Posted: May 11th, 2022

CIVL4120 – RESIDENTIAL FOOTINGS, TIMBER AND MASONRY DESIGN 2018 TIMBER DESIGN ASSIGNMENT

CIVL4120 – RESIDENTIAL FOOTINGS, TIMBER AND MASONRY DESIGN
2018 TIMBER DESIGN ASSIGNMENT
As a consulting structural engineer, The College of Newcastle has engaged your companies to supply a part of the structural design for a brand new timber framed laboratory constructing. The constructing is to be designed to precisely duplicate the general dimensions of an present laboratory constructing (Refer drawing DR9155123 – Portal body shed.pdf). Nonetheless, the proposed new laboratory will use timber structural members, together with bracing, to help metal purlins and girts and metal roof and wall sheeting. That is in distinction to the prevailing constructing which makes use of metal structural framing.
GENERAL DATA
– The general dimensions for the construction are proven on the hooked up drawing.
– The related Australian requirements are for use.
– Roof and wall lifeless load (sheeting, purlins/girts, bracing and companies) = zero.three kPa – Roof imposed load = zero.25 kPa
– Earthquake information – earthquake loading is assumed to not be important for this construction
– Wind information:
o Roof suction (North-South and East-West winds) 1.zero kPa (final),
zero.55 kPa (serviceability) o Wall strain (windward partitions) zero.85 kPa (final), zero.5 kPa
(serviceability) o Wall suction (leeward and facet partitions) zero.6 kPa (final), zero.35 kPa (serviceability)
PORTAL FRAME: Design is required for the timber portal body at Grid 2. The portal body should resist gravity and wind masses. The next info is offered:
– The portal members (columns C1 and rafters R1) are to be constructed utilizing “Combined Australian Hardwoods” – seasoned. The timber obtainable has a stress grade of F27.
– Assume that the timber is accessible in rectangular sections of width b = 120 mm and depths d beginning at 190 mm and rising in 50 mm increments (that’s, 190, 240, 290, and many others). Use the identical cross part dimension for the columns and rafters.
– All design loadings for the construction (besides column and rafter self weight) have been decided and are offered within the normal information (notice that these are forces per unit space performing on the roof and partitions).
– Knee braces (member K1 within the hooked up drawing) usually are not for use.
– The places of purlins and girts are as proven on the hooked up drawings. Assume that purlins are hooked up to the highest fringe of the rafters and that girts are hooked up to the skin fringe of the columns and that fly bracing is not going to be offered.
Duties:
a. Evaluation – Utilizing Multiframe (or equal software program) and the design masses offered, analyse the portal body to find out important design actions for the columns and rafter (energy restrict state) and demanding body deflections
(serviceability restrict state). (10 marks)
b. Member Design – Decide an appropriate cross part dimension (b and d) for the columns (C1) and rafters (R1) of the portal body to fulfill energy and serviceability necessities. Present all assumptions and calculations. (10 marks)
c. Connection Design – Design a nailed connection for the second resisting connection between the column and rafter. (eight marks)
d. Present a abstract of your design with engineering sketches exhibiting all related info. (2 marks) Hints:
1. Each the columns and rafter are subjected to mixed bending and axial actions in addition to shear.
2. The results of length of load have to be thought-about for each the energy and serviceability restrict states.
three. For the Serviceability Restrict State make sure that
Rafter sag beneath everlasting loading G doesn’t exceed span/250 the place the span on this case is the whole span from Grid A to Grid C.
Lateral column deflection (sway) at eaves stage on account of G + Ws doesn’t exceed column peak/150
(neglect any deformations occurring within the joints)
CROSS BRACE:
Duties:
a. Design a timber cross brace to run from the highest of the column at A2 to the underside of the column at A3. The cross brace have to be designed just for the last word restrict state (assume deflections usually are not important). The cross brace is to be constructed from MGP15 (seasoned) timber. (four marks)
b. Design and element a 2 bolt connection between the timber cross brace and the column base at A3. (2 marks)