Abstract—

The main focus of this study is to investigate the dynamic responses of a simply supported bridge structure in terms of displacement, speed, and acceleration subjected to vehicles traveling at different speeds. The interaction between a bridge and the vehicles moving on it is a coupled, dynamic problem. Conventionally, most research has been focused on the dynamic or impact response of the bridge, but not of the moving vehicles. For the cases where only the bridge response is desired, the moving vehicles have frequently been approximated to the extreme as a number of moving loads. In India, mainly IRC (Indian Road Congress) Class A and IRC Class B loading are considered in the design of bridges including the impact factor as specified in Indian Road Congress IRC-6. In the present practice in India, the speed of the moving vehicles of IRC class A and B is completely overlooked in the designing of the bridge structures. This article deals with the responses of the bridge due to the moving vehicles of IRC Class A and IRC Class B loading. In this study, six different spans of bridges of 20, 40, 60, 80, 100, and 120 m are considered. Each span has been analyzed separately due to IRC class A and B loading subjected to vehicle speed ranging from 30 to 210 km/h. Dynamic responses (displacement, velocity, acceleration) and the Impact factor of the bridge for each of the six span length subjected to high-speed IRC class A and B loading have been computed in this study. For earthquake resistance design of bridges, in addition to the vibration caused due to wind and earthquake load, vibration caused by high-speed vehicle need to be considered. In this study, this issue has been addressed in detail. The proposed results can be used as a modification of the IRC specifications when dealing with short and long-span highway bridges by selecting the modified impact factor.

中文翻译：

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印度道路国会（IRC）A级和B级载荷引起的车桥动力相互作用研究

摘要-

这项研究的主要重点是研究以不同速度行驶的车辆在位移，速度和加速度方面的简单支撑的桥梁结构的动力响应。桥梁与在其上行驶的车辆之间的相互作用是一个耦合的动态问题。传统上，大多数研究都集中在桥梁的动力或冲击响应上，而不是在行驶中的车辆上。对于仅需要桥梁响应的情况，经常将移动的车辆逼近为极端的许多移动负载。在印度，桥梁设计中主要考虑了IRC（印度公路大会）的A级和IRC B级荷载，包括印度公路大会IRC-6中规定的影响因子。按照印度目前的做法，在桥梁结构的设计中，完全忽略了IRC A级和B级移动车辆的速度。本文讨论了由于IRC A级和IRC B级移动车辆而引起的桥梁响应。在这项研究中，考虑了20 m，40 m，60 m，80 m，100 m和120 m的六种不同跨度的桥梁。由于IRC等级A和B在30至210 km / h的车速下承受负荷，因此分别对每个跨度进行了分析。在这项研究中，已经计算了六种跨度长度中的每一个桥的动力响应（位移，速度，加速度）以及其对高速IRC类A和B载荷的影响因子。对于桥梁的抗震设计，除了因风和地震荷载引起的振动外，还应考虑高速车辆引起的振动。在这项研究中，此问题已得到详细解决。通过选择修改后的影响因子，当处理短跨度和大跨度公路桥梁时，建议的结果可以用作IRC规范的修改。