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中南大学学报(自然科学版)

Journal of Central South University

第49卷    第7期    总第287期    2018年7月

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文章编号:1672-7207(2018)07-1793-06
基于反应谱法的低重心斜拉桥判定简化计算
张文学,陈盈,寇文琦,汪振

(北京工业大学 建筑工程学院,北京,100124)

摘 要: 为便于斜拉桥抗震方案比选,建立全漂浮体系斜拉桥反向双质点简化分析模型和纵向铰接体系斜拉桥双质点简化分析模型,并推导2种体系斜拉桥纵向一阶自振周期的简化计算公式。根据反应谱计算理论得到全漂浮体系和纵向铰接体系斜拉桥塔底弯矩的简化计算公式,提出简化的低重心斜拉桥判定公式,并与10座已建斜拉桥的有限元计算结果进行对比验证,弯矩吻合良好。研究结果表明:2种不同体系斜拉桥纵向一阶自振周期简化计算公式均具有较高的计算精度,基于反应谱法提出的低重心斜拉桥简化判定公式具有较高的可靠性,可为斜拉桥初步设计时抗震方案必选提供参考。

 

关键词: 斜拉桥;漂浮体系;纵向铰接体系;双质点模型;低重心

Simplified criterion for low gravity center cable-stayed bridge based on response spectrum
ZHANG Wenxue, CHEN Ying, KOU Wenqi, WANG Zhen

College of Architecture and Civil Engineering, Beijing University of Technology, Beijing 100124, China

Abstract:In order to make scheme comparison of cable-stayed bridges convenient, the reverse double-mass model for full floating cable-stayed bridges and the double-mass model for fixed hinge cable-stayed bridges were developed, and based on the simplified models, the formulas were derived. Then, on the basis of the double-mass models and the response spectrum, the simplified calculation of the bottom bending moment and simplified criterion of low gravity center cable-stayed bridges were put forward. Finally, the proposed models and simplified calculation were evaluated by the tests on ten built-up bridges and the simplified calculation results were matched well with those analyzed by finite element method. The results show that the two simplified models have higher accuracy and the criterion of low gravity center cable-stayed bridge is reliable, they can be adopted in preliminary design and scheme comparison of cable-stayed bridges.

 

Key words: cable-stayed bridges; full floating system; fixed hinge system; double-mass models; low gravity center

中南大学学报(自然科学版)
  ISSN 1672-7207
CN 43-1426/N
ZDXZAC
中南大学学报(英文版)
  ISSN 2095-2899
CN 43-1516/TB
JCSTFT
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