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Indian Road Congress (IRC) and Bridge Loading Standards: IRC Class AA, 70R, A and B Loading

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Indian Road Congress Indian Road Congress (IRC) is the governing body which decides the rules and regulation along with technical details regarding roads, highways, and bridges. The first loading standard in India was published by IRC in 1958 and subsequently reprinted in 1962 and 1963.   The metric version was introduced in the second revision published in 1964. IRC Bridge Loading Standards The standard IRC loads specified in IRC: 6-2000 are not changed since 1958 and grouped under four categories as detailed below: 1. IRC Class AA Loading In this category, two types of vehicles are specified and they are grouped as tracked vehicle and wheeled vehicles. The tracked vehicle simulating an army tank of 700 KN and wheeled vehicle of 400 KN (a heavy army truck) are standardized for the designing of all the bridges located on National Highways and State Highways. 2. IRC Class 70R Loading The following vehicles are considered for the design under this category: (a)     The
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Truss: Simple, Deficient and Redundant Truss & Determinate and Indeterminate Truss

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  Truss A truss is basically a pin-jointed slender member structure that is used to carry loads. You might have noticed the use of trusses in supporting roofs and bridge decks. The roof trusses and bridge trusses generally use trusses of steel, however, wooden trusses are also used in supporting various structures that are not too heavy. Steel trusses are also used in transmission towers. But notice one thing, in most of the roof and bridge trusses, the members of the truss lies in a single plane whereas, in transmission towers, the truss members do not lie in a single plane.  So, the trusses which have all the members in a single plane are known as plane truss otherwise the truss is known as space truss. In trusses, the connection is supposed to be pin-jointed but in reality, no extra effort is made to make it so. However, the experiments have shown that the results are consistent with the results obtained by considering the joint as a pin joint. Pin-jointed connection in other
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Slope failures, types and causes of slope failures

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Introduction Slope failure is generally the failure of sloped surfaces due to physical factors that may result in loss of properties and even life. Why do we need to understand slope failures? You must have heard about plain and non-plain areas. So, if we talk about it the plain areas are those where the earth or lands do not show any elevation or slight elevations that can be neglected. Non-plain areas are those where the lands have sufficiently larger elevations that need to be considered for any activity. Now, if any land has elevations then it forms slope. For example, consider mountains they generally have slopes though it may be narrow or steep but if any kind of construction or any other activity, if happens there, then, these slopes need to be taken into account and how are they going to affect the outputs of the work going on. But here we will not talk about the difficulty faced for routes and inaccessibility of the area rather we will talk about the physical difficu
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