多地区重载交通下装配式简支T梁桥响应特征研究及安全评价
发布时间：2019-05-11 19:11
【摘要】：近年来，超重车导致桥梁垮塌事故时有发生，重载交通在桥梁结构上行驶时，对桥梁结构的使用性能和耐久性造成非常重大的影响。中小跨径桥梁在高速公路桥梁中占了很大一部分比重，因此研究中小跨径桥梁在特重车作用下桥梁结构的动力响应具有非常重要的意义。本文基于三个不同地区长期监测的交通荷载信息，利用课题组自行研发的BDANS桥梁计算软件中的随机车流－桥梁耦合振动分析模块计算了高速公路常见的5座装配式预应力简支T梁桥的内力效应，并基于实测数据和响应分析结果对重载交通下简支T梁桥的安全性进行评价。 主要研究内容如下： 1、利用安装于测试桥梁桥头位置处的健康监测系统采集交通荷载数据，，包括车型、车重、轴重、车速、车长及车辆横向行驶位置等。定义并提取了特重车交通荷载工况，分析了实际交通流荷载工况的行车特点，讨论了实际交通与桥梁设计荷载之间的关系。 2、根据2006年交通部制定的《公路桥涵通用图-装配式预应力混凝土T梁桥（简支体系）上部构造》建立5种跨径的公路桥梁中常见装配式预应力简支T梁桥的有限元模型，跨径包括20m、25m、30m、35m和40m。计算中美英欧四种规范设计荷载作用下桥梁结构的内力效应值，评价中国规范设计荷载取值的水平。 3、采用随机车流-桥梁耦合振动分析模块计算三个地区采集的实际交通流作用下简支T梁桥的内力效应值，并与公路Ⅰ级设计荷载作用下桥梁内力效应进行对比，分析5座简支T梁桥内力效应与各个地区实际交通流行车特点的关系。 4、分析三个地区特重车内力超限特点，研究特重车车型、车重、行驶位置对桥梁内力的影响，并以随机车流-桥梁耦合振动分析系统为平台，采用中国规范中承载力评定方法评价三个地区特重车通行时桥梁的安全性能，对重载交通下桥梁安全进行评价。
[Abstract]:In recent years, superheavy vehicles lead to bridge collapse accidents from time to time. When heavy traffic is running on bridge structures, it has a great impact on the performance and durability of bridge structures. Small and medium-span bridges account for a large proportion of expressway bridges, so it is of great significance to study the dynamic response of small and medium-span bridges under the action of special vehicles. This paper is based on the traffic load information monitored for a long time in three different areas. The internal force effect of five assembled prestressed simply supported T-beam bridges in expressway is calculated by using the random traffic flow-bridge coupling vibration analysis module in the BDANS bridge calculation software developed by the research group. Based on the measured data and response analysis results, the safety of simply supported T-beam bridge under heavy load traffic is evaluated. The main research contents are as follows: 1. The traffic load data are collected by using the health monitoring system installed at the bridge head position of the test bridge, including vehicle type, vehicle weight, axle load, speed, vehicle length and lateral driving position of the vehicle. The traffic load condition of special heavy vehicle is defined and extracted, the driving characteristics of actual traffic flow load condition are analyzed, and the relationship between actual traffic and bridge design load is discussed. 2. According to the superstructure of highway bridge and culvert general diagram-assembled prestressed concrete T-beam bridge (simply supported system) formulated by the Ministry of Communications in 2006, the finite element model of common assembled prestressed simply supported T-beam bridge in five kinds of highway bridges is established. The span includes 20m, 25m, 30m, 35m and 40m. The internal force effect of bridge structure under the action of four kinds of code design loads in China, the United States, Britain and Europe is calculated, and the level of design load value in Chinese code is evaluated. 3. The coupling vibration analysis module of random traffic flow and bridge is used to calculate the internal force effect value of simply supported T-beam bridge under the actual traffic flow collected in three areas, and the internal force effect of the bridge under the action of grade I design load is compared with that of the bridge under the action of grade I design load. The relationship between the internal force effect of five simply supported T-beam bridges and the actual traffic flow characteristics in each area is analyzed. 4. the internal force overrun characteristics of heavy vehicles in three areas are analyzed, and the influence of vehicle type, vehicle weight and driving position on the internal force of bridges is studied, and the random traffic flow-bridge coupling vibration analysis system is used as the platform. The safety performance of bridges in three areas is evaluated by using the evaluation method of bearing capacity in Chinese code, and the safety of bridges under heavy load traffic is evaluated.
【学位授予单位】：长安大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U441.3
本文编号：2474774
[Abstract]:In recent years, superheavy vehicles lead to bridge collapse accidents from time to time. When heavy traffic is running on bridge structures, it has a great impact on the performance and durability of bridge structures. Small and medium-span bridges account for a large proportion of expressway bridges, so it is of great significance to study the dynamic response of small and medium-span bridges under the action of special vehicles. This paper is based on the traffic load information monitored for a long time in three different areas. The internal force effect of five assembled prestressed simply supported T-beam bridges in expressway is calculated by using the random traffic flow-bridge coupling vibration analysis module in the BDANS bridge calculation software developed by the research group. Based on the measured data and response analysis results, the safety of simply supported T-beam bridge under heavy load traffic is evaluated. The main research contents are as follows: 1. The traffic load data are collected by using the health monitoring system installed at the bridge head position of the test bridge, including vehicle type, vehicle weight, axle load, speed, vehicle length and lateral driving position of the vehicle. The traffic load condition of special heavy vehicle is defined and extracted, the driving characteristics of actual traffic flow load condition are analyzed, and the relationship between actual traffic and bridge design load is discussed. 2. According to the superstructure of highway bridge and culvert general diagram-assembled prestressed concrete T-beam bridge (simply supported system) formulated by the Ministry of Communications in 2006, the finite element model of common assembled prestressed simply supported T-beam bridge in five kinds of highway bridges is established. The span includes 20m, 25m, 30m, 35m and 40m. The internal force effect of bridge structure under the action of four kinds of code design loads in China, the United States, Britain and Europe is calculated, and the level of design load value in Chinese code is evaluated. 3. The coupling vibration analysis module of random traffic flow and bridge is used to calculate the internal force effect value of simply supported T-beam bridge under the actual traffic flow collected in three areas, and the internal force effect of the bridge under the action of grade I design load is compared with that of the bridge under the action of grade I design load. The relationship between the internal force effect of five simply supported T-beam bridges and the actual traffic flow characteristics in each area is analyzed. 4. the internal force overrun characteristics of heavy vehicles in three areas are analyzed, and the influence of vehicle type, vehicle weight and driving position on the internal force of bridges is studied, and the random traffic flow-bridge coupling vibration analysis system is used as the platform. The safety performance of bridges in three areas is evaluated by using the evaluation method of bearing capacity in Chinese code, and the safety of bridges under heavy load traffic is evaluated.
【学位授予单位】：长安大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U441.3
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本文编号：2474774
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