Lecture 4 Preliminary Structural Design

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Concordia University *

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Oct 30, 2023

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BLDG / CIVI 390 Building / Civil Engineering Design Project Lecture 4 BLDG / CIVI 390 Building / Civil Engineering Design Project Lecture 4 – Preliminary Structural Design
BLDG / CIVI 390 Building / Civil Engineering Design Project Lecture 4 1 / 48 Conceptual Design The first step in the project …Conceptual Design (Group Submission ) 1. A brief intro of your project – 1 paragraph 2. List of the group members – Names and ID 3. Work breakdown structure (i.e., identify the main tasks in your project, tentative time line to accomplish them and lead person for each task) 4. Sketches of the plan views for the conceptual design and two elevation views of the final design 5. Analysis of alternatives: analysis of alternate designs and why the final one is chosen.
BLDG / CIVI 390 Building / Civil Engineering Design Project Lecture 4 2 / 48 Sample tasks list 1. Project Management 2. Conceptual design 3. Preliminary Architectural details 4. Preliminary Structural Design 5. Detailed Structural Design 6. Building Envelope Design (Bldg groups) 7. Building Energy Analysis (Bldg groups) 8. Shear Wall Design (Civil Groups) 9. ETABS modeling of high rise concrete building (Civil Groups) 10. Project cost estimation
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BLDG / CIVI 390 Building / Civil Engineering Design Project Lecture 4 3 / 48 Structural Design • A structure must be designed to resist all the loads expected to act on the structure during its service life. • Structural design usually involves design in: – structural frame and – structural components
BLDG / CIVI 390 Building / Civil Engineering Design Project Lecture 4 4 / 48 Input to the Design Process • A structural design process starts with the following information. – building layout (horizontal and vertical) – service functions of each unit in the building – structural design code
BLDG / CIVI 390 Building / Civil Engineering Design Project Lecture 4 5 / 48 Output to the Design Process • Structural form: – Structural form refers to the overall shape of a structure and the arrangement and function of the elements comprising it. – There are many structural materials and many ways that structural elements can be arranged.
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BLDG / CIVI 390 Building / Civil Engineering Design Project Lecture 4 6 / 48 Structural Form: Considerations
BLDG / CIVI 390 Building / Civil Engineering Design Project Lecture 4 7 / 48 Structural Form: Considerations • for what? • what could be the implication on design?
BLDG / CIVI 390 Building / Civil Engineering Design Project Lecture 4 8 / 48 Structural Form: Considerations • material choices?
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BLDG / CIVI 390 Building / Civil Engineering Design Project Lecture 4 9 / 48 Load Types • Dead Load • Live Load • Snow, Rain, Wind and Earthquake
BLDG / CIVI 390 Building / Civil Engineering Design Project Lecture 4 10 / 48 Load Types • Dead Load • Live Load • Snow, Rain, Wind and Earthquake are you sure when, what, and how they happen? Citicorp Center, a famous case of structural design, not just because of its complexity and novelty, but also about the whole process of design, construction, and remedy.
BLDG / CIVI 390 Building / Civil Engineering Design Project Lecture 4 11 / 48 Load Type: Dead Load The dead load, D, as specified in the NBCC must include the following: • the weight of the member itself • the weight of all materials of construction incorporated into the building to be supported permanently by the member • the weight of partitions • the weight of permanent equipment • forces due to pre-stressing
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BLDG / CIVI 390 Building / Civil Engineering Design Project Lecture 4 12 / 48 Load Type: Live Load The live load, L, includes the loads due to • intended use and occupancy, • snow, ice and rain, • earth and hydrostatic pressure, and • horizontal components of static or inertia forces.
BLDG / CIVI 390 Building / Civil Engineering Design Project Lecture 4 13 / 48 Live Load (NBC 2015)
BLDG / CIVI 390 Building / Civil Engineering Design Project Lecture 4 14 / 48 Live Load (NBC 2015) ... for the complete table refer to table 4.1.5.3 in the code
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BLDG / CIVI 390 Building / Civil Engineering Design Project Lecture 4 15 / 48 Live Load (NBC 2015) ... why these values?
BLDG / CIVI 390 Building / Civil Engineering Design Project Lecture 4 16 / 48 Structural Design Process A structural design process that results in an economical, safe, and serviceable design must: • be founded on knowledge contained in applicable building codes • be based on experience, research data, and judgment where there is no code guidance • be able to compare with different designs • be practical
BLDG / CIVI 390 Building / Civil Engineering Design Project Lecture 4 17 / 48 Design of Wood-Frame Buildings • Wood-Frame house structure • WoodWorks Design Office software • Use of the span-tables from CMHC Handbook
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BLDG / CIVI 390 Building / Civil Engineering Design Project Lecture 4 18 / 48 Preliminary Structural Design 1. Based on your conceptual design your group has selected a final design. Considering this final design or a revised version of it, perform the preliminary structural design using WoodWorks software. 2. Initially, you may assume the following dead and live loads to be 2.4 kPa, and 2.0 kPa, respectively. 3. Calculate the snow load using the NBC data pertaining to Montreal. 4. Construct a structural model in WoodWorks Sizer “Concept Mode” and perform the preliminary design. 5. Modify the dead loads if necessary to revise the “Concept mode” design 6. Revise the beam and column sections using “beam” and “column” mode in the software 7. Verify the design using CMHC Span Tables / Hand calculations
BLDG / CIVI 390 Building / Civil Engineering Design Project Lecture 4 19 / 48 Limit States Design
BLDG / CIVI 390 Building / Civil Engineering Design Project Lecture 4 20 / 48 Ultimate limit states — load combinations
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BLDG / CIVI 390 Building / Civil Engineering Design Project Lecture 4 21 / 48 Typical Roof Dead Load Checklist
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BLDG / CIVI 390 Building / Civil Engineering Design Project Lecture 4 22 / 48 Typical Floor Dead Load Checklist
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BLDG / CIVI 390 Building / Civil Engineering Design Project Lecture 4 23 / 48 Dead Load in the NBC
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BLDG / CIVI 390 Building / Civil Engineering Design Project Lecture 4 24 / 48 Calculation of dead load
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BLDG / CIVI 390 Building / Civil Engineering Design Project Lecture 4 25 / 48 Snow load calculations
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BLDG / CIVI 390 Building / Civil Engineering Design Project Lecture 4 26 / 48 Snow load calculations
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BLDG / CIVI 390 Building / Civil Engineering Design Project Lecture 4 27 / 48 Snow load — example
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BLDG / CIVI 390 Building / Civil Engineering Design Project Lecture 4 28 / 48 Snow load — example
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BLDG / CIVI 390 Building / Civil Engineering Design Project Lecture 4 29 / 48 Snow load — example
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BLDG / CIVI 390 Building / Civil Engineering Design Project Lecture 4 30 / 48 Snow load — example
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BLDG / CIVI 390 Building / Civil Engineering Design Project Lecture 4 31 / 48 Snow load — example
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BLDG / CIVI 390 Building / Civil Engineering Design Project Lecture 4 32 / 48 Snow load calculations • why case I and case II?
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BLDG / CIVI 390 Building / Civil Engineering Design Project Lecture 4 33 / 48 Wood-Frame House • balloon or platform construction?
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BLDG / CIVI 390 Building / Civil Engineering Design Project Lecture 4 34 / 48 Load — Observations
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BLDG / CIVI 390 Building / Civil Engineering Design Project Lecture 4 35 / 48 Platform frame construction
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BLDG / CIVI 390 Building / Civil Engineering Design Project Lecture 4 36 / 48 Lateral Loading Resisting Systems
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BLDG / CIVI 390 Building / Civil Engineering Design Project Lecture 4 Floor Framing
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BLDG / CIVI 390 Building / Civil Engineering Design Project Lecture 4 38 / 48 Floor Framing
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BLDG / CIVI 390 Building / Civil Engineering Design Project Lecture 4 39 / 48 Wall Framing
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BLDG / CIVI 390 Building / Civil Engineering Design Project Lecture 4 40 / 48 Wall Framing
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BLDG / CIVI 390 Building / Civil Engineering Design Project Lecture 4 41 / 48 Design with WoodWorks • Concept mode design • Beam design • Column design • Shear wall design
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BLDG / CIVI 390 Building / Civil Engineering Design Project Lecture 4 42 / 48 WoodWorks Design Office • Review the User’s Manual (from help menu) and REVIEW the SIZER tutorial • (You may download a demo version for practice at home)
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BLDG / CIVI 390 Building / Civil Engineering Design Project Lecture 4 43 / 48 Spanning capabilities of wood members
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BLDG / CIVI 390 Building / Civil Engineering Design Project Lecture 4 44 / 48 Sizing built-up wood beams Select two built-up beam sections that can satisfy the following conditions: 1. One-storey brick veneer house 2. Beam supporting main floor only 3. Supported joist length is 12’ (3.6 m) 4. Beam span is 13’ (4 m) 5. Grade of wood: SPF No.2 Use Table 15 of CMHC Handbook, acceptable beams are: • 5-2”x10” (5-38x235 mm) or • 4-2”x12” (4-38x286 mm)
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BLDG / CIVI 390 Building / Civil Engineering Design Project Lecture 4 45 / 48 Sizing built-up wood beams Select two built-up beam sections that can satisfy the following conditions: 1. One-storey brick veneer house 2. Beam supporting main floor only 3. Supported joist length is 12’ (3.6 m) 4. Beam span is 13’ (4 m) 5. Grade of wood: SPF No.2 Use Table 15 of CMHC Handbook, acceptable beams are: • 5-2”x10” (5-38x235 mm) or • 4-2”x12” (4-38x286 mm)
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BLDG / CIVI 390 Building / Civil Engineering Design Project Lecture 4 46 / 48 Sizing built-up wood beams Select two built-up beam sections that can satisfy the following conditions: 1. One-storey brick veneer house 2. Beam supporting main floor only 3. Supported joist length is 12’ (3.6 m) 4. Beam span is 13’ (4 m) 5. Grade of wood: SPF No.2 Use Table 15 of CMHC Handbook, acceptable beams are: • 5-2”x10” (5-38x235 mm) or • 4-2”x12” (4-38x286 mm)
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BLDG / CIVI 390 Building / Civil Engineering Design Project Lecture 4 47 / 48 Sizing Floor Joists Select a floor joist that is acceptable for the conditions as described below. 1. Joist supporting living room floor 2. Joist span 12’-3’’ (3.75 mm) 3. Bridging will be installed 4. Basement ceiling will be not finished 5. Grade of wood: SPF No.2 or better 6. Subfloor is 5/8’’ (15.9 mm) plywood nailed in place Also note that drywall or gypsum board ceiling finish can be considered a strapping. For this example floor joists can be considered braced with bridging and strapping • Use Table 20 of CMHC Handbook, acceptable beams are (do it yourself): • 2”x8” @ 12’’ o.c. (38x184 mm @ 300 mm o.c.) or • 2”x10” @ 24’’ o.c. (38x235 mm @ 600 mm o.c.)
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BLDG / CIVI 390 Building / Civil Engineering Design Project Lecture 4 48 / 48 Walls, ceilings, roof ... • identify the corresponding tables
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