b$)$ Find the load in numbers: $g1,$ gb$,$ sd and ac of Truw $2(20$ points$)M_P=F_y,Z,f_b=\frac{M_p}{\text{I}},F_y(A992)=50k*si,F_y(36)=36k*si$

$4\mathrm{.}7\mathrm{.}2$ Reduction in Uniform Live Loads

Subject to the limitations of Sections $4\mathrm{.}7\mathrm{.}3$ through

$4\mathrm{.}7\mathrm{.}6,$ members for which a value of $K_n,A$ is $400ft?$

$)$ or more are pernitted to he devighed for a

reduced live load in accordance with the following

formula:

$L=L(0\mathrm{.}25+\frac{15}{\sqrt[\phantom{2}]{{}_H{}_i}})$

In $SI$:

$L=L(0\mathrm{.}25+\frac{4\mathrm{.}57}{\sqrt[\phantom{2}]{K_{1x}{A}_r}})$

Whare

$L=$ reduced design live load per $f^2(m^2)$ of area

supported by the member

$L_1=$ unreduced design lise load per $f^2(m^2)$ of area

supported by the member $($see Table $+-1)$

$K_H=$ live load element factor $($sec Table $+-2)$

$A_r=$ rributary ansa in $f^2(m^2)$

L$.$ shall not be less than $0\mathrm{.}501.$ for members

supporting ore tloor and $l.$ Shall not be less than

$40L$ for members supporting two or more

floors.

Table $+21.$he Lnat Fhnum Factor: KusProblem $4$

For the shown roof truss system solve questions a and b $(30$ points$)$:

a$)$ Draw truss #$2$ and calculate the louds on it$.$ In your idealization consider support a as a

roller and support in as pinned. LL:$110$ pof, DL: $20$ psf$.$ Use the below load combinations.

$(10$ points$)$

$1\mathrm{.}4D$

$1\mathrm{.}2D+1\mathrm{.}6L+0\mathrm{.}5(L,orSorR)$

Please do all parts to this problem.