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  1. blihp

    Coupling of columns thru slabs

    hi i have a building where i have a couple of columns relatively close to another and am finding that they are attracting axial loads under a lateral load only case (ie no gravity or live loads). The columns are pinned and thus it cant be frame action (and the results show they are carrying...
  2. blihp

    Why Shear studs welded onto the Lysaght bondek ?

    Bondek is a australian 'wrinkly tin' / metal deck that can be used to provide composite action ie the same as holorib / ribdeck etc. i suspect the query about it being welded to the bondek is because if one looks down on to the metal decking (bondek) from above, all you may see is the shear...
  3. blihp

    UBC & ACI - Reg

    obviously CSI are the best placed to comment on how industry use their package, and i do not wish to sound contradictory to their advice. i have only previously reduced the bending stiffness of shear walls, ie M1, M2 and torsion, and not played with the axial stiffness, but this has been for...
  4. blihp

    UBC & ACI - Reg

    i have been reading this thread and its earlier discussion (thread726-151169) and thought i may chip in.. i think a key criteria is that you need to use different properties and stiffness's for different analyis and thus i often have atleast 2 models at any one time, an ultimate model and a...
  5. blihp

    comfort criteria for buildings

    i have previously posted this under the moment frame and shear wall thread but got no responses... so try again! :-) i am starting on the design of a number of tall buildings, ranging in heights from 25-50 storeys and am aware that i need to design the stability systems to ensure that...
  6. blihp

    Shearwall Modeling

    without knowing the geometry this is difficult to answer, but are the walls with the equal & opposite reactions resolving a torsion induced from eccentricity between the point of load application and the centre of stiffness?
  7. blihp

    Vibration Analysis

    i generally agree with the notion that RC slabs in most situations generally are not prone to vibration from 'normal human activity' due to their relatively heavy mass giving good inherent damping, however there are situations when this DOES need to be checked, such as when there is sensitive...
  8. blihp

    Why specify 3,000 lb concrete but only require 2,500 lb

    ps for clarity i should add to my previous post that im not involved in concrete supply at all! (im actually a structural engineer consultant...)
  9. blihp

    Why specify 3,000 lb concrete but only require 2,500 lb

    as well described already, the specifying of concrete needs to take into account not only the strength requirements, but also the durability and construction requirements. Many, if not most concrete repairs are due to either poor onsite workmanship such as insufficient cover to reinforcement...
  10. blihp

    Comfort Accelerations limits for Tall Building

    i am starting on the design of a number of tall buildings, ranging in heights from 25-50 storeys and am aware that i need to design the stability systems to ensure that accelerations from wind are kept to allowable limits. I have a few questions on this: 1/ where can i find some stated...

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