装配式箱梁桥的特重车响应特征及限载研究

发布时间：2018-02-16 16:37

本文关键词： 装配式箱梁桥设计荷载特重车效应车辆限载超限　出处：《长安大学》2014年硕士论文　论文类型：学位论文

【摘要】：车辆荷载作为公路桥梁设计的主要技术指标，直接影响到桥梁结构的安全性、经济性与耐久性。而我国车辆荷载具有很强的地域性，因此精细化分析桥梁结构在不同地区实测交通流下的响应特征具有十分重要的意义。本文依托国家自然科学基金项目“风-随机车流-桥梁系统气动干扰、精细分析和评价准则研究”（51278064），基于河北、浙江、上海地区采集的交通荷载数据，针对这三个地区的交通荷载特点，以《公路桥梁通用图》中不同跨径的装配式箱型连续梁桥为基础，利用随机车流-桥梁耦合振动分析软件，以数值分析为手段，对装配式箱梁桥的特重车响应特征以及车辆限载进行了系统分析和研究。主要研究内容如下： 1.根据中、美、英、欧四国设计规范的汽车荷载，从荷载取值、设计车道数、冲击系数、纵横向折减上进行了对比；建立不同跨径的装配式箱梁桥模型，分析比较装配式箱梁桥在各规范下的响应特征。结果表明我国桥梁设计规范在四国规范中处于中下等水平。 2.基于实测的交通荷载数据，对各地区特重车的荷载特性进行比较分析，建立不同地区车型参数。利用随机车流-桥梁耦合振动分析软件计算典型箱梁桥的空间响应，并与规范设计荷载效应做比较，得到不同地区的响应特征。 3.基于建立的车辆荷载模型，选取典型车辆不同过桥方式，计算达到设计荷载时对应的车重，提出了限载参考值的确定方法。 4.基于本文计算的车辆限载车重，分析不同地区的内力超限特点。最后基于承载能力极限状态，，对车辆过桥时的桥梁安全进行了评估。
[Abstract]:The vehicle load as the main technical index of highway bridge design, directly affect the safety of bridge structure, economy and durability. But our vehicle load has a strong regional, so meticulous analysis of the bridge structure is very important in the response characteristics of the measured traffic flow under different areas. Based on the National Natural Science Fund project "wind - random traffic bridge system aerodynamic interference, precise analysis and evaluation criteria of" (51278064), based in Hebei, Zhejiang, Shanghai area traffic load data acquisition, according to the traffic load characteristics of the three areas, with different span prefabricated box "highway bridge general map > continuous beam bridge based on coupled vibration analysis software using the random traffic bridge, based on the numerical analysis as a means of prefabricated box girder bridge with super vehicle response characteristics and vehicle load limit in the system Analysis and research. The main contents are as follows:
According to the 1., beauty, Britain, Europe four vehicle load design specifications, from the load value, the number of design lanes, impact coefficient, and compared to the reduction; the assembly type box establish different span bridge model, analysis and comparison of the response characteristics of assembly type box girder bridge in the specification. The results show that China's bridge design specifications at a lower level in the four specification.
2. based on the traffic load of the observed data, a comparative analysis of the load characteristics of each area heavy truck, the establishment of model parameters in different regions. Using the random traffic bridge coupling vibration analysis software calculation of typical box girder bridge spatial response, and compared with the standard design load effect, response characteristics of different regions.
3. based on the vehicle load model is established, the typical vehicles of different bridge mode, corresponding to meet the design load weight, put forward the method to determine the limit load of reference value.
4. based on the calculation of vehicle load limit weight, internal force analysis of the characteristics of different regions. Finally overrun based on limit state of bearing capacity of the bridge, vehicle bridge safety was 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;U448.213

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