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  1. trilinga

    Combined footing question

    Gus14 Your question is very valid and needs to be addressed in design. In all practical designs of combined footings, this problem exists. First of all, the actual loads may be different from the estimated loads. Secondly, we design for the worst combination of loads only. The loading...
  2. trilinga

    SF and BM Formulas

    The easiest way to do it manually is to use Moment distribution. With only two spans, you need only two cycles, viz. one balancing + one carry over and another balancing. (I presume that the extreme ends are simply supported). You only have to obtain the Fixed end moments and the shears for the...
  3. trilinga

    Main problems you encounter as a structural engineer

    As a structural engineer who worked for 36 years in the design engineering of buildings, power plants and process plants, I consider the following as the inherent and unavoidable hurdles for a civil/structural design engineer. 1. The sequence of engineering activities of plants is as follows...
  4. trilinga

    RC cantilever slab

    I feel that there is no need for considering beam, column combination for this structure, though it is another way of supporting the structure. The slab portion covering the balcony area can be treated as a simply supported span with an overhang. Since the walls are of masonry, there will be...
  5. trilinga

    Beam Deflection Question

    I agree with rb1957. It will hardly take a few minutes to get the equation for the deflection at any point using double integration/McCaulay's method. equating the slope equation to zero, the location of max. deflection and thereby he max. deflection can be found.
  6. trilinga

    Moment connection by full penetration weld

    Will your architect allow to provide flange plates? If so, you can transfer the compression and tension from the flanges of the cantilever to the supporting beam on the other side by welding flange plates through the connection at the top and bottom. The web connection can be a shear connection...
  7. trilinga

    beam creep

    The two phenomena are explained through a spring-dashpot model with the spring and dashpot connected in series for one case and in parallel for the other.
  8. trilinga

    beam creep

    Rapt I am not clear about your statement 'Relaxation in prestressing steel is tensile creep'. Please correct me if I am wrong. From my basic knowledge of Material science, Creep and relaxation are two different phenomena. Creep is the continued deformation under sustained constant laoding and...
  9. trilinga

    Fixed and pinned

    BA is right. There is no fixed or pinned footing. The fixity is between the column and footing only. If the column is fixed to the footing, it transfers axial load and moment to the footing (along with any horizontal shear). If the column is pinned at the footing(which is normally done in steel...
  10. trilinga

    Design of V shaped RCC columns

    Thank you guys. JAE, Prior to starting this thread, I have almost concluded to your suggestion of doing the design by hand from first principles. You have reconfirmed it. I do not have the PCA software but I can try to get it. Ishvaag, I will also try to understand the method given in your...
  11. trilinga

    Design of V shaped RCC columns

    Thanks for the responses from all. I must apologise for not making my query precise. The building is a three storeyed structure octagonal in shape. The columns at the corners of the octagon receive beams from either side of the corner of the octagon. The columns are 12" wide 24" along the...
  12. trilinga

    Design of V shaped RCC columns

    it is an octogonal shaped building. The columns are V shaped in plan. Trilinga
  13. trilinga

    Design of V shaped RCC columns

    I am invoved in the design of an octogonal shaped RCC building. Is there a design procedure or a handbook to design V shaped RCC columns (with an included angle of 135 deg.)? Thanks for the help Trilinga
  14. trilinga

    DEFLECTIONS OF EQUIPMENT SUPPORTING ELEMENTS

    I have to support an equipment on a structural frame resting on a set of existing roof beams. The lateral deflection of the frame consists of two parts, viz. the lateral deflection of the frame and the additional lateral deflection due to the differential vertical deflections of the supporting...
  15. trilinga

    OPTION IN 'COUNTIF' COMMAND

    Thanks Joerd and ACtrafficengr. The tips were really helpful Trilinga
  16. trilinga

    OPTION IN 'COUNTIF' COMMAND

    I am not familier with writing of Macros in EXCEL. I have an Excel spreadsheet in which I have data of different categories identified through different colour fills in the respective cells. If I have to count the number of cells with a specific category, is there any option in countif command...
  17. trilinga

    Tie beam to pile caps

    It is a normal practice to tie the pile cap in the direction along which no lever arm is available to resist moments. In a pile cap with two piles, the moment in the plane containing the two piles is resited by the push-pull on the two piles. The other direction has no such capacity. The tie...
  18. trilinga

    Cantilevered Concrete Slab Design

    Reinforcing the tension zone is one critical aspect. The second is the availability of sufficient counterweight for balance. If the slab is not continuing to a reasonable length on the other side if the masonry wall, the shuttering for the slab (particularly the props) should not be stripped...
  19. trilinga

    force due to falling objects

    I find the equation can be made simpler by equating the energies. The energy of the falling object as it strikes the beam (at the centre to be conservative)is 'mgh'. Neglecting the losses due to impact (again to be conservative), this energy is stored as the strain energy in the beam while...
  20. trilinga

    HOW FAR IS IT RIGHT?

    Sorry for my delayed response. My PC was down for a few days. Thanks for the enthusiastic response of all. I infer from these posts that it is desirable to design the footing as pinned. Maybe, I need to revisit my concept of fixity for a footing. However, I think we should not forget the...

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