Asce 7 10 Chapter 30 Pdf
The following definitions apply to the provisions of Chapters through: APPROVED: Acceptable to the authority having jurisdiction. BASIC WIND SPEED, V: Three-second gust speed at 33 ft (10 m) above the ground in Exposure C (see Section 26.7.3) as determined in accordance with. BUILDING, ENCLOSED: A building that does not comply with the requirements for open or partially enclosed buildings. BUILDING ENVELOPE: Cladding, roofing, exterior walls, glazing, door assemblies, window assemblies, skylight assemblies, and other components enclosing the building. BUILDING AND OTHER STRUCTURE, FLEXIBLE: Slender buildings and other structures that have a fundamental natural frequency less than 1 Hz. Orcad pspice 9.1 full version free download. BUILDING, LOW-RISE: Enclosed or partially enclosed buildings that comply with the following conditions:.
Request PDF on ResearchGate ASCE 7-10 wind loads ASCE 7-10 'Minimum Design Loads for Buildings and Other Structures' contains several changes regarding wind loads. The major editorial change. Asce 7 10 presentation on seismic bracing for mep systems. SEISMIC DESIGN REQUIREMENTS FOR NONSTRUCTURAL COMPONENTS CHAPTER 13 8. SUPPORTS Wind forces shall be designed per section 29.5 Wind provisions for components and cladding is now in chapter 30 Wind provisions on equipment is part 6 Compare section 13.3 vs WIND SECTION 29.5 35. CHAPTER 26 WIND LOADS: GENERAL REQUIREMENTS 242 or 1 percent of the area of that wall, whichever is smaller, and the percentage of openings in the balance of the building envelope does not exceed 20 percent. These conditions are expressed by the following equations: 1. A o 1.10A oi 2. A o 4 ft2 (0.37 m2) or 0.01A g, whichever is smaller.
Mean roof height h less than or equal to 60 ft (18 m) and. Mean roof height h does not exceed least horizontal dimension. BUILDING, OPEN: A building having each wall at least 80% open. In areas outside hurricane-prone regions, regional climatic data shall only be used in lieu of the basic wind speeds given in Fig. 26.5-1 when (1) approved extreme-value statistical-analysis procedures have been employed in reducing the data; and (2) the length of record, sampling error, averaging time, anemometer height, data quality, and terrain exposure of the anemometer have been taken into account. Reduction in basic wind speed below that of Fig.
26.5-1 shall be permitted. In hurricane-prone regions, wind speeds derived from simulation techniques shall only be used in lieu of the basic wind speeds given in Fig. 26.5-1 when approved simulation and extreme value statistical analysis procedures are used. The use of regional wind speed data obtained from anemometers is not permitted to define the hurricane wind-speed risk along the Gulf and Atlantic coasts, the Caribbean, or Hawaii. In areas outside hurricane-prone regions, when the basic wind speed is estimated from regional climatic data, the basic wind speed shall not be less than the wind speed associated with the specified mean recurrence interval, and the estimate shall be adjusted for equivalence to a 3-sec gust wind speed at 33 ft (10 m) above ground in Exposure C.
The data analysis shall be performed in accordance with this chapter. FIGURE 26.5-1A Basic Wind Speeds for Risk Category II Buildings and Other Structures Notes:. Values are design 3-second gust wind speeds in miles per hour (m/s) at 33 ft (10m) above ground for Exposure C category. Linear interpolation between contours is permitted. Islands and coastal areas outside the last contour shall use the last wind speed contour of the coastal area. Mountainous terrain, gorges, ocean promontories, and special wind regions shall be examined for unusual wind conditions.
Wind speeds correspond to approximately a 7% probability of exceedance in 50 years (annual exceedance probability = 0.00143, MRI = 700 years). FIGURE 26.5-1A ( Continued) FIGURE 26.5-1B Basic Wind Speeds for Risk Category III and IV Buildings and Other Structures Notes:. Values are design 3-second gust wind speeds in miles per hour (m/s) at 33 ft (10m) above ground for Exposure C category. Linear interpolation between contours is permitted. Islands and coastal areas outside the last contour shall use the last wind speed contour of the coastal area. Mountainous terrain, gorges, ocean promontories, and special wind regions shall be examined for unusual wind conditions. Wind speeds correspond to approximately a 3% probability of exceedance in 50 years (annual exceedance probability = 0.000588, MRI = 1700 years).
FIGURE 26.5-1B ( Continued) FIGURE 26.5-1C Basic Wind Speeds for Risk Category I Buildings and Other Structures Notes:. Values are design 3-second gust wind speeds in miles per hour (m/s) at 33 ft (10m) above ground for Exposure C category.
Linear interpolation between contours is permitted. Islands and coastal areas outside the last contour shall use the last wind speed contour of the coastal area. Mountainous terrain, gorges, ocean promontories, and special wind regions shall be examined for unusual wind conditions. Wind speeds correspond to approximately a 15% probability of exceedance in 50 years (annual exceedance probability = 0.00333, MRI = 300 years). FIGURE 26.5-1C ( Continued) Wind Directionality Factor, K d Table 26.6-1 Structure Type Directionality Factor K d. Buildings Main Wind Force Resisting System Components and Cladding 0.85 0.85 Arched Roofs 0.85 Chimneys, Tanks, and Similar Structures Square Hexagonal Round 0.90 0.95 0.95 Solid Freestanding Walls and Solid Freestanding and Attached Signs 0.85 Open Signs and Lattice Framework 0.85 Trussed Towers Triangular, square, rectangular All other cross sections 0.85 0.95.Directionality Factor K d has been calibrated with combinations of loads specified in.
This factor shall only be applied when used in conjunction with load combinations specified in Sections and. Exposure B: For buildings with a mean roof height of less than or equal to 30 ft (9.1 m), Exposure B shall apply where the ground surface roughness, as defined by Surface Roughness B, prevails in the upwind direction for a distance greater than 1,500 ft (457 m). For buildings with a mean roof height greater than 30 ft (9.1 m), Exposure B shall apply where Surface Roughness B prevails in the upwind direction for a distance greater than 2,600 ft (792 m) or 20 times the height of the building, whichever is greater. Exposure C: Exposure C shall apply for all cases where Exposures B or D do not apply.
Asce 7 10 Chapter 30 Pdf Free
Exposure D: Exposure D shall apply where the ground surface roughness, as defined by Surface Roughness D, prevails in the upwind direction for a distance greater than 5,000 ft (1,524 m) or 20 times the building height, whichever is greater. Exposure D shall also apply where the ground surface roughness immediately upwind of the site is B or C, and the site is within a distance of 600 ft (183 m) or 20 times the building height, whichever is greater, from an Exposure D condition as defined in the previous sentence. For a site located in the transition zone between exposure categories, the category resulting in the largest wind forces shall be used. EXCEPTION: An intermediate exposure between the preceding categories is permitted in a transition zone provided that it is determined by a rational analysis method defined in the recognized literature.
Wind speed-up effects at isolated hills, ridges, and escarpments constituting abrupt changes in the general topography, located in any exposure category, shall be included in the determination of the wind loads when buildings and other site conditions and locations of structures meet all of the following conditions:. The hill, ridge, or escarpment is isolated and unobstructed upwind by other similar topographic features of comparable height for 100 times the height of the topographic feature (100 H) or 2 mi (3.22 km), whichever is less.
This distance shall be measured horizontally from the point at which the height H of the hill, ridge, or escarpment is determined. The hill, ridge, or escarpment protrudes above the height of upwind terrain features within a 2-mi (3.22-km) radius in any quadrant by a factor of two or more. The structure is located as shown in Fig. 26.8-1 in the upper one-half of a hill or ridge or near the crest of an escarpment.
H/L h ≥ 0.2. H is greater than or equal to 15 ft ( m) for Exposure C and D and 60 ft (18 m) for Exposure B.
Topographic Factor, K zt Figure 26.8-1 Topographic Multipliers for Exposure C H/L h K 1 Multiplier x/L h K 2 Multiplier z/L h K 3 Multiplier 2-D Ridge 2-D Escarp. Hill 2-D Escarp. All Other Cases 2-D Ridge 2-D Escarp.
Asce 7 10 Chapter 13
Hill 0.20 0.29 0.17 0.21 0.00 1.00 1.00 0.00 1.00 1.00 1.00 0.25 0.36 0.21 0.26 0.50 0.88 0.67 0.10 0.74 0.78 0.67 0.30 0.43 0.26 0.32 1.00 0.75 0.33 0.20 0.55 0.61 0.45 0.35 0.51 0.30 0.37 1.50 0.63 0.00 0.30 0.41 0.47 0.30 0.40 0.58 0.34 0.42 2.00 0.50 0.00 0.40 0.30 0.37 0.20 0.45 0.65 0.38 0.47 2.50 0.38 0.00 0.50 0.22 0.29 0.14 0.50 0.72 0.43 0.53 3.00 0.25 0.00 0.60 0.17 0.22 0.09 3.50 0.13 0.00 0.70 0.12 0.17 0.06 4.00 0.00 0.00 0.80 0.09 0.14 0.04 0.90 0.07 0.11 0.03 1.00 0.05 0.08 0.02 1.50 0.01 0.02 0.00 2.00 0.00 0.00 0.00. Notes:. For values of H/L h, x/L h and z/L h other than those shown, linear interpolation is permitted. For H/L h 0.5, assume H/L h = 0.5 for evaluating K 1 and substitute 2H for L h for evaluating K 2 and K 3. Multipliers are based on the assumption that wind approaches the hill or escarpment along the direction of maximum slope. Notation: H: Height of hill or escarpment relative to the upwind terrain, in feet (meters). L h: Distance upwind of crest to where the difference in ground elevation is half the height of hill or escarpment, in feet (meters).
K 1: Factor to account for shape of topographic feature and maximum speed-up effect. K 2: Factor to account for reduction in speed-up with distance upwind or downwind of crest.
K 3: Factor to account for reduction in speed-up with height above local terrain. X: Distance (upwind or downwind) from the crest to the building site, in feet (meters). Z: Height above ground surface at building site, in feet (meters). Μ: Horizontal attenuation factor. Γ: Height attenuation factor.
Topographic Factor, K zt Figure 26.8-1 (cont'd). As an alternative to performing an analysis to determine n 1, the approximate building natural frequency, n a, shall be permitted to be calculated in accordance with for structural steel, concrete, or masonry buildings meeting the following requirements:. The building height is less than or equal to 300 ft (91 m), and. The building height is less than 4 times its effective length, L eff The effective length, L eff, in the direction under consideration shall be determined from the following equation. Glazed openings shall be protected in accordance with. In the following locations:.
Within 1 mi of the coastal mean high water line where the basic wind speed is equal to or greater than 130 mi/h (58 m/s), or. In areas where the basic wind speed is equal to or greater than 140 mi/h (63 m/s). For Risk Category II buildings and other structures and Risk Category III buildings and other structures, except health care facilities, the wind-borne debris region shall be based on Fig.
For Risk Category III health care facilities and Risk Category IV buildings and other structures, the wind-borne debris region shall be based on Fig. Risk categories shall be determined in accordance with. Glazing in buildings requiring protection shall be protected with an impact-protective system or shall be impact-resistant glazing. Impact-protective systems and impact-resistant glazing shall be subjected to missile test and cyclic pressure differential tests in accordance with ASTM E1996 as applicable. Testing to demonstrate compliance with ASTM E1996 shall be in accordance with ASTM E1886. Impact-resistant glazing and impact-protective systems shall comply with the pass/fail criteria of Section 7 of ASTM E1996 based on the missile required by Table 3 or Table 4 of ASTM E1996.
EXCEPTION: Other testing methods and/or performance criteria are permitted to be used when approved. Glazing and impact-protective systems in buildings and other structures classified as Risk Category IV in accordance with shall comply with the 'enhanced protection' requirements of Table 3 of ASTM E1996. Glazing and impact-protective systems in all other structures shall comply with the 'basic protection' requirements of Table 3 of ASTM E1996.
User Note: The wind zones that are specified in ASTM El996 for use in determining the applicable missile size for the impact test have to be adjusted for use with the wind speed maps of ASCE 7-10 and the corresponding wind borne debris regions, see Section C26.10.3.2.
This chapter applies to the determination of wind loads on building appurtenances (such as rooftop structures and rooftop equipment) and other structures of all heights (such as solid freestanding walls and freestanding solid signs, chimneys, tanks, open signs, lattice frameworks, and trussed towers) using the directional procedure. The steps required for the determination of wind loads on building appurtenances and other structures are shown in Table 29.1-1. User Note: Use to determine wind pressures on the MWFRS of solid freestanding walls, freestanding solid signs, chimneys, tanks, open signs, lattice frameworks, and trussed towers.
Wind loads on rooftop structures and equipment may be determined from the provisions of this chapter.The wind pressures are calculated using specific equations based upon the directional procedure. The design wind pressure on a solid sign attached to the wall of a building, where the plane of the sign is parallel to and in contact with the plane of the wall, and the sign does not extend beyond the side or top edges of the wall, shall be determined using procedures for wind pressures on walls in accordance with, and setting the internal pressure coefficient (GC pi) equal to 0. This procedure shall also be applicable to solid signs attached to but not in direct contact with the wall, provided the gap between the sign and wall is no more than 3 ft (0.9 m) and the edge of the sign is at least 3 ft (0.9 m) in from free edges of the wall, i.e., side and top edges and bottom edges of elevated walls.
F h = q h(GC r)A f (lb) (N) (29.5-2) where (GC r) = 1.9 for rooftop structures and equipment with A f less than (0.1 Bh). (GC r) may be reduced linearly from 1.9 to 1.0 as the value of A f is increased from (0.1 B h) to (Bh) q h = velocity pressure evaluated at mean roof height of the building A f = vertical projected area of the rooftop structure or equipment on a plane normal to the direction of wind, in ft 2 (m 2) The vertical uplift force, F v, on rooftop structures and equipment shall be determined from Eq.