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Risk Analysis for Engineering 5

Tham khảo tài liệu 'risk analysis for engineering 5', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | CHAPTER Risk Analysis in Engineering and Economics fGE 4a RELIABILITY ASSESSMENT A. J. Clark School of Engineering Department of Civil and Environmental Engineering Risk Analysis for Engineering Department of Civil and Environmental Engineering University of Maryland College Park chapman hAll cRC CHAPTER 4a. RELIABILITY ASSESSMENT Slide No. Introduction The reliability of an engineering system can be defined as its ability to fulfill its design purpose defined as performance requirements for some time period and environmental conditions. The theory of probability provides the fundamental bases to measure this ability. CHAPTER 4a. RELIABILITY ASSESSMENT Slide No. Introduction The reliability assessment methods can be based on 1. Analytical strength-and-load performance functions or 2. Empirical life data. They can also be used to compute the reliability for a given set of conditions that are time invariant or for a time-dependent reliability. CHAPTER 4a. RELIABILITY ASSESSMENT Slide No. Introduction The reliability of a component or system can be assessed in the form of a probability of meeting satisfactory performance requirements according to some performance functions under specific service and extreme conditions within a stated time period. Random variables with mean values variances and probability distribution functions are used to compute probabilities. CHAPTER 4a. RELIABILITY ASSESSMENT Slide No. Analytical Performance-Based Reliability Assessment First-Order Second Moment FOSM Method. Advanced Second Moment Method Computer-Based Monte Carlo Simulation CHAPTER 4a. RELIABILITY ASSESSMENT Slide No. Analytical Performance-Based Reliability Assessment Advanced Second-Moment Method Z Z X1 X2 K Xn Supply - Demand 1a Z Z X1 X2 K Xn Structural strength - Load effect Z Z X X2 K Xn R-L 1c Z performance function of interest R the resistance or strength or supply L the load or demand as illustrated in Figure 1 1b