In case the trusses have to carry more weight and have a longer span the home builder company บริษัทรับสร้างบ้าน will strengthen the building by bringing together the wood to make it thicker. by using a retaining ring as a device for fixing the joints of the building Structural engineers should be able to determine the dimensions of the joints and the anchorage.
- Placement of supporting parts for roofing material must be positioned at the joints of the truss only. so that the parts of the truss must not be subjected to bending.
- The vertical pieces hold the upper and lower main pieces together between the truss panels.
- May be anchored in the plane of the upper or lower body of the building between neighboring trusses.
- The corner support should be placed in line with the joint position of the truss.
- The trusses may be spaced up to 8′ (2.440) apart depending on the span length of the slat or purlin, or up to 20′ (6,095) apart.
- The span length of the fink truss is 40′ to 150′ (12 to 45 m).
- The truss depth is equal to the span length 2 to the span length 6.
- The span length of the flat trusses is 40′ to 110′ (12 to 33 m).
- The depth of the truss is equal to the span length of 10. to a length of 15
- Assembled trusses. There is a compression-bearing structure of wood and a tensile strength of steel.
- Steel bars are the tensile building elements in the trusses.
- Truss beams are made of wooden beams with steel bars. It is a triangular component such as diagonally or vertically.
- Generally, the wood part used is 2″ or 3″ thick and has a width of at least 35⁄8″ (90). Use a 2½” (64) ring or a minimum 5½” (140) width. ) use a 4″ (100) ring
- The overlap of parts or building elements of a wooden truss should not exceed 5 pieces (at the joint area).
- Purlin at the connection point or diagonal part of the piece. act as a purlin to support the sheet
cover the roof
- roof cover
Examples of Belgian trusses
The home builder’s รับสร้างบ้าน structural engineers determine the dimensions of the trusses and the joints of the trusses. by considering the type of truss Weight carried, span and type of wood
- The critical point of the compression element is buckling, while the tensile critical point is at the junction of the truss element.
- Should check the building law requirements before designing.
- The total joint point should be aligned with the center of each part. To prevent shear forces or bending moments outside the joints with the parts.
joints at the support point
- Minimum support distance 5½”(140)
- Angle steel plate
- Supporting sticks
- Steel plate
- Support columns
- Steel plate.
- wooden planks
- Bolt device with retaining ring.
- Assembled columns are of the same thickness as the thickness of the truss.
- Long bolts
- Anchor bolt
- Steel sheet placed on the mortar.
- Load-bearing walls, concrete or construction materials.
Trussed wooden rafters
Trussed timber rafters are often designed as a single plane and are factory assembled. Each component material must be able to withstand compressive and tensile loads. Typically a 2″ × 4″ or 2″ × 6″ lumber is used for the main piece. Trussed timber rafters are suitable for buildings requiring spans of 18′ (5,485) or more and rectangular floor plans such as warehouse buildings, factory buildings, etc. However, consult a structural engineer or manufacturing company.
- Covering the roof with roof coverings. It is similar to fastening the rafters with purlins.
- The distance is generally about 2′ (610), but can be as much as 4′ (1,220).
- The building will be attached to the joint area with steel plates nailed with nails.
- The supporting building body is perpendicular to the plane of the truss.
- If there is a ceiling The ceiling will be attached to the building below. If the distance between the trusses exceeds 2′ (610), the ceiling panels may not be longer. Therefore, it may be necessary to use an extra rough in the middle.
- Insulation panels and various piping systems. can be placed in the depth of the truss
- The upper main piece can protrude from the wall by no more than 2′ (610).
- Slope 2 : 12 to 8 : 12
- The truss depth is approximately equal to the span length 10 to the span length 20.
- Generally, trussed timber rafters can span approximately 20′ to 32′ (6.095 to 9,755), but may also span up to 60′ (18 m).
- May be able to extend up to 1⁄4 of the internal span If the end of the overhang is still in the form of a truss or has supporting parts
- roof cover
- Main piece on
- Standing or supporting pieces.
- Ceiling with vents.
Main piece roof overhang
- roof cover
- The upper main piece protrudes from the building line.
- Support the main piece on