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smurphy
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| تاريخ الالتحاق: | الثلاثا مايو/أيار 9th, 2006 |
| الموقع: | ARCHITECT |
| عدد المواضيع: | 114 |
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كتب: الخميس يوليو 27th, 2006 10:47 pm |
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One of the folks in here mentioned that there are several questions on the exam about Link Beams... so after consulting ALS/Ballast/Graphic Standards/Wikopedia/etc.,. I came up with nothing... so I called up and emailed the goons  at NCARB who write these asinine questions and still no reply, so I asked the best darn structural engineers in Houston (at Bihner & Chen  ) and here's what they told me a LINK BEAM is:
A link beam is a beam (concrete, wood, or steel) that connects two different lateral elements such that they may act as one lateral element. For example, If there are two separate shear walls of different stiffnesses, then a link beam may be used to connect the two walls. The overall system would be stiffer than the individual elements, and thus cause less deflection.
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stnage
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| تاريخ الالتحاق: | الاثنين يوليو 3rd, 2006 |
| الموقع: | |
| عدد المواضيع: | 65 |
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كتب: الجمعة يوليو 28th, 2006 12:56 am |
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You mean " Drag Strut" ??
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orlo
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| تاريخ الالتحاق: | الاحد يونيو 5th, 2005 |
| الموقع: | 348 Powers Ave, USA |
| عدد المواضيع: | 447 |
| Exams Taken: | PD, GS, LF, ME, BD/MM, CD, SP, BP, BT | | Exams Passed: | PD, GS, LF, ME, BD/MM, CD, SP, BP, BT | | Describes Me: | |
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كتب: الجمعة يوليو 28th, 2006 02:21 am |
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http://nisee.berkeley.edu/lessons/arnold.html under Section I.
I. Shear Walls and Braced Frames (Figure 35) seems to indicate whats a link beam. Also in David T's seminar, he did mention this, and as far as I can remember it is as indicated on the reference above.
You can also check out this other site (see slide 13)
http://www.usc.edu/dept/architecture/mbs/struct/Arch613/lecture-prints/25-verical-structures.pdf
Orlando
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orlo
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| تاريخ الالتحاق: | الاحد يونيو 5th, 2005 |
| الموقع: | 348 Powers Ave, USA |
| عدد المواضيع: | 447 |
| Exams Taken: | PD, GS, LF, ME, BD/MM, CD, SP, BP, BT | | Exams Passed: | PD, GS, LF, ME, BD/MM, CD, SP, BP, BT | | Describes Me: | |
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كتب: الجمعة يوليو 28th, 2006 01:14 pm |
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This Question came up before. check the following post:
http://www.areforum.org/forums/view_topic.php?id=15586&forum_id=3&highlight=link+beam
Orlando
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stnage
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| تاريخ الالتحاق: | الاثنين يوليو 3rd, 2006 |
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| عدد المواضيع: | 65 |
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كتب: الاثنين يوليو 31st, 2006 02:26 pm |
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Link Beam question showed up in my Saturday Exam. Thanks for information..at least I got that question right.
So many WTF Questions and I will be ok If I fail.
I don't know where to start again if I fail.
Question was really long and I had a really hard calculation questions that I don't want to think about.
I will write down more when I am sane.
Thanks
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orlo
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| تاريخ الالتحاق: | الاحد يونيو 5th, 2005 |
| الموقع: | 348 Powers Ave, USA |
| عدد المواضيع: | 447 |
| Exams Taken: | PD, GS, LF, ME, BD/MM, CD, SP, BP, BT | | Exams Passed: | PD, GS, LF, ME, BD/MM, CD, SP, BP, BT | | Describes Me: | |
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كتب: الاثنين يوليو 31st, 2006 03:29 pm |
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Glad this could be of some help.
What surprises did you encounter? Is it much the same as what has been posted?
What's your summary?
Orlando
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stnage
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| تاريخ الالتحاق: | الاثنين يوليو 3rd, 2006 |
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كتب: الاثنين يوليو 31st, 2006 03:35 pm |
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I will do when I got more time.
Back to work now.
Generally, Calculation was harder than GS and A lot of unknown questions that deep in detail. Questions and examples are really long to read and improper English...hard to understand. Worst Ever..so far.
I will think some specifics later
Thanks
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smurphy
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| تاريخ الالتحاق: | الثلاثا مايو/أيار 9th, 2006 |
| الموقع: | ARCHITECT |
| عدد المواضيع: | 114 |
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كتب: الثلاثا أغسطس 1st, 2006 01:51 pm |
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| I just took LF yesterday and had the exact same experience... cryptic / nebulus / weird, I think I might have failed it... but come really close to passing. I passed GS the week before. sigh... time will tell.
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stnage
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| تاريخ الالتحاق: | الاثنين يوليو 3rd, 2006 |
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| عدد المواضيع: | 65 |
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كتب: الثلاثا أغسطس 1st, 2006 03:03 pm |
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I hope you pass it.
thing is I am not a native speaker( Been Here 7 years) and reading is not fast as you guys plus these WTF English questions.
It took so much energy out of me and I wish NCARB make it clear.
One weired experience was....while I was selecting one of exam answer (C) and answer automatically goes to D. So, I thought " WTF", should I tell staff here..??
then, I tried 3-4 times and whenever I select C, it goes to D.
I moved back and forth several times and I gave up.
Thing is correct answer( I found out yesterday) was D and it automatically select that...at least I was correct two including this one and Link Beam Question.
Any similar Experience?
I think this is a serious error in system.
Thanks
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KDawg
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| تاريخ الالتحاق: | الثلاثا يونيو 20th, 2006 |
| الموقع: | California USA |
| عدد المواضيع: | 202 |
| Exams Taken: | PD, GS, LF, ME, BD/MM, CD, SP, BP, BT | | Exams Passed: | PD, GS, LF, ME, BD/MM, CD, SP, BP, BT | | Describes Me: | Architect, LEED AP |
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كتب: الاربعا أبريل 4th, 2007 02:28 am |
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| Bump - For anyone who wants to know what a link beam is - I found this helpful.
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HP13
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| تاريخ الالتحاق: | الاثنين ديسمبر 17th, 2007 |
| الموقع: | |
| عدد المواضيع: | 540 |
| Exams Taken: | PD, GS, LF, ME, BD/MM, CD, SP, BP, BT | | Exams Passed: | PD, GS, LF, ME, BD/MM, CD, SP, BP, BT | | Describes Me: | ARCHITECT!! Yeah!! |
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كتب: الخميس ديسمبر 20th, 2007 10:08 pm |
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http://www.usc.edu/dept/architecture/mbs/struct/Arch613/lectures/25-verical-structures.pdf
Slide 39-41 have some [highlight= #ffff88]link [highlight= #88ffff]beam examples. The whole slide show is good, showing
the structural system of some existing high rises.
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mgilman
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| تاريخ الالتحاق: | الاربعا يناير 23rd, 2008 |
| الموقع: | ARCHITEC _, LEED AP, New York USA |
| عدد المواضيع: | 743 |
| Exams Taken: | PD, GS, LF, ME, BD/MM, CD, SP, BP, BT | | Exams Passed: | GS, LF, ME, BD/MM, CD, SP, BP, BT | | Describes Me: | Happy Happy! |
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كتب: الخميس أغسطس 7th, 2008 01:10 pm |
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orlo wrote:
http://www.usc.edu/dept/architecture/mbs/struct/Arch613/lecture-prints/25-verical-structures.pdf
Orlando
GREAT site for visualizing tall structures...thanks!
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mrdcon
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| تاريخ الالتحاق: | السبت نوفمبر 19th, 2005 |
| الموقع: | Pennsylvania USA |
| عدد المواضيع: | 388 |
| Exams Taken: | PD, GS, LF, ME, BD/MM, CD, SP, BP, BT | | Exams Passed: | PD, GS, ME, BD/MM, CD, SP, BP, BT | | Describes Me: | a r c h i t e c - |
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كتب: الاحد أغسطس 10th, 2008 02:45 am |
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| I thought a "link beam" was the portion of a beam that is between eccentric bracing....am I incorrect?
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happy camper
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| تاريخ الالتحاق: | الاثنين أبريل 7th, 2008 |
| الموقع: | People's Republic Of Cambridge, Massachusetts USA |
| عدد المواضيع: | 89 |
| Exams Taken: | PD, GS, LF, ME, BD/MM, CD, SP, BT | | Exams Passed: | GS, LF, ME, BD/MM, CD, SP, BT | | Describes Me: | wandering around ncarb land, collecting letters...a.r.c.h.i.t.e... |
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كتب: السبت سيبتمبر 27th, 2008 09:58 pm |
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The link beam is now covered in Kaplan LF guide.
Bump to the top!
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mango61
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| تاريخ الالتحاق: | السبت أغسطس 20th, 2005 |
| الموقع: | New York USA |
| عدد المواضيع: | 208 |
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كتب: الاثنين سيبتمبر 29th, 2008 07:11 pm |
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As per Fema chapter#4-5, a link beam is found in the eccentric portion of a braced
frame, and its purpose is to absorb aqnd crupple before the actual frame does.
Good Luck I go in on the 22nd, last one. But read chapters #4,5,and 8, I found it to be better reading than Kaplan.
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modulator
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| تاريخ الالتحاق: | الاثنين أغسطس 8th, 2005 |
| الموقع: | New Orleans, Louisiana USA |
| عدد المواضيع: | 35 |
| Exams Taken: | GS, LF, ME, BD/MM, CD, SP, BP, BT | | Exams Passed: | ME, BD/MM, CD, SP, BP, BT | | Describes Me: | |
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كتب: السبت نوفمبر 15th, 2008 05:06 pm |
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based on what I've read in thre Kaplan 07 guide, a link beam and drag strut are synonymous (?)
The portion of a beam b/t the diag. braces on an eccentric braced frame can be considered a link beam/drag strut if it's connected in such a way that it DOES NOT introduce bending moments in the beam, but transfers horiz. forces from one braced frame to the other (like a drag strut). The beam would have to be continuous or have moment connections b/t link beam and braced portion in order to develop bending stresses in beam--I'm not completely sure if it is considered a link beam/drag strut in this second scenario.
Anyone got insight on this?
اخر تعديل في السبت نوفمبر 15th, 2008 05:07 pm بواسطة modulator
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LSU
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| تاريخ الالتحاق: | الاربعا سيبتمبر 27th, 2006 |
| الموقع: | Washington, Louisiana USA |
| عدد المواضيع: | 95 |
| Exams Taken: | PD, GS, LF, ME, BD/MM, CD, SP, BP, BT | | Exams Passed: | PD, GS, LF, ME, BD/MM, CD, SP, BP, BT | | Describes Me: | |
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كتب: الاثنين نوفمبر 17th, 2008 03:14 pm |
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| if i'm remembering correctly, archiflash identifies a dragstrut as a collector element which transfers lateral forces to vertical elements...which would be a different function than a link beam
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betterlate
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| تاريخ الالتحاق: | الاربعا يوليو 30th, 2008 |
| الموقع: | |
| عدد المواضيع: | 108 |
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كتب: الثلاثا ديسمبر 9th, 2008 05:42 am |
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From what I've been reading...
link beam = wall plane
drag strut = diaphragm
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modulator
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| تاريخ الالتحاق: | الاثنين أغسطس 8th, 2005 |
| الموقع: | New Orleans, Louisiana USA |
| عدد المواضيع: | 35 |
| Exams Taken: | GS, LF, ME, BD/MM, CD, SP, BP, BT | | Exams Passed: | ME, BD/MM, CD, SP, BP, BT | | Describes Me: | |
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كتب: الثلاثا ديسمبر 9th, 2008 02:56 pm |
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| based on some FEMA readings, a link beam may also be used to connect two framed structures so they act together as one.
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brandonpass
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| تاريخ الالتحاق: | الثلاثا يناير 2nd, 2007 |
| الموقع: | Chicago |
| عدد المواضيع: | 61 |
| Exams Taken: | PD, GS, ME, BD/MM, CD | | Exams Passed: | PD, GS, ME, BD/MM, CD | | Describes Me: | statically indeterminate |
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كتب: الاثنين ديسمبر 22nd, 2008 06:11 pm |
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Link beam is the portion of the beam between connections in an eccentrically braced frame that induces ductility. it adds flexibility.
more rigid than moment resisting frame & less rigid than a concentric braced frame.
Drag strut is the element used to transfer lateral load to a vertical load bearing element for transfer of force to the foundation. example: a continuous beam that distributes the lateral force from one wing of a building with a re-entrant corner (plan irregularity P1) to the load bearing wall of the opposite.. it is a type of collector...
a sill plate or double top plate of a diaphragm IS a collector but NOT a drag strut.
FEMA chapters 4 & 5 has an excellent photo showing and pointing to this link beam condition along with a lot of other interesting building components not visualized in Ballast, Kaplan, etc
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manincellv
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| تاريخ الالتحاق: | الاثنين يوليو 7th, 2008 |
| الموقع: | Dystopian Future - LEED AP |
| عدد المواضيع: | 293 |
| Exams Taken: | PD, GS, LF, ME, BD/MM, CD, SP, BP, BT | | Exams Passed: | PD, GS, ME, BD/MM, CD, SP, BP, BT | | Describes Me: | There's no certainty – only opportunity. |
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كتب: الاثنين ديسمبر 22nd, 2008 07:15 pm |
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Drag strut, tie or collector all mean the same thing. They are all elements of a diaphragm PARALLEL to the applied load that collects and transfers diaphragm shear to the vertical resisting elements.
اخر تعديل في الاثنين ديسمبر 22nd, 2008 07:15 pm بواسطة manincellv
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danielle227
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| تاريخ الالتحاق: | الثلاثا ديسمبر 19th, 2006 |
| الموقع: | Brooklyn, New York USA |
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كتب: الثلاثا ديسمبر 23rd, 2008 05:02 pm |
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While I was reading FEMA 454 I found this, defining link beams. I tried uploading the figure but it didn't work. To see the picture of a link beam go to FEMA454 chapter 5 page 3.
Can be found at http://www.fema.gov/library/viewRecord.do?id=2418
"There are two general types of braced frame: conventional concentric and eccentric. In the concentric frame, the center lines of the bracing members meet the horizontal beam at a single point.
In the eccentric braced frame, the braces are deliberately designed to meet the beam some distance apart from one another: the short piece of beam between the ends of the braces is called a link beam. The purpose of the link beam is to provide ductility to the system: under heavy seismic forces, the link beam will distort and dissipate the energy of the earthquake in a controlled way, thus protecting the remainder of the structure (Figure 5-2).
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الوقت الحالي هو 10:44 pm | |
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