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Chapter 12

Chapter 12. Maximum Deflection in Bridges. Category. Max allowable deflection. Railway bridges. L/800. Roadway bridges. L/600. Structural buildings. L/300. Crane track girders. L/800. The elastic deflections of girders due to L.L. (without dynamic effect) shouldn’t exceed:- .

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Chapter 12

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  1. Chapter 12 Maximum Deflection in Bridges

  2. Category Max allowable deflection Railway bridges L/800 Roadway bridges L/600 Structural buildings L/300 Crane track girders L/800 The elastic deflections of girders due to L.L. (without dynamic effect) shouldn’t exceed:-

  3. To cancel the deflection due to dead load a cumber is done during the construction of the beams or trusses, where the structure will be have the required shape after erection. In case of suspension bridges the cumber is done by adding both the deflection due to D.L. and L.L. into consideration. The minimum sections to be used in structural steel works shall be as follows:-

  4. Section Railway bridges Roadway bridges Structural buildings Equal angles unequal angles S.I.B. No20 No16 No12 Channels No16 No12 No8 Plates mm8 8mm 5mm Gusset plates for main truss 12mm 10mm 8mm 75758 65657 45455 75508 65507 45305

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