CIVL3811 Tutorial Solution - Week 12 PDF

CIVL3811 – Tutorial Solution - Week 12 Possible Solution Question Prepare general arrangement plans and sections to show the typical layout and proposal of your desirable floor and foundation systems for this building. Please write all your assumptions. You may a...

CIVL3811 – Tutorial Solution - Week 12 Possible Solution Question Prepare general arrangement plans and sections to show the typical layout and proposal of your desirable floor and foundation systems for this building. Please write all your assumptions. You may assume any other extra technical information required. The drawings should be presented as a simple (clear and clean) hand sketch. Assumptions: It is assumed that the slab depth will provide adequate room for services and ducts and will not interfere the design of the floor system itself. Column spacing for level 1 and the upper floors is primarily 8m, however, in the North-South direction a span of 10m will be used It is assumed that without internal columns in the column free zone on Level 1, the beams can support its own self weight. The stairwell is non-load bearing It is assumed that the roof and plants are negligible. It is assumed that the offset of the upper floors will not affect the overall load bearing capacity of the floor and its design. It is assumed that the service core is load bearing and will be treated as if it can be used as a column. However, the external perimeter of the building will not be considered to be load bearing and so columns will be required. The basement level (Level 1) is on the foundation, which is the design proposed below. It is assumed that the geological profile is uniform in nature and homogenous The settlement of the building will be uniform and will ultimately not significantly impact the pile Level 1 Design The primary layout is an 8x8m grid whereby the service core acts as a load bearing wall and so will contribute as part of the span of the system. Primarily a post-tension prestressed system will be utilised throughout the building with band beams running in the north/south direction along the columns Within the open area with no columns, as the span is quite large, a truss system will be used to span in the north/south direction. The truss can be decomposed into 4 sections for ease of access throughout the city and be assembled onsite. Level 5 Design Here the layout will be using columns spaced at 8m spans with the north and south span of columns along the east and west wings spanning 10m to accommodate for a consistent aesthetic and ease. Again, a post tension pre-stressed system will be the primary reinforcement system used in this slab as the spans are optimal for a PT system and due to the varying dimensions of the column spans (10m v 8m) Band beams will run in the north/south direction to support the columns. Foundation Design A combined footing will be used for the footing system whereby a pile cap will be supported by 4 CFA piles with a diameter of 600mm. It is not ideal for a pile to be driven through the water table as there will be a constant pore water pressure applied which creates uplift and can be detrimental to the building, causing cracks. The pile will be driven to a depth of 2.5m, whilst the depth is not ideal for sufficient load bearing, each column load will be supported by 4 piles driven to 2.5m. To add additional loading capacity, a steel reinforcement cage will be placed within the pile and tied within the pile cap which will be connected with the column.