NZ structural design actions 1

In NZ, Limit State Design is used when designing structures. We must consider two limit states: __________ limit state (ULS) for strength and __________ limit state (SLS) for displacement.

Permanent loads are denoted with the letter

• Q

• P

• D

• G

Imposed loads are denoted with the letter

• Q

• I

• L

• G

The water in a public swimming pool would be considered

• a transitory load

• an imposed load

• a permanent load

• a live load

In ULS design, factors are applied to the

• material strengths

• deflections

• actions (loads}

• factors of safety

Different combinations of design actions must be considered when designing a structure. For ULS design, factors ( e.g. 1.2 , 0.9 ) which reflect _________________ are applied to each of the actions in the combination:

(choose two)

• the relative sizes of the loads

• the degree of certainty of the magnitudes of the loads

• the expected duration of the loads

• the actual loads in the combination

For SLS design, factors ( Ψ_s , Ψ_l ) are applied which reflect:

• the relative sizes of the loads

• the degree of certainty of the magnitudes of the loads

• the expected duration of the loads

• the actual loads in the combination

A 5.0 m long beam carries a permanent load of 2.5 kN/m and an imposed load of 12 kN/m. For ULS design of the beam, the total factored load on the beam is

• 72.5 kN

• 105 kN

• 21 kN

• 114.5 kN