DESIGN PRINCIPLES OF TRUSSED BEAMS

DESIGN PRINCIPLES OF TRUSSED BEAMS A beam which is stiffened by a system of braces constituting atruss of which the beam is a chord is called as Trussed Beam. Trussed beams are used for mainly for the Industrial buildings where free space requirement are essential for more working areas. The span of truss varies from 10’-0” to 300’-0” depending on the type of requirement and the available spaces. A truss is a beam which is bent to the shape of the bending moment diagram in opposite direction. The shape shown is better to take care of the Bending moment. H= rise of the truss which is 1/8 for AC sheet. As suggested earlier the top main chord (rafter) is divided into main divisions which in turn subdivided to suite the roof covering sheets. Nowadays...

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Precast Method of Bridge Construction

Precast Method of Bridge Construction (i) Precast Beams: Precast beam decks are generally used for short span bridges ranging between 5m to 50m – these may be railway or motorway bridges. Standard inverted tee beams or M-beams are chosen and positioned by crane. Where precast beams are considered for a motorway bridge construction, the bridge cross-section for a typical carriageway will generally consist of four beams. Erection time of such bridge should have a rate of construction of four beams per day. A cast-in-situ slab top deck is normally used with an expected rate of construction of one span a week. (ii) Precast Decks: Precast deck construction is often used for the construction of long viaducts. It is a time saving method which is...

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AIRCRAFT CONSTRUCTION

The airframe of a fixed-wing aircraft consists of the following five major units: FuselageWingsStabilizersFlight controls surfacesLanding gearA rotary-wing aircraft consists of the following four major units: FuselageLanding gearMain rotor assemblyTail rotor assemblyThe primary factors to consider in aircraft structures are strength, weight, and reliability. These factors determine the requirements to be met by any material used to construct or repair the aircraft. Airframes must be strong and light in weight. An aircraft built so heavy that it couldn’t support more than a few hundred pounds of additional weight would be useless. All materials used to construct an aircraft must be reliable. Reliability minimizes the possibility of...

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Posted in: AIRCRAFT CONSTRUCTION,design,Projects,Top 10