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Camilleri D.H.,DhiPERITI | Cassar I.C.,DhiPERITI
Structural Engineer | Year: 2014

Denis H. Camilleri shared his views on the effect of material properties on deflection, rotation and vibration n the preliminary structural design stage. A preliminary sizing calculation for the composite floor slab is undertaken according to EC4 standard. The rectangular stress blocks for the concrete slab and the steel section obtained by multiplying the ultimate limit state (ULS) with the resultant lever arm, enabled simple calculation of the resisting moment. This hand calculation included preliminary deflection and vibration checks. The deflection of a vertical cantilever, as subjected to wind loading, created a side sway deflection. The required panel thickness is dictated by this side sway deflection, together with the slenderness effects of the wall panels, which were exacerbated by the eccentricity of the floor slabs resulting from the fact that the slabs sit on the wall panels.


Camilleri D.H.,dhiPERITI | Camilleri Cassar I.,dhiPERITI
Structural Engineer | Year: 2014

Experts share their views on the structural properties of materials in terms of their strength and their serviceability in use. The magnitude of the serviceability characteristics, as defined by deflection and the ensuing rotation at the supports, which leads to cracking and the problematic effect of vibration, are examined via hand calculations that give an 'engineering feel' to the reader. Two design examples are described, which will demonstrate these hand calculations when undertaken in structural steel, timber, composite steel and masonry paneled construction. A serviceability shortfall can be gauged from a simple, shading timber structure. The examples that follow note the hand calculations to be undertaken via five basic equations aided by a BCSA chart. The methods outlined for the calculation of deflections are based on the method outlined by the BCSA in producing deflection coefficients C for steel members.


Camilleri D.H.,DHIPERITI | Cassar I.C.,DHIPERITI
Structural Engineer | Year: 2014

Experts discuss the effect of material properties used in construction of structures on deflection, rotation, and vibration. The proposed intermediate floor has an effective span of 7.5m between load-bearing masonry walls, with an overall depth of 6.25m and a storey height of 2.75m. The structural materials adopted will ensure that the construction does not disrupt the existing use of the premises. It is also important to note that the behavior of timber is not ductile and timber design is different to steel and concrete design. Respecting the vibration criteria will create a stiffer grillage and this increases the slope of the steel joist at its end, as the steel joist is supported on the main steel girder.

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