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451.

The ratio of the plastic moment capacity to the yield moment capacity of a rolled steel beam section is about

A.	1	B.	1.15
C.	1.55	D.	1.85

452.

The ratio of the plastic moment capacity to the yeld moment capacity of a rectangular section is

A.	1.15	B.	1.25
C.	1.5	D.	1.85

453.

The plastic design of steel structures which is based on upper bound theorem is

A.	safe, unsafe	B.	unsafe, safe
C.	safe, safe	D.	unsafe, unsafe

454.

The ultimate strength design of steel structures makes use of

A.	elastic analysis of structures	B.	plastic analysis of structures
C.	elastic and plastic analysis of structures	D.	ultimate analysis

455.

The moment-cuvature relation at a plastic hinge is

A.	a constant moment for different curvatures	B.	is a constant curvature for all moments
C.	always linear	D.	always linear

456.

The plastic design of a structure based on which of the following is always safe?

A.	Mechanism method of analysis	B.	Statistical method of plastic analysis
C.	Upper bound theorem of plastic analysis	D.	All of the above

457.

The limit design of steel structures makes use of

A.	elastic analysis of structures	B.	plastic analysis of structures
C.	elastic and plastic analysis of structures	D.	ultimate analysis

458.

The plastic design of a steel structure based on which of the following unsafe?

A.	Kinematic method of plastic analyis	B.	Mechanism method of plastic analysis
C.	Upper bound theorem	D.	All of the above

459.

The plastic hinge in a section is caused when

A.	all the fibres at a section reach the yield state	B.	the material at a section reaches plastic state
C.	the extreme fibres at a section reach the yield state	D.	none of the above

460.

For a circular section the ratio of the plastic moment capacity to the yield moment capacity is

A.	1.86	B.	1.1
C.	1.44	D.	1.7