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  1. brTCP

    Calculating the weight span of an overhead power line catenary under wind loading

    I am having difficulties understanding the calculation of the weight span for spans subjected to wind loading in overhead power lines. Do I still have to consider the lowest point to define the weight span, or do I have to consider the lowest point of the catenary in the coordinate system of the...
  2. brTCP

    Grenoble method for pile uplift verifications

    Dear all, I came across a document mentioning the "Grenoble Method" for pile uplift verifications. I need to understand the method because we were asked to used it in one of our projects for guyed mast foundations. However, I found very limited information online, and a vague reference to an...
  3. brTCP

    Steel horizontal diaphragm at roof level of a Reinforced Concrete Building?

    Hi, I am designing a reinforced concrete building with a steel flat roof. From my calculations, it seems beneficial for this building to have a diaphragm at roof level, but here is the question: is it feasible to design a steel roof as a diaphragm? Usually, due to temperature or other factors, I...
  4. brTCP

    Eliminating some expansion joints to improve seismic performance?

    I am retrofitting an existing building that is composed of highly irregular independent blocks. If I merge some blocks together (eliminating some of the joints), the structure becomes quite regular in plan. The joints are spaced at roughly 30m. The question is, what should I have in mind while...
  5. brTCP

    Seismic upgrading of a highly irregular, partially buried, existing reinforced concrete building

    I am trying to retrofit an existing 4 story reinforced concrete building with a typical plan as shown below. The thing is, it has a very long wall on one side, retaining the soil behind, and a very flexible structure over the rest of the floor plan. When I tried to balance the stiffness of the...
  6. brTCP

    Post installed connection on concrete with variable width

    Would you design the connection below assuming the concrete member width is b1, b2, b3 or something else (see figure below for explanation)? I couldn't find a direct reference in the codes about this situation. I am assuming b1 is overly conservative, considering that the concrete cones can...
  7. brTCP

    Short circuit forces used for structural design of the gantry structure

    Dear all, I am a structural engineer, and the electrical engineer gave me the short circuit forces to be applied to the gantry structure. The trouble is that I can't seem to find any reference in the European norms about the consideration of these loads for my strucutral design. Do I consider...
  8. brTCP

    Apps for base plate design, including cast in place anchors according to the Eurocodes

    Hi, what apps do you use to design base plates for steel structures? Is there something you recommend? Any free tool available? I have been using several, but I find all of them limited to some extend. For instance: 1) Autodesk Robot Structural Analysis: I cannot specify additional...
  9. brTCP

    Do purlins not attached to bracing reduce the critical length of the top chord of a truss?

    The literature seems unclear on this one. In the picture below, every other purlin is attached to the bracing system. Do I consider the top chord critical length 2L in this case or 1L (L being the distance between two nodes)?
  10. brTCP

    Resources and ideas for the design of non-conventional steel-concrete connections

    Hi, Do you know any good apps, books and papers dealing with the design of nonconventional steel to concrete connections? By "non conventional" I mean connections that are not currently handled by programs such as Hilti Profis Engineering or Peikko Designer. Two examples I face very commonly...
  11. brTCP

    Can a layered nonlinear shell model capture shear failure of a reinforced concrete element?

    I am trying to model a reinforced concrete wall in Sap2000 with nonlinear layered shells. I know for a fact that the behavior of this wall is governed by shear, because it failed during a recent earthquake and the failure mode is clearly a shear failure. Is the nonlinear layered shell model...
  12. brTCP

    Question about wind loading on open canopy attached to a building.

    I have a horizontal canopy attached to a building, as shown in the figure below. The canopy does not have any cladding except for some timber joists. The idea of this canopy is to create some shadow, nothing more. The solid area divided by the total area of the canopy is about 0.4 (taking into...
  13. brTCP

    Steel cantilever connected to concrete slab: combining bolts in shear with concrete in compression

    Hi, due to the limited space, I often find myself wondering whether I could use bolts in shear (bolts 1 in the figure) in conjunction with concrete in compression (perhaps with bolts no. 2 to hold the shear force). In these cases, I find it hard to find the forces in the bolts with confidence...
  14. brTCP

    Wind loading of members of steel lattice towers - the correct interpretation of EN 50341?

    How do you understand the following provision in EN 50341-1 (2012) regarding wind loading applied to members of a lattice tower? Does it mean that the following figure is correct? Consider the wind blowing along the X-axis. Any thoughts on this?
  15. brTCP

    Cable support reactions (or cable tension) given a "ruling span", "wind span" an

    Is it possible to calculate the cable support reactions (or the cable tension) given only: - the weight of the cable per unit length; - the ruling span; - the wind span; - the weight span? My understanding is that there is an infinite number of solutions for this problem depending on the...

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