斜拉桥钢塔地震损伤特性及输入地震动参数的影响

doi:10.3785/j.issn.1008-973X.2024.04.017

浙江大学学报(工学版)

2024, Vol. 58

Issue (4): 817-827 DOI: 10.3785/j.issn.1008-973X.2024.04.017

土木工程

斜拉桥钢塔地震损伤特性及输入地震动参数的影响

郏洲(

),谢旭*(

),王天佳,成程

1. 浙江大学建筑工程学院，浙江杭州 310058

Seismic damage characteristics of steel tower of cable-stayed bridge and influence of input ground motion parameters

Zhou JIA(

),Xu XIE*(

),Tianjia WANG,Cheng CHENG

1. College of Civil Engineering and Architecture, Zhejiang University, Hangzhou 310058, China

全文: PDF(5212 KB) HTML

摘要：

以主跨为165 m的独塔钢斜拉桥为研究对象，建立精细化钢塔计算模型. 选取经峰值加速度调整后的历史地震记录作为地震动输入，分析顺桥向弹塑性时程反应，研究钢塔的钢板局部失稳以及超低周疲劳开裂特性，讨论纤维模型的适用性. 结果表明，沿高度方向加载的Pushover法能够预测钢塔顺桥向地震塑性发展的顺序和位置；纤维模型能够获得钢塔的弹塑性地震位移反应以及地震损伤位置，不能精确评价结构残余变形与损伤程度；输入地震动的峰值地面速度（PGV）/峰值地面加速度（PGA）值是影响结构地震损伤程度的指标；当PGA相同时，PGV/PGA值越大的地震动引起的钢塔地震损伤越显著，钢塔斜拉桥抗震性能验算应选用PGV/PGA值大的地震动时程.

关键词： 钢塔; 地震损伤; 近断层地震动; 钢板局部失稳; 超低周疲劳损伤

Abstract:

Taking a single-tower steel cable-stayed bridge with a main span of 165 m as a research object, a refined calculation model of the steel tower was established. The historical seismic records adjusted by peak acceleration were selected as the ground motion input for the elasto plastic time-history analysis in the longitudinal direction of the bridge. The local instability of the steel plates and ultra-low cycle fatigue cracking characteristics of the steel tower were studied, and the applicability of the fiber model was discussed. Results show that the Pushover analysis method loaded along the height can predict the sequence and location of the seismic plastic development in the longitudinal direction of the steel tower. Although the fiber model can obtain the elastic-plastic seismic displacement response and the seismic damage location of the steel tower, it cannot accurately evaluate the residual deformation and the damage degree of the structure. The peak ground velocity (PGV)/peak ground acceleration (PGA) value of the input ground motion is an indicator that affects the degree of structural seismic damage. Under the same PGA, the seismic damage of the steel tower caused by ground motions with larger PGV/PGA values is significant. Therefore, the seismic performance verification of steel towers cable-stayed bridges should adopt the ground motion time history with larger PGV/PGA values.

Key words: steel tower seismic damage near-fault ground motions local instability of steel plate ultra-low cycle fatigue damage

收稿日期: 2023-04-08 出版日期: 2024-03-27

CLC:

U 448.27

基金资助: 国家自然科学基金资助项目（52178174，51878606）.

通讯作者: 谢旭 E-mail: 22112280@zju.edu.cn;xiexu@zju.edu.cn

作者简介: 郏洲（1999―），男，硕士生，从事桥梁抗震研究. org.orcid/0009-0002-2580-2432. E-mail：22112280@zju.edu.cn

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引用本文:

郏洲,谢旭,王天佳,成程. 斜拉桥钢塔地震损伤特性及输入地震动参数的影响[J]. 浙江大学学报(工学版), 2024, 58(4): 817-827.

Zhou JIA,Xu XIE,Tianjia WANG,Cheng CHENG. Seismic damage characteristics of steel tower of cable-stayed bridge and influence of input ground motion parameters. Journal of ZheJiang University (Engineering Science), 2024, 58(4): 817-827.

链接本文:

https://www.zjujournals.com/eng/CN/10.3785/j.issn.1008-973X.2024.04.017 或 https://www.zjujournals.com/eng/CN/Y2024/V58/I4/817

图 1 斜拉桥概况

表 1 主塔截面参数

表 2 塔底截面钢板宽厚比

图 2 钢板位置

图 3 桥梁设计反应谱

图 4 桥梁计算模型

表 3 Q355钢材的Chaboche模型参数

图 5 桥梁主要振型

表 4 桥梁自振特性

图 6 Pushover法加载模式

图 7 Pushover法的计算结果

图 8 输入地震动及反应谱

图 9 桥塔塑性区域分布

表 5 各台站地理位置

图 10 调整后的地震动反应谱

表 6 台站的断层距和地震动的PGV/PGA值

表 7 桥塔地震反应计算结果

图 11 塔底最大等效塑性应变位置的滞回曲线

表 8 台站的断层信息和地震动的PGV/PGA值[27]

表 9 不同断层类型的桥塔地震反应计算结果

图 12 塔底等效塑性应变计算结果以及输出位置

图 13 超低周疲劳验算的子模型

表 10 焊缝材料的Chaboche混合强化模型参数

图 14 地震作用下塔底的空穴成长指数履历

图 15 截面纤维条划分情况

表 11 自振特性比较

表 12 纤维和板壳单元模型的桥塔地震反应计算结果比较

图 16 不同模型塔底最大等效塑性应变位置的滞回曲线

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