'Built-Up Beams: Curtailment of the Flange Plates and Shear Connections' Video Lecture by Prof. Damodar. They are mainly used in bridges. Splices in the web of the plate girder are designed to resist the shear and moment at the spliced section. The splice plates are provided on each side of the web. A joint in the flange element provided to increase the length of flange plate is known as flange splice. Mod-6 Lec-6 Built-Up Beams: Curtailment of the Flange Plates and Shear Connections lecture from Design of Steel Structures course, by Indian Institute of.
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Overview[ edit ] In a plate girder bridge, the plate girders are typically I-beams made up from separate structural steel plates rather than rolled as a single cross-sectionwhich are welded or, in older bridges, bolted or curtailment of flange plates together to form the vertical web and horizontal flanges of the beam.
Answers and Solutions
In some cases, the plate girders may be formed in a Z-shape rather than I-shape. The first tubular wrought iron plate girder bridge was built in by James Millholland for the Baltimore and Ohio Railroad.
Plate girders are usually prefabricated and the length limit is frequently set by the mode of transportation used to move the girder from the bridge shop to the bridge site. Stresses on the flanges near the centre of the span are greater than near the end of the span, so the top and bottom flange plates are frequently reinforced in curtailment of flange plates middle portion of the span.
Based on the variation of the bending moment the girder section can be suitably varied. Such variation can be done by curtailment of cover plate or alternatively single flange plates can be reduced in curtailment of flange plates where the reduction in bending moment permits.
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In the case of simply supported girders in which the maximum bending moment occurs at the centre the depth can be varied as shown in Fig. This type of girders has become obsolete in modern times.
In rigid frame constructions and continuous beams large moments occurs at the supports. The girders may be haunched near the support to provide greater flexural strength.
Present day plate girders are made of plate elements only.
Accurate method of curtailment In this method, the moment of resistance of the section with modified flange plate is calculated and the point at which the envelope of maximum bending moment will be equal to curtailment of flange plates moment of resistance, will be the theoretical point at which curtailment of flange plates plate may be modified.
Since the maximum moment at each point results from a different position of the moving live load, the envelope is not the same thing as a moment diagram.
For uniformly loaded simply supported beam, B. M and M n is the moment of resistance of the section after modifying the flange plate and L n the length of plate, hence; 13 13 as before for plate girder supports moving load.
AspireBuzz | Statement (I): At positions of curtailment of f
Where vertical stiffeners are required, they should be provided throughout the length of the girder at a distance not greater than 1. When horizontal stiffeners area provided d1 should be taken as the clear distance curtailment of flange plates the horizontal stiffener and tension flange farthest flange ignoring fillets.
Permitted clear distance between vertical stiffener for thickness t.