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TUBULAR TRUSS

  • 1.  TUBULAR TRUSS

    Posted 02-17-2017 02:12 PM
    Hello every body,
    I live and work in Nepal and presently am involved in design and construction of industrial and storage buildings. I need help in designing tubular trusses spanning 100' to 150' wide buildings. The design should include wind loads with seismic considerations. If someone could suggest appropriate book on designing steel structures?

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    Peter Singh M.ASCE
    Managing Director
    Kingdom Designers
    Birganj
    9779855020043
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  • 2.  RE: TUBULAR TRUSS

    Posted 02-18-2017 01:38 AM
    Dear Sir,
    The Tubular truss design is somewhat similar to the rolled section design.usually we need to check their slenderness limits and need to compute actual stresses induced in these structure as per IS 800 2000
    we provide support through Design consultancy in such projects.
    we develop models, in staad, Sap 2000 etc for such structures.

    ------------------------------
    Chandrakant Pol A.M.ASCE
    Ass Professor
    Walchand College of engineering Sangli
    Peth Vadgaon MH
    918275286672
    ------------------------------



  • 3.  RE: TUBULAR TRUSS

    Posted 03-01-2017 09:35 AM
    Edited by Veronique Nguyen 03-01-2017 09:34 AM
    You can use steel design in the staad pro software...there you can had a number of member designs, with wind and seismic loading, you can apply different codes also in this software. In the design you can apply the tubular design to your designed structure.u can also estimate the quantity of steel required for the total structure. You can follow wind, seismic analysis from the manuals of staad pro software

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    Doredla Nagaraju S.M.ASCE
    student
    Giet
    Guntur District AP
    9191 8125461993
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  • 4.  RE: TUBULAR TRUSS

    Posted 02-18-2017 11:57 AM
    You mean that you want to design a truss made of tubes?  I think any basic software or even just basic Statics can tell you the forces in the members so you can size them.  To me the first thing you need to decide on is how you will connect the members.

    Do you intend the tubes to be coped so they are joined together by welding?  You will need to find a specialized fab shop that can do that and it will require welds that are hard to inspect.  The other, simpler, option is to simply cut a slot on the tubes and use plate connections.  Then you only have a simple fillet weld and plate to size.

    ------------------------------
    John Zachar Ph.D., P.E., M.ASCE
    Professor
    Milwaukee School of Eng
    Greendale WI
    (414) 421-0518
    ------------------------------



  • 5.  RE: TUBULAR TRUSS

    Posted 02-21-2017 09:42 AM
    SIr,
    Connections of the tubular structures are even more simpler than conventional gusset plate type connections.
    We generally avoid plate connections in these type of structures because due to plates extra weight is added to design and uneven stresses can be generated.So at the bearing areas only bearing plates are recommended.
    We connections   somewhat similar to the pipes caring liquid inside.  just like elbows, bends or even tees cross etc.the stresses are transferred through friction and slot welding.(depending upon stability of structure).at supports only bolting and bearing plates required to be designed.

    Any software or even manually(excel sheets)  such structures and their connection can be designed and fabricated.Specially experienced workmanship is not required for such projects if you will be providing threaded connections.As per drawing only you need to arrange the members and complete  the  structure.


    Chandrakant

    ------------------------------
    Chandrakant Pol A.M.ASCE
    Ass Professor
    Walchand College of engineering Sangli
    Sangli India
    91 8275286672
    ------------------------------



  • 6.  RE: TUBULAR TRUSS

    Posted 02-18-2017 11:58 AM
    Hi Peter,

    I would suggest the following:

    • Steel Designers Handbook; Gorenc B E, R 
    • Capacity Tables for Tubular Cold Formed Members; Australian Institute of Steel Construction
    What design wind speeds and Seismic Load factors are you designing

    Happy to assist further, as have been involved in Research programs reviewing design standards.

    Cheers,

     Dean.


    ------------------------------
    Munirud Dean CPEng, M.ASCE
    Student
    Chapel Hill
    614384 57732
    ------------------------------



  • 7.  RE: TUBULAR TRUSS

    Posted 02-18-2017 11:58 AM
    To

    Peter Singh M.ASCE
    Managing Director
    Kingdom Designers
    Birganj
    9779855020043

    Dear Sir,

    I am suggesting the following Bureau of Indian Standard SP :38(S&T) -1987 for practical preliminary and economical Design consideration and then verify by STAAD Pro software. I can assist in practical training both for how to utilize the  above hand book as well as STAAD Pro software training for the analysis and design of tubular truss either on site or at our place if requested. I am member of ASCE since 1988.

    In seismic prone area, I do not recommend more than 30m span.

    Although I have recently retired as Professor of Civil Engineering, I have also served as Structural Engineer also.

    With kind regards,
    Er (Prof.) P. Rajayogan FASCE
    My email id rajayoganp@... and mobile phone no is +91 94860 26085






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    Rajayogan Palanichamy P.E., CP, F.ASCE
    Professor Civil Engineering
    Virudhunagar, TN
    914562 243485
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  • 8.  RE: TUBULAR TRUSS

    Posted 02-18-2017 11:58 AM
    Good Evening,
    Tubular Truss is very Light Weight  Steel structure and Has no limits to its shape for roofing Designs.Tubular Truss has a lot of varieties of Connection Designs like Mero Node,Plate Connector,Unistruct etc.space frames consist of nodes and tubes interconnected to form
     
    three dimensional structural systems that afford a myriad of advantages to the other types of construction. Absolutely no limitations exist on what you could  use for; from the most elegantly simple to the most structurally challenging system.

    FInd the Attachment Concern to Books On Tubular Truss/Space Frame Structures

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    Syed Mohammed Alibaba C.Eng, Aff.M.ASCE
    STRUCTURAL ENGINEER
    Kurnool AP
    9191 9440445990
    ------------------------------



  • 9.  RE: TUBULAR TRUSS

    Posted 02-18-2017 11:59 AM

    Hello Mr Singh,


    The Book Optimum Design of Steel Structures By József Farkas, Károly Jármai might be the suitable one for your purpose. 

    Since the structural optimization has four main components: (1) design constraints, (2) fabrication constraints, (3) a cost function & (4) mathematical methods.In the book, authors have developed suitable means for these components of Optimization. The book starts with authors experiences in Optimization. Chapter 5 of this book is dedicated to the Design of Tubular Structures. 



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    Regards,
    Umer Farooq A.M.ASCE
    Asstt. Engrg Manager
    L&T Constructions Ltd.
    Faridabad
    ------------------------------



  • 10.  RE: TUBULAR TRUSS

    Posted 02-18-2017 03:12 PM
    Grettings,
    i don't know if in your country is valid the use of ASCE Minimum Design Loads for Buildings and Other Structures for seismic and wind parameters. Perhaps, your local codes must provides the seismic coefficients. 
    Also, the AISC Steel Construction Manual is an excellent references to use for designing steel tubular trusses.

    Regards,

    Victor E.





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    Victor Escalante-Cervera CP, A.M.ASCE
    Project Manager
    Epsa Labco, Ingenieros Consultores
    Santo Domingo
    8092213772
    ------------------------------



  • 11.  RE: TUBULAR TRUSS

    Posted 02-19-2017 11:44 AM
    Mr. Singh,

    It is very common in Industrial/warehouse buildings to use long span trusses or also called open Web joists. If I have to design this truss in USA, I will just use the following codes: 1. AISC-STEEL CONSTRUCTION MANUAL. 2. IBC 3. ASCE. You may not need any other text book, you can use any steel book. Doesn't matter what is the section type, you just use the standard procedure and calculate the forces in the truss and connection and then size your members and design connection. For analysis, you can use any software (SAP 2000, RISK 3D etc.) or can simplify your structure and use hand calculations to check and design critical member (tensing and compression). The very first step is to  set up your gollowing design criteria:
    1. Seismic load: based on site location and seismic coefficients and design earthquake, use ASCE and IBC
    2. Wind load: bad on site location, use IBC and ASCE.
    3. Live loads and dead loads.
    4. Snow load, if required by the design.

    Hope this helps.
    One more thing, pay special attention to connection design. Because most of the time it is the connection which fails, not the member itself.






    ------------------------------
    Amarjeet Saini, Ph.D., M. ASCE
    Structural Engineer
    New York, USA
    +001-4085041713
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  • 12.  RE: TUBULAR TRUSS

    Posted 02-19-2017 11:44 AM
    Use the AISC Steel Construction Manual and the AISC Seismic Design Manual. For connections refer to the
    AISC Design Guide 24. The Canadian Institute of Steel Construction probably has some good design manuals
    that are applicable to tube trusses.
    Consider changing to open web steel joists made up from angles. You can copy designs from manufacturer's
    catalogs available on the internet (e.g. Nucor). This what most engineers use in the United States and many other countries because they inexpensive.

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    John Broderick P.E., S.E., M.ASCE
    Struct Engr
    Chandler AZ
    (480)2630343
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  • 13.  RE: TUBULAR TRUSS

    Posted 02-21-2017 09:42 AM
    Hello Sir,

    I am a civil Engineer designer since 1995. therfore my humble suggestion to you will be to give this job to an engineer with the relevant expirience with such structures.
    Just for you to understand, these are the issues that you requiered to solve in to your design:
    1. Design the conceptual structure and declare the geometry of it. wheather you will design a 2D trusses, or maybe 3D trusses (which can reduce the amount of steel in such big structure to about 70%). Does the static system will drive moment to the foundations or the trusses will be connected through hinges, to reduce the moment at the foundation level to 0.
    2. Declering the wind loads on the scturcture. 
    3. Solving the static solution of the structure as a whole
    4. Solving the dynamic solution of the structure as a whole.
    5. Calculating the seismic loads 
    6. DEsigning the whole structure for dynamic loads (such as seismic). If an overhead crance will be installed, these load shal be take into considaration as well.
    7. impliment changes in the initial design due to the dynamic analysis.
    8. now, the real thing: start the design of the conections: both the static design and the dynamic design.

    as you can see, each of the above is a whole world that need to be built on expirience, and abook is not so recomended here.

    best regards,
    Ilan

    ------------------------------
    Ilan Azulay C.Eng, M.ASCE
    CEO
    I.y.Genesis Advanced Engineering Ltd.
    Matan

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  • 14.  RE: TUBULAR TRUSS

    Posted 02-21-2017 09:42 AM
    Are you using any computer software for the structural analysis? I'm still an undergrad student in Civil Engineering with concentrations in structural design and construction management. Though I have very limited real industry experience as a student, I have used RISA 3D in structural analysis, and I found it very helpful in my class. It has powerful functionality that can even provide suggested shapes for a particular design depending on the type of structure and the various forces acting on it. I didn't master the software, though, but I highly recommend it to structural engineers. Nevertheless there are many structural design and analysis software available. Learning how to use the software is a course on it's own. 

    If you already have a preliminary drawing of your truss, or a computer model, I think it will help if you can attach a drawing or a picture of it for someone to see whether they can help with suggestions. The ASCE Manuals, the AISC manual of Steel Construction, IBC and some textbooks will also serve as good reference materials throughout your design process.

    To save your project from costly mistakes, it will be a good idea for you to find a structural consultant to assist you. 

    ------------------------------
    Fallah Willie S.M.ASCE
    Norfolk VA
    (757)575-5260
    ------------------------------



  • 15.  RE: TUBULAR TRUSS

    Posted 02-21-2017 09:43 AM
    Dear Mr. Singh:

    AISC is the first place I would look for publications.

    Publications | American Institute of Steel Construction
    Aisc remove preview
    Publications | American Institute of Steel Construction
    AISC offers an extensive collection of documents and publications related to the design and construction of fabricated steel buildings and bridges. Many of our documents are free downloads to the general public, and thousands more are free downloads for AISC members. To access member benefits, you must be logged into the site.
    View this on Aisc >
    Good and cheap software:
    http://www.engineering-international.com/
    Good Luck

    ------------------------------
    Franklin Kapustka P.E., S.M.ASCE
    Student
    N/A
    Aloha OR
    (503) 268-1073
    ------------------------------



  • 16.  RE: TUBULAR TRUSS

    Posted 02-23-2017 04:09 PM
    Edited by Veronique Nguyen 02-23-2017 04:08 PM
    The Eads Bridge over the Mississippi River at St. Louis and the Firth of Forth Bridge in Scotland are tubular member bridges. A review of the literature about both of these long-standing bridges might produce some useful guidelines for you. Maintenance and repair histories would be pertinent as well as how the members are joined.

    The most prominent users of steel tubular member trusses in the world are the offshore oil and gas producers. The underwater jackets for bottom-founded marine platforms are almost exclusively trussworks of steel tubular member structures. The "Champagne" platform by Shell and the "Cervesa" platform by Union Oil of California, both in the Gulf of Mexico offshore Corpus Christi, probably still hold the water depth record (~1,000 to 1,200 feet) for bottom-founded platforms having jacket structures of steel tubular members. The offshore structural code of greatest prominence is API-RP-2A developed, published, maintained and available from the American Petroleum Institute Production Division in Dallas, Texas. I was a member of the RP-2A code Committee for over 10 years. When RP-2A was changed from ASD to LRFD in the mid-1980s I was appointed by the Committee and contracted by API to develop the minus two sigma probability-based limit state curves we needed using their extensive data base from funded research on tubular steel truss members. See "Tubular Member Strength Equations for LRFD", American Petroleum Institute Production Division, Dallas, Texas, API Project 86-55 Final Report, February 1987. 

    Please private message me should you have any questions about the report.
     

    ------------------------------
    John Cox, Life M.ASCE
    Structural Engineer
    Brighton CO
    (303)654-0454
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  • 17.  RE: TUBULAR TRUSS

    Posted 02-27-2017 09:32 AM
    If you have your mind set on tubular trusses, I may not be able to help you. However, I could design you some open webbed steel warren trusses to span those lengths. No problem.

    ------------------------------
    Peter Boothe A.M.ASCE
    Structural steel detailing checker
    Gainesville FL
    (352) 371-9448
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  • 18.  RE: TUBULAR TRUSS

    Posted 05-19-2017 10:56 AM
    Many have suggested good books based on the American code.

    If you are following the Indian code, you may follow my book Design of Steel Structures. Though it does not discuss tubular structures per se, though I have included some discussions and design of tubular columns.Design of Steel Structures
    Oup remove preview
    Design of Steel Structures
    Design of Steel Structures: Limit States Method is a comprehensive textbook designed to cater to the undergraduate students of civil and structural engineering. It will also prove useful for postgraduate students and serve as an invaluable reference for practising engineers unfamiliar with the limit state design of steel structures.
    View this on Oup >


    Someone mentioned about my Space Structures book too. The link to that is: Space Structures: Principles and Practice
    Multi-science remove preview
    Space Structures: Principles and Practice
    Space Structures are economical and aesthically pleasing in appearance. They provide a unique solution for covering large column free areas. This book gives a state of the art presentation of the analysis, design and construction of space structures. The author synthesizes data currently available with his original and exhaustive research to produce the definitive book on space structures.
    View this on Multi-science >


    All the best
    Subramanian



    ------------------------------
    Subramanian Narayanan Ph.D., P.E., F.ASCE
    Mentor, Consultant and Author
    Gaithersburg MD
    ------------------------------