【作者】 薛飞宇；

【导师】 张建仁；

【作者基本信息】 长沙理工大学 ， 桥梁与隧道工程， 2004， 硕士

【摘要】 在桥梁施工过程中结构抗力和荷载效应随时间变化十分明显,对桥梁施工过程及其安全性的影响很大,而目前的桥梁设计规范没有充分考虑施工期结构抗力增长过程和荷载效应的时变性,未能为施工期结构提供较统一的安全要求。这也是施工期结构安全事故大大高于使用期安全事故的重要原因之一。 回顾了国内外施工期可靠性研究现状,本文分析了桥梁施工期荷载的特点及规律,阐述了桥梁施工期荷载调查研究的重要性。文中提出了距离权抗差最小二乘法,且在此基础上建立了非平稳时间序列组合随机过程概率模型,推导了相应的公式,并用MATLAB编制了距离权抗差最小二乘法进行数据拟合计算和非平稳时间序列组合随机过程概率模型的程序。 本文以湖南湘阴湘江大桥为工程背景,对施工期荷载进行了分类,建立了施工期荷载随机过程概率模型,并推导了施工期荷载对现有梁体结构作用的计算公式,在此基础上分析了数据拟合函数和构造的平稳时间序列随机过程概率模型对现场实测数据模拟的准确性。本文的结论为大跨度桥梁施工期荷载研究、设计和计算以及可靠性检验提供了样本模型和参考依据。更多还原

【Abstract】 The structural resistance and the load action vary obviously with time and influence the safety of bridge greatly during construction, and there is no sufficient consideration about them. This is one of the important reasons which cause accidents during construction more than that in service period.This thesis reviews the existing state of research to domestic and international reliability, analyses the rules and characteristics of bridge load, describes the importance of bridge load inverstigation during construction. The method of anti-error least squares of weighted distance is put forward. The nonstationary time series random process model is established. The corresponding formulas are deduced. The programs based on method of anti-error least squares of weighted distance and the nonstationary time series random process model are developed by language MATLAB.According to the site investigation and statistical analysis results of XiangYin Bridge across the XiangJiang River, the loads during construction are classified. The established load model during construction and the deduced formula of action to the structure are proved to be accurate by compareing with the actually measured data. The conclusion of this paper could serve the study and disign of long span bridge, and give the sample model and reference for reliable testing.更多还原