MAGAZINES - International Tunneling and Underground Space Association

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 International Tunneling and Underground Space Association


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TECHNOLOGY : EPISODE 12 - FERRO CEMENT

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ENGINEERING LESSONS - EPISODE 7 COMPARISION BETWEEN BOX & T GRDERS

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  This Article is a compilation of the below Technical Papers, only the Essence of the Papers are provided here for quick grab in this section, detail report is attached below. Generally, for Bridge Super Structure we would construct Box Girder, I/T Girders, Void Beam, etc... So, we require a better understanding of Super Structure Section which best suited for a particular Spans, cost wise & Constructability point of views.   Software used: CSI Bridge   FEM method is economical than the one-dimensional analysis.   Box girder is found to be Costlier for 16.3 m Span whereas for 31 m span the box girder is economical. Box girder are more suitable in terms of stability and economy as compared to T beam girder bridge superstructure. For longer spans the depth of T-beam Girder increases drastically which makes it uneconomical. Therefore, for higher spans more than 25m the Box Girder is always suitable due to its higher torsional rigidity. For lesser spans I ...
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ENGINEERING LESSONS: EPISODE 22 - OPTIMIZED LIVE LOADED VIADUCT BRIDGES

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  OPTIMIZED LIVE LOADED VIADUCT BRIDGES In the Present state of the art, a Bridge Engineer usually optimize the design component in four ways. This article will discuss about the possibility to optimize the design loads with  Effective Live Load Concept. Problem Statement: Criteria 1: The vehicle volume in the road is majorly classified into two types namely passenger vehicle segment & 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. As per Indian scenario, IRC Class AA & A are far higher than the normal vehicles. Criteria 2: In a densely populated city there will be always an alternative route to r...
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