# Tính tóan động đất 15

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## Tính tóan động đất 15

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## Nội dung Text: Tính tóan động đất 15

1. Definitions Definitions A Boundary component (boundary member): A member at the perimeter (edge or opening) of a shear Acceleration-sensitive nonstructural compo- wall or horizontal diaphragm that provides tensile and/or nent: A nonstructural component that is sensitive to, compressive strength. and subject to, damage from inertial loading. Braced frame: A vertical lateral-force-resisting ele- Acceptance criteria: Limiting values of properties ment consisting of vertical, horizontal, and diagonal such as drift, strength demand, and inelastic deformation components joined by concentric or eccentric connec- used to determine the acceptability of a component at a tions. given performance level. BSE-1: Basic Safety Earthquake-1, taken as the lesser Action: An internal moment, shear, torque, axial load, of the ground shaking for a 10%/50 year earthquake or deformation, displacement, or rotation corresponding to two-thirds of the BSE-2 at a site. a displacement due to a structural degree of freedom; BSE-2: Basic Safety Earthquake-2, taken as the ground designated as force- or deformation-controlled. shaking based on the MCE at a site. Active Fault: A fault for which there is an average his- BSO: Basic Safety Objective is a Rehabilitation Objec- toric slip rate of 1 mm per year or more, and evidence of tive that achieves the dual rehabilitation goals of the Life seismic activity within Holocene times (past 11,000 Safety Building Performance Level for the BSE-1 Earth- years). quake Hazard Level and the Collapse Prevention Build- Adjusted Resistance: The reference resistance ing Performance Level for the BSE-2 Earthquake adjusted to include the effects of applicable adjustment Hazard Level. factors resulting from end use and other modifying fac- Building Occupancy: The purpose for which a build- tors excluding time-effect adjustments, which are con- ing, or part thereof, is used, or intended to be used, des- sidered separately and not included. ignated in accordance with the applicable building code. Aspect ratio: Ratio of height to width for shear walls Building Performance Level: A limiting damage and span to width for horizontal diaphragms. state for a building, considering structural and nonstruc- Assembly: Two or more interconnected components. tural components, used in the definition of Rehabilita- tion Objectives. B C Balloon framing: Continuous stud framing from sill to roof, with intervening floor joists nailed to studs and Cast Iron: A hard, brittle nonmalleable iron-carbon supported by a let-in ribbon. alloy containing 2.0 to 4.5 percent carbon. Shapes are obtained by reducing iron ore in a blast furnace, forming Base: The level at which earthquake effects are it into bars (or pigs), and remelting and casting it into its imparted to the building. final form. Beam: A structural member whose primary function is Cavity wall: A masonry wall with an air space between to carry loads transverse to its longitudinal axis. wythes. Bearing wall: A wall that supports gravity loads of at Chord: See diaphragm chord. least 200 pounds per lineal foot from floors and/or roofs. Clay tile masonry: Masonry constructed with hollow Bed joint: The horizontal layer of mortar on which a units made of clay tile. masonry unit is laid. FEMA 356 Seismic Rehabilitation Prestandard Definitions-1