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Hi All, I've been asked to scheme up a foundation design for a 4 Storey Modular building. This type of building design is new to me. Modules arrive on site in 3m X 12m Pods. Rock is close in the subgrade so the plan is to provide lean mix on rock and provide pads at the grid spacings above...

Hi, I have an existing timber joist floor which spans 3.6m. Joists are 44x225 at 450 centres. The client wishes to add an additional floor to the house above these joists. So now I will have a line load (load bearing stud wall) going perpendicular to these joists at mid span which supports...

Hi, I have a window lintol sitting onto a 100mm wall 90 degrees to the wall. But....It's at the end of the wall though. I'm not comfortable with the detail as the load spread is only in 1 direction. Anyone do this before?? Thanks.

Hi All, I've just looked at a 150 year old 3 storey house for a client. The house was part of a very long terrace at some point (circa 20 houses). The houses on both sides have been demolished leaving it detached. I've noticed a significant horizontal open crack at 2nd floor level (outside -...

I've been asked to look at the following issue. A domestic roof engineered truss has had the bottom cord cut to install an attic access hatch door. It has been cut adjacent to a node point. One truss cut only at the third point. The node gang nail at the cut point looks in distress and has...

Hi. I have an undersized loft beam which was installed in error. Beam is at wallplate level. I need to increase it's strength to get it to work in terms of buckling and deflection. The following thoughts are coming to mind. A. Take down ceiling, Jack the beam and weld on a T section to increase...

Hi, A client of wants to build on a single storey extension onto the rear of a 2 storey house. He wants to interconnect both rooms which means taking out 50% of the original rear wall of the house at ground floor level on one side of the house. Should I be concerned about lateral stability along...

Hi, I'm underpinning an existing strip footing to a single storey cottage with a series of micropiles. The footing is unreinforced. Does anyone know how to calculate the bond strength capacity between the existing strip footing and the grout of the new micropiles?

Hi, I have an interesting scenario where the client wants a hipped end extension roof but wants a vault ceiling effect. See sketch attached. I'm obviously concerned about roof spread. He wants to maintain the vault around the corner which is a lean to roof effectively. I'm not too concerned...

Hi, I have a light weight 3 storey timber frame building sitting on RC podium Slab. One end of the podium can be tied into an existing building which is braced. The opposite end is a free end which is not braced. My query is stability related. Should I design the column and beam arrangement...

Hi All, I need to underpin a subsiding single storey house on one side. My problem is I have limited access to underpin from the outside. The house is founded on what appears to be an unreinforced raft. One thing that has always bothered me is if I drill micro piles at a slight angle down...

Hi All, I have a scenario where a 2 storey house extension edge wall sits eccentrically on a strip footing (outer edge of strip). I have gravels at 500mm down from formation and my geotech says the design bearing capacity of the gravels is 175kN/m2. The strip fails in bearing due to the block...

Hi, I need to design a concrete raft slab and I just wonder what on site test would be most accurate for determining the soil bearing capacity. Also I will need to estimate potential settlement. So would a plate bearing test or spt test be best suited. Also would any other lab tests be...

Hi All, See attached borehole log for a site I'm working on. The project is the construction of a 2 storey rear extension to a mid terraced house where access is just non-existent (i.e. through the house). There are buildings on all 3 sides of the site where the extension is going in. As you...

Hi guys, I have a suspended insitu concrete slab and ground beam supporting a 2 storey house extension which is founded on 200 CFA piles at 2m centres. Ground beams and slab are monolithic. At the edge of the site the wall loads are tight up against existing boundaries which induce an eccentric...

Hi All, I am currently designing a 4 storey retail building in a city centre which is open to the public. It is less than 2000m2. In your view does this fall into the class 2b category for a disproportionate collapse design check?

Hi All, Just got our SI interpretive report back for one of my projects. Geotech is recommending a raft slab on grade. He has calculated 43mm potential settlement. Loads on columns are 1000kN. I can't understand why he's not recommending piling and avoid any potential settlement. Any comments...

Hi guys, I need to pile a house due to poor ground. I'm used to providing piles in groups of 2 and then span a ground beam between this 2 pile group pile cap. But this has been for larger commercial projects. Other Engineers spec a serious of piles at 2.5m centres centred under the ground...

Hi, I'm sure Engineers often ask this question. What is the best site investigation method to determine the actual bearing capacity of a soil for small 2 and 3 storey domestic projects? Any tricks of the trade?

Hi Everyone, Interesting one for you all. My Arch won't let me use a box section or UC column sections in my sway Frame. I have a UB section for the horizontal cross member but he insists on using Circular Hollow Sections for the columns. My query is how do I make the connection of beam to...