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Jon Ellison Wrote:
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> Dr. Troglodyte Wrote:
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> -----
> > Jon Ellison Wrote:
> >
> --------------------------------------------------
>
> > -----
> > > Dr. Troglodyte Wrote:
> > >
> >
> --------------------------------------------------
>
> >
> > > -----
> > > >
> > >
> >
>

> >
> >
[Image Restored]

> > > >
> > > >
> > > > Hello Jon Ellison; regarding the above
> image
> > > you
> > > > wrote:
> > > >
> > > > ”Not really as it isn't an arch.
> > > > It's a triangulated, opposed truss.
> > > > It functions dynamically in exactly the
> same
> > > way
> > > > as the trusses' in the other
> > pyramids...”

> > > >
> > > > These comments are incorrect.
> > > >
> > > > The roof structure for this space is an
> > > > arch
. It is composed of segments of
> > > opposing
> > > > voussoirs. It is not a
> > > > “triangulated, opposed truss”; in that
> it
> > > does
> > > > satisfy the formulaic requirements for a
> > truss:
> > > > m = 2n – 3,
> >
> > > > where m is
> > the
> > > > total number of members and
> > > > n is the
> > total
> > > > number of nodes. It does not function
> > > > “dynamically” as a truss, for the same
> > > > reason.
> > > >
> > > >
> > > >
> > >
> >
>

> > > >
> > > >
> > > >
> > > > Dr. Troglodyte
> > >
> >
> > > How exactly does a Voussoir function as an
> > active
> > > component within a true arch????
> > > How does a true arch function as opposed to a
> > > gabled arch???
> > > Are they the same?
> > > Are they different??
> >
> >
> > The ‘voussoir’ is a wedge shaped
> > element utilized in load [force/thrust]
> > transference. In the image below, lines of
> > “thrust” are dashed:
> >
> >
> >
>

> >
> Source
> >
> >
> > > What is the difference between a True Arch
> and
> > a
> > > False Arch??
> >
> >
> > The ‘voussoired’ arch is a form of
> > “true” arch; the ‘corbeled’ arch is
> >
> defined as a “false” arch.
> >
> >
> > > What would happen if we were to remove the
> > lower
> > > cross member from a triangulated truss??
> > > If the lower cross member of a truss were
> > removed
> > > could it be compensated for in any other way
> > > therefore mathematically maintaining the
> > > structural integrity of the truss??
> > >
> >
> >
> > You would no longer have a ”truss”.
> > Compensation of the horizontal chord member of
> a
> > truss, that does not act in tension, negates
> its
> > designation as a ”truss”.
> >
> >
> > > I look forward to your answers.
> > >
> > > I have corrected and completed your drawing.
> > >
> > >
> >
> >
> >
> > You have “corrected” nothing. You have
> > illustrated the compression of the diagonal
> > members and the tension of the horizontal chord
> > member. You have incorrectly illustrated the
> > “reaction” force from the bearing nodes, as
> > indicated in this modern wood truss image:
>
> Yes I have corrected your incorrect drawing..
> What exactly is your "reaction force" reacting
> to???
>


‘Load’; for “Reaction Force”, refer Newton’s Third Law.


> Are you misreading your drawing??
>


No, but you may be.


> Or is it a drawing of a closed roof truss as
> opposed to what were talking about, which is an
> 'open truss' of the opposing variety? Sometimes
> referred to on here as "gables, rafters or
> chevrons".
>
>


There is no “open truss” in the context you are employing. In wood, metal, and similar materials*, a ‘tension’ member may be satisfied via the substitution of an arch or scissor (or similar, of like materials*), but not stone, which is only functional in ‘compression’. The terms "gables, rafters or chevrons", as discussed in most circumstances on the Boards, are examples of ’triangular arches’.



Dr. Troglodyte


>
> >
> >
> >
>

> >
> Source
> >
> >
> >
> > Dr. Troglodyte


“Quis custodiet ipsos custodes?“ - Decimus Junius Juvenalis


“Numero, Pondere et Mensura“


Options: ReplyQuote


Subject Views Written By Posted
Mastaba of Shepsekaf 1424 Thanos5150 25-Oct-17 04:25
Quite the Mastaba...looks like walls can talk ;) 274 Racho 25-Oct-17 06:11
Re: Quite the Mastaba...looks like walls can talk ;) 208 Thanos5150 26-Oct-17 02:26
Why adapted/adopted 191 Racho 31-Oct-17 07:44
Re: Why adapted/adopted 312 Jon Ellison 31-Oct-17 09:25
Re: Quite the Mastaba...looks like walls can talk ;) 227 Barbelo 26-Oct-17 03:57
Gables v Arch 166 Barbelo 26-Oct-17 03:47
Re: Gables v Arch 194 Thanos5150 26-Oct-17 04:47
Re: Gables v Arch 182 Barbelo 26-Oct-17 05:12
Re: Gables v Arch 164 Thanos5150 26-Oct-17 05:39
Re: Gables v Arch 231 Barbelo 26-Oct-17 06:49
An Interesting Curve 197 Jon Ellison 26-Oct-17 23:20
Re: Gables v Arch 159 Thanos5150 27-Oct-17 00:34
Re: Gables v Arch 159 Barbelo 27-Oct-17 01:19
Re: Gables v Arch 163 Jon Ellison 27-Oct-17 01:36
Re: Gables v Arch 168 Jon Ellison 27-Oct-17 01:49
Re: Gables v Arch 154 Barbelo 27-Oct-17 02:05
Re: Gables v Arch 154 Jon Ellison 27-Oct-17 02:17
Re: Gables v Arch 164 Barbelo 27-Oct-17 02:27
Re: Gables v Arch 149 Jon Ellison 27-Oct-17 03:40
Re: Gables v Arch 163 Barbelo 27-Oct-17 05:22
Re: Gables v Arch 159 Jon Ellison 27-Oct-17 06:45
Gables v Arch vs Truss 197 Dr. Troglodyte 27-Oct-17 19:33
Re: Gables v Arch vs Truss 175 Jon Ellison 27-Oct-17 20:50
Re: Gables v Arch vs Truss 145 Jon Ellison 27-Oct-17 21:20
Re: Gables v Arch vs Truss 145 Jon Ellison 27-Oct-17 21:53
Re: Gables v Arch vs Truss 268 Dr. Troglodyte 27-Oct-17 22:47
Re: Gables v Arch vs Truss 157 Jon Ellison 28-Oct-17 07:34
Re: Gables v Arch vs Truss 323 Jon Ellison 28-Oct-17 07:53
Re: Gables v Arch vs Truss 167 Dr. Troglodyte 28-Oct-17 16:08
Re: Gables v Arch vs Truss 220 Jon Ellison 28-Oct-17 18:13
Re: Gables v Arch vs Truss 153 Dr. Troglodyte 28-Oct-17 16:07
Re: Gables v Arch 170 Thanos5150 27-Oct-17 21:40
Re: Gables v Arch 186 Origyptian 27-Oct-17 22:40
Re: Gables v Arch 229 Barbelo 28-Oct-17 00:01
Re: Gables v Arch 217 Origyptian 28-Oct-17 10:03
Re: Gables v Arch 185 Barbelo 28-Oct-17 10:56
Re: Gables v Arch 317 Origyptian 28-Oct-17 13:30
Re: Gables v Arch 148 Barbelo 28-Oct-17 19:57
Re: Gables v Arch 144 Origyptian 28-Oct-17 22:45
Re: Gables v Arch 159 Barbelo 28-Oct-17 23:05
Re: Gables v Arch 163 R Avry Wilson 28-Oct-17 23:48
Re: Gables v Arch 208 Corpuscles 29-Oct-17 00:51
Re: Gables v Arch 198 Origyptian 29-Oct-17 05:19
Re: Mastaba of Shepsekaf 192 Origyptian 27-Oct-17 02:31
Re: Mastaba of Shepsekaf 175 Thanos5150 27-Oct-17 22:18
Re: Mastaba of Shepsekaf 155 Origyptian 27-Oct-17 22:50
Re: Mastaba of Shepsekaf 159 Thanos5150 27-Oct-17 23:46
Re: Mastaba of Shepsekaf 264 DUNE 27-Oct-17 07:58
Re: Mastaba of Shepsekaf 160 Thanos5150 27-Oct-17 22:04
Re: Mastaba of Shepsekaf 162 DUNE 27-Oct-17 23:08
Re: Mastaba of Shepsekaf 338 Thanos5150 28-Oct-17 02:34
Re: Mastaba of Shepsekaf 288 Corpuscles 28-Oct-17 04:43
Re: Mastaba of Shepsekaf 164 Barbelo 28-Oct-17 20:06
Re: Mastaba of Shepsekaf 227 Thanos5150 29-Oct-17 02:03
Re: Mastaba of Shepsekaf 201 Origyptian 29-Oct-17 05:16
Re: Mastaba of Shepsekaf 297 Thanos5150 29-Oct-17 05:39
Re: Mastaba of Shepsekaf 240 Origyptian 29-Oct-17 14:09
Re: Mastaba of Shepsekaf 198 Thanos5150 29-Oct-17 16:39
Re: Mastaba of Shepsekaf 223 Origyptian 29-Oct-17 16:56
Re: Mastaba of Shepsekaf 176 Thanos5150 28-Oct-17 16:00
Re: Mastaba of Shepsekaf 160 Barbelo 28-Oct-17 20:26


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