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I am looking at a project where an existing old building has rotten floor joists on the 2nd floor (3 storey and roof). I am planing the support the floor from below and remove the rotten ends of the joists replacing them with new spliced joists. As part of the process i want to ensure the wall...

Can anyone point me in the right direction for information relating to line loads on unreinforced slabs. I need to check the adequacy of an existing domestic insitu ground bearing slab with a load bearing structural stud built off it. This is lightly loaded but I would like some further...

I am looking at a grandstand project. The seating etc. are all ground bearing with a cantilevered steel canopy roof over. the canopy cantilevers about 9.5m and it has been proposed to support this using 2No. columns at 1.5m ctrs. (back span 1.5m for rafter) (See attched sketch detail) In...

I am considering using piles to support drainage (uPVC pipes). In this situation how far apart should the piles be placed and should I specify a beam or precast floor slab unit spanning between piles to give continuous support. If a beam or slab is provided would it need extra piles to stabilise...

I have a project where the client excavated foundations to firm bearing for a house. In one corner rock (schist) was encountered over approx. 5-10% of the building footprint. Is it possible to found on the two stratums and provide a movement joint at the junction. If so what issues need...

Hi all, I have been asked to look at an existing semi-basement (retains max. 2.8m). This was built about 5yrs ago but has not yet been passed by the local authority. I have been asked to prove the basement structure as constructed is adequate. It was build using blockwork with an external land...

Hi, Has anyone any experiance in designing curved concrete stairs (without using finite element analysis software). A point in the right direction would be appreciated especially UK codes. Thanks.

I have to design / specify foundations for a house. The ground is soft at the surface and has stone below. The stone is in a firm clay and the depth to this layer varies across the house footprint from 1.4m to 2.1m (one corner). This stratum would be adequate for bearing but at the deeper corner...

Hi, If a portal is clad in blockwork to eaves (no sheeting rails) can it be assumed the blockwall (215MM thk.) between the flanges (305X165 Universal Beam) be considered as providing restraint to the column compression flange at the bottom of the rafter haunch. IF not has anyone any...

This is also posted on the storm/flood forum as i was unsure which would be the best location. Can anyone give me guidance on the construction, layout etc. for a grassed swale for stormwater run-off from a small hard standing? A typical detail would be great is anyone knows where i could get...

Can anyone give me guidance on the construction, layout etc. for a grassed swale for stormwater run-off from a small hard standing? A typical detail would be great is anyone knows where i could get one. Thanks Vinny

Hi, Can anyone recommend any good books on landfill gas extraction, gas well details and design information for the wells, piping etc.?

I have a number of domestic projects which require piled foundations(soft ground or filled ground). The foundation design is relatively simple, precast piles and ground beams would be the normal solution in the UK for the particular situations in question. I am wondering about the requirement...

Can someone point me in the direction of information relating to the position where longtitudinal eaves ties can be used in portal frame buildings? (is there a limit of say within d/2 of the bottom of the haunch). If an eaves tie is provided at a higher level (say mid depth of the rafter member)...

I have been working through SCI publication 087 (The behaviour of Steel Portal Frames in Boundary Conditions. Following the 1st design example I worked out I need 155mm^2 cross sectional area to achieve the criteria for longitudinal stability. I am assuming this is provided along the building...

I am seeking advice on foundation solutions for a domestic structure on varying strata. At one side the structure is on rock and at the other side at a depth of approx. 2.5m is a stiff gravel. Would the differential settlement be significant? I would expect the gravel to have a larger initial...

Hi, Im looking at a 2 Bay portal span about 30m double bay (ie 60m overall bay). Can the internal column (each frame) be designed to take moment or as a prop to the frame. Any Thought?

Hi all, If a bank (approx. 8m Ht.) of cohesive soil is excavated leaving a slope of about 60deg. (remains stable) and the owner wants to later add a retaining wall to serve as one wall of a building (garage). Should the wall be extended and the embankment re-graded to 2:1 or can the bank be...

Hi All, I have a building to design (large dwelling) near mature trees. The trees would be about 5-10 metres from the new building. I know a piled foundation would work but would also like to know if a raft could be used or if deep strip with compressible formwork to the sides would work. In...

Hi, I am looking at an attic conversion. The guy wants to remove the two central internal members of a double fink truss. I appreciate truss engineering is specialist but has anyone any suggestions on the type of strengthening required? Plywood Gussets either side / Reinforce the rafters...