Which of the following are NOT correct to explain parallel system

Each element is a possible failure mode for structure

Which of the following is the explanation for Out-crossing method

Calculate based on first occurrence of an excursion

Which of the following descriptions on series system is not correct

A statically indeterminate structure is a series system

Which of following is NOT among the steps involved for the Monte Carlo method

Calculate Factors of safety (FoS) of the structure

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Reliability quiz

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a reliability quiz for students

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Answers

1
Which of the following are NOT correct to explain parallel system
Probability of failure calculated as Pf=P(F1∩F2∩F3,.....∩Fn)
As picture shows
A statically in-determinate structure is a typical example
Each element is a possible failure mode for structure
2
Which of the following is the explanation for Out-crossing method
The life time is discretised into a number of units
Probability of failure described based on ß(t)=μG(t)/δG(t)
Calculate based on first occurrence of an excursion
Take the max value of load effect in a life time (S)
3
P(F₁)=0.04; P(F₂)=0.08; P(F₃)=0.05; P(F₄)=0.02; P(F₅)=0.09; P(F6)=0.33; P_f for system?
0.0000528
0.0016
0.0165
0.007963
4
G()=3X₁X₂, X₁means:3, X₂means:2, s.d for both are 1. Linearized limit state functions is?
G(y)=3y1y2+6y1+y2+18
G(y)=3y1y2+6y1+9y2+18
G(y)=3y1y2+9y1+6y2+18
G(y)=y1y2+6y1+9y2+18
5
G()=y₁+y₂+4,when G() <0, the structure fails. The design point is?
(-2, 2)
(-1, 1)
(-2,-2)
(-1,-1)
6
Failure probability is 0.01. Sample size is 300. How confident are you with this estimation?
98%
95%
None of above
97%
7
Which of the following descriptions on series system is not correct
Also called a “weakest link” system
pf =P(F1 U F2 U,...,UFm)
A statically indeterminate structure is a series system
The Configuration is shown as the picture
8
Which of the following are the Factors affecting structural system reliability
Examine the performance on a complex system
Configuration of the structure
Correlation of member properties and materials
All of above
9
For steel girder bridge, what may be the potential failure modes
Pier failure, rivets failure, connection failure
Bolts failure, buckling failure, foundation failure
Flexture failure, shear failure, Fatigue failure
All of above
10
Load effect : DL: 20 (COV 0.1), LL: 15 (COV 0.3). Resistance: 50 (s.d 5). safety index ？
-2.14
1.47
2.14
-1.47
11
Which of the following is the numerical method for reliability assessment
Integration method
Monte Carlo Simulation
First Order Second Moment (FOSM) method
First Order Reliability (FOR) Method
12
Which of following is NOT among the steps involved for the Monte Carlo method
Generate random variables
Establish limit state function
Calculate Factors of safety (FoS) of the structure
Compute statistics on results of limit state functions
13
Which is the dominate failure mode for Flinder Street Viaduct assessment
Flextute failure
Fatigue failure
Shear failure
Deflection failure

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