Mass Timber How To's
Mass Timber How To's
  • 84
  • 201 656
CLT Diaphragm Spline Connections and Chord Detailing
The American Wood Council's Special Design Provisions for Wind and Seismic (SDPWS) §4.5.4 Item 1 requires that diaphragm shear forces be transferred between adjoining CLT panels and between CLT panels and boundary elements through dowel-type fasteners in shear. Dowel-type fasteners include nails, wood screws, lag screws, and bolts. Dowel-type fasteners in shear are installed perpendicular to the shear plane and not used in tension (withdrawal) or compression to resist diaphragm shear. In practice, nails and proprietary self-tapping screws are mostly commonly used in CLT diaphragm connections. SDPWS §4.5.4 Item 2 does not permit the use of shear connections to transfer the diaphragm tension forces, such as at chords and collectors.
For diaphragm shear connections, the capacities of the dowel-type fasteners (nails and screws) in shear, Z, are calculated using the yield mode equations of the National Design Specification® (NDS®) for Wood Construction §12.3.1. Mode IIIs or Mode IV of this section is required to control the capacity of the diaphragm shear connections. The nominal diaphragm shear capacity of the connection is based on an adjusted design capacity, Z*, defined in SDPWS §4.5.4 Item 1. Z* is similar to the adjusted design capacity, Z′, in NDS Table 11.3.1 except the ASD and LRFD-specific adjustment factors, CD, KF, ϕ, and λ, are not applied.
Z* = Z x CM Ct Cg CΔ Ceg Cdi Ctn
The nominal shear capacity per fastener is:
Vn = 4.5 Z*
The chords, collectors and their connections, (y) and (z), and other structural components transferring shear, such as the CLT panels themselves, have different design requirements. The connections of chords and collectors are not required to use dowel-type fasteners in shear controlled by yield modes IIIs or IV. However, chords, collectors, and their connections must be designed to higher required capacity with a force increase factor applied to the diaphragm design force. The required force increase factors are found in SDPWS §4.5.4 Item 3, including Exceptions 1 and 2.
The capacities of these diaphragm components are calculated using the provisions of the applicable material design method. The design capacities of wood chords, collectors, and their connections are calculated using the NDS, and not using the SDPWS nominal capacity (4.5 Z*) and reduction factors.
The above is an excerpt from the WoodWorks CLT Diaphragm Design Guide. If you are working on a mass timber structural design, and have questions about diaphragm detailing, grab your free copy here 👉
www.woodworks.org/resources/clt-diaphragm-design-guide/
Переглядів: 803

Відео

Building Tall with Wood: Design Tips for Mass Timber High-Rises
Переглядів 1,1 тис.Рік тому
Ascent Milwaukee is currently the world's tallest mass timber building, standing 25 stories and 284 feet tall. The project includes 19 stories of mass timber residential units, with concrete cores, on top of 6 stories of concrete, primarily parking. This series of short videos provide key insights into the design and construction process. In this video, Jason Korb or Korb and Associates and Jor...
Fire and Structural Engineering for Mass Timber
Переглядів 1,5 тис.Рік тому
Resources discussed in this video: WoodWorks inventory of fire tested mass timber assemblies: www.woodworks.org/resources/inventory-of-fire-resistance-tested-mass-timber-assemblies-penetrations/ ANSI/APA PRG 320: www.apawood.org/ansi-apa-prg-320 Canadian CLT Handbook: web.fpinnovations.ca/clt/ AWC's FDS: awc.org/wp-content/uploads/2021/12/2022-FDS-FINAL-09.13.22.pdf AWC's TR-10: awc.org/wp-cont...
Eastern Hemlock CLT | World's First Use of this Mass Timber Product
Переглядів 5 тис.Рік тому
Eastern Hemlock CLT | World's First Use of this Mass Timber Product
Mass Timber in Affordable Housing: Does it Pencil?
Переглядів 2,1 тис.Рік тому
Mass Timber in Affordable Housing: Does it Pencil?
Visiting the World's Tallest Mass Timber Building
Переглядів 2,9 тис.Рік тому
Visiting the World's Tallest Mass Timber Building
Why Was Mass Timber Chosen for the World's Tallest? Ascent in Milwaukee
Переглядів 9882 роки тому
Why Was Mass Timber Chosen for the World's Tallest? Ascent in Milwaukee
Why Cover Timber with Gypsum Board? Fire Design Impacts
Переглядів 1,6 тис.2 роки тому
Why Cover Timber with Gypsum Board? Fire Design Impacts
#1 Tip for Success: Women of Mass Timber Engineering
Переглядів 3852 роки тому
#1 Tip for Success: Women of Mass Timber Engineering
Timber Beam to Column Connections: Building The World's Tallest Timber Building
Переглядів 2,9 тис.2 роки тому
Timber Beam to Column Connections: Building The World's Tallest Timber Building
Women of Mass Timber Engineering: Advice for Aspiring Engineers
Переглядів 4322 роки тому
Women of Mass Timber Engineering: Advice for Aspiring Engineers
World's Tallest Timber Tower: Beam, Column and CLT Specs
Переглядів 1,7 тис.2 роки тому
World's Tallest Timber Tower: Beam, Column and CLT Specs
Women of Mass Timber Engineering: How They Got Started
Переглядів 7632 роки тому
Women of Mass Timber Engineering: How They Got Started
BIG Changes for Tall Mass Timber Design!
Переглядів 2,4 тис.2 роки тому
BIG Changes for Tall Mass Timber Design!
Timber vs. Non-Timber: 8 Seismic and Wind Lateral System Options for a Mass Timber Building
Переглядів 2,3 тис.2 роки тому
Timber vs. Non-Timber: 8 Seismic and Wind Lateral System Options for a Mass Timber Building
Moisture Protection and Prefabricated Connections: Lessons Learned on Mass Timber at Bowdoin
Переглядів 1,8 тис.2 роки тому
Moisture Protection and Prefabricated Connections: Lessons Learned on Mass Timber at Bowdoin
$$ WHAT YOU SHOULD KNOW ABOUT MASS TIMBER COSTS $$
Переглядів 8 тис.2 роки тому
$$ WHAT YOU SHOULD KNOW ABOUT MASS TIMBER COSTS $$
Interior Partitions in Mass Timber Buildings: What Should They Be?
Переглядів 6 тис.2 роки тому
Interior Partitions in Mass Timber Buildings: What Should They Be?
Hybrid Mass Timber: Lessons Learned & Tips for Success
Переглядів 27 тис.2 роки тому
Hybrid Mass Timber: Lessons Learned & Tips for Success
Concealed Spaces in Mass Timber Buildings
Переглядів 1,6 тис.2 роки тому
Concealed Spaces in Mass Timber Buildings
How are Builder's Risk Insurance Programs for Mass Timber Structured?
Переглядів 5102 роки тому
How are Builder's Risk Insurance Programs for Mass Timber Structured?
Builder's Risk for Mass Timber: What Information Will Your Insurer Want to Know?
Переглядів 2982 роки тому
Builder's Risk for Mass Timber: What Information Will Your Insurer Want to Know?
How do Builder's Risk Insurers View Mass Timber Relative to Other Materials?
Переглядів 4762 роки тому
How do Builder's Risk Insurers View Mass Timber Relative to Other Materials?
How Can Mass Timber Reduce Your Building's Height?
Переглядів 1,7 тис.2 роки тому
How Can Mass Timber Reduce Your Building's Height?
Mass Timber + Structural Steel Hybrid Construction
Переглядів 3,5 тис.2 роки тому
Mass Timber Structural Steel Hybrid Construction
CLT Shearwall Design at Bowdoin College | Connections, Seismic Analysis and Details
Переглядів 2,1 тис.2 роки тому
CLT Shearwall Design at Bowdoin College | Connections, Seismic Analysis and Details
Vertical Column Movements in Tall Mass Timber Structures
Переглядів 2 тис.2 роки тому
Vertical Column Movements in Tall Mass Timber Structures
Mass Timber Vertical Addition on Existing Steel & Concrete Building in Washington DC
Переглядів 8242 роки тому
Mass Timber Vertical Addition on Existing Steel & Concrete Building in Washington DC
3D Building Models for Mass Timber | Constructing a Digital Twin
Переглядів 1,9 тис.2 роки тому
3D Building Models for Mass Timber | Constructing a Digital Twin
Tall Mass Timber | Type IV-B | 9 Stories | INTRO in Cleveland
Переглядів 5852 роки тому
Tall Mass Timber | Type IV-B | 9 Stories | INTRO in Cleveland

КОМЕНТАРІ

  • @arsenyunknown
    @arsenyunknown 3 години тому

    Maybe my english is bad, but i dont get how the reduced height of ceiling is extra protected from the fire. By concrete above? Seems strange to me. Does the fire fire goes down (from design criteria point of view) ?

  • @prjctcivilian
    @prjctcivilian 2 місяці тому

    Hey this seems to be true for smaller mass timber residential buildings (especially post n plate systems) but when we start looking at taller structures which require encapsulation or are supported by post and beam gravity systems doesn't this floor to ceiling height requirement start increasing? Also, with residential there is often a push to hide wiring and hvac.What are good solutons to reduce floor to ceiling heights when you start getting above 6 ST. I saw Ascent floor to ceiling heights were like 11+/- ft.

  • @williamstark6191
    @williamstark6191 3 місяці тому

    Probably a dumb questions; wouldn't adding concrete to a wood slab compromise the wood as it introduces moisture from the concrete into the wood? Like I said, probably a dumb questions, but I would think moisture would be the enemy of any mass timber structural unit.

  • @billsmith5109
    @billsmith5109 3 місяці тому

    Glass walled conference room, 1-hr wall. Use window sprinklers that are listed for this application. NB: There are a number of details that are required of both the glass and spk designer. In no case are intermediate horizontal mullions allowed. This appears to be biggest project risk. Someone tries to ‘be reasonable’ and save money. If you don’t know what you’re talking about, you aren’t being reasonable. You’re guessing. Project management will need to ride hard on this issue. You already have a wet spk system installed. Use it. Cheaper than rated glass.

  • @montypbbc
    @montypbbc 4 місяці тому

    Would NLT be a possible replacement in residential construction for a monolithic slab on grade? If the entire slab is inside the building envelope insulated underneath with the vapor barrier between the insulation and the NLT slab. Would there still be far too much expansion in the slab to make this suitable?

  • @johnmarkdaz1044
    @johnmarkdaz1044 4 місяці тому

    I’m currently conducting my architectural thesis on mass timber construction, and your videos have been incredibly helpful in guiding me through the structural aspects of my project. Thank you for that! If possible, could you recommend any books or materials that i can use my research? I would greatly appreciate it!

  • @gurbevanbelle
    @gurbevanbelle 4 місяці тому

    very nice - watching all yr vids tnx from the netherlands!

  • @armonwp
    @armonwp 5 місяців тому

    All good until it gets wet and blows up like MDF.

  • @MeticulousDA
    @MeticulousDA 5 місяців тому

    Thank you @MassTimberHowTos!

  • @scottmarriner2797
    @scottmarriner2797 6 місяців тому

    Hi if i was to make a bed frame what wood would be the cheapest? Can i use c16 treated 3x2 or can i use cls this is for frame only to fit 8x5 mattress with storage underneath it will be indoor which wood would best hold weight. Thanks

  • @R.E.A.L.I.T.Y
    @R.E.A.L.I.T.Y 6 місяців тому

    ÇA the 7th largest economy on earth builds this 1 tiny 50ish appts. Algeria built 500,000 appts 2021-2024 ua-cam.com/video/waaNWLMfUdw/v-deo.htmlsi=tRTOHMPTsnsMIksQ

  • @mesnijboon
    @mesnijboon 6 місяців тому

    Is the double beam system also an option when combined with concrete columns?

  • @joelthompson6201
    @joelthompson6201 7 місяців тому

    What is the purpose of the post fire multiplier?

  • @borabulut5722
    @borabulut5722 7 місяців тому

    great !

  • @creativespace3077
    @creativespace3077 9 місяців тому

    Excellent work and beautiful use of this natural product.

  • @officialsaucepan
    @officialsaucepan 10 місяців тому

    I wish my teachers would have shown me this channel at the beginning of my project instead of more than half way through

  • @ernstwolfaardt9385
    @ernstwolfaardt9385 10 місяців тому

    I am from South Africa, if you don't mind please send me your email address. I have a few questions on the design.

  • @daniel90340
    @daniel90340 10 місяців тому

    Little bit late to the party but what about combining the two concepts? Would it be possible to integrate a one-way spanning CLT panel between the glulam beams? Cant seem to find any references but dont know why, it seems to combine both the benefits of having a small construction height together with a large span. I can imagine using notched CLT for partially integrated floors or using a lot of screws or steel plates to suspend the CLT slab between the glulam beams.

  • @DavidElliottLewis
    @DavidElliottLewis 11 місяців тому

    Less talk and more show. Show us what it looks like.

  • @user-buildinghouseinkoreajeju

    ❤❤❤

  • @bryancomeaux4961
    @bryancomeaux4961 Рік тому

    I INVENTED THIS

  • @justcraziii
    @justcraziii Рік тому

    Longtime lurker, thanks for uploading these!

  • @That-Ninja
    @That-Ninja Рік тому

    I'm excited right now. I like going through turnstiles. 🦗

  • @buenobomb
    @buenobomb Рік тому

    Great content 🎉thank you for sharing

  • @carminesilverado
    @carminesilverado Рік тому

    the music is too loud and unnecessary

    • @MassTimberHowTos
      @MassTimberHowTos Рік тому

      Thanks for the feedback. Always looking for ways to improve.

  • @sokolmihajlovic1391
    @sokolmihajlovic1391 Рік тому

    Have not understood much. But still on point, no fuss, clean nice presentation. Great job.

  • @baxterenrife
    @baxterenrife Рік тому

    Scary eyes!

  • @jaykay-_-ok
    @jaykay-_-ok Рік тому

    Key insights: 🏗 Mass Timber's versatility allows it to act as the structure, expose architectural finish, and provide inherent fire resistance, making it a popular choice for construction projects. 🌳 Mass Timber is chosen for its aesthetics, speed of construction, and sustainability, making it a popular choice over other structural materials. 🏗 Using a hybrid approach of mass timber and another material creates complexity in procurement, coordination, and logistics, requiring careful planning and coordination. 🔥 Mass Timber's exposed finish and fire resistance rating make it unique but also requires additional care and protection on site. 🏢 Using a hybrid Mass Timber plus other materials can provide benefits in terms of span-to-depth ratios, making it a suitable solution for spanning long distances in office scenarios. 🏗 Understanding the differences in material tolerances and movements is critical when working with hybrid mass timber, as it requires creating details that accommodate the differential tolerance between materials. 🔥 On-site welding is often minimized or eliminated in structural steel and Mass Timber projects to avoid fire hazards and potential damage to the adjacent Mass Timber panels. 🌲 Woodwork is a free resource available to answer any questions about hybrid Mass Timber structural systems, providing support and guidance for projects in this field. TLDR: Hybrid mass timber structural systems offer a versatile and sustainable solution for construction projects, but careful planning and coordination are required to address the complexities and differences in material tolerances. 1. 00:00 🌲 Mass timber's versatility as both structure and finish, combined with other materials, can effectively enhance construction projects, but understanding its behaviour and interaction with other materials is crucial in determining its value compared to traditional options. 1.1 Mass Timber's versatility allows it to serve as both the structure and architectural finish, and when combined with other materials like steel and concrete, it can be effectively incorporated into construction projects. 1.2 Understanding how hybrid structures of mass timber and other building materials behave and interact is important in order to determine the value that mass timber can bring to projects compared to traditional materials like steel or concrete. 2. 02:09 🌲 Mass Timber offers benefits such as aesthetics, faster construction, sustainability, and suitability for sites with poor soils due to its warm look, time savings, lower weight, and environmental friendliness. 3. 02:42 🌲 Using a hybrid approach of mass timber and other materials in construction can reduce the need for soil remediation, but it also adds complexity in terms of procurement, coordination, and logistics. 4. 03:43 💡 Mass timber requires careful handling and protection from moisture due to its dual role as both a structural and exposed finish material. 5. 04:30 🌲 Using a hybrid Mass Timber system with other materials like structural steel beams and columns can provide benefits such as better span-to-depth ratios, allowing for longer distances and more creative options like fixed connections and cantilevers. 6. 05:43 🌲 Understanding the differences in material tolerances and movements is crucial when creating connections between structural building materials with tight tolerances and other materials, in order to accommodate differential tolerance and material movements on site. 7. 06:24 🌲 Mass Timber is not affected by moisture or temperature fluctuations, so it is important to understand and detail the connections between different materials to accommodate any potential differential movements. 8. 07:22 🌲 Having the same installer for both mass timber and other structural materials is beneficial for coordination and scheduling, maximizing installation speed, and reaching out to Woodworks for free resources. 8.1 Having the same installer for both the mass timber and other structural materials is beneficial for coordination and scheduling, as it allows for a synchronized and flawless installation process. 8.2 Maximize the installation speed of mass Timber construction by ensuring a seamless transition between materials, and if you have any questions, reach out to Woodworks for free resources.

  • @CuilcaghFK
    @CuilcaghFK Рік тому

    Chris Pratt’s brother 100%

  • @dustup2249
    @dustup2249 Рік тому

    Fascinating topic but your use of an imposing audio assault to the senses qualifies you for the s**tcan. I'll research this topic elsewhere.

  • @pikminlord343
    @pikminlord343 Рік тому

    Such good video

  • @Bshwag
    @Bshwag Рік тому

    i would really like to hear about mass timber for use in single family homes. Timber framed homes are competitively price from reduced labor on site costs. Does mass timber have the same advantage?

  • @Fefo419
    @Fefo419 Рік тому

    How tall is this ? In meters please. Thanks

  • @annegeorge6667
    @annegeorge6667 Рік тому

    What fire protection is used?.. how are the termites prevented?. What about when it rains

    • @MassTimberHowTos
      @MassTimberHowTos Рік тому

      Fire protection is via charring of the exposed glulam and CLT framing member, validated through testing: timberlab.com/projects/3hr#:~:text=RESULTS,alternative%20to%20concrete%20and%20steel. The concern for termites is significantly lessened based on location, as well as the fact that the lowest 6 floors of this building are concrete (primarily parking). During construction, the timber elements are exposed to weather. A thorough plan for moisture protection and mitigation is required to ensure that moisture staining and damage doesn't occur. See this document for best practices: www.rdh.com/wp-content/uploads/2022/11/Mass-Timber-Moisture-Management-Guide.pdf

    • @billsmith5109
      @billsmith5109 7 місяців тому

      @@MassTimberHowTosI think I’d correct that the charring considerations are looking at structural collapse or not. Fire protection for Heavy Timber, at least in the U.S., is fairly conventional and follows current code minimums. In North American new multi-family or commercial construction fire sprinklers are just like providing hot and cold running water. It’s assumed, the norm, so these folks fail to mention. Of course most fires are put out when tiny by occupants or controlled by one or two sprinkler heads, with final by FF’s. Are you interested in high rise or shorter buildings?

  • @natiarq7892
    @natiarq7892 Рік тому

    Can you put subtitles in spanish?

  • @natiarq7892
    @natiarq7892 Рік тому

    With this construction system always needs vigas/pilares or just can put the panels ? Lo que quiero preguntar es si para construir en este sistema varios niveles, siempre necesito poner vigas y pilares de madera + los paneles o puede sostenerse solo con los paneles? gracias 🤔

  • @amiriskandar4125
    @amiriskandar4125 Рік тому

    Good day, would you please recommend a textbook that is more technical? I am looking for a textbook that would help me understand the structural engineering side of things, how to design different elements, and how to design connections. Thank you

    • @MassTimberHowTos
      @MassTimberHowTos Рік тому

      Hello, in terms of a technical textbook I am not familiar with the options out there but if others reading this know of any, please feel free to chime in. We have a number of resources on the WoodWorks website related to the structural design of mass timber buildings. Here are some to get you started: www.woodworks.org/resources/clt-diaphragm-design-guide/ www.woodworks.org/resources/us-mass-timber-floor-vibration-design-guide/ www.woodworks.org/resources/creating-efficient-structural-grids-in-mass-timber-buildings/ www.structuremag.org/?p=10054

    • @amiriskandar4125
      @amiriskandar4125 Рік тому

      @@MassTimberHowTos Thank you very much

  • @alimuhammadgholizadeh4945

    Thanks❤

  • @TrungNguyen-yh6ei
    @TrungNguyen-yh6ei Рік тому

    What a great channel! This is the kind of content the algorithm should be promoting

    • @MassTimberHowTos
      @MassTimberHowTos Рік тому

      I appreciate that! Can't seem to crack that algorithm but still marching on! Any help spreading the word is appreciated.

  • @BisratHailemariam-u9o
    @BisratHailemariam-u9o Рік тому

    Hi there, can I ask, are the sources of water leakage in mass timber buildings different than other type of buildings, what make it different?

    • @MassTimberHowTos
      @MassTimberHowTos Рік тому

      In terms of water leakage through the exterior envelope, the challenges are really the same as other materials. In a mass timber building, often the exterior walls are not framed with mass timber. The roofs usually are. Some of the key points are to protect the timber from moisture as much as possible during transport and install, don't cover the timber with other materials until the timber has adequately dried, and then use well detailed and installed envelope systems. This document does a good job of explaining some of the common envelope details in a mass timber building: www.rdh.com/wp-content/uploads/2022/11/RDH-Mass-Timber-Design-Guide-V2.pdf

  • @MelaniaSideWigga
    @MelaniaSideWigga Рік тому

    Thank you for your Well-done & insightful videos. I will take issue with the opening statement which highlights 'doing more with less'. This kind of construction is wonderful, but when we start thinking of it (or anything else) as a way to 'do things on the cheap' (especially the less-skilled & sincere designers/builders), we start a slippery slope from Architecture & Structure into buildings that end up becoming exercises in slapping on veneers & appliques OK, I relinquish the Soap-Box.

  • @stanhalen247
    @stanhalen247 Рік тому

    Good metric.

  • @keelanhegarty
    @keelanhegarty Рік тому

    Thanks for the video. Couple of questions, 1) what are/where can I find the deflection limits in a fire condition? 2) can you explain why there is different charring rate in CLT for different lamination thicknesses? My understanding is that this is captured delamination of CLT panels but has since been resolved in PRG 320 2019 (and the types of adhesive permitted). Is the fact that NDS 2018 didn't have this resolved ... but may be captured in the next NDS revision?

    • @MassTimberHowTos
      @MassTimberHowTos Рік тому

      We haven't yet seen a guide on deflection limits in a fire conditions, I believe that would be an engineering judgement item. The variability of char rate with lamination thickness is based on the current NDS Chapter 16. You are correct that the PRG 320 now has new elevated temperature adhesive performance requirements. The char calculations in NDS remain unchanged for the time being

  • @MrKeithplowman
    @MrKeithplowman Рік тому

    Really helpful! Thanks. I'll be researching these topics.

  • @ClaireFrancesMusic
    @ClaireFrancesMusic Рік тому

    This is such an excellent summary thank you!

  • @MrKeithplowman
    @MrKeithplowman Рік тому

    Just discovered you, while doing some research into mass and engineered timber products. I've subscribed!

  • @erwindouwes7043
    @erwindouwes7043 Рік тому

    Big up, keep em coming

  • @tomasvigliani4221
    @tomasvigliani4221 Рік тому

    Thank you! Quick but very complete and detailed explanation of both systems. I just discovered mass timber construction and this was very helpful for me to understand it. Regards from Argentina.

  • @Nasty6280
    @Nasty6280 Рік тому

    That’s cool