New clauses relating to the effect of trees (single and groups) on soil profiles will be addressed as well as new soil salinity provisions.This session will also address the changes to the suction values (pF) for various locations in Australia.Soil properties and soil tests will be extensively covered including various shrinkage and swelling properties of Australian soils.
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As 2870 Residential Slabs And Footings Printer Code Has NewThe 2011 code has new clauses relating to the effect of trees (both single and groups of trees). The session will be concluded with a tutorial example on calculating the surface movement ys using soil shrinkage index values, suction values, soil layer thicknesses to then achieve a site classification (eg M, H etc) 10.30 11.00 Morning Tea 11.00 12.30 SESSION 2 Footing Systems to AS2870-2011 This session looks at the various forms of construction and the footing systems that are appropriate for those construction types. The forms of construction that will be discussed include clad frame vs articulate masonry vs masonry veneer, vs articulated masonry veneer vs full masonry (ie double brick). The footing systems that will then be presented in detail include raft slab, footing slab (ie SOG), waffle slab, stiffened slab and strip footing. Reinforcement requirements for these footing types (ie bar vs mesh) will be discussed as well as the new Code values for footing depths D. In particular, the waffle slab system will be addressed in detail due to its growing usage in domestic construction over the past 20 years. The pros and cons of using this waffle slab system will be covered in detail so that engineers and builders do not get caught out on site. The properties of the polystyrene pods will also be covered including proper disposal of these units. ![]() Bored concrete pier vs steel screw piles will be compared including the decision for choosing one system over the other. Lunch provided at venue 1.30 3.00 SESSION 3 Structural Design of Footings to the new AS2870-2011 This session covers the theory behind the structural analysis of residential slabs and footings. Topics to be covered include bearing pressures from single vs double storey construction, deformation in footing due to centre heave and edge heave, line load and edge load. This then relates to the two differential mound movement philosophies in the code namely the Mitchell Method vs the Walsh Method. The session will then explore the basis behind the Beam Stiffness vs Soil Surface Movement graph (Fig 4.1 in AS2870) - its derivation and its use for determining a footing depth based upon beam spacing, soil profile and (rather than reading off the simplistic and sometimes conservative D values from the Code tables eg Table 3.1). As 2870 Residential Slabs And Footings Printer Full Structural CalculationsFull structural calculations will be provided to show designers the method of design beams and slabs using standard engineering principles and accounting for hogging vs sagging, applied moment, stiffness of the system (ie EI), rigid vs flexible slabs with particular emphasis on the two methods mentioned earlier ie Mitchell vs Walsh methods. A tutorial exercise will be conducted in the last part of this session to give attendees the confidence to determine the depth of beam required for a particular soil site classification (eg H), construction system (eg Masonry), slab system (eg Waffle) span (m), beam spacing (m), effect from trees (single vs group) etc 3.00 3.30 Afternoon Tea 3.30 5.00 SESSION 4 - Other Concrete Issues eg mix design, cracks This session addresses the remaining factors that affect domestic slab construction. Other topics to be covered include minimization of cracking on slabs by attention to weather conditions (ie temperature, humidity and wind speed to be able to quantify the potential for plastic shrinkage cracking) as well as the use of admixtures, evaporative retarders and curing compounds to assist in cracking minimization, Other non structural crack issues such as crazing, plastic settlement cracking as well as durability and corrosion control points will be highlighted (especially in saline soils) then finally proper joint saw cutting techniques (where required) will be covered. QuestionsSummary, Feedback Sheets Certificates of Attendance.
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