Slide 101 Ex 12 Live Load Distribution Live load acting on column b i h i are

Slide 101 ex 12 live load distribution live load

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Slide # 101 Ex. 1.2 Live Load Distribution Live load acting on column bi& hiare = 0.55 x 50 psf x 625 = 17.18K Live load acting on column ei= 0.46 x 50 psf x 1250 = 28.75 K Live load acting on column e6= 0.5 x 50 psf x 1250 = 31.25 kips CE 405 - Ch. 1 Slide # 102 Note that the live loads calculated in Steps I, II, & III are consistent & to be used for design. The concentrated live load calculated in Step IV are just to check that the loads calculated in Steps I, II, & III are more than the loads calculated in Step IV, which they are. Ex. 1.2 Live Load Distribution
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52 CE 405 - Ch. 1 Slide # 103 Ex. 1.3 - Snow Load The unheated storage facility shown in Fig. is located on flat open terrain near Chicago Illinois. Determine the snow load on the roof. CE 405 - Ch. 1 Slide # 104 Ex. 1.3 - Snow Load Pf = 0.7 CeCtI Pg Ce= 0.8 (fully exposed roof in unobstructed area) Ct= 1.2 (Unheated building kept below freezing) I = 0.8 (storage facility) Pg= 25 lb/ft2(Figure 7.1 pg 84,85 in ASCE 7-05) Pf = 0.7(0.8) (1.2) (0.8) (25) = 16.8 Lb/ft2
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53 CE 405 - Ch. 1 Slide # 105 Public Policy: Building Codes and Specifications Structural members in buildings are to be designed according to one of the following codes (in Lansing, Mi) International Building Code (IBC 2007) Michigan Building Code (MBC 2003) The loads on acting on structural members are to evaluated using ASCE Minimum design loads (ASCE 2005) Design specifications are provided in the standards such as: Hot Rolled Steel (AISC Manual 2005) Cold Formed Steel (AISI , 1996) AASHTO 2000 (Highways) AREMA 2000 (Railways) Concrete structures (ACI 318, 2006) Codes and standards are developed through consensus process. PEO: Understand basic concepts of public policy as it relates to structural design (e.g., development and use of codes and standards) CE 405 - Ch. 1 Slide # 106 Public Policy: Building Codes and Specifications Design of most structures is controlled by building codesand design specifications. Specificationsare developed by professional organizations and are not legally enforceable unless they are adopted into the building codes. Some specifications: AISC LRFD Design Specification for Structural Steel Buildings; ASCE Minimum Design Loads for Buildings and other Structures(ASCE 7); ACI 318 Building Codes Requirements for Reinforced Concrete AHJ (municipal and state governments) can adopt, in whole or in part, different building codesand specificationsStructural steel design in the U.S. is based on the specifications of the American Institute of Steel Construction (AISC) Building codesand specificationsare sometimes used interchangeably. Building codesare legal document and cover all facets of building (structural design, architectural details, fire protection). Specificationsare recommended guidance specific to a certain aspects of structural design PEO: Understand basic concepts of public policy as it relates to structural design (e.g., development and use of codes and standards)
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54 CE 405 - Ch. 1 Slide # 107 Background of Structural Steel Economical production in large volume not available until mid 19thcentury and the introduction of the Bessemer process.
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