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Proposed Three-Storey Residential Building (Steel Structure)
Structural Analysis + Design Calculations
PROPOSED THREE-STOREY RESIDENTIAL BUILDING (Steel Structure) Structural Analysis + Design Calculations
LYNDON-ERL C. BEUP Civil Engineer PRC: TIN: PTR: Date: Place:
0137479 500-446-490 655-9370 21 FEB 2019 ILOILO CITY
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Proposed Three-Storey Residential Building (Steel Structure)
Structural Analysis + Design Calculations
STRUCTURAL DESIGN CRITERIA 1.0
CODES & STANDARDS: 1.1
1.2
2.0
GOVERNING CODES: ACI 318-99
Building Code Requirements for Reinforced Concrete, American Concrete Institute
AISC 9th EDITION
Manual of Steel Construction, Allowable Stress Design, American Institute of Steel Construction
AISI 1996 EDITION
Cold Formed Steel Design Manual, American Iron and Steel Institute
ASCE 7-95
Minimum Design Loads for Buildings and Other Structures American Society of Civil Engineers
NSCP 7th EDITION
National Structural Code of the Philippines 2015, Volume 1 UBC 1997 EDITION Uniform Building Code
GOVERNING STANDARDS: ASTM A36
Structural Steel
ASTM A53
Pipe, Steel, Black and Hot-Dipped, Zinc-Coated Welded and Seamless
ASTM A500
Cold-Formed Welded and Seamless Carbon Steel, Structural Tubing in Rounds and Shapes
ASTM A570
Steel, Sheet and Strip, Carbon, Hot-Rolled, Structural Quality
ASTM A611
Steel, Sheet, Carbon, Hot-Rolled, Structural Quality
ASTM A615/PNS 49
Specifications for Steel Bars for Concrete Reinforcement
ASTM C33/PNS 18
Standard Specification for Concrete Aggregates
ASTM C39
Standard Test Method for Compressive Strength of Cylindrical Concrete Specimens
ASTM C94/PNS 46
Standard Specification for Ready-Mixed Concrete
ASTM C150/PNS 07
Standard Specification for Portland Cement
PNS 16
Philippine National Standard for Concrete Hollow Blocks
DESIGN LOADS: 2.1
DEAD LOADS: 2.1.1
ROOF DEAD LOADS (Dr): Suspended Steel Channel System
0.100 KPa
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Proposed Three-Storey Residential Building (Steel Structure)
2.1.2
2.2
Structural Analysis + Design Calculations
Mechanical Duct Allowance
0.200 KPa
Metal Roofing and Purlins
0.100 KPa
FLOOR DEAD LOADS (D): Ceramic or Quarry Tile (20mm) on 13mm Mortar Bed
0.770 KPa
Movable Partition
1.000 KPa
Dry Wall Exterior & Interior Walls
0.677 KPa
LIVE LOADS: 2.2.1
ROOF LIVE LOADS (Lr):
TRIBUTARY AREA (TA) (SQ.M) TA ≤ 118 18.5 ≤ TA ≤ 56 TA > 56 2.2.2
LIVE LOAD (KPa) 0.75 0.70 0.60
FLOOR LIVE LOADS (L): Residential (Basic Floor Area)
2.3
1.900 KPa
WIND LOAD (W): Occupancy Category IV – All structures housing occupancies or having functions not listed in Category I, II or III and Category V. Basic Wind Speed = 260 Kph Exposure C – Open terrain with scattered obstructions having heights generally less than 9m. This category includes flat open country and grasslands. VELOCITY PRESSURE,
𝑞 = 0.613𝐾 𝐾 𝐾 𝑉 (𝑁/𝑚 )
Where: 𝐾
=
Wind directionality factor (see Section 207A.6 of NSCP)
𝐾
=
Velocity pressure exposure coefficient (see Section 207B.3.1)
𝐾
=
Topographic factor defined (see Section 207A.5 of NSCP)
𝑉
=
Basic wind speed (see Section 207A.5 of NSCP)
𝑞
=
Velocity pressure calculated using Equation 207B.3-1 of NSCP at height z
𝑞
=
Velocity pressure calculated using Equation 207B.3-1 at mean roof height h
DESIGN WIND PRESSURE,
𝜌 = 𝑞𝐺𝐶 − 𝑞 𝐺𝐶
(𝑁/𝑚 )
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Proposed Three-Storey Residential Building (Steel Structure)
Structural Analysis + Design Calculations
Where: ρ
=
Design wind pressure for the MWFRS of buildings
𝑞
=
𝑞 for windward walls evaluated at height z above the ground
𝑞
=
𝑞 for leeward walls, side walls, and roof, evaluated at height h
𝑞
=
𝑞 for windward walls, side walls, leeward walls, and roofs of enclosed buildings and for negative internal pressure evaluation in partially enclosed building
𝑞
=
𝑞 for positive internal pressure evaluation in partially enclosed buildings where height z is defined as the level of the highest opening in the building that could affect the positive internal pressure. For buildings sited in windborne debris regions, glazing that is not impact resistant or protected with an impact resistant covering shall be treated as an opening in accordance with Section 207A.10.3 of NSCP For positive internal pressure evaluation, 𝑞 may conservatively be evaluated at height h (𝑞 = 𝑞 )
2.4
𝐺
=
Gust-effect factor (see Section 207A.9 of NSCP)
𝐶
=
External pressure coefficient from Figures 207B.4-1, 207B.402 and 207B.4-3 of NSCP
𝐺𝐶
=
Internal pressure coefficient from Table 207A.11-1 of NSCP
EARTHQUAKE LOAD (E): Seismic Zone 4 Seismic Source Type A Soil Profile Type SD, Stiff Soil Profile (N =15 to 50) Distance from known Seismic Source ≤ 10km EARTHQUAKE LOAD,
𝐸 = 𝜌𝐸 + 𝐸
TOTAL DESIGN BASE SHEAR (USING STATIC FORCE PROCEDURE): 𝑉 = (𝐶 𝐼 𝑊)/𝑅𝑇 TOTAL DESIGN BASE SHEAR NEED NOT EXCEED: 𝑉 = (2.5 𝐶 𝐼 𝑊)/𝑅 TOTAL DESIGN BASE SHEAR SHALL NOT BE LESS THAN: 𝑉 = 0.11𝐶 𝐼 𝑊
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Proposed Three-Storey Residential Building (Steel Structure)
Structural Analysis + Design Calculations
FOR SEISMIC ZONE 4, TOTAL DESIGN BASE SHEAR SHALL NOT BE LESS THAN: 𝑉 = 0.8𝑍𝑁 𝐼 𝑊/𝑅 Where:
3.0
E
=
The earthquake load on an element of the structure resulting from the combination of the horizontal component, E, and the vertical component Ev
Eh
=
The earthquake load due to the base shear, V
Ev
=
The load effect resulting from the vertical component of the earthquake ground motion and is qual to an addition of 0.5CaID to the dead load effect, D, for strength design, and may be taken as zero for allowable stress design
ρ
=
Reliability / redundancy factor = 1.0
V
=
Total design base shear
R
=
8.5 for Special Reinforced Concrete Moment Frames
=
8.0 for Special Moment-Resisting Frames (SMRF), Steel
W
=
Total seismic dead load
I
=
Importance factor = 1.0 (for standard occupancy structure)
T
=
Ct (hn)3/4 = Elastic fundamental period of vibration, in seconds
Ct
=
0.0731 (for reinforced concrete moment-resisting frames)
=
0.0853 (for steel moment-resisting frames)
hn
=
Height of structure, in meters
Z
=
Seismic zone factor = 0.4
Cv
=
Seismic coefficient = 0.64Nv
Ca
=
Seismic coefficient = 0.44Na
Nv
=
Near source factor = 1.0
Na
=
Near source factor = 1.2
DESIGN MATERIAL STRESSES 3.1
CONCRETE ULTIMATE COMPRESSIVE STRENGTH @ 28 DAYS, fc’ (3,000psi)
21.0 MPa
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Proposed Three-Storey Residential Building (Steel Structure)
Structural Analysis + Design Calculations
3.2
PRIMARY REINFORCING STEEL YIELD STRENGTH, fy (40,000psi)
275 MPa
3.3
SECONDARY REINFORCING STEEL YIELD STRENGTH, fysec (40,000psi)
275 MPa
3.4
STRUCTURAL STEEL YIELD STRENGTH, Fy (36,000psi)
250 MPa
3.5
STEEL PIPE YIELD STRENGTH, Fy (35,000psi)
241 MPa
3.6
STRUCTURAL TUBING YIELD STRENGTH, Fy (39,000psi)
269 MPa
3.7
COLD-FORMED STEEL YIELD STRENGTH, Fy (33,000psi)
230 MPa
3.8
MASONRY ULTIMATE COMPRESSIVE STRENGTH @ 28 DAYS, fm’ (700psi)
3.8 MPa
3.9
MASONRY CONCRETE GROUT COMPRESSIVE STRENGTH @ 28 DAYS, fc’ 13.8 MPa (2,000psi)
3.10
LEAN CONCRETE ULTIMATE COMPRESSIVE STRENGTH @ 28 DAYS, fc’ 6.9 MPa (1,000psi)
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