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出 处:《桥梁建设》2017年第6期48-53,共6页Bridge Construction
基 金:国家自然科学基金项目(51378503);中国铁路总公司科技研究开发计划项目(2015G001-K)~~
摘 要:针对目前混凝土桥墩缺少日照温度场长期实测样本,以及在温度数据处理中忽略尾部数据偏离主体的最大样本问题,提出采用广义帕累托分布(GPD)模型估计桥墩的温度荷载极值。以昌吉赣客运专线某大桥混凝土桥墩(墩高35m)为例,基于其1年的实测温度数据,分析了不同季节沿桥墩壁厚方向的温度分布及时程变化特征,采用GPD模型对桥墩100年重现期下的温差极值进行了估计,提出了高墩温度荷载的最不利组合。结果表明:桥墩温度变化具有明显的季节性规律,最大温差分别发生在近东侧11:00左右和近西侧18:00左右;采用GPD模型估计的100年重现期温差极值能对实测最大日温差进行较好的包络;温度变形计算时,应同时考虑桥墩顺桥向、横桥向的极值温差作用。For lack of the long-term m easurem ent sam ples of the solar tem perature fields ofconcrete bridge pier at present and owing to the problem of neglecting the deviation of the tail datafrom the m ain m axim um sam ple in the tem perature data processing, the estim ation of the tem peratureload extrem e value of the pier based on the G eneralized Pareto D istribution (G PD ) model wasproposed. T he concrete tall pier (35 m high) of a bridge on N anchang-Ji’an-G anzhou PassengerDedicated Railw ay w as cited as exam ple and the characteristics of the tem perature distribution andtim e-history variation along the wall thickness of the pier in the different seasons w ere analyzedbased on the tem perature data m easured in 1 year. T he tem perature difference extrem e value of thepier corresponding to that in the 100-year return period w as estim ated, using the GPD model andthe w orst tem perature load com bination of the pier was put forw ard. T he results dem onstrate thatthe tem perature variation of the pier has rem arkable seasonal law and the m axim um tem peraturedifferences appear respectively on the near east side of the pier at about 11 : 00 and on the near w estside at about 1 8 : 00. T he tem perature difference extrem e value of the pier of the 100-year returnperiod estim ated by the GPD model can well envelope the m easured m axim um daily tem peraturedifference. W hen the tem perature deform ation of the pier is calculated, the action of the extrem etem perature differences in the longitudinal and transverse directions of the bridge should be sim ultaneouslyconsidered.
关 键 词:高速铁路桥梁 桥墩 混凝土 温度荷载 广义帕累托分布 温差极值
分 类 号:U448.13[建筑科学—桥梁与隧道工程] U442.59[交通运输工程—道路与铁道工程]
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