现状车载下旧桥承载力评定和可靠度有限元分析
|
摘要
采用三维体元,进行4座旧桥现状车载(大于设计车载的2 5倍)下的有限元分析,对其承载力进行评定。结果表明,4座旧桥中有1座桥必须拆除,2座桥需要适当加固,1座桥不需要加固。用随机有限元计算旧桥在现状车载下的剩余可靠度结果表明,精确的分析模型能挖掘桥梁的承载潜力。用PSAP计算可靠度指标的灵敏度发现,可靠度指标对混凝土弹性模量比活载更敏感。
By 3D solid element method, the finite element analysis was carried out on 4 existing bridges under current vehicle load (which is 25 times higher than the designed vehicle load) and the bearing capacity was (assessed). Evaluation results showed that one bridge among them should be demolished. Two should be strengthened and remained one behaved well under such heavy vehicle loads. The remained reliability of existing bridges under current vehicle load was calculated by stochastic finite element. The results indicate that the potential of bridge bearing capacity can be obtained by analyzing precisely the model. The sensibility of reliability indexes was calculated by program PSAP. It is found that the reliability indexes for concrete modulus of elasticity is more sensitive than that of live load.
By 3D solid element method, the finite element analysis was carried out on 4 existing bridges under current vehicle load (which is 25 times higher than the designed vehicle load) and the bearing capacity was (assessed). Evaluation results showed that one bridge among them should be demolished. Two should be strengthened and remained one behaved well under such heavy vehicle loads. The remained reliability of existing bridges under current vehicle load was calculated by stochastic finite element. The results indicate that the potential of bridge bearing capacity can be obtained by analyzing precisely the model. The sensibility of reliability indexes was calculated by program PSAP. It is found that the reliability indexes for concrete modulus of elasticity is more sensitive than that of live load.
引文
[1] 清华大学土木系.110国道五座旧桥针对现状汽车荷载的上、下部结构评定报告[R].北京:清华大学土木系,2002.
[2] 北京市公路局.京银路昌平地段车辆调查统计表、轴载轴距统计表、车辆轴载统计表、车辆轴距调查统计表、单轮荷载统计表[R].北京:北京市公路局,2001.
[3] 梅 刚,秦 权,林道锦.双峰分布车辆荷载滤过复合更新过程模型[J].北京:清华大学学报(自然科学版),2003,43(10):1394—1404.
[4] 交通部第二公路勘查设计院.公路旧桥承载能力鉴定方法[S].北京:人民交通出版社,1988.
[5] EHGaylord,CNGaylord,JEStallmeyer.StructuralEngineeringHandbook,4thEdition[M].NewYork:MsGraw Hill,1997.
[6] HKadestuncer,Ed.FiniteElementHandbook[M].NewYork:McGraw Hill,1987.
[7] 郭修武,贡金鑫.公路桥梁承载能力极限状态可靠指标的研究[A]."工程结构可靠性"全国第四次学术交流会论文集[C].西安:地震出版社,1995:330—334.
[2] 北京市公路局.京银路昌平地段车辆调查统计表、轴载轴距统计表、车辆轴载统计表、车辆轴距调查统计表、单轮荷载统计表[R].北京:北京市公路局,2001.
[3] 梅 刚,秦 权,林道锦.双峰分布车辆荷载滤过复合更新过程模型[J].北京:清华大学学报(自然科学版),2003,43(10):1394—1404.
[4] 交通部第二公路勘查设计院.公路旧桥承载能力鉴定方法[S].北京:人民交通出版社,1988.
[5] EHGaylord,CNGaylord,JEStallmeyer.StructuralEngineeringHandbook,4thEdition[M].NewYork:MsGraw Hill,1997.
[6] HKadestuncer,Ed.FiniteElementHandbook[M].NewYork:McGraw Hill,1987.
[7] 郭修武,贡金鑫.公路桥梁承载能力极限状态可靠指标的研究[A]."工程结构可靠性"全国第四次学术交流会论文集[C].西安:地震出版社,1995:330—334.
版权所有：© 2023 中国地质图书馆 中国地质调查局地学文献中心