A Study of Vehicle-Bridge Dynamic Interaction due to Indian Road Congress (IRC) Class A and B Loading
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Study of Vehicle-Bridge Dynamic Interaction due to Indian Road Congress (IRC) Class A and B Loading Bindesh Nuniaa,* and T. Rahmana,** a
Civil Engineering Department, National Institute of Technology, Silchar, Assam, India *e-mail: [email protected] **e-mail: [email protected] Received December 27, 2019; revised January 10, 2020; accepted January 11, 2020
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. Keywords: irc loading, moving vehicles, impact factor, vehicle bridge interaction, bridge span length DOI: 10.3103/S0025654420030115
1. INTRODUCTION Research on the dynamic analysis of the vehicle-bridge interaction system is an important area in the field of dynamics. Vibration is an important phenomenon in a bridge, which may cause due to irregularities of bridges, acceleration, braking, and weight of the vehicles. In the meanwhile, this vibration gets transferred to the pier of the bridge, so when a vehicle running with high speed crosses the bridge it may cause damage to the bridge structure. This coupled vibration is a time-dependent dynamic problem. The two subsystems interact with each other through contact forces. Due to the rapid development of highway communication around the world,
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