1. Which of the following should be considered in the preliminary design? Lateral load-resisting systems. Framing plans. Preliminary member sizes, including ﬂoor thicknesses. These may be based on span-to depth ratios, the charts in this Guide or a preliminary structural design carried out to conﬁrm proposed sizes. Control of volume change deformations and restraint forces. Connection concepts. None of the above All of the above 2. Which of the following should be considered to confirm if the project is economically viable? Architectural appearance. The standard of quality and the broad requirements for the structure. How the structure will perform and how it is to be built. Preliminary cost estimate. All of the above 3. The thickness of the ﬂoor zone ________than the overall depth of the ﬂoor system. It includes the depth required for any ﬂoor ﬁnishes, set downs or set ups, falls, and the depth required to accommodate below ﬂoor building services. is not grater is greater 4. Figure 1 is: Piping installation. AC duct work. Typical floor zone. 5. In modern buildings the floor zone may often include: air conditioning ductwork and fan coil units ventilation and exhaust ducts sanitary ﬂoor traps and waste pipes stormwater waste pipes, hot and cold water ﬁre water and sprinklers smoke detectors data and electrical cabling lighting and many other specialist services All of the above 6.
Services need to move horizontally along and across the ﬂoor and vertically from ﬂoor to ﬂoor in a building without clashing. The architect, structural designer and the services designer __________ liaise closely to ensure that services such as ducts, cables and the penetrations for the services do not jeopardize the structural behavior of the ﬂoor system or the operation of the building.
should should not 7. Designers should appreciate that deﬂection _________ as important as strength in the structural design of concrete ﬂoors, particularly in the design of shallow reinforced concrete ﬂoors systems. Special attention should be given to the proportioning of the ﬂoor system for deﬂection before the ﬁnal design. is just is not 8. Cantilevers are often used for balconies and along the external edge of a building to balance the internal span and/or improve the shear capacity at edge and corner columns Figure 5. Regardless of the ﬂoor system chosen they always need careful consideration. Cantilevers are usually limited to a span of about _______ of the back span and should be supported by a stiff support such as a beam or column. 25 to 35% 40 to 60% 9. Traditionally, concrete ﬂoor systems are reinforced using bars, fabric or using high-strength strand which is stressed. The action of prestressing with a straight or a draped cable in concrete enables the applied loads to be balanced by the uplift force so that practically no deﬂection results. This is a signiﬁcant beneﬁt in long-span ﬂoors as it eliminates the need to camber formwork or to provide deeper reinforced concrete sections. True False 10. Figure 10 Shows: A reinforced concrete floor. Flat plate floor system. Beam and slab system. 11. Which one of the following are advantages of beam and slab? Traditional effective solution. Long spans. Both of the above 12. Which one of the followings are disadvantages of beam and slab? Penetrations through beams for large ducts difﬁcult to handle Depth of ﬂoor Greater ﬂoor-to-ﬂoor height. All of the above 13. Which one of the followings would be considered as advantages of Band Beam and Slab? Relatively simple formwork Shallow beams to allow services to run under the ﬂoor Minimum structural depth and reduced ﬂoor-to-ﬂoor height Long spans Good cost/time solution Allows the use of ﬂying forms. All of the above 14. Which one of the following would be disadvantages of band beam and slab? Long-term deﬂection may be controlling factor and post-tensioning may be required May need service penetrations through beams which are difﬁcult to handle. Both of the above 15. In which of the following conditions would solid slabs be chosen? The loading results in high shear or there are heavy point loads. The environment is aggressive, for example in splash zones or where condensation may occur over water. High cover or special concrete is required. Projecting reinforcement requires the units to be wet-cast, for example when used as a sofﬁt beam to support hollowcore. All of the above.