If the stability coefficients φ of axial compression columns with a type a, b and c sections are φa、φb、φc, respectively, in the following items, which one is correct? ( )
A. φa≤φb≤φc
B. φb≤φa≤φc
C. φc≤φb≤φa
D. Can't judge
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What should be checked in the serviceability limit state? ( )
A. Strength
B. Stiffness
C. Global stability
D. Local stability
What are the calculation contents of solid-web beam-columns? ( )
A. Strength checking
B. Global stability checking
C. Local stability checking
D. Stiffness checking
The stiffness of the member under combined axial forces and moments is usually measured by ( )?
A. Slenderness ratio
B. Deflection at the mid-span
C. Width-to thickness ratio
D. The length of the member
In order to ensure full penetration, the welding edges often need to be made into groove. When the thickness of the welding piece is less than , unilateral V or V-shaped groove with ramp can be used.
A. 10 mm
B. 15 mm
C. 20 mm
D. 25 mm