What is the difference between plate girder and gantry girder?

A plate girder is a general name for any steel beam comprised of plates. A gantry girder is one which usually supports moving loads from the top of a gantry, for example, in a workshop. It also refers to a girder supporting road signage on a highway gantry.

Why stiffeners are provided in plate girder?

Detailed Solution. Explanation: The main purpose of Stiffener in a plate girder is to prevent the buckling of web. In which different type of stiffeners are used.

What is the main purpose of a gantry girder?

Gantry girders are used to provide support for cranes because of the various directions loads are exerted on the cranes during the moving process for loads.

Why is a channel section used in compression flange of gantry girder generally?

ADVERTISEMENTS: In the usual case, the gantry girder is laterally unsupported. Hence it is a practice to strengthen the top compression flange by making it wider using channels. Sometimes a walk way connected to the gantry girder is provided in which case the girder may be regarded as laterally supported.

Why plate girder is provided?

Explanation: When the loads and span are large, plate girder sections either with riveted/bolted connections or welded connections may be provided. The number of flange plates can be increased depending upon the moment to be resisted. If depth is limited and loads are too large, welded box plate girder is provided.

Where is plate girder used?

Plate girders are mainly used in railway and road bridges. Mostly the old railway bridges can be highlighted as plate girder bridges. In addition, box girder bridges, beam bridges, military girder composite bridges, and half – through plate girder bridges are considered as it uses.

What is gantry girder?

The gantry girders are girders which supports the loads that are transmitted through the travelling wheels of the crane. Overhead traveling cranes are used in industrial buildings to lift and transport heavy jobs, machines, and so on, from one place to another.

What is the main component of gantry girder?

The web plate. Flange plate (addition of cover plate curtailed at proper sections) Stiffeners like bearing stiffeners, longitudinal stiffeners, and intermediate stiffeners. Splices for flange plate and web plate.

Which section is recommended for gantry girder?

Gantry Girders: These are laterally unsupported beams provided in industrial buildings to carry cranes. It is designed by I-section. It can be designed as a laterally supported or laterally unsupported beam.

What is the additional vertical impact load for electric overhead cranes?

The vertical forces can be increased by 25\% of maximum static wheel load. Explanation: For gantry girders carrying hand operated cranes, the vertical forces are increased by 10\% of maximum static wheel load for impact allowance. The lateral forces can be increased by 5\% of weight of crab and weight lifted on the crane.

What is meant by plate girder?

Definition of plate girder : a built-up girder resembling an I beam in cross section but having a rolled steel plate for a web and flanges that usually consist of angles alone or angles and plates.

What are the flange plates of plate girder used for?

The flange plates of plate girder are provided to resist the bending moment which will be acting on the beam by developing the compressive force in one flange and tensile force in other flange. The extra plate may be provided in case of the very large bending moment.

What is the difference between plate girders and gantry girders?

If the larger span (over 20 m) is to be provided with the plate girders then the plate girders should be combined with the extra cover plates. The gantry girders are girders which supports the loads that are transmitted through the traveling wheels of the crane.

Should a crane girder be provided with a compression flange?

Therefore under normal circumstances, the crane girder should be designed as laterally unsupported beam carrying vertical as well as the horizontal load at the top flange. So, the girder should be provided but having very heavy and wide compression flange is necessary.

What is the difference between I beam and plate girders?

The typical I- beam when made up from different structural steel plates/section instead of single rolled steel cross-section, which is welded or bolted or riveted together so that vertical web and horizontal flanges of the beam, this section is called as plate girders.