This loading is to be adopted within certain municipal limits,in certain existing or contemplated industrial areas,in other specified areas. Comparative study of grillage method and finite element. I suggest you to listen to the video and make notes of your own, that makes you confident if you still want to download it, its not free please click th. Staad pro bridge deck analysis using stadd beava on irc code duration. Irc class aa loading contains either a tracked vehicle of 70 tonnes or a wheeled vehicle of 40 tonnes with dimensions. Class b loading this loading is to be normally adopt. A bridge of class 3 can carry a jeep, class 9 can carry a truck, class 50 can carry a centurian tank moving on its own power and class 70 can carry the same tank when carried over a trailer. Configuations intended for class aa ought to be checked for irc class a stacking likewise, since under specific conditions, bigger loads might be gotten under class a stacking. For class aa loading and class 70r loading, a for spans less than 9m. Class a loading ithis loading is to be nornmlly adopted on all roads on which permanent bridges and culverts are constructed. Irc class aa loading consist of either tracked vehicle of 70 tons or wheeled vehicle of 40 tons. The deck also carries a 80 tons level lauffing crane.
How can i generate irc loading in staad bentley communities. As black cotton soil is met within the foundation, it was proposed to provide 450 mm diameter rcc underream piles foundation for supporting the retaining wall. The highway authorities decide the class of loading a bridge or all bridges on a highway stretch are to be designed. Irc class aa loading longitudinal girder and cross girder design.
The international code council icc is a nonprofit organization dedicated to developing model codes and standards used in the design, build and compliance process. Load testing of bridge on dedicated freight corridor near aligarh duration. Based upon loading irc class aa loading bridge irc class a loading bridge irc class b bridge. Explain the procedure for shear stress calculation in solid slab bridges part b 1. Irc class aa loading in existing industrial areas, civil. This type of loading is used in the design of all permanent bridges. Normally, bridges on national irc class aa loading consists of either a tracked vehicle of 70 tonnes or a wheeled vehicle of 40 tonnes with dimensions. These vehicle classifications have also been included in the irc bridge code. For irc class aa or 70r loading 1 for spans less than 9 m a for tracked vehicle 25% for spans up to 5 m linearly reducing to 10% for spans of 9 m b for wheeled vehicle 25% 2 for spans of 9 m and above a for tracked vehicle for rc bridges,10% up to span of 40 m and in. Class a loading consists of a wheel load train composed of a driving vehicle and two trailers of specified axle spacings. When we design a bridge using class aa type loading, then it must be checked for class a loading also.
Irc class aa loading consists of either a tracked vehicle of 70 tonnes or a wheeled vehicle of 40 tonnes with dimensions as shown in fig. The bridge deck is designed for irc class aa loading tracked vehicle. Impact percentage curve for highway bridges for irc class a and. Class 70 r loading this loading consists of a tracked vehicle of 700 kn or a wheeled vehicle of total load of kn. Different types of loads for designing bridge structures. Explain the irc specifications for live load for irc class 70r loading. Missouri university of science and technology scholars mine. Analysis and design of prestressed box girder bridge by. How to find out the live load bending moment for irc aatrack load. This method may be used for irc class a or class b loading also in the similar manner by placing the single lane or two lanes of vehicles as the case may be in the transverse direction with maximum eccentricity with respect to the centre line of the deck and calculating the equivalent loads at reference stations considering each wheel load as unit load. A bridge is designed for the severe of class70r and classa loading or classa and classaa loading. The international codes icodes are the widely accepted, comprehensive set of model codes used in the us and abroad to help ensure the engineering of safe, sustainable, affordable and resilient structures. The irc class aa loading corresponds to the class 70 loading and is based on the original classification methods of the defense authorities. Pigeaud, are used to get moment coefficients in two directions for the deck slab.
This resource gives the classification of roads based on irc indian road congress standards. In that way the whole static load was considered to transfer to the pile. The units in the figure are mm for length and tonnes for load. Influence of distributed dead loads on vehicle position.
Alternately there is a bridge deck module inside staad. Class a loading consists of a wheel load train composed of a driving. Some of the time class 70 r stacking given in the appendix i of irc. Draw the loading standard for irc class aa loading. For the design of highway bridges, irc code specifies two types of live loads namely class a and class 70r class aa. Both fem and courbons analysis are subjected to irc class aa and irc 70r tracked vehicular loading system in order to obtain maximum bending moment. Civil engineering assignment help, irc class aa loading in existing industrial areas, for irc class aa loading in existing industrial areas, what is load knm has to applied base don the wheel loads.
A bridge is a structure that permits us to cross over an obstacle. Irc class aa this load represents a tracked vehicle simulating an army tank of 700 kn or a wheeled vehicle heavy duty truck of 400 kn. Also calculate the maximum force in diagonal al and bottom chord ab if single lane of irc class aa load crosses the bridge. Irc class a two lane, class aa tracked and wheeled, class 70r tracked and wheeled loads are shown in figs. This loading is normally adopted for temporary structure and bridges in specified areas. A brief introduction for the codal provisions introducted by indian road congress irc 2014 for loads and stress in bridges several loading. Aa loading should be checked for class a loading also,as under certain conditions,heavier stresses may be obtained under class a loading. As per irc, one lane of class70r or two lanes of classa and one lane of class70r with one lane of classa or 3 lanes of classa are to be considered as design live load for condition a and b respectively. Get answer i maximum axle load of irc class a load is. This project helps to improve the urbanization of rural areas also facilitate the connection of various system of road such as village road, state highway, national highway etc. For highways the maximum legal axle load in india, specified by irc, is 10 tonnes. Bridge deck have to be designed for irc loads, specified as class aa or a depending on the importance of the bridge.
Select the position of loads for getting maximum bending moment in solid slab bridges. The maximum allowed axle load on the roads is called legal axle load. For slabs supported on two opposite sides, the maximum bending moment caused by a wheel load may be assumed to be resisted by effective width of slab measured parallel to the supporting edges irc 21. It is a single axle load with dual wheel carrying 80 kn load and the design of pavement is based on the standard axle load. Vehicle live loads are categorized based on their configuration and intensity as irc class 70r, irc class aa tracked and wheeled type, irc class a and irc class b loading. The load on the bridge depends upon the traffic condition or if you constructing bridge in highway then we design the bridge aa class loading condition because in war time maybe tank are going through the rods or bridge. Bridges designes for 70r loading should be checked for class a loading also as under certain conditions,heavier str. The severe class of loading that causes maximum design load for a bridge depends upon the span and end conditions. List elaborately the various types of loadings on the railway and road bridges. Class 24, 40 and 70 correspond to irc class b, a and aa loading respectively. What is a 70r loading class a and a class aa loading. The deck slab is designed for irc class aa loading.
This wharf consists of rcc monoliths with relieving platform. Sometimes class 70 r loading given in the appendix i of irc. The structure is designed as per irc class aa loading. How to generate class aa tracked vehicle load in staad. Analysis and design of prestressed box girder bridge by irc. For the twolane indian highway bridges, irc code recommends that the bridges should be designed class 70r class aa tracked and wheeled vehicles placed on one lane and the bridge need to be checked for class a loading on both the. While designing a bridge with class aa type loading, then it should be examined for class a loading also. Irc recommends bridge designed for class aa loading should also be checked for irc class a loading. This loading is normally adopted on all roads on which permanent bridges and culverts are constructed. With a proven track record of inspection and certification of more than 20 platforms and km of pipelines, our expert team helps the stakeholders to mitigate the risks involved in the design, manufacturing, operations and maintenance phase during the lifecycle of the project. Normally, bridges on national highways and state highways are designed for these loadings.
Design of t beam bridge using wsm2 linkedin slideshare. A reinforced cement concrete bridge deck is designed using the indian roads congress irc bridge code. Arterial roads sub arterial roads collector streets. Bridges designes for class aa loading should be checked for class a loading also. Classification of roads based on irc india study channel. Irc class aa loading and two lane multi lane traffic was expected on the soil behind the wall. Investigations on simply supported concrete bridge deck. Three different wheel arrangements for class 70r wheeled loads are in existence class 70r tracked load may be idealized into 20 point loads of 3. State the various loads and forces to be considered in the design of bridge members. This loading is to be normally adopted on all roads on which permanent bridges and culverts are constructed.