At the moment I have a small negative moment in the bottom section of wall. i.e. the inner face of the wall at the btm is in tension and at mid height the outer face of the wall is in tension.
When I calculate the fixed end moment in the slab and redistribute it at the wall the moment being...
Thanks for the reply. This is what I was doing although the example had me design the reinforcing before moving on to the base design. (I thought this was odd)
My tank is 15m dia. internal x 6.0m ht. with 300mm thick base and wall.
The forces I got in the fixed base wall design were M (vert)...
Hi,
I an following a tank design from 'The Design of Water Retaining Structures - Batty + Westbrooke'
I have bee looking at the RC circular tank with a fixed base 15m Dia.
The calculations suggets checking the wall with a fixed base and calculating reinforcement etc. then when designingt he...
I passed the exam a number of years ago but never came across this manual, the concrete manual gives you the info you need for the paper, in scheme design section take the concrete principles and apply they to the other materials. I.e discuss load transfer to foundtaions vertically and discuss...
I am not relying on the beam totally but am assuming it will stiffen the edge of the slab and support 1/2 - 2/3 of the slab on the curvature ( approx. width supported 400mm) I designed the section of slab supported at the ends as simply suported and carrying the load applied to its own area and...
Thanks,
I am designing by hand but have the design done. Also I would be interested in anyones thoughts on this situation if the beam is an up stand. (up stand maybe 215 wide X 300mm Ht.)
Hi,
I am looking at a design of a rectangular balcony slab with 1 outer curved edge, the slab is well supported on the ends (built in) and also has a small amount of support at the ends of the curve, I would estimate the curve has a max. offset of 550mm and has an edge beam (down stand). As the...
Reinforced Concrete filled Steel mini Piles
Hi all,
Can anyone advise me of where I can find info on the design of reinforced concrete filled steel mini piles (preferably UK). The piles would be approx. 220mm dia with a central length of rebar.
As I see it I need to consider design for load...
Hi all,
I have a large gas genset (approx. 100KVA) when it is running for a while maybe 6-24hour I have notices the oil pressure is variable - this is normally around 5-5.5 bar but some times is dropping to approx. 2.8 bar this often returns to the correct pressure after approx 10 mins although...
Steel Frame or Not
I have a project where the architect had proposed a steel frame the building has dimensions 20x11.5m, 7.0m to eaves - with not internal walls etc. The budget is tight and the architect wants to investigate the possibility of using an external walls of 100/100/215 with steel...
The concrete had a brushed finish - after being tamped it was simply brushed with a rough brush. No trowelling.
Tne concrete was likely to be 20N/mm2 compressive strength or possibly 30n/mm2. Air entrained concrete would not have been used. Usually the temperatues are not to cold when we are...
The concrete has a brushed finish. Adjacent to the walls of the dwelling etc. it seems to be in perfect condition.
The spalling has occured all over the slab where there was no additional shelter from the walls - it is small flakes at the edges but on the surface of the slab the spalling is...
Hi,
I have a residential project where a concrete yard area was poured. Approx. one and a half months later a cold snap came (temperatures 0 to -10 Deg Celceus). The concrete has spalled significantly on the surface and along the edges.
As the concrete was placed for this length of time I...
Hi Guys,
I hope you can help. I have a generator which has a piece of hardware for monitoring purposes. The hardware allows me to plug in a monitor and keyboard/mouse. When I plug these in and reset - the computer loads to the microsoft windows 95 startup menus. Here I have a number of options...
I was proposing to use bar throughout but at the junction and for approx. 2-3m each side I felt that adding additional bar and designing this section to bridge between would act like a transfer slab and make the potential movement more gradual hopefully preventing serious cracks.
I have been asked to look as a domestic foundation solution for a site. the ground conditions are generally good (firm under foot) sandy gravelly ground. In one area of the building the contractor has gone through this layer into a different gravelly layer but of similar firmness.
To avoid the...
I have a large slab with a combination on longitudinal and contraction joints. Within the slab are a number of gullies and aqua channels. The channels are in line and approx. 2m long with a 2m gap between.
Q. should I make sure a joint in the slab runs along the line of aqua channels as if they...
Using either the steel or concrete lintel it would be worth looking at a strapping detail at the bearing points. using a 30X5mm strap plugged and screwed to the wall at close centres and screwed/shot fixed to lintel would increase the resistance to overturning.
If you place 1No. 215Dp. RC lintel over another and have a mortar bed between could these be considered to act compositely and have an increased effective depth therefore increased the capacity?
If not would you be able to add the 2 shear capacities together to increase shear load. (both would...
