低荷载等级桥梁限载取值分析
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摘要
目前,我国超载超重车辆对公路桥梁造成越来越严重的危害,针对此种情况,提出了一种基于可靠度理论的限载方法。首先以三轴载重汽车为典型限载模型,建立典型车辆的限载模型,然后求得相应于三轴载重汽车的桥梁限载系数。在此基础上得到典型车辆荷载下低荷载设计等级桥梁的限载值。结果表明:汽-15级设计的桥梁限载值大小不仅与活恒载比值有关,而且与跨径大小有一定联系。这对遏制中小跨径低荷载等级桥梁的超载现象有很大的帮助。
In view of more and more serious damage of highways and bridges caused by the overload vehicles at present in China,a load limit method based on reliability theory is proposed. Firstly,a load limit model of a typical vehicle is established using a three-axle truck as a typical load-limit model,and then the load limit factor of the bridge corresponding to the three-axle truck is obtained. On this basis,the load limit value of the low-load design grade bridge under typical vehicle load is obtained. The results show that,the bridge load limit value of the automobile-15 grade design is not only related to the live dead load ratio,but also has a certain relationship with the span size,which is very helpful to restrain the overloading of small-medium span and low load grade bridges.
In view of more and more serious damage of highways and bridges caused by the overload vehicles at present in China,a load limit method based on reliability theory is proposed. Firstly,a load limit model of a typical vehicle is established using a three-axle truck as a typical load-limit model,and then the load limit factor of the bridge corresponding to the three-axle truck is obtained. On this basis,the load limit value of the low-load design grade bridge under typical vehicle load is obtained. The results show that,the bridge load limit value of the automobile-15 grade design is not only related to the live dead load ratio,but also has a certain relationship with the span size,which is very helpful to restrain the overloading of small-medium span and low load grade bridges.
引文
[1] 谢泽龙.中小跨径PC简支梁桥超载超限运输适应性研究[D].重庆:重庆交通大学,2011.
[2] 徐冲.超载下既有桥梁加固后疲劳性能试验研究[D].杭州:浙江大学,2011.
[3] 孙晓燕,王海龙,黄承逵.超载运营对服役桥梁受弯性能影响的试验研究[J].浙江大学学报,2008,42(1):152-154.
[4] Ghosn M.Development of truck weight regulations using br-idge reliability model[J].Journal of Bridge Engineering,2000,5(4):293-303.
[5] James S.Noel,Peter B.Keating,Michael J.Mattox,et al.Overlaod Permit Procedures.FHWA/TX-92-1226,Texas Transportation Institute,Texas A&M University,1992,3-9.
[6] 张俊平,刘爱荣,等.亚健康桥梁运营车辆荷载限制的理论分析[J].中山大学学报,2010,49(1):34-38.
[7] JTJ 021—85,公路桥涵设计通用规范[S].
[8] JTG D60—2015,公路桥涵设计通用规范[S].
[9] 梁鹏,龙涛,等.我国桥梁汽车荷载演变及其效应分析[J].公路,2011(11):86-94.
[10] GB/T 50283—1999,公路工程结构可靠度设计统一标准[S].
[11] 叶见曙.结构设计原理[M].北京人民交通出版社,2013.
[12] 李松辉.公路桥梁限载取值的可靠性分析模型研究[J].土木工程学报,2013,46(9):83-90.
[13] 李松辉,蒋含莞.不同抗力水平公路桥梁限载分析模型[J].土木工程学报,2016,46(6):76-83.
[14] 何伦杰,唐焱.考虑铺装的正交异性钢桥面系力学性能研究[J].工程建设,2019,51(2):1-6.
[2] 徐冲.超载下既有桥梁加固后疲劳性能试验研究[D].杭州:浙江大学,2011.
[3] 孙晓燕,王海龙,黄承逵.超载运营对服役桥梁受弯性能影响的试验研究[J].浙江大学学报,2008,42(1):152-154.
[4] Ghosn M.Development of truck weight regulations using br-idge reliability model[J].Journal of Bridge Engineering,2000,5(4):293-303.
[5] James S.Noel,Peter B.Keating,Michael J.Mattox,et al.Overlaod Permit Procedures.FHWA/TX-92-1226,Texas Transportation Institute,Texas A&M University,1992,3-9.
[6] 张俊平,刘爱荣,等.亚健康桥梁运营车辆荷载限制的理论分析[J].中山大学学报,2010,49(1):34-38.
[7] JTJ 021—85,公路桥涵设计通用规范[S].
[8] JTG D60—2015,公路桥涵设计通用规范[S].
[9] 梁鹏,龙涛,等.我国桥梁汽车荷载演变及其效应分析[J].公路,2011(11):86-94.
[10] GB/T 50283—1999,公路工程结构可靠度设计统一标准[S].
[11] 叶见曙.结构设计原理[M].北京人民交通出版社,2013.
[12] 李松辉.公路桥梁限载取值的可靠性分析模型研究[J].土木工程学报,2013,46(9):83-90.
[13] 李松辉,蒋含莞.不同抗力水平公路桥梁限载分析模型[J].土木工程学报,2016,46(6):76-83.
[14] 何伦杰,唐焱.考虑铺装的正交异性钢桥面系力学性能研究[J].工程建设,2019,51(2):1-6.
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