HTI HUISWERKOPGAVE 8: hout ULS & SLS Uitgaande van het ...
HTI HUISWERKOPGAVE 8: hout ULS & SLS Uitgaande van het ...
HTI HUISWERKOPGAVE 8: hout ULS & SLS Uitgaande van het ...
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<strong>HUISWERKOPGAVE</strong> 8: <strong>hout</strong> <strong>ULS</strong> & <strong>SLS</strong><br />
LES BRON http://www.monsterfishkeepers.com/forums/showthread.php?t=164188 PAGINA<br />
<strong>HTI</strong><br />
<strong>Uitgaande</strong> <strong>van</strong> <strong>het</strong> ontwerp en de door de constructeur aangehouden belastingen <strong>van</strong><br />
som <strong>HUISWERKOPGAVE</strong> 7:<br />
1. Ontwerp en controleer op basis <strong>van</strong> bovenstaande belasting de vloer met een<br />
overspanning <strong>van</strong> 2,44 [m] in <strong>ULS</strong> en <strong>SLS</strong>. De hart op hart is 0,406 [m])<br />
Lezen we nu <strong>het</strong> artikel in de bijlage:<br />
We vergeten even dat de door de Amerikaanse constructeur aangehouden 40lbs/ft2<br />
ofwel 40 loumbs ofwel poundforce per square feet = 2 kN/m2 niet geheel overeenkomt<br />
met onze EUROCODE, maar uitgaande <strong>van</strong> de eerder berekende balkafmeting, gaan we<br />
de gebruikssituatie bekijken<br />
STORT <strong>het</strong> aquarium IN en buigt de vloer teveel door?<br />
Aangenomen: in de werkelijke situatie rekenen we <strong>het</strong> eigen gewicht <strong>van</strong> de vloer en <strong>het</strong><br />
plafond, verwaarlozen we lichte scheidingswanden (die zullen in een kamer <strong>van</strong> 2,44m<br />
niet nog eens optreden). Naast <strong>het</strong> aquarium rekenen we nog 0,4*1,75 kN/m2 voor <strong>het</strong><br />
overige gebruik. Alles zonder veiligheid omdat we een gebruikstoestand controleren<br />
t.o.v. een eerder gemaakte NORM-toestand.<br />
2. CONTROLEER ZONDER VEILIGHEID, dus met γfg = 1,0 & γfq = 1,0, <strong>het</strong> werkelijk<br />
optredende MOMENT en DWARSKRACHT (in <strong>SLS</strong>) in de <strong>hout</strong>en balk <strong>van</strong> afbeelding:<br />
B&E en vergelijk dit met de opneembare waarden (in <strong>ULS</strong>). Het verschil is een maat<br />
voor de veiligheid<br />
3. CONTROLEER de werkelijk optredende doorbuiging (in <strong>SLS</strong>) in de <strong>hout</strong>en balk <strong>van</strong><br />
afbeelding: B en vergelijk dit met de maximaal toelaatbare doorbuigingen
Bijlage:Second Floor Fish tanks – beam loading for the non-engineer 1<br />
This is a question I see come up a lot and I haven’t seen a good answer yet. Also,<br />
articles I have read on the internet seem to be geared for another engineer. So, I am<br />
going to try to give an reasonable explanation for people who passed high school math.<br />
Also, from the questions and comments, I might rewrite a little of the article.<br />
The first assumption is going to be that the building is built to modern American building<br />
codes. These were implemented in about the 1920’s and modern codes haven’t<br />
changed much since the 1950s. (40lbf/ft2 room load 2 , 16” on center framing, etc) 3<br />
Modern rooms are designed to withstand a force of 40lbs per square foot. This is a<br />
confusing notion because you can safely place an aquarium that has a floor pressure of<br />
more than 40 lbs/ft2. This standard means that you can place 40lbs/ft2 everywhere in<br />
the room and still be safe. This is a matter of how to safely load a beam.<br />
So, let’s imagine that we did place steel plates that are 1’X1’ 4 and weigh 40 lbs<br />
everywhere in a room. We will use a room that is 8’X16’ for an example. This is a safe<br />
room load.<br />
A.<br />
Now, we can re-stack these plates and redistribute the load. This is simplified<br />
representation of the plates. This is also a safe room load.<br />
1 Second Floor is in US eerste verdieping<br />
2 40*4.448222N/(0,304m*0,304m)=1925N/m2 is circa 2kN/m2 (veranderlijk)<br />
3 16’’ on center framing=406 mm hart op hart <strong>van</strong> de balken<br />
4 Elke 1footx1foot=0,304mx0,304m 40 LbF =[poundforce] komt overeen met voetnoot 1 : 2kN/m2<br />
LES BRON http://www.monsterfishkeepers.com/forums/showthread.php?t=164188 PAGINA<br />
<strong>HTI</strong>
B.<br />
Things can be moved around again. This is also a safe room load. 5<br />
C.<br />
But don’t do this. This is an unsafe room load.<br />
5 De schrijver heeft de 8 platen staal die in de breedte <strong>van</strong> kamer stonden nu in <strong>het</strong> midden opgestapeld.<br />
320Lbf=320*4.448222N=1423N Puntlast in <strong>het</strong> midden <strong>van</strong> de overspanning:L=8feet=8*0.3048=2.44m<br />
LES BRON http://www.monsterfishkeepers.com/forums/showthread.php?t=164188 PAGINA<br />
<strong>HTI</strong>
D.<br />
As you can see in the examples, if you take the beam length and multiply it by<br />
40lbs/ft2, you get the total load that a beam can withstand. The longer a beam the<br />
more weight it can hold because it is thicker.<br />
+++++++++++++++++++++++++++++++++++++++++<br />
+++++++++++++++++++++++++++++++++++++++++<br />
+++++++++++++++++++++++++++++++++++++++++<br />
+++++++++++++++++++++++++++++++++++++++++<br />
+++++++++++++++++++++++++++++++++++++++++<br />
++++++++++++++++++++++++++<br />
Find your fish tank weight<br />
Water is 8.33lbs/gal. 6 A safe assumption to include the stand, filtration, rocks, and the<br />
water in filtration is use 10lbs/gal. 7 Then add the dry tank weight.<br />
Full Tank weight=10lbs/gal + Dry tank weight<br />
Now, you can see if the tank can be placed safely using the 40lbs/ft2 stacked load<br />
concept. Let’s use a 125 gallon glass tank (200 lbs dry weight) for an example in our<br />
room. Also, the stand will be 18” wide and 6’ long. 8<br />
Full Tank Weight = (125 * 10) + 200 = 1450lbs 9<br />
Since we are concerned about weight per linear foot<br />
6 H20=10kN/m 3<br />
7 De schrijver heeft zelf een veiligheidsfactor toegevoegd<br />
8 18’’=18 inch = 1,5’ = 1,5 foot = 0,457 m bij 6’ foot lengte<br />
9 Zonder veiligheid(125*8,33)+200=1241 lbs = 1241*4.448222N = 5521N = 5.5kN totaal op 6*0.304m<br />
LES BRON http://www.monsterfishkeepers.com/forums/showthread.php?t=164188 PAGINA<br />
<strong>HTI</strong>
<strong>HTI</strong><br />
(Total weight)/(stand length) ---- 1450/6 = 241 lbs per linear foot<br />
We could have calculated the pounds per square foot, but we used the same stacking<br />
principal as we did with the steel tiles in example 1.<br />
Now, let’s put it into our room. And see what we get.<br />
E.<br />
Since 241 lbs/ft2 per beam is less than our 320lbs/ft2 per beam this is a safe room<br />
load. 10<br />
Summary:<br />
Calculate the safe beam load ---- Beam length * 40lbf<br />
Calculate the aquarium weight --- 10lbs * #gallons + dry tank weight<br />
Calculate the lbs per linear foot of the stand ---- full aquarium / stand length<br />
Make sure the lbs per linear foot of the full aquarium don’t exceed the safe beam load<br />
Assumptions: The room is up to modern building codes, the beam direction is known<br />
10<br />
241lbs komt overeen met 1072 N op elke feet breedte 3,5 kN/m1 met hart <strong>van</strong> de lijnlast op ½ * 1<br />
foot=0,15 [m] uit de wand.<br />
LES BRON http://www.monsterfishkeepers.com/forums/showthread.php?t=164188 PAGINA