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  1. m_struct

    Strengthening Floor Joist

    We are looking at some existing 120-year-old floor joist that are “over span” and have a dead load sag of about 2”, which is 2 to 3 times current code deflection limits. For strengthening, we have suggested sistering on LVL to the existing joist. However only 70% of one side of the joist span...
  2. m_struct

    Floor joist to Non-Load Bearing Shear wall

    As part of the residential renovation, we are adding a second level to a single-story house. The house is timber framed with timber subfloor framing on pile timber piles and perimeter ring foundation. The contractor has requested the new level be support by steel beams and posts, like a...
  3. m_struct

    Nailer || Fixing to WF and min thickness

    For a residential job, architectural constrains are minimizing the nailer thickness on top of W10 gravity beam. Wood roof framing face mounted to blocking in web of W10. The roof ply fixes to the nailer, so any fixings would need to be recessed. What is the thinnest that the nailer could...
  4. m_struct

    Assessment of crane rail system - fatigue

    A client has a 25 year steel portal frame warehouse with an existing crane rails and an existing 3 ton gantry crane in use. He would like to add two more 3 ton gantry cranes and says that is what the building use to have. That was a couple owners ago. The warehouse is approximately 32m...
  5. m_struct

    Scissor Truss Concealed Connections

    A client has decided against the external plate connection for a timber scissor truss and has requested concealed connection for the 90mm (3.5”) wide members. What type of concealed connections are typically used for these truss? I was considering about plate connections for the top three...
  6. m_struct

    Stone Veneer Cladding

    A client would like 6in stone veneer cladding on a new story wood framed high-end residential job. Is there is rule-of-thumb for how tall stone veneer can be stacked before a self angle is required for support? Note that stone veneer is supported laterally by extra heavy ties at 16" centers...
  7. m_struct

    Shipping Container swimming pool

    A client asked about using three 20 ft long shipping containers to create a 5 ft by 60 ft long above ground outdoor lap pool. His plan is to cut off the top and some ends of the container. At the joint of the modified containers, the panels of the containers would be welded together (or...
  8. m_struct

    Tablets for sketching and mark ups

    I am looking for a tablet to use mainly for mark ups and sketching concept designs for clients during meetings. It would also be used for site visits and maybe calculation packages. It would not be replacing the engineering's main computer but supplementing it. I have used iPads in the past...
  9. m_struct

    Strap braced roof diaphragms

    For residential timber construction, what is there a practical limit for the span limit and span/depth limit of steel strap roof diaphragm, before considering plywood roof diaphragm? For example GIB ceiling diaphragms are limited to 12m with a 2:1 span to depth limit.
  10. m_struct

    Timber framed residential garage floor

    Looking for recommendations on timber framed floors in a residential garage - ie design for high point load. What floor systems is typically used? 1.5 inch decking? Is there a rule of thumb on the joist spacing? Note that cost efficiency is important here.
  11. m_struct

    1170.2 Internal Pressure

    Looking for clarification on using Table 5.1(A) and 5.1(B) for the internal pressure coefficient. For table 5.1(A), it states "walls without openings greater than 0.5% of the wall area and impermeable roof". - Does this mean a single opening or sum of the openings? - Does wall area equal...
  12. m_struct

    Concealed hinge connectors for wood

    For wood beams, these HCA hinge connectors are great being able to take advantage of the efficiencies that continuous members. These are great for industrial style buildings. For more higher spec building, the architect generally wants these concealed. Are there such connecters on the market...
  13. m_struct

    1170.3 Snow Actions - Obstructed Sloping Roofs

    Looking at a two level residential building with a 45 roof. The client would to open up the building with the house by raising sloped roof to approximately 20 degree. As the snow will now be obstructed, per figure 7.2 1170.3, it appears the existing truss would be exposed to a...
  14. m_struct

    Bolted Partial Moment Connection - PFC to Tube Section

    I am looking for any guidance on bolted beam column connection for channel to tube steel post. The moment frame supporting the front end of a deck. The tube steel posts are fixed base with a post hole foundations. For constructability the beam column joint is bolted and the design only...
  15. m_struct

    Sizing CLT walls at concept design

    Looking for a rule of thumb or quick design checks for laying out and sizing CLT bracing walls at concept design. Maybe something like - "limit V* to ____ per linear __"
  16. m_struct

    AS/NZS 1170.2 - Lee Zone for NZ

    Is looking at holiday home in Castle Hill and trying to determine if it is the lee zone. Figure 3.1(B) shows a wind regions map for NZ. It has the LEE ZONE regions shown on it. That map is lacking detail. Is there a google overlay of this map? The BRANZ Wind Zone map shows it in LEE ZONE...
  17. m_struct

    Vibration check for timber floor

    When checking a timber floor for vibrations, 1170.0 Table C.1 suggests 1kN point load at midspan with deflection less than 1 to 2mm. For a timber floor, with say 20mm strandfloor on 240x45 @ 400 spanning 4m, how much load sharing would be reasonable? It is there a rule of thumb for this...
  18. m_struct

    Timber cavity battens

    What loads are timber cavity battens on the exterior wall of a single family residential building designed for? Refer below. Note there are no blocking in the wall. Wind Seismic Dead Live What live load (if any) would is the batten designed for? Ladder leaning against the wall? Like a...
  19. m_struct

    Hot Tub on Exterior Deck at Height & Self Supported

    A client would like to extend his exterior deck to support a 2000kg hot tub (4.4 kips). The new deck steps down from the existing and approximately 4m x 5m in plan, 2.5 m (9 ft) above ground and on sloping site. Is there any guidance for loading, corrosion, and safety for hot tubs on exterior...
  20. m_struct

    Aluminium facade fixing to buidling

    Hi. Looking at the fixing of an 2mm aluminium cladding system to face of a building. The system is understood to have the detailing to allow for expansion and contraction of the panel. My engagement was specifying the fixing of the brackets to the wall. However, in one zone, the wood framed...

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