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基于响应面法的悬拼优化施工中混合梁斜拉桥响应分析

Response Analysis of Hybrid Girder Cable-stayed Bridge in Cantilever Assembly Optimization Based on the Response Surface Method

  • 摘要: 为解决大跨斜拉桥悬拼施工过程中桥面吊机对桥梁结构的影响问题,以某大跨径独塔混合梁斜拉桥为背景,采用响应面法(Response Surface Method, RSM)研究悬臂拼装施工过程中,桥面吊机的结构参数对主梁线形、内力、索力的影响规律。以桥面吊机的重量、前后支反力比、支撑跨度和钢箱梁弹性模量作为主要设计参数,以最大悬臂状态下主梁的挠度和成桥状态下主梁的应力、线形和拉索索力作为响应参数构建显式响应方程,求解各设计参数对结构响应的影响程度,对结构参数进行敏感性分析。研究结果表明,桥面吊机的自重、前后支反力比、前后支撑跨度对钢主梁的挠度、内力和成桥索力有显著的影响;在相同条件下,吊机自重每增加10 t,悬臂端挠度增大42.46 cm,成桥索力增大3.16 kN。采用响应面法分析结构参数的影响,研究结果科学准确、简便实用,可以为桥面吊机结构的优化设计、施工中监控关键控制参数提供科学依据,对相同类型的桥梁工程也具有借鉴意义。

     

    Abstract: Aiming at the impact of bridge deck crane on bridge structure during cantilever construction of long-span cable-stayed bridge, taking a long-span single tower hybrid girder cable-stayed bridge as the background, the response surface method(RSM) was used to study the influence of structural parameters of bridge deck crane on main beam alignment, internal force and cable force during cantilever construction. The weight of the bridge deck crane, the front and rear reaction ratio, the front and rear support span and the elastic modulus of the steel box girder were taken as the main design parameters, and the deflection of the main girder under the maximum cantilever state and the stress, alignment and cable force of the main girder under the bridge completion state were taken as the response parameters. The explicit response equation was constructed to solve the influence degree of each design parameter on the structural response, and the sensitivity analysis of the structural parameters was carried out. The results showed that the self-weight of bridge deck crane, the front and rear reaction ratio and the front and rear support span had significant effects on the deflection, internal force and bridge cable force of steel main girder. Under the same conditions, for every 10 t increase in the weight of the crane, the deflection of the cantilever end increased by 42.46 cm, and the cable force of the bridge increased by 3.16 kN. Using the response surface method to analyze the influence of structural parameters, the research results are scientific, accurate, simple and practical, which can provide scientific basis for the optimization design of bridge deck crane structure and the monitoring of key control parameters in construction, and also have reference significance for the same type of bridge engineering.

     

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