CivE 415-Structural System Design Department of Civil & Environmental EngineeringUniversity of WaterlooPart 2: Structural Loads for Buildings
p. 2.2Part 2: Structural Loads for Buildings Introduction Department of Civil & Environmental EngineeringCivE 415-Structural System Design University of WaterlooI NTRODUCTION •A primary functional requirement of a structure is that it must carry loads.As such, determining the types and magnitude of loading on a structure is a key component of the conceptual design stage, and represents input information for a systematic approach to structural design (see Figure 1). •Accurate estimation of the load types and magnitude is important for structural safety, but also affects the cost of the structure. Overestimation of loads may be conservative, but leads to uneconomical structures. Figure 1 - Systems Design Model for Structures1 •Determining the types of loads to be resisted and the response of the structure to these loads may affect the selection of the structural system.For example: -For structures located in seismically active regions, the requirement to resist large lateral forces while undergoing large lateral deformations dictates the use of ductile moment-resisting frames. -For very tall buildings, lateral load resistance for wind loading may be more efficiently provided by shear walls and tubular systems than by frame action.
Part 2: Structural Loads for Buildingsp. 2.3 Design Codes Department of Civil & Environmental EngineeringCivE 415-Structural System Design University of WaterlooDESIGNC ODES •The structural engineer works with two broad classifications of codes:General building (construction) codes and design codes (standard specifications). •A building code is a legal ordinance enacted by governmental bodies and regulatory agencies, establishing regulations governing building design and construction.Building codes are enacted to protect public health, safety, and welfare. •Canada: -National Building Code of Canada (NBC)2 •NBC is a "Model Code:" adopted for legal use by provincial and municipal building codes •Europe: -Eurocode (developed by CEN) with national annexes adding country-specific requirements. •USA: -International Building Code (IBC) -Uniform Building Code (UBC) -Southern Building Code (SBC) -Building Officials and Code Administrators International, Inc., National Building Code (BOCA) -ASCE Minimum Design Loads for Buildings and Other Structures (ASCE 7) →used by IBC