The member forces in the principal tie of a butterfly roof truss are as follows:
$\begin{matrix} Member & Due to dead (kN) & Dead to wind load (kN) (Tension) & (Tension) A B & 26 & 40 B C & 13 & 32 C D & 8 & 16 \end{matrix}$

The factored design load for the principal tie is ______.

99 kN

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250 kN

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315 kN

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210 kN

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Solution

The correct option is A 99 kN
$\begin{matrix} Member & Load combination 1.5 (DL + WL) A B & 1.5 (26 + 40) = 99 kN B C & 1.5 (18 + 32) = 75 kN C D & 1.5 (8 + 16) = 30 kN \end{matrix}$

$∴ M a x i m u m d e s i g n l o a d = 1.5 (26 + 18 + 8 + 40 + 32 + 16)$

Maximum of AB, BC & CD = 99 kN

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Similar questions

Q. Match List-I with List-II and select the correct answer using the codes given below the lists.

\begin{matrix} List-I & List-II P. Boom & 1. Tension member in a roof truss Q. Tie & 2. Member supporting roof in a building R. Joist & 3. Compression member in a roof truss S. Strut & 4. Compression member in a crane \end{matrix}

Q. In roof truss for principal rafter most-frequently used section is ____.

Q. The maximum effective slenderness ratio for a member normally acting as a tie in a roof truss or a bracing system not considered effective when subjected to possible reversal of stress into compression resulting from the action of wind or earthquake forces will be_______

An unequal angle section $200 mm \times 150 mm \times 15 mm$ is to be used in a truss as a strut of effective length 4.5 m. The cross - sectional properties of the section are as follows:
$Area of cross - section = 5025 m m^{2}$
$I_{x x} = 2 \times 10^{7} m m^{4}, I_{y y} = 9.7 \times 10^{6} m m^{4}$ $a n d I_{x y} = - 8.3 \times 10^{6} m m^{4}$

By using the table of permissible compressive stress given below, the load on the member should be_____kN
$\begin{matrix} λ & 100 & 110 & 120 & 140 & 150 & 160 & 170 & 180 σ_{a c} (M P a) & 80 & 72 & 64 & 51 & 45 & 41 & 37 & 33 \end{matrix}$

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The member forces in the principal tie of a butterfly roof truss are as follows: MemberDue to dead (kN)Dead to wind load (kN)(Tension)(Tension)AB2640BC1332CD816 The factored design load for the principal tie is ______.

The correct option is A 99 kNMemberLoad combination 1.5 (DL + WL)AB1.5(26+40)=99 kNBC1.5(18+32)=75 kNCD1.5(8+16)=30 kN ∴Maximum design load = 1.5(26+18+8+40+32+16) Maximum of AB, BC & CD = 99 kN

The member forces in the principal tie of a butterfly roof truss are as follows:
$\begin{matrix} Member & Due to dead (kN) & Dead to wind load (kN) (Tension) & (Tension) A B & 26 & 40 B C & 13 & 32 C D & 8 & 16 \end{matrix}$

The factored design load for the principal tie is ______.

The correct option is A 99 kN
$\begin{matrix} Member & Load combination 1.5 (DL + WL) A B & 1.5 (26 + 40) = 99 kN B C & 1.5 (18 + 32) = 75 kN C D & 1.5 (8 + 16) = 30 kN \end{matrix}$

$∴ M a x i m u m d e s i g n l o a d = 1.5 (26 + 18 + 8 + 40 + 32 + 16)$

Maximum of AB, BC & CD = 99 kN