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  1. YuleMsee

    Void Column In Reinforced Concrete column At Beam Junction

    I've been retained as a structural engineer in a fit out job on an existing building. I've been retained as a structural engineer in a fit out job on an existing building. An inspection of the existing building revealed this construction defect, a big void on the column at the beam - column...
  2. YuleMsee

    Re-purposing An Overhauled 40KVA Generator

    I'm a structural engineer involved in a project where a 40KVA generator has been replaced with solar and backup batteries. The client has asked the consulting team to come up with ideas on what to do with the overhauled generator, its old but working fine. Other than the low lying fruit of...
  3. YuleMsee

    Concrete Void At Beam Column Junction

    Can concrete repair mortar patch this up or is hacking off the top of the slab and redoing the concrete a better solution? Don't worry, I instructed that all slab bays around that column be re-shored.
  4. YuleMsee

    Masonry Wall Cracks

    @JAE, Your point 3 is somethimg to ponder on, I had not checked that strap beam but I noticed its not as deep as I expected from similar projects I've done before. I'll ask for a thorough review of walls running along gridline 4 & 11 / D-F to see whether there is any cracks, tho they are...
  5. YuleMsee

    Masonry Wall Cracks

    Did a site visit for an 18month old building since exterior renders were done but 4 year old since masonry walling was done experiencing masonry wall cracks. The building sits on very hard rock, 1m below the ground. A year ago, the neighbour off gridline "F" starting excavation his basement, the...
  6. YuleMsee

    Vibrating Residental Floor, 150mm THK. R.C, 4x6m Spans, Internal Bay

    Need advice on the simplest method of stopping that slab from vibrating, vibration is felt just by walking. Owner needs to the sell the unit and it chases away potential buyers. Answers I've got so far, 1. Increase depth of screed and re-do the floor finish. 2.Introduce a steel beam below...
  7. YuleMsee

    Vertical Cracks Starting At Junction Of Infill Wall And 1st Floor Beams

    Follow up question, what would be the best method to fill those cracks after introduction of a flexible fill between the new wall and slab soffit
  8. YuleMsee

    Vertical Cracks Starting At Junction Of Infill Wall And 1st Floor Beams

    Masonry infill wall was constructed and 6 months later this cracks that start at the junction of the wall and the soffit of perpendicularly running 1st floor beams have occured, 3 in no. all starting at a beam junction. Wall is natural stone masonry, 200mm thick 1st floor slab has offices with...
  9. YuleMsee

    Cantilevered Truss, Whats The Best Assembly

    @Littlewheels, Going by that then my go to assembly is no. 3, to ensure biggest axial force is tensile. Element material is steel hollow sections as below @BAretired Well, I thought the photos would be clearer. First photo is moment (green) and axial (beige) element forces, second in pink is...
  10. YuleMsee

    Cantilevered Truss, Whats The Best Assembly

    Analysed the 4, deflections vary slightly, is there a better arrangement specifically for cantilevers?
  11. YuleMsee

    Apartment Building With Very Large "Seperation" Crack

    @HTURKAK I would like to remind you , provide more details to get better answers.. I just did a recon visit, so I don't have all details, if my quote is agreeable to the developer I'll have more information
  12. YuleMsee

    Apartment Building With Very Large "Seperation" Crack

    @dhengr What do the structural framing details look like in this area, on this grid line, and how could they be influencing the cracking? Is there paint or dust and crud in the cracks which would indicate that they have been there for a long time? Do similar cracks show up all along grid C...
  13. YuleMsee

    Apartment Building With Very Large "Seperation" Crack

    @gte447f my gut instinct would be that the cracking might likely be the result of something inherent to the original structural design or construction, because stress concentrations or risers are naturally likely to occur at such discontinuities. I think I would start by recommending some sort...
  14. YuleMsee

    Apartment Building With Very Large "Seperation" Crack

    @HTURKAK "My suggestion would be , lifting the settled ftgs to original level , underpinning of the foundation." How do you achieve this for a strip footing?
  15. YuleMsee

    Apartment Building With Very Large "Seperation" Crack

    @JoshPlimSE There is no dry wall, the wall os plastered and painted on the interior and key finish for masonry mortar joints on the exterior. Yes, the cracks go thru beams and floor slab as seen on the third photo, the exterior wall photo Building is 14 years old, cracking has occured within...
  16. YuleMsee

    Expansion joint or not for 200m long concrete building,

    @hoangvhuy Time to have a sit down with architect and developer as the joints will be required. Architect will have to shift things to accomodate these joints. How is the ground, is it uniform along the length?
  17. YuleMsee

    Apartment Building With Very Large "Seperation" Crack

    @SlideRuleEra On seismic, we are in a low risk seismic region Ground water could indeed be an issue, The property sits at the brow of a slight hill, two sides as indicated fall about 30m in height in a steep slope 1:2.5 and the bottom is a seasonal stream I noted the neighbour on the north end...
  18. YuleMsee

    Apartment Building With Very Large "Seperation" Crack

    Did a recon visit to a building I've been asked to give an opinion on for the cause of cracking and recommend remedial measures. Photos and a preliminary structural layout are attached. The building has ground + 3 suspended levels then a pitched roof, gravity load path is through load bearing...
  19. YuleMsee

    Hollow Pot Slab (One way Spanning Hollow Forms) Load Sharing?

    @covertshear, Yes thats it
  20. YuleMsee

    Hollow Pot Slab (One way Spanning Hollow Forms) Load Sharing?

    I have a slab, made of hollow forms 375mm thick with a 75mm concrete topping reinforced with A98 steel mesh, 5mm wires at 200mm square spacing, total depth 450mm, 125mm wide joists spaced at 500mm on centre. Partition walling needs to be introduced, some running parallel to the joists, when...

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