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  1. NedGan76

    Precast Double T-Beam Cracking Question

    IMHO, these cracks indicate structural shear issue and they are too large to be neglected. Seems as if more vertical stirrups are required at the end of the higher section.
  2. NedGan76

    Open source engineering programs

    Hi! Since most of the programs are for structural calculations, I am sharing that here. https://www.eng-tips.com/viewthread.cfm?qid=523051 Cheers! Ned Ganchovski A better software for your calculation notes, free and open source: https://github.com/Proektsoftbg/Calcpad
  3. NedGan76

    Vector and matrix calculations in Calcpad

    Hello guys! I am happy to announce that a new version of Calcpad VM 7.0 is available with vector and matrix calculations: https://github.com/Proektsoftbg/Calcpad/releases/tag/v7.0.7 It is open source and completely free for eveyone. With almost no programming skills, you can create engineering...
  4. NedGan76

    Preloaded bolt

    rb1957 Sorry, but this is exactly the kind of discussion, I tried to avoid by setting E = infinity. Let's keep the things as simple. :) Cheers! Ned Ganchovski A better software for your calculation notes, free and open source: https://github.com/Proektsoftbg/Calcpad
  5. NedGan76

    Preloaded bolt

    rb1957, Yes, these problems are common for prestressed reinforcement. But this would also apply to our problem, if the block was concrete. It was just an example that the material does matter and specifying Е = infinity can simplify the problem. In practice, we can have preloaded anchor bolts...
  6. NedGan76

    Preloaded bolt

    BAretired From my experience, some people tend to make the things much more complicated than necessary. So, by introducing this premise, I avoid turning this otherwise simple problem into a postdoc research. :))) For example, imagine that the block is concrete C15/20. We may loose prestress...
  7. NedGan76

    Preloaded bolt

    It is a good question. What is your opinion about that? Cheers! Ned Ganchovski A better software for your calculation notes, free and open source: https://github.com/Proektsoftbg/Calcpad
  8. NedGan76

    Preloaded bolt

    Howdy! This is another tricky problem to check your knowledge and common engineering sense;) Given a steel bolt in an infinitely stiff package. First, we tighten the nut until we prestress the bolt with a force P. Then, we pull the bolt with a force F. What is the final axial force inside the...
  9. NedGan76

    How to Calculate Punching Shear of a Hollow Concrete Column on a Reinforced Concrete Slab?

    I do not know what dimensions do you have in your case. It would be much easier if you post some picture of your structure. I am not sure this applies only for thin plates. What do you mean with "That would only apply for a very large diameter hollow section with a small thickness slab...
  10. NedGan76

    How to Calculate Punching Shear of a Hollow Concrete Column on a Reinforced Concrete Slab?

    @drucurl. I am pretty confident that you cannot take the inner perimeter. But I see your point. What you can legally do is to take out the UDL that acts on the area enclosed by the punching perimeter and reduce the total punching force. As one can notice, this load does not contribute to the...
  11. NedGan76

    How to Calculate Punching Shear of a Hollow Concrete Column on a Reinforced Concrete Slab?

    Even if the section is hollow, you have to consider only the outer perimeter as for a solid section. If it fails, the column will punch through the slab anyway. Cheers! Ned Ganchovski A better software for your calculation notes, free and open source: https://github.com/Proektsoftbg/Calcpad
  12. NedGan76

    A funny statics problem

    GeorgeTheCivilEngineer. No, there are two horizontal supports and one vertical. The top middle support provides restraint in two directions: X and Y. Yes, it is pinned. Sorry, lost in translation. Actually, this is very basic stuff. I am a little surprised that we have to discuss that here. :)...
  13. NedGan76

    A funny statics problem

    Retrograde. I would even more kindly disagree with this either. There are three types of structures: 1. kinematic; 2. statically determinate; 3. statically indeterminate. This structure above is definitely "2. statically determinate" and it is stable. A body has three DOF's in the plane - 2...
  14. NedGan76

    Modal Mass Participation Ratio

    What software do you use? Consider adding rigid floor diaphragms, if possible, and concentrating the masses (and mass moments of inertia) in the respective mass centers. It is also quite possible that your building does not have sufficient torsional stiffness or large eccentricities, so...
  15. NedGan76

    A funny statics problem

    BAretired, this is a good approach to compare the three cases. Tomfh, this is a good explanation. Without the roller support at bottom left, the system is in an unstable balance. An infinitely small force is needed to rotate the structure about the fixed support. BridgeSmith: "In a statics...
  16. NedGan76

    A funny statics problem

    This problem is interesting and funny because the solution is the opposite to what our intuition says. And here is the solution: First, find the support reactions: For the vertical support in the middle - from ∑V = 0 => V_t = 2F For the horizontal support at bottom left support - from ∑M = 0...
  17. NedGan76

    A funny statics problem

    FEA Way, you are not playing fair. Said no computers allowed. ;) But the question still remains: why is this happening like that? Cheers! Ned Ganchovski A better software for your calculation notes, free and open source: https://github.com/Proektsoftbg/Calcpad
  18. NedGan76

    A funny statics problem

    There is no restraint at the right hand column.
  19. NedGan76

    A funny statics problem

    Hi, everyone! Here is an interesting and funny statics problem, to exercise engineering brains and cheer up. Given the following structure can you tell, without calculating, in which direction point A will move after deformation: A) up B) down C) will not move ... and why? Point A is not a...
  20. NedGan76

    SMath studio no longer free for commercial use

    Calcpad will always be free for both commercial and non-commercial use. It is open-source and everyone can download the source code from GitHub and build it by himself: https://github.com/Proektsoftbg/Calcpad It will continue to improve further and new features will be added. Actually, the...

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