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  1. li0ngalahad

    AS3600 cl 11.2.1 vs 11.7.3 - Two Layers fo reinforcement in walls

    Hi everyone I would like to bring to everyone's attention these two apparently contradictory clauses from AS3600. Clause 11.2.1 says Braced walls where in-plane horizontal forces, acting in conjunction with the axial forces, are such that where a horizontal cross-section of the wall [...] (b)...
  2. li0ngalahad

    AS3600 Boundary elements in moderately ductile shear walls

    Hi all, I had a discussion with a colleague about the requirements for boundary elements in limited and moderately ductile shear walls. According to the code, boundary elements are required wherever the peak stress in the wall exceeds 0.15 f'c. The debate revolves around which earthquake load...
  3. li0ngalahad

    AS3600 - Seismic design loads for foundations (...continue)

    Since the previous thread is now closed, I am opening a new one. There was a AS1170.4 seminar organised by CIA last week, held by Dr. John Wilson and Dr Scott Menegon. Very informative seminar in my opinion. Towards the end of Menegon's presentation there was specific mention on the design of...
  4. li0ngalahad

    AS3600 Column detailing contradiction

    It seems there's a contradiction between clauses in the concrete code regarding column detailing. Clause 10.7.4.3 (b) (iii) states, "where Lu < 5D, the spacing of the fitments shall not exceed the requirements of Section 14.5." Clause 14.4.3 indicates, "Any column in an Ordinary Moment...
  5. li0ngalahad

    AS4100 - Weld design for fabricated welded column

    Hi everyone, If we need to design a welded column, subject to axial load, how do we determine the design loads for the welds connecting the flanges to the web? I know for a beam that is subject to shear and bending moment, the weld is designed using the shear flow, f=VQ/I, and it's easy enough...
  6. li0ngalahad

    AS3600-2018 Seismic Detailing for columns

    Hi all Clause 14.5.4 of AS3600-2018 A2 says that At each end of the clear height of a column within a storey, the longitudinal reinforcement shall be restrained by closed fitments for a distance from the end equal to the greater of the maximum dimension of the column cross-section, or one...
  7. li0ngalahad

    AS3600 - Seismic design loads for foundations

    Hi, I have recently had a discussion with a colleague regarding seismic design of foundations. In his opinion foundations, like rafts supporting shear walls, should be designed with the same design loads as for the suprstructure, i.e. if I have a building with limited ductile shear walls...
  8. li0ngalahad

    Fire - Structural adequacy for flat slabs

    Clause 5.5.2 of AS3600-2018 specifies that - for solid slabs supported by walls or beams, the minimum thickness requirement is not applicable - for flat slabs, the minimum slab thickness must be as per table 5.5.2(A) "over a rectangular area extending 0.16 of the larger span length either side...
  9. li0ngalahad

    AS3600-2018 - Detailing for grouted ducts in precast walls

    Hi I am a bit puzzled about clause 17.7.5 on the AS3600-2019 code and I was wondering if anyone can shedsome light on it. 17.7.5 Grouted ducts to joints Grouted ducts used to join prefabricated elements shall be fully confined using Ductility Class N reinforcement anchored perpendicular to...
  10. li0ngalahad

    AS3600-2018 Shear reinforcement for pad footings

    Hi all I have noticed that the new concrete code has removed the clause that in the 2009 version allowed to waive the minimum shear reinforcement for elements deeper than 750mm if they were considered as slabs. In particular this allowed engineers to generally specify pad footings with no shear...
  11. li0ngalahad

    Longitudinal shear for encased composite beams

    Hi all I am trying to design steel-concrete encased composite beam, more precisely a cast-in plate (in green, see drawing attached) inside a concrete beam. This is mainly to increase the shear capacity of the beam (it's a linking beam in a liftcore). To make steel and concrete act together we...
  12. li0ngalahad

    AS3600 - Column restraints

    Hi It is not clear to me how to brace a slender concrete column or wall in order to reduce its height. Usually with steel column, a restraint is deemed to be satisfactory if the brace capacity is at least 2.5% of the ultimate compression load in the member to be braced. This applies to the...
  13. li0ngalahad

    wall-supported beam - moment transmission

    Hi guys, rookie here. I am trying to model a beam supported by a wall and a column without any moment transmission on the wall. Releasing the beam end doesn't work (I believe it works only between frame members, and walls are not such). It works only if I consider the supporting wall as a...

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