculated by the simplified DDFM remain below 20% compared to the finite element results. This study results valuable references for design institutes to develop simplified preliminary design schemes, rapidly assess the dynamic characteristics and longitudinal seismic responses of long-span cable-stayed bridges, and determine reasonable nonlinear parameters for viscous dampers.2 tabs, 9 figs, 23 refs.

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Last Update: 2025-12-20