Whitepaper on Lightly Loaded Bridge - LLB

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White paper on Lightly Loaded Bridge – LLB A new approach for optimizing a Bridge design!

In the present state of the art, a Bridge Engineer usually optimize the design component in four ways,

But there is a vertical by which a Bridge Engineer can optimize the structural component know as "live load optimization".

Problem Statement: Criteria 1: The vehicle volume in the road is majorly classified into two types namely passenger vehicle segment and commercial vehicle segment. Around 90% of vehicles on road are passenger vehicle segment and only 10% of the vehicle is under commercial vehicle segment. Commercial vehicles are higher weight compared to passenger vehicles. But a Bridge Engineer is pulled to compulsion in designing the bridge for the governing vehicle load that is a commercial vehicle, even though their volume is less compared to a passenger vehicle.

https://www.youtube.com/watch?v=VXPw5hIiMsM&t

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Criteria 2: Let us say in a densely populated city there will be always an alternative route to reach a destiny and this criterion is going to help us to build the solution.

Solution: In common practice, a Bridge Engineer shall design the bridge to carry all type of traffic whose vehicle load which will be in the range of 5 to 15kPa. But now in this new approach, the Bridge Engineer shall design a bridge by controlling the traffic to only passenger segment vehicles whose weight is less than 5 kPa and by restricting the commercial vehicle traffic.

It is a Lightly loaded bridge.

1. Lightly loaded bridge which exclusively caries only passenger vehicle segment which is less than 5 kPa. 2. This concept developed to implement only in the densely populated cities to ease the traffic congestion, where there is an existing alternative route to transport commercial vehicle segments.

https://www.youtube.com/watch?v=VXPw5hIiMsM&t

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Advantages:

Limitation: 1) During a fire in the bridge: If the bridge designed as a lightly loaded bridge with a live load weight of less than 5 kPa then during a fire emergency in the bridge, a fire engine cannot access the spot by traveling over the lightly loaded bridge. Since the bridge is not designed for fire engine vehicle load. But this lightly loaded bridge concept is developed to facilitate inside a city where there will be easy for a fire engine to access the affected area from at-grade to put off the fire.

2) During an accident over the bridge: The same scenario repeats again. In this case, a crane cannot access the location by traveling over the lightly loaded bridge since the bridge is not designed for crane loading. But as mentioned in the previous scenario the crane can access the location by reaching it at-grade.

https://www.youtube.com/watch?v=VXPw5hIiMsM&t