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Recent content by lexim

  1. lexim

    Beam Raft

    Hi AnaAnt, I agree with Hokie66 that the bearing capacity will not be an issue as the entire slab (including beams) is spreading the loads. I have also designed several buildings with raft foundation and they have performed optimally for over twenty years. First to deal with your question #1...
  2. lexim

    Centralizers on Augercast Piles

    I worked on a project last fall into winter and these were used at spacings of 6000mm in cased auger piles. Regards
  3. lexim

    Trail Bridge Design

    We combine the AASHTO's guides for pedestrian bridges and section 3.8.9 of Canadian Highway Bridge Design Code, CAN/CSA-S6-06.
  4. lexim

    Fabric Covered Structure

    I agree with JAE that the design be qualified an full disclosure regarding the necessity for removal of the cover during the times agreed. Good luck
  5. lexim

    New footing to be installed over existing footing

    Hello All, if I am not mis-interpreting the sketch, I think the new footing will be just at the edge of the old footing and above the old footing? If this is so, my thoughts will be to excavate the new foundation to the base level of the old footing (with 45deg sloping out), and fill with...
  6. lexim

    Reinforce Existing Concrete Structure

    A principle of using fibrewrap link; this information may be of use to you and be a starting point for your design, http://www.iiees.ac.ir/iiees/publication/Jsee/jsee15_3.pdf We use this pretty often on bridge structures built over many decades ago so as to get some more service life from them.
  7. lexim

    Large Concrete Tank Design

    Designing the structure with pilaster columns within the tank will be a very Safe option, I will rather add tie beams probably with gratings and walkway to connect the columns. On the wall design, the wall will have hoop stresses (compression and Tesnsion for load cases) better to modelthe...
  8. lexim

    tank vertical movement and bund slab joint

    Hi apsix, To give this a shot;my responses in CAPS I'm assuming that there will be some vertical movement as the tanks are filled and emptied. THERE WILL BE MOVEMENT BUT IMMEDIATE WILL BE PRETTY HIGH AND LONG TERM CONSOLIDATION WILL BE VERY INSIGNIFICANT ( so do not worry). The tanks are...
  9. lexim

    Canadian Highway Design Bridge Code Design Examples

    Hi IHCal, See "CSA S6-06 Highway Bridge Design Code" for reference and the attached pages will give some information on the loading. Please use the CL-800 i.e. 800kn as the total semi trailer load. Regards...
  10. lexim

    circular raft design

    Hi Okey1, As per books and references you could also read up design principles in "foundation design' by Tezaghi and Peck. Bowles Joseph also has a discussion on the Bossineq method too. From experience I want to advice that you model this in some structural analysis program if you got access...
  11. lexim

    parking lot light poles

    Some impact resistance is required in parking lot light poles but i wouldn't worry about this as the speed of vehicles usually very very low. This impact force can be taken by the rigid bolted connection at the base plate to forestall the pole breaking and damaging opposite and adjacent...
  12. lexim

    Effect of shear at column base on foundation design

    agallag, BAretired has made the explanation very simple and I designed this situation of reactions for a few electrical street light poles with stub columns at about 1.5m high from foundation base. Thanks BA. Lexim
  13. lexim

    Design Wind Speed in Lagos, Nigeria

    INFORMATION CAN BE OBTAINED FROM THE LOCAL METROLOGICAL DEPARTMENT AT ONIKAN, LAGOS. AND YOUR REFERENCE OF LOCATION WILL DETERMINE THE EFFECTIVE PRESSURE YOU MAY REQUIRE FOR BUILDING DESIGN. FROM EXPERIENCE V.I. IS ABOUT 47 - 60 KM/HR (VERIFY?)
  14. lexim

    Curved Concrete beam in elevation

    Hi, A good reference book is " Reinforced Concrete Designer's Manual" by Reynolds & Steedman. An excellent book. Lexim
  15. lexim

    Steel beam encased in concrete.

    Hi jvolk, From an investigation point of view i.e supporting either side of the beam where the inspection is to be carried out. An elemental width of the concrete beam may be chipped off to the top of the bottom flange and also at the side of the concrete beam(at a position). The width and...
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