LoadsOverview

LoadsOverview - CVEN 4545 Steel Design [email protected] OVERVIEW LOADS DESIGN BASIS Load Types Loads exist in several categories Loads are

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CVEN 4545 Steel Design [email protected] OVERVIEW: LOADS. DESIGN BASIS. Load Types Loads exist in several categories. Loads are classed by direction: Vertical (usually gravity) Loads, Horizontal (lateral) Loads Loads are classed by source Dead, Live, Roof Live, Snow, Wind, Rain, Seismic Loads are classed by duration: Permanent Loads, Variable (transient) loads Dead Vertical Permanent Live Vertical Variable Snow Vertical Variable Wind Horizontal and Vertical Variable Rain (ponding) Vertical Variable Seismic Horizontal and Vertical Variable
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(from REF 1) Building Authority Loads are set in applicable building codes. Often, local law names a model building code, and may name modifications to that model code. Example: Boulder, Colorado names the 2003 edition of the International Building Code and provides modifications to IBC. For bridges, loads for design are set by the American Association of State Highway Transportation Officials (AASHTO). Legal loads for interstate trucks are set by the USDOT Federal Highway Administration (FHWA). Legal loads on state and local routes are set by state and local governments, respectively. There are two special categories here:
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Permit loads are special, overweight loads that are reviewed by DOT engineers and given permission to travel on specific routes. Posted bridges are older or weakened bridges that do not meet current design requirements for strength. The lesser load capacity is called the posting or posted load of the bridge. Load Magnitude Loads are based on material weights, on weights and effects of vehicles or other machines and equipment, on meteorological data, and statistical evaluations of human use. Dead loads are computed in detail for each structure based on known materials, members and sizes. Live loads are the loads of humans and chattels. Live loads are the mean maximum lifetime values.
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This note was uploaded on 02/18/2009 for the course CVEN 4545 taught by Professor Hearn during the Spring '08 term at Colorado.

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LoadsOverview - CVEN 4545 Steel Design [email protected] OVERVIEW LOADS DESIGN BASIS Load Types Loads exist in several categories Loads are

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