Multiple presence statistics for bridge live load based an weigh-in-motion data
Multiple presence statistics for bridge live load based an weigh-in-motion data
复制标题
DOI：
10.3141/2028-14
复制
发表时间：
2007-01-01
影响因子：
1.7
通讯作者：
Nassif, Hani H.
中科院分区：
文献类型：
--
作者：
Gindy, Mayrai;Nassif, Hani H.
进行了一项研究，以确定新泽西州桥梁的卡车负载谱，重点是多辆卡车的存在统计数据。卡车重量数据由新泽西州交通部在 1993 年至 2003 年间从全州 25 个动态称重站点收集（存在一些差距）。这些站点涵盖各种特定站点条件，包括卡车容量、道路和区域类型以及车道数量。对于每辆卡车，记录的参数包括通过时间、速度、行驶车道、轴数、轴荷和间距。特别令人感兴趣的是桥上同时出现的卡车之间的频率和相关性，无论是跟随、并排还是交错。这种多重存在直接影响模拟、活载效应的未来外推以及代码校准。事实上，在 AASHTO LRFD 桥梁设计规范的开发和校准过程中，两辆卡车并排发生的情况已被视为桥梁设计的主导案例。然而，直到最近，多重存在统计数据仍基于对少数站点卡车交通的少量观察。提供了各种卡车装载情况的统计数据，并检查了卡车容量、区域类型、道路类型和桥梁跨度长度对这些统计数据的影响。据观察，卡车数量和桥跨长度对多辆卡车出现的频率有显着影响，而面积和道路类型的影响很小。还观察到，与较长的跨度相比，对于长达 100 It (M m) 的桥梁跨度，后续荷载事件发生百分比的增长率较低，而对于交错荷载模式，情况正好相反。发现并排卡车的频率相对于跨度长度保持相对恒定。
A study was done to determine truck load spectra for bridges in New Jersey with emphasis on multiple truck presence statistics. Truck weight data were collected by the New Jersey Department of Transportation from 25 weigh-in-motion sites throughout the state between 1993 and 2003 (with some gaps). The sites encompass a variety of site-specific conditions, including truck volume, road and area type, and number of lanes. For each truck, the recorded parameters include the time of passage, speed, travel lane, number of axles, and axle loads and spacings. Of particular interest are the frequency and correlation among trucks simultaneously occurring on a bridge either as following, side by side, or staggered. This multiple presence directly affects simulation, future extrapolation of live load effects, and code calibration. In fact, the case of two trucks occurring side by side has been considered the governing case for the design of bridges during the development and calibration of the AASHTO LRFD Bridge Design Specifications. However, until recently, multiple presence statistics have been based on few observations of truck traffic at a small number of sites. Statistics are presented for various truck loading cases, and the effects of truck volume, area type, road type, and bridge span length on such statistics are examined. It is observed that truck volume and bridge span length have a significant effect on the frequency of multiple truck presence, whereas area and road type have only slight effect. It is also observed that the rate of increase in the percent occurrence of following loading events is lower for bridge span lengths of up to 100 It (M m) as compared with longer spans, whereas for staggered loading patterns the opposite is true. The frequency of side-by-side trucks was found to remain relatively constant with respect to span length.