Attachment 6 - Structural Design Criteria.pdf
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- Solicitation number
- 70Z0G126BSSNE0001
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This document is a Design Criteria specification that provides detailed engineering and structural loading parameters for a construction project, conforming to the International Building Code (IBC) 2021 and ASCE 7-16 standards as amended by the Massachusetts State Building Code. The specification outlines comprehensive design requirements including building risk category (IV), roof loads, snow loads, wind loads, and seismic load parameters, with specific technical details such as ground snow load of 30 PSF, ultimate wind speed of 145 MPH, and a seismic design category of C.
Key technical specifications include a dead load of 18 PSF without steel weight, wind exposure category D, an importance factor of 1.2 for snow loads, and seismic force-resisting system classified as steel systems not specifically detailed for seismic resistance with an R-value of 3.0. The design base shears are calculated as 0.090W in both north-south and east-west directions, with the analysis procedure using the Equivalent Lateral Force Method. Site-specific parameters like spectral response coefficients (Ss = 0.168, S1 = 0.049) and site class D are also precisely defined to guide structural engineering design.
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DESIGN CRITERIA:
1. CODES: IBC 2021 AND ASCE 7-16, AS AMENDED BY
MA STATE BUILDING CODE, 10TH ED.
2. BUILDING OR STRUCTURE RISK CATEGORY: IV
3. ROOF LOADS:
DEAD LOAD: 18 PSF W/O STEEL WEIGHT
ROOF TOP UNITS (RTU): SEE PLANS
GROUND SNOW LOAD (Pg): 30 PSF FLAT ROOF SNOW LOAD (Pf): 25 PSF, PLUS DRIFT AS REQUIRED SLOPED ROOF SNOW LOAD (Ps): Cs x Pf EXPOSURE FACTOR (Ce): 1.0 THERMAL FACTOR (Ct): 1.0 IMPORTANCE FACTOR (Is): 1.2
4. WIND LOAD:
ULTIMATE WIND SPEED (Vult): 145 MPH NOMINAL DESIGN WIND SPEED (Vasd): 112 MPH
WIND EXPOSURE: D
INT. PRESSURE COEFFICIENT (GCpi): +/- 0.18
COMPONENTS/CLADDING: ASCE 7-16
5. SEISMIC LOAD:
IMPORTANCE FACTOR (Ie): 1.5
MAPPED SPECTRAL
RESPONSE COEFFICIENTS: Ss = 0.168 AND S1 = 0.049
SITE CLASS: D
SPECTRAL RESPONSE COEFFICIENTS: Sds = 0.179 AND Sd1 = 0.079
SEISMIC DESIGN CATEGORY: C
SEISMIC FORCE-RESISTING SYSTEM: STEEL SYSTEMS NOT SPECIFICALLY
DETAILED FOR SEISMIC RESISTANCE W/ R=3.0
DESIGN BASE SHEARS:
N-S DIRECTION: V = 0.090W
E-W DIRECTION: V = 0.090W
ANALYSIS PROCEDURE: EQUIVALENT LATERAL FORCE METHOD
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