Description of structural analysis and design of wood structures for “Model” School in Prishtina – Preprimary, Primary and Lower Second. The following summary of the structural and design analysis of wood structures for gymnasium, multi‐purpose room and roofs above the classrooms for the above referenced project.
- Gymnasium roof system
Gymnasium building is a single‐story structure consisting of concrete and masonry wall and wood/timber roof construction. Roof structure is designed to support gravity including 10 cm‐ thick extensive green roof and lateral loads. Gymnasium roof structure consists of simply supported 20 by 103 cm glulam beams spaced at 500 cm o.c. The glulam beams are spanning18.50 m and are supported with 40×35 cm reinforced concrete columns. Glulam beams support 13 by 28 cm glulam purlins that are equally spaced at 231cm o.c. spacing along the glulam beams. Purlins are attached to glulam beamss through channel brackets such that the top edge of glulams and purlins are at the same plane. Roof sheathing consisting of 22 mm‐thick, 48/24 span rated OSB structural sheathing attached to 5 by 15 cm solid sawn wood battens that in turn are attached to purlins at 60 cm o.c. spacing. OSB is attached with strength axis perpendicular to supports (purlins). Glulam members are minimum grade 24F‐1.7E DF‐Balanc. (NDS) or minimum grade BS16k (Eurocode 5, EN). Solid sawn lumber is SP #2 (NDS) or BS C24 (Eurocode 5). OSB should be manufactured in accordance with PS2 (USA), CAN/CSA O325 or Eurocode 5 (EN) standards.
- Multi –Purpose Room Wood Structure
The multi‐purpose room structure consists of glulam frame including 20 by 86 cm beams attached to 20 by 30 cm columns. Glulam frames are attached to concrete footing through fixed base connection at 500 cm o.c. spacing. At the entrance side of MPR, all columns are connected with 15 by 30 cm lateral beam at the column tops. Glass curtain wall is attached to glulam columns and supported with concrete slab at the base. First and last bay on the entrance side of MPR are reinforced with stainless steel FI 14 mm “X” bracing to resist lateral loads. All glulam members are grade 16k based on EN, Eurocode 5 standards. The secondary roof components including purlins, battens and OSB sheathing have similar sections and wood grades as in gymnasium with exception of purlin spacing that is 175 cm o.c instead of 231 cm.
- Roofs above classrooms
Roofs above the classroom areas consist of light framed solid sawn wood trusses installed at 120 cm o.c. spacing. Truss Top chords (TC) are built using 5 by 15 cm while bottom chords (BC) are built using 5 by 10 cm solid sawn lumber. Truss diagonals consist of 2‐2.4×10 cm solid wood boards attached to the sides of truss chords. Trusses are supported with 5 by 10 cm solid sawn wood slippers that are attached and /or embedded into the concrete slab below. Roof sheathing consisting of 22 mm‐thick(7/8”), 48/24 structural rated OSB sheathing panels directly attached to the truss top chords. OSB sheathing should be edge supported using either tongue and groove edges (T&G), minimum 2 clips per OSB panel or solid 5×10 cm blocking. Solid sawn lumber is SP #2 (NDS) or C24 (Eurocode 5) while OSB should adhere to PS2 (USA), CAN/CSA O325 (Canada) or Eurocode 5 (EN).
- Loads and load combinations
The design loads used in this analysis included the gravity and lateral loads based on the site loading data.
- Lateral loads include wind and seismic. Seismic and wind loads were evaluated in accordance with the design parameters provided. Our analysis indicated that wind loads provided the worst case lateral load conditions for multi‐purpose room while roofs above the classrooms and gymnasium roof are analyzed as part of concrete frame including seismic loads.
- The load combinations used to analyze the wood/timber roof and columns for this building include:
o Dead Load
o Dead Load + Snow Load
o Dead Load + Wind Load
o Dead Load + 0.75Snow Load + 0.75Wind Load
o 0.6Dead Load + Wind Load
- The wind load analysis was performed using Method 1 – Simplified Procedure, for both the Main Wind‐Force Resisting System (MWFRS) and Components and Cladding. The MWFRS was used to calculate maximum shear loads to roof diaphragm and wood framed glass curtain wall at multi‐purpose room. Components and Cladding method was used to analyze curtain wall and connections.
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|Client||“Model” School in Prishtina|
|Surface Area||570,00 m2|