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  1. breaking_point

    Damped Natural Frequency

    Hey, I've always been curious as to how the damped natural frequency is derived: ωd = ωn sqrt(1−ξ^2) Does anyone have any literature? Is it empirical based on experiments? Thanks
  2. breaking_point

    RC Slab

    When designing a RC slab, it is typical to spec the same reinforcement top and bottom. When analyzing this section, do you assume the concrete contributes nothing (i.e. a neutral axis of 0) when analyzing the stress blocks as the compression steel would balance the tension steel? As such, the...
  3. breaking_point

    Timber Beam in Torsion

    Hey. I have attached an image of my query. I have timber beams that support decking that is tied into the beams using lag screws that provide lateral restraint. Attached to the left support beam is a post at approx 1m c/c along the length of the beam. The design code requires me to check...
  4. breaking_point

    ULS design question

    Hey everyone. I have a question regarding ultimate limit state design. Using this method, we calculate member capacities based on their maximum plastic capacities. We then select member parameters based on the factored loads and materials, so that the materials do not reach failure during their...
  5. breaking_point

    Maximum allowable reinforcement strain

    Hey. So I'm looking at RC beam design, and I'm aware that beams are typically designed to be tension controlled, i.e. at the concrete rupture strain (0.0035), the steel should be beyond the yield strain. I've read that it is good to aim to have the steel strain at around 0.005-0.008 when the...
  6. breaking_point

    Reinforced concrete beam - question about theory

    Hi, If I choose to design a reinforced concrete beam as simply supported (generally conservative), but it is in reality connected to a column in a more rigid connection, do I need to theoretically need to provide reinforcement on the top side of the beam? I know that the beam will want to go...
  7. breaking_point

    Confirmation about failure theories and Von Mises

    I've been learning about failure theories of materials, namely the Von Mises and Tresca theories. I read that these theories are used because the accuracy of just comparing the yield stress to the maximum yield for a uni-axial test in insufficient in more complex stress states. One thing I did...

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