All, does anyone have advice on designing load bearing fire walls and connections with light gauge? Understand that the fire protection is mainly provided by a fire resistant plasterboard and that the temperature in the flanges differs which causes thermal bowing and reduced capacity. Are there...
Hi all, interested to know what approach people use for the design of reinforced concrete piers in extremely reactive soils ie ys>75mm. Depth of suction is about 3500mm. Have always tried to have piers that found through to the stable soils with some slipery mechanism (black plastic etc) yet for...
Another week has past and it appears there is some self healing although further repairs will be needed.
I have just learnt that the 2 joints in the structure are construction joints (continuous reo and a scabbled face). Not sure what the designers intentions were though. The design could work...
All, We have been asked to provide a forensic report on a brand new 30m diameter x 3 metre high circular water retaining structure that is leaking. Cracks have formed every 1-1.5 metres around the entire circumference and they have not self sealed after a week. The curved walls were poured in 2...
HTURKAK - The bed has 2 steel H beams that are designed to take the compression from the stressing. There will be a small eccentricity from the centroid of the H beams to the centroid of the stressing tendons. About 50mm max although will design for 100mm. Live and dead ends are inline with the...
All, we are looking at a residential house design that is approximately 40m long and 8m wide. Located in moderately reactive soils and builder would like to pour as a waffle slab. It falls outside of the applicable residential standard and we would like to avoid having an expansion joint in the...
All, when designing a concrete prestress bed what factor should you apply to the forces geneterated by the jacking heads to convert them from working to ultimate forces? Considering between 1.25 and 1.5 yet some recommendations would greatly appreciated.
Thanks for the input.
The facility is a precast concrete yard so just by the nature of the buisiness they are limited to one/two heavier lifts (but not necessarily max capacity) per day per precast bed and a number of lighter loads ie reo cages. There isn't a detailed record of the entire...
Hi all, We have been approached to provide structural engineering advice/maintenance measures for the ongoing operation of a number of 50 year old overhead gantry crane rails enclosed in an even older shed. There are two rails. One was originally rated to about 30t and the other 10t. The rails...
How do people calculate the lateral wind loads from a shade sail on a cantilevered column? I have heard of a rule of thumb that the uplift load can be applied laterally although does anyone have anything more precise?
Additionally how do people determine the lateral tensile load from rigging...
Thanks everyone for responding. It seems the footing system will only take the full earthquake load once the walls have developed plastic hinges or exceeded their capacity. If the walls are designed and detailed correctly this should not occur. It would seem excessive then to design the footings...
Is anyone able to clarify the link between the mew and Sp values for RC walls and which values are relevant for designing footings to AS 1170.4 and AS 3600?
Section 11.2 of AS3600 asks for an analysis to be performed with mew of 1 and Sp of 1 to determine if there is any compression/tension in...
Is anyone able to clarify the link between the mew and Sp values and which values are relevant for designing footings to AS 1170.4 and AS 3600?
Section 11.2 of AS3600 asks for an analysis to be performed with mew of 1 and Sp of 1 to determine if there is any compression/tension in the...
