scholarly journals Optimization of Culvert Dimensions and Reliability

2021 ◽  
Author(s):  
Salma Tawfiq
Keyword(s):  
Risk Analysis ◽  
Failure Probability ◽  
Carrying Capacity ◽  
Hydraulic Structure ◽  
Hydraulic Testing ◽  
Second Moment ◽  
First Order ◽  
Several Variables ◽  
Analysis Calculation ◽  
First Order Second Moment

A culvert is a hydraulic structure constructed to increase the water carrying capacity away from highway and buildings in the environment. Culverts have received less attention over the years because they are not highly visible, even if they have sufficient performance. Culverts offer much smaller investment options compared with bridges and in many cases they have replaced small bridges. Culverts are also less hazardous in the case of failure. This study brings together results about several variables of culverts including optimum dimensions, shapes, materials and inlet configurations. During culvert design, hydraulic testing was required for sizing of structures, where risk analysis calculation has been performed regarding the probability of inadequate capacity of culvert design to pass floods. The failure probability is estimated using the advanced first order second moment (AFOSM) method. Therefore, the methodology ensures the design of the hydraulic structure fulfills the required role, while minimizing its future effects in the environment.

scholarly journals Optimization of Culvert Dimensions and Reliability

2021 ◽  
Author(s):  
Salma Tawfiq
Keyword(s):  
Risk Analysis ◽  
Failure Probability ◽  
Carrying Capacity ◽  
Hydraulic Structure ◽  
Hydraulic Testing ◽  
Second Moment ◽  
First Order ◽  
Several Variables ◽  
Analysis Calculation ◽  
First Order Second Moment

A culvert is a hydraulic structure constructed to increase the water carrying capacity away from highway and buildings in the environment. Culverts have received less attention over the years because they are not highly visible, even if they have sufficient performance. Culverts offer much smaller investment options compared with bridges and in many cases they have replaced small bridges. Culverts are also less hazardous in the case of failure. This study brings together results about several variables of culverts including optimum dimensions, shapes, materials and inlet configurations. During culvert design, hydraulic testing was required for sizing of structures, where risk analysis calculation has been performed regarding the probability of inadequate capacity of culvert design to pass floods. The failure probability is estimated using the advanced first order second moment (AFOSM) method. Therefore, the methodology ensures the design of the hydraulic structure fulfills the required role, while minimizing its future effects in the environment.

Reliability Assessment of Corrosion Initiation of Harbor Concrete Structure Using FOSM

2008 ◽  
Vol 385-387 ◽  
pp. 621-624 ◽  
Author(s):  
Sang Hun Han ◽  
Woo Sun Park
Keyword(s):  
Failure Probability ◽  
Concrete Structure ◽  
Moment Method ◽  
Probabilistic Approach ◽  
Chloride Diffusion ◽  
Second Moment ◽  
First Order ◽  
Corrosion Initiation ◽  
First Order Second Moment ◽  
Second Moment Method

Due to the uncertainty of variables in durability model, the probabilistic approach is increasing. Monte Carlo Simulation (MCS) is an easily accessible method, but requires a lot of repeated operations. This paper evaluated the effectiveness of First Order Second Moment method (FOSM), which is more convenient and time saving method than MCS, to predict the corrosion initiation in harbor concrete structure. Mean Value First Order Second Moment method (MV FOSM) and Advanced First Order Second Moment method (AFOSM) are applied to the error function solution of Fick's second law modeling chloride diffusion. Reliability index and failure probability based on MV FOSM and AFOSM are compared with the results by MCS. The comparison showed that AFOSM and MCS predict similar reliability indexes and MV FOSM underestimates the probability of corrosion initiation by chloride attack. Also, the sensitivity of variables in durability model to failure probability was evaluated on the basis of AFOSM. The results showed that AFOSM is a simple and efficient method to estimate the possibility of corrosion initiation in harbor concrete structures.

Reliability Analysis of High Pressure Buried Pipeline under Landslide

2014 ◽  
Vol 501-504 ◽  
pp. 1081-1086 ◽  
Author(s):  
Long Yun ◽  
Le Kang
Keyword(s):  
Failure Probability ◽  
Moment Method ◽  
Reliability Index ◽  
Normal Operation ◽  
Strength Theory ◽  
Second Moment ◽  
First Order ◽  
The Third ◽  
First Order Second Moment ◽  
Second Moment Method

The landslide disaster tends to cause safe hidden trouble to the normal operation of the pipeline and pipeline is likely to take place accident and get failed under the action of a landslide. According to the theory of winkler, in the condition of pipeline landslide, the mechanical model is established and calculated the stress distribution under different landslide scale. According to the calculation result, the dangerous section of pipe is obtained. Based on the pipeline's own strength and pipeline working stress in the landslide, the limit state equation of the pipes is set up by using the third strength theory. Finally according to the distribution of stress and strength, the pipeline reliability index and failure probability are obtained by means of the first order second moment method improved. The achievement of this paper has great value .to the buried gas pipeline risk assessment. Key words: landslides; The third strength theory; The first order second moment method; Reliability index; Failure probability

Reliability analysis of a structural element based on the Advanced First-Order-Second-Moment Method.

1985 ◽  
Vol 51 (472) ◽  
pp. 2811-2816
Author(s):  
Yoshisada MUROTSU ◽  
Masaaki YONEZAWA ◽  
Hiroo OKADA ◽  
Satoshi MATSUZAKI ◽  
Toshiki MATSUMOTO
Keyword(s):  
Reliability Analysis ◽  
Moment Method ◽  
Structural Element ◽  
Second Moment ◽  
First Order ◽  
First Order Second Moment ◽  
Second Moment Method

scholarly journals First-order second-moment analysis of the buckling of shells with random imperfections

AIAA Journal ◽  
1987 ◽  
Vol 25 (8) ◽  
pp. 1113-1117 ◽  
Author(s):  
I. Elishakoff ◽  
S. van Manen ◽  
P. G. Vermeulen ◽  
J. Arbocz
Keyword(s):  
Moment Analysis ◽  
Second Moment ◽  
First Order ◽  
First Order Second Moment

Reliability of laminated plates via the first-order second-moment method

1990 ◽  
Vol 15 (2) ◽  
pp. 161-167 ◽  
Author(s):  
G. Cederbaum ◽  
I. Elishakoff ◽  
L. Librescu
Keyword(s):  
Moment Method ◽  
Laminated Plates ◽  
Second Moment ◽  
First Order ◽  
First Order Second Moment ◽  
Second Moment Method

A study on Modified Advanced First Order Second Moment method for Beam-to-Column Connections

2013 ◽  
Author(s):  
SooMi Shin ◽  
◽  
DongEun Lee ◽  
HyeMin Kim ◽  
HyunJung Park ◽  
...  
Keyword(s):  
Moment Method ◽  
Second Moment ◽  
First Order ◽  
First Order Second Moment ◽  
Second Moment Method
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