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- <title>WeBWorK : Winter201920-Engr220-002003 : HW16 : 5
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- <P style="margin: 0">(10 points) Difficulty (4/5)
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- <B><I> Dimensions: </B></I><BR/>
- <TABLE BORDER='1' STYLE='text-align:center;'>
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- <TD><div align="center"><I> a </div></I></TD><TD><div align="center"><I> b </div></I></TD><TD><div align="center"><I> c </div></I></TD>
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- <TD><div align="center"> 12 in </div></TD><TD><div align="center"> 8 ft </div></TD><TD><div align="center"> 3.7 ft </div></TD>
- </TR>
- </TABLE>
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- <B><I> Problem Statement: </B></I><BR/>
- A wooden deck is constructed to support a haystack as shown. The joists of the floor are to be made with dressed air-dry douglas fir lumber with nominal widths of 2 inches. You know that a 14"x18"x36" square bale of this kind of hay weighs 68 lb, and you are assuming the hay in the haystack has the same density as these square bales. (This is probably a conservative estimate, since the bales are probably denser than the stack in reality.) You would like to design the joists to have a factor of safety of 4.6 against yielding. Determine the following:
- <P>
- (a) The maximum value of the distributed load applied to one joist.<BR/>
- (b) The maximum bending moment experienced by one joist.<BR/>
- (c) The minimum required height <I> h </I> of the joists.<BR/>
- (d) The minimum required section modulus of the joists.<BR/>
- (e) The smallest standard lumber size acceptable to use for joists.
- <P>
- <B><I> Answers: </B></I><BR/>
- (a) <span class="MathJax_Preview">[math]</span><script type="math/tex">w_{max}</script> = <input type=text class="codeshard" size=10 name="AnSwEr0001" id="AnSwEr0001" aria-label="answer 1 " value="-47.92380952 lb/ft"/>
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- <BR/>
- (b) <span class="MathJax_Preview">[math]</span><script type="math/tex">M_{max}</script> = <input type=text class="codeshard" size=10 name="AnSwEr0002" id="AnSwEr0002" aria-label="answer 2 " value="-1533.561905 lb*ft"/>
- <input type=hidden name="previous_AnSwEr0002" value="-1533.561905 lb*ft"/>
- <BR/>
- (c) <span class="MathJax_Preview">[math]</span><script type="math/tex">h_{min}</script> = <input type=text class="codeshard" size=10 name="AnSwEr0003" id="AnSwEr0003" aria-label="answer 3 " value=""/>
- <input type=hidden name="previous_AnSwEr0003" value=""/>
- <BR/>
- (d) <span class="MathJax_Preview">[math]</span><script type="math/tex">S_{min}</script> = <input type=text class="codeshard" size=10 name="AnSwEr0004" id="AnSwEr0004" aria-label="answer 4 " value=""/>
- <input type=hidden name="previous_AnSwEr0004" value=""/>
- <BR/>
- (e) Lumber Choice = <SELECT class="pg-select" NAME = "AnSwEr0005" id="AnSwEr0005" SIZE=1>
- <OPTION SELECTED VALUE ="" > </OPTION>
- <OPTION VALUE ="2x4" > 2x4 </OPTION>
- <OPTION VALUE ="2x6" > 2x6 </OPTION>
- <OPTION VALUE ="2x8" > 2x8 </OPTION>
- <OPTION VALUE ="2x10" > 2x10 </OPTION>
- <OPTION VALUE ="2x12" > 2x12 </OPTION>
- </SELECT>
- <P>
- <I> be sure to include units with your answers </I>
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