Floor Diaphragm Action Pdf

Full scale testing of 200mm deep floor slabs has shown that the shear transfer capacity between units depends on the development of shear friction by aggregate interlock and on dowel action of the reinforcement in in situ concrete end beams.

Floor diaphragm action pdf. Core aggregating the world s open access research papers. Interface shear stresses are in excess of working load by a factor of at least 2 15. Diaphragm is determined to be more than two times the average deflection of the vertical resistant elements the diaphragms may be considered as being flexible. The elements marked with numbers corresponding to the behavior of the diaphragm in action due to the application of the lateral loads.

A horizontal system roof floor or other membrane or horizontal bracing acting to. After a particular structure has been strengthened one of the concerns is providing an adequate connection between the frp and adjacent foundation or floor diaphragm the connection is critical in establishing membrane action for structures. 2 6 floor diaphragm action 27 2 7 steelwork connection design 29 2 8 fire safety 32 2 9 dynamics 35 2 10 durability of car park structures 36 3 initial sizing 37 3 1 typical floor loadings 37 3 2 initial sizing tables for precast units 37 3 3 beam sizes 39 4 detailing 41 4 1 introduction 41 4 2 structural integrity 41. The diaphragm forces tend to be transferred to the vertical resisting elements.

The strengthening solution consisted of an orthogonal grid of frp strips designed to sustain the tension loads in the diaphragm as illustrated in figure 1. Action results in a redistribution of shear to the. Cyclic loading causes a degradation in shear stiffness ks and an. The connection between the hollowcore floor system and the perimeter bond beam was also therefore deficient.

In the meantime new zealand engineers are designing various strengthening schemes to improve the floor diaphragm action with the use of frp being often preferred over other methods. The transverse applied lateral load is carried to the roof and foundation by the wall which is assumed here to be a vertically spanning element. In structural engineering a diaphragm is a structural element that transmits lateral loads to the vertical resisting elements of a structure such as shear walls or frames diaphragms are typically horizontal but can be sloped such as in a gable roof on a wood structure or concrete ramp in a parking garage. 12 5 fiber reinforced polymer frp connection systems.

Urgessa in blast protection of civil infrastructures and vehicles using composites 2010.