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Unformatted text preview: University of California at Berkeley Spring Semester 2009 Department of Civil Engineering Instructor: Khalid M. Mosalam CEE123 -- Design of Reinforced Concrete Structures Laboratory Assignment 2 (Due at beginning of next Laboratory Session) In this problem you will perform some preliminary calculations needed to begin the design of a small 5-story office building. The building is roughly 60 by 80 feet in plan. Initially, bay spacings have been selected to be 20 feet in each direction, refer to Figure 1. A joist floor system has also been selected. In this system a thin slab transfers load to closely spaced beams (joists) which in turn transfer load to girders and then to columns. This system is light because of the thin slab between the joints, but is relatively expensive because it requires considerable formwork (typically reusable metal forms). In this problem, we need to estimate the ultimate dead and live loads carried by the slab, joists, girders and columns. Dead Loads Dead loads consist of the self weight of the reinforced concrete slab, plus any permanent loads attached to the structure. In this case, we can consider the following loads to be uniformly distributed over the entire floor area: Load Source Load (psf) Floor finishes 6 Ceiling finishes 11 Fire sprinkler system 6 Heating, ventilation and air conditioning (HVAC) equipment 12 In addition, partition loads need to be considered. Where partition locations are not know or may change, building codes, like the Uniform Building Code (UBC), generally require that a uniformly distributed load of 20 psf be considered. Where partitions are of a permanent nature, like the fire walls required around stair shafts or the exterior cladding...
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- Spring '09
- Civil Engineering