The ASCE 7-16 standard provides numerous analytical methods for estimating the seismic forces when designing structures. 2.6 A four-story flat roof hospital building shown in Figure P2.2 has concentrically braced frames as its lateral force resisting system. The intensity of normal pressure, , and the resultant force, P, on the retaining structure is computed as follows: = unit weight of the retained material. The two-story building shown in Figure 2.5 is an elementary school located on a flat terrain in a suburban area, with a wind speed of 102 mph and exposure category B. 2.L is the dimension of the building normal to the wind direction, and B is the dimension parallel to the wind direction. This category applies to buildings with mean roof heights of 30 ft (9.1 m) if the surface extends in the upwind direction for a distance greater than 1,500 ft. For buildings with mean roof heights greater than 30 ft (9.1 m), this category will apply if the surface roughness in the upwind direction is greater than 2,600 ft (792 m) or 20 times the height of the building, whichever is greater. It is an old story, and it is quite simple. This cookie is set by GDPR Cookie Consent plugin. Some of the load combinations for these methods are shown below. Live load due to occupancy or use (classroom) = (40 lb/ft2)(12 ft) = 480 lb/ft, Total uniform load on steel beam = 1142 lb/ft = 1.142 k/ft. Analytical cookies are used to understand how visitors interact with the website. The English were very successful at this. This process, which is referred to as ponding, mostly occurs in flat roofs and roofs with pitches of less than 0.25 in/feet. This is how Britain became a place of diversity, of pluralism, of multiculturalism. Table 2.6. Find out more about how The King's Academy can bring out the best in your child. The value of Ct = 0.028 for structural steel moment resisting frames, 0.016 for reinforced concrete rigid frames, and 0.02 for most other structures (see Table 2.12). SDs = design spectral acceleration. Since the flat roof snow load given for the office building is greater than 30 psf, 20% of the snow load must be included in the seismic dead load computations. Here in Britain, the democratic process allows organisations such as the Police and the Army to be held to account for their conduct.
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