STEEL STRUCTURE

Single Choice $(2$points each, $20$ points totally$)$

$(1)$ Which is the plasticity index for the structural steel?

$($A$)$ Yield point;

$($B$)$ Notch toughness;

$($C$)$ Weldability;

$($D$)$ Elongation.

$(2)$ For structural carbon steels, the quality grade of the same type of steel is defined by

$($A$)$ Yield point;

$($B$)$ Notch toughness;

$($C$)$ Deoxidization process;

$($D$)$ Elongation.

$(3)$ There are two types of bolts in the ordinary bolted connection, which is

$($A$)$ Friction and bearing;

$($B$)$ Shear and compression;

$($C$)$ Shear and tensile;

$($D$)$ Tensile and compression.

$(4)$ A butt weld is shown as following. If the end tabs are not used, the effective weld length is

$($A$)460mm$;

$($B$)480mm$;

$($C$)500mm$;

$($D$)520mm$

$(5)$ A high$-$strength bolted connection in friction type subject to combined shear $N_v$ and tension $N_t,$ which following formula shall be taken to check the design capacity of the connection

$($A$)N_v^b=0\mathrm{.}9n_f(P-1\mathrm{.}25N_t)N_v$;

$($B$)N_{t}1\mathrm{.}25P$;

$($C$)\frac{N_t}{N_t^b}+\frac{N_v}{N_v^b}1$;

$($D$)\sqrt[\phantom{2}]{(\frac{N_t}{N_t^b}{)}^2+(\frac{N_v}{N_v^b}{)}^2}1$