大跨度多线桥梁活载加载标准研究

发布时间：2018-05-19 21:37

本文选题：多线活载 + 加载标准　；参考：《西南交通大学》2015年硕士论文

【摘要】：随着我国多线铁路桥梁、公铁两用桥甚至是双层铁路桥的大量建设,多线活载加载标准的研究相对滞后,目前我国在此方面的研究多数基于规范的横向折减系数进行组合,而没有考虑活载的概率模型以及不同车辆相遇的概率,因此本文针对多线活载加载标准开展必要的。本文以活载横向折减系数为研究对象,通过对各种车辆(货车、列车及汽车)的统计调查,模拟各自荷载的概率分布密度函数,运用概率论中的K-S检验法进行拟合优度检验,然后参考公路桥梁计算多车道横向折减系数的方法,按照独立重复试验,建立活载横向折减系数与相关变量的关系式,利用概率方法计算出单种线路(客运专线或货运专线)的活载横向折减系数建议值。同时,本文首次将客运专线、货运专线和公路车道荷载综合考虑,计算出不同车道数基于概率理论的各自活载横向折减系数建议值,并将其用于双层铁路桥和公铁两用桥的计算之中。结果表明：(1)单种活载作用于桥梁上时,横向折减系数的大小关系为：货运专线客运专线公路车道。(2)对于只有客运专线或货运专线荷载单独作用于桥梁上时,本文基于概率理论所计算出的横向折减系数基本大于规范值(两车道客运专线除外),并且随着车道数的增加,横向折减系数逐渐减小。(3)对于3种荷载共同作用于桥梁的情况,横向折减系数的大小关系为：客运专线货运专线公路车道。(4)按照本文建议的横向折减系数计算出的公铁两用桥的最大响应值出现在4车道数荷载组合时,双层铁路桥的最大响应出现在6车道满布时,而按照规范横向折减系数,最大响应值均出现在车道荷载满布于桥梁上时,且此值大于根据本文建议的横向折减系数计算出的值。
[Abstract]:With the large number of construction of multi-line railway bridges, double-deck railway bridges and even double-deck railway bridges, the study of multi-line live loading standards is relatively lagging behind. At present, most of the researches in this area are based on the combination of the transversal reduction coefficient of the code. The probability model of live load and the probability of different vehicle encounter are not taken into account. In this paper, the transverse reduction coefficient of live load is taken as the research object. Through the statistical investigation of various vehicles (freight cars, trains and vehicles), the probability distribution density function of each load is simulated, and the K-S test method in probability theory is used to test the goodness of fit. Then, referring to the method of calculating multi-lane transverse reduction coefficient of highway bridge, according to independent repeated test, the relationship between live load transverse reduction coefficient and relevant variables is established. By using the probability method, the suggested value of the live load transverse reduction coefficient for a single line (passenger dedicated line or freight dedicated line) is calculated. At the same time, considering the load of passenger dedicated line, freight dedicated line and highway lane for the first time, the paper calculates the recommended value of the lateral reduction coefficient of live load based on probability theory. It is applied to the calculation of double-deck railway bridge and dual-purpose railway bridge. The results show that when a single type of live load acts on the bridge, the relation of the transverse reduction coefficient is as follows: the highway lane of the freight dedicated passenger dedicated line. 2) when only the load of the passenger dedicated line or the freight dedicated line acts on the bridge alone, Based on the probability theory, the transverse reduction coefficient calculated in this paper is basically larger than the standard value (except for the two-lane passenger dedicated line, and with the increase of the number of lanes, the transverse reduction coefficient decreases gradually.) in the case of the three kinds of loads acting on the bridge together, The relation of the transverse reduction coefficient is as follows: the highway lane of passenger dedicated and freight dedicated line. (4) the maximum response value of the highway bridge calculated according to the transverse reduction coefficient proposed in this paper appears when the load combination of the four lanes is used. The maximum response of the double-deck railway bridge appears when the six lanes are full, but according to the code, the maximum response value appears when the driveway load is full on the bridge, and this value is larger than the value calculated according to the transverse reduction coefficient proposed in this paper.
【学位授予单位】：西南交通大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U441.2

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