地震激励下斜拉桥横向支承体系力学参数联合优化

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摘要以某斜拉桥为算例，通过非线性动力时程分析，研究横向支承体系关键力学参数对结构地震响应的影响。分别运用正交试验设计法和控制变量法对桥墩单向可动支座屈服力和桥塔抗风支座初始间隙进行参数联合优化。结果表明：多因子优化时，控制变量法已无法适用，而正交试验设计法不但有效且计算效率高；双因子优化时,两种方法结果相同，但正交试验设计法可量化参数之间的正交与耦合性。高墩上支座的屈服力与桥塔抗风支座初始间隙具有较强的正交性，互相影响的显著性较低，参数优化时可以单独考虑；矮墩上支座的屈服力与桥塔抗风支座初始间隙表现出较强的耦合性，参数优化时需联合考虑。

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	赵国辉1
	潘佑东1
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关键词 ：斜拉桥, 支承体系, 力学参数, 联合优化, 正交试验设计

Abstract：Taking a cable-stayed bridge as an example, the influence of key mechanical parameters of lateral bearing system on structural seismic response was studied by nonlinear dynamic time-history analysis. Orthogonal test design method and controlling variable method were used to jointly optimize the yield force of unidirectional movable bearings on piers and the initial clearance of anti-wind bearings on pylons. It was shown that controlling variable method is no longer applicable to multi-factor optimization, but orthogonal test design method is effective and efficient in calculation; the two methods results are the same in two-factor optimization, but orthogonality and coupling between the parameters are quantified by orthogonal test design method. Strong orthogonality with low mutual-influence significance is observed between the bearing yield force on the high pier and the initial anti-wind bearing clearance on pylons, so they can be considered separately in parameter optimization; a strong coupling is shown between the bearing yield force on the low pier and the initial anti-wind bearing clearance on pylons, so they need to be considered jointly in parameter optimization.

Key words： Cable-stayed bridge Bearing system Mechanical parameters Joint optimization Orthogonal test design

收稿日期: 2020-06-29 出版日期: 2021-11-15

引用本文:

赵国辉1，潘佑东1,2. 地震激励下斜拉桥横向支承体系力学参数联合优化[J]. 振动与冲击, 2021, 40(21): 234-241.
ZHAO Guohui1, PAN Youdong1,2. Joint optimization of mechanical parameters of lateral support system of cable stayed bridge under earthquake excitation. JOURNAL OF VIBRATION AND SHOCK, 2021, 40(21): 234-241.

链接本文:

http://jvs.sjtu.edu.cn/CN/ 或 http://jvs.sjtu.edu.cn/CN/Y2021/V40/I21/234

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