Dynamic response analysis of a long-span bridge with thin-walled high piers in valley terrain under combined wind and seismic effects

IF 5.7 1区工程技术 Q1 ENGINEERING, CIVIL

Thin-Walled Structures Pub Date : 2025-03-17 DOI:10.1016/j.tws.2025.113207

Lijia Jin , Jisai Fu , Jianwen Liang , Yue Liu

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引用次数: 0

Abstract

This study investigates the dynamic response of a long-span bridge with thin-walled high piers in a valley terrain under combined wind and seismic effects and proposes a comprehensive analysis method. The contribution of this method is its ability to account for various factors such as the wind environment at the bridge site, fluctuating wind fields, seismic source parameters, propagation paths, and terrain effects, while also considering the dynamic coupling between wind and seismic loads. The study begins by employing computational fluid dynamics to obtain wind parameters at the bridge site, which are validated through comparison with on-site measurements. The spectral representation method is then applied to simulate the fluctuating wind field around the bridge. Seismic motion in the valley area is modeled using a combined frequency-wavenumber and finite element method. Finally, the dynamic response of the bridge under combined wind and seismic loads is analyzed using the finite element method. The focus of the study is on the dynamic response of the bridge under the combined influence of wind and seismic loads, as well as the individual effects of both. Additionally, the impact of the wind environment at the bridge site and terrain effects on the dynamic response of the bridge under combined loading is explored. Results show that, compared to seismic load alone, the inclusion of wind load increases the transverse vibration of the main girder, with a peak displacement increase of approximately 58 %. The displacement response under combined wind and seismic effects is about 17 % lower than the sum of individual responses. The reference wind speed at the bridge deck has a critical value for the dynamic response of the bridge under combined wind and seismic actions. Terrain effects significantly influence the relative displacement of short piers, while having less impact on tall piers.

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来源期刊

Thin-Walled Structures 工程技术-工程：土木

CiteScore

9.60

自引率

20.30%

发文量

801

审稿时长

66 days

期刊介绍： Thin-walled structures comprises an important and growing proportion of engineering construction with areas of application becoming increasingly diverse, ranging from aircraft, bridges, ships and oil rigs to storage vessels, industrial buildings and warehouses. Many factors, including cost and weight economy, new materials and processes and the growth of powerful methods of analysis have contributed to this growth, and led to the need for a journal which concentrates specifically on structures in which problems arise due to the thinness of the walls. This field includes cold– formed sections, plate and shell structures, reinforced plastics structures and aluminium structures, and is of importance in many branches of engineering. The primary criterion for consideration of papers in Thin–Walled Structures is that they must be concerned with thin–walled structures or the basic problems inherent in thin–walled structures. Provided this criterion is satisfied no restriction is placed on the type of construction, material or field of application. Papers on theory, experiment, design, etc., are published and it is expected that many papers will contain aspects of all three.