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Unformatted text preview: Name: “WWW”
University of California, Berkeley Department of Civil Engineering
Fall Semester 260K Instructor: S. A. Mahin CE 124  DESIGN OF TIMBER STRUCTURES PRACTICE MIDTERM EXAMINATION NO. 2 This examination is open book and
notes. Please show all calcuiations and indicate all relevant assumptions. 1. (XX)
Unless indicated otherwise, typical 2. (XX)
California coastai climatic conditions and standard mili practices may be 3. (XX)
assumed. When in doubt regarding lumber grading, use WWPA rules. Total: (100)
Problem 1 a. A pin ended column has a 4 x 8 nominal crosssectional dimension and is No. 2
Douglas Fir—Larch. What is the longest length that is permitted by the National
Design Speciﬁcation regardless of the computed allowable design compression SUBSS? K ,.._ , f 7 2, €— 1"}2‘,
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ﬂ / a: was  LEW, c. A glulam has been instalied upside dOWH. List two potential problems with this situation.
i COﬂFiLZ a: 53mm 20am 3 7&4? Ué’e'ﬁ ff“ ?"5‘f"‘3’0~
2 iﬂ a“ mgr: e 2ch. 7“ t fit/{.15 is?
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(:1. When are 3/4 — inch thick laminations used in Glulams? WHEM rm: HEW/£3611“ I! Sat/drift?” CWaw'p {IO H”wa 1 G 77%” e 5‘ r?) U t. CE 124  Trial Midterm Exam No. 2 Name: Problem 2 An 8 x 8 inch section (nominal) of No. 2 Douglas Fir ~ Larch is to be used as a part of a
earthquake resistant system. The member is pined ended, has an applied axial load of 8
kips and has a length of 24 ft. A transverse load, F, is applied at the midspan of the
member due to gravity effects. What is the maximum value of F that can be applied
simultaneously with the seismic load? You may igno{e_§e,aﬁng,_§geﬁ and deﬂection con iderations in our ca eulations. "'"m‘ 1 , I: «52 ~ F
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if; r f M ﬁg“ .115!” 32.30 g— m
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’ if [\J CE 124 — Trial Midterm Exam No. 2 Name: Problem 3 What is the allowable bending moment that can be resisted by a glulam beam with a cross
section of 6614 by 36 inches? The beam has a combination symbol 20FuE10. The
spacing between lateral supports for the compression face of the beam is 12 feet. The 48
ft. long beam is simply supported at its ends and the ends are braced against torsional
rotation. The beam will be used where the equilibrium moisture content will be 24%. Note: Be prepared ALSO to compute displacements for given immediate or sustained
loading conditions, and to compare these results to allowable values. . a ,2” ,_
L : 43 H z 41 ff 6% a 34 CM : a 2? we sesame;
USé' 20F~ ASE? Ft: 2000 rs: assumes T'E'W’m’“ NW“ Netewe
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 Spring '09
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