针对超大跨度斜拉桥由于悬臂施工过程中各种误差的累积可能使其恒载效应具有较强的随机特性, 传统的确定性分析方法不能反映这一重要结构特性的问题, 采用Monte Carlo法与有限元法相结合的随机模拟方法, 将斜拉桥的梁段自重、张拉索力看成随机变量, 进行主跨1 088 m的苏通大桥施工过程随机模拟, 研究其恒载效应的频度、均值和标准差。研究表明: 由于结构系统的变异性, 使结构行为呈现一定的随机性;梁段自重、张拉索力变异对钢主梁斜拉桥恒载应力的影响不如对混凝土主梁斜拉桥那么明显, 但其对恒载构形的影响不可忽略。
Abstract
Due to the accumulation of errors during the cantilevel construction of super-long-span cable-stayed bridges, response under dead load may be stochastic and it can not be reflected by the traditional method of deterministic structural analysis. Introducing random simulation method which combinating Monte Carlo method with finite element method, considering self-weight of girder and cable tension as random variable, construction process of Sutong Bridge was simulated and frequency, average value, standard deviation of response under dead load were investigated. The result shows that structure behaviour has the random characteristic due to variation of structure system and it is concluded that the influence on geometry can't be omitted while the influence on stress is small.
关键词
桥梁工程 /
超大跨度斜拉桥 /
随机模拟 /
施工过程 /
恒载效应 /
概率特征
{{custom_keyword}} /
Key words
bridge engineering /
super-long-span cable-stayed bridge /
random simulation /
construction process /
response under dead load /
probabilistic characteristic
{{custom_keyword}} /
中图分类号：
U448.27
{{custom_clc.code}}
({{custom_clc.text}})
{{custom_sec.title}}
{{custom_sec.title}}
{{custom_sec.content}}
参考文献
[1] 李 杰.随机结构系统——分析与建模[M].北京: 科学出版社, 1996.
LI Jie.Stochastic Structural System－Analysis and Modelling[M].Beijing: Science Press, 1996.
[2] SHINOZUKA M.Monte Carlo Solution of Structural Dynamics[J].Computers and Structures, 1972, 3(5): 855-874.
[3] 刘春华, 秦 权.架设阶段悬索桥静力问题的随机有限元分析[J].计算力学学报, 1998, 15(2): 232-235.
LIU Chun-hua, QIN Quan.Static Analysis for Suspension Bridges Under Construction Based on SFEM[J].Journal of Computational Mechanics, 1998, 15(2): 232-235.
[4] 陈铁冰.斜拉桥几何、材料非线性静力分析及其可靠度评估[D].上海: 同济大学, 2000.
CHEN Tie-bing.Geometric and Material Nonlinear Static Analysis and Reliability Evaluation of Cable-Stayed Bridges[D].Shanghai: Tongji University, 2000.
[5] 苏 成, 范学明.考虑材料与荷载变异时崖门大桥施工阶段随机分析[J].桥梁建设, 2003, 33(1): 62-65.
SU Cheng, FAN Xue-ming.Stochastic Analysis of Yamen Bridge at Erection Stage in Consideration of Variant Material and Loading Parameters[J].Bridge Construction, 2003, 33(1): 62-65.
[6] 刘志文, 陈艾荣, 贺拴海.风荷载作用下斜拉桥概率有限元分析[J].长安大学学报: 自然科学版, 2004, 24(2): 53-57.
LIU Zhi-wen, CHEN Ai-rong, HE Shuan-hai.Probabilistic Finite Element Analysis of Cable-Stayed Bridges Under Wind[J].Journal of Chang'an University: Natural Science Edition, 2004, 24(2): 53-57.
[7] 许 俊, 帅长斌.斜拉桥施工控制中混凝土超方影响及纠正[J].华东公路, 2000, 23(1): 7-9.
XU Jun, SHUAI Chang-bin.Concrete Overweight and Adjustment Under Construction of Cable-Stayed Bridges[J].East China Highway, 2000, 23(1): 7-9.
[8] 颜东煌.斜拉桥合理设计状态确定与施工控制[D].长沙: 湖南大学, 2001.
YAN Dong-huang.Determining of Reasonable Design States and Construction Controlling of Cable-Stayed Bridges[D].Changsha: Hunan University, 2001.
[9] 刘 扬, 张建仁, 李传习.混凝土斜拉桥施工期的时变可靠度计算[J].中国公路学报, 2004, 17(3): 31-35.
LIU Yang, ZHANG Jian-ren, LI Chuan-xi.Calculation of Time-Variant Reliability for Concrete Cable-Stayed Bridges During Construction[J].China Journal of Highway and Transport, 2004, 17(3): 31-35.
[10] FLEMING J F.Nonlinear Static Analysis of Cable-Stayed Bridge Structures[J].Computers and Structures, 1979, 10(4): 621-635.
[11] 秦顺全, 刘孝军, 杨光武.宁波招宝山大桥主梁局部拆除设计及施工控制[J].桥梁建设, 2001, 31(3): 8-12.
QIN Shun-quan, LIU Xiao-jun, YANG Guang-wu.Design and Construction Control for the Partial Dismantlement of the Main Girder of Zhaobaoshan Bridge in Ningbo[J].Bridge Construction, 2001, 31(3): 8-12.
{{custom_fnGroup.title_cn}}
脚注
{{custom_fn.content}}
基金
国家自然科学基金重大项目(59895410)
{{custom_fund}}
{{custom_fund}}
PDF全文下载(693 KB)
