波形钢腹板连续梁桥施工线形控制分析

发布时间：2018-04-14 19:33

本文选题：桥梁工程 + 参数敏感性分析　；参考：《施工技术》2016年S2期

【摘要】：以伊朗德黑兰北部高速公路BR-06L/R特大桥为研究背景,通过对波形钢腹板连续箱梁结构的参数敏感性分析,计算了设计参数对该类桥型施工过程中变形的影响性。通过对弹模、自重、预应力、施工荷载、徐变系数5种参数的敏感性分析,发现各项参数的变化基本与该桥施工变形的变化成线形关系,并通过计算得出各项参数对桥梁结构施工变形的影响程度,且弹模、自重、预应力等参数的影响程度较大,徐变系数对施工变形的影响程度较小。依据各项参数的影响程度,确立了弹模、自重、预应力等作为主要参数,徐变系数作为次要参数,将桥梁施工过程中的变形作为控制目标进行偏差识别,并通过偏差识别进行计算模型的参数修正,从而使得计算的理论值与实测值吻合,最终实现施工过程中对梁段变形的准确预测,并提供了合理的预拱度。
[Abstract]:Based on the research background of the BR-06L/R Bridge of the Northern Tehran Expressway in Iran, the influence of design parameters on the deformation of this type of bridge during construction is calculated by analyzing the sensitivity of the parameters of the continuous box girder structure with corrugated steel webs.Through the sensitivity analysis of elastic modulus, deadweight, prestress, construction load and creep coefficient, it is found that the variation of each parameter is linear with the change of construction deformation of the bridge.The influence degree of the parameters on the construction deformation of the bridge structure is obtained, and the influence degree of the parameters such as elastic modulus, self-weight and prestress is greater, and the creep coefficient has less influence on the construction deformation.According to the influence degree of each parameter, the elastic modulus, weight, prestress and creep coefficient are established as the main parameters and the creep coefficient as the secondary parameter, and the deformation in the construction process of the bridge is regarded as the control object to identify the deviation.The parameters of the calculation model are corrected by the deviation identification, which makes the calculated theoretical value coincide with the measured value, and finally realizes the accurate prediction of the beam deformation during the construction process, and provides a reasonable pre-camber.
【作者单位】：上海建工集团工程研究总院;
【分类号】：U445.4

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