Partial and total factors of safety in anchored sheet pile design

1991 ◽  
Vol 28 (6) ◽  
pp. 812-817 ◽  
Author(s):  
A. J. Valsangkar ◽  
A. B. Schriver
Keyword(s):  
Design Method ◽  
Water Pressure ◽  
Design Approach ◽  
Foundation Engineering ◽  
Sheet Pile ◽  
Depth Of Penetration ◽  
Limit States ◽  
Working Stress ◽  
Conventional Methods ◽  
Sheet Pile Wall

Recently, the limit states design approach has been recommended in geotechnical design. The Canadian Foundation Engineering Manual (1985) details the new approach for design of foundations, slopes, and retaining structures. Some recent research has indicated that the use of the limit states design approach leads to conservative designs when compared with conventional methods of design. Results of a parametric study are presented in this paper. The study investigated the influence of sheet pile wall geometry, type of water-pressure distribution considered, and different methods of analysis on the required depth of penetration of an anchored sheet pile wall. Modifications are suggested to make the new design method compatible with the conventional methods of design. Key words: factor of safety, working stress design, ultimate limit states design, anchored sheet pile wall.

Anchor rod forces and maximum bending moments in sheet pile walls using the factored strength approach

1996 ◽  
Vol 33 (5) ◽  
pp. 815-821 ◽  
Author(s):  
A B Schriver ◽  
A J Valsangkar
Keyword(s):  
Water Pressure ◽  
Limit State ◽  
Bending Moment ◽  
Ultimate Limit State ◽  
Sheet Pile ◽  
Limit States ◽  
Working Stress ◽  
Geotechnical Design ◽  
Ultimate Limit State Design ◽  
Sheet Pile Wall

Recently, the limit states approach using factored strength has been recommended in geotechnical design. Some recent research has indicated that the application of limit states design using recommended load and strength factors leads to conservative designs compared with the conventional methods. In this study the influence of sheet pile wall geometry, type of water pressure distribution, and different methods of analysis on the maximum bending moment and achor rod force are presented. Recommendations are made to make the factored strength design compatible with conventional design. Key words: factored strength, working stress design, ultimate limit state design, anchored sheet pile wall, bending moment, anchor rod force.

Target reliability based design optimization of anchored cantilever sheet pile walls

2008 ◽  
Vol 45 (4) ◽  
pp. 535-548 ◽  
Author(s):  
B. Munwar Basha ◽  
G. L. Sivakumar Babu
Keyword(s):  
Failure Mode ◽  
Steel Sheet ◽  
Target Component ◽  
Sheet Pile ◽  
Limit States ◽  
Reliability Based Design ◽  
Section Modulus ◽  
Reliability Method ◽  
The Stability ◽  
Sheet Pile Wall

In this study, the stability of anchored cantilever sheet pile wall in sandy soils is investigated using reliability analysis. Targeted stability is formulated as an optimization problem in the framework of an inverse first order reliability method. A sensitivity analysis is conducted to investigate the effect of parameters influencing the stability of sheet pile wall. Backfill soil properties, soil – steel pile interface friction angle, depth of the water table from the top of the sheet pile wall, total depth of embedment below the dredge line, yield strength of steel, section modulus of steel sheet pile, and anchor pull are all treated as random variables. The sheet pile wall system is modeled as a series of failure mode combination. Penetration depth, anchor pull, and section modulus are calculated for various target component and system reliability indices based on three limit states. These are: rotational failure about the position of the anchor rod, expressed in terms of moment ratio; sliding failure mode, expressed in terms of force ratio; and flexural failure of the steel sheet pile wall, expressed in terms of the section modulus ratio. An attempt is made to propose reliability based design charts considering the failure criteria as well as the variability in the parameters. The results of the study are compared with studies in the literature.

Target Reliability Levels for Pipeline Limit States Design

1996 ◽  
Author(s):  
T. J. E. Zimmerman ◽  
Q. Chen ◽  
M. D. Pandey
Keyword(s):  
Reliability Analysis ◽  
Oil And Gas ◽  
Design Method ◽  
Risk Level ◽  
Design Standards ◽  
Limit States ◽  
Working Stress ◽  
Partial Safety Factors ◽  
Pipeline Design ◽  
Design Factors

The limit states design appendix currently being developed for inclusion in the Canadian Standards Association pipeline design code, Z662, Oil and Gas Pipeline Systems contains preliminary partial safety factors that were selected on the basis that they result in designs similar to those produced using the existing working stress design standards. This paper suggests an approach for selecting partial factors for limit states design of pipelines based on formal reliability analysis. Such an approach recognizes that consistent safety levels can be achieved for different pipeline sections by varying the target reliability as a function of the severity of failure consequences, where consequences are measured in terms of public safety, economic costs, and damage to the environment. Where the consequences of failure are more severe, higher reliability is required. Where the consequences are less severe, lower reliability can be tolerated, with the same risk level being achieved. This paper reviews the limit states design method and discusses the selection of target reliability levels and the reliability analysis procedures used to calibrate partial design factors.

Total and partial factors of safety in geotechnical engineering

1985 ◽  
Vol 22 (4) ◽  
pp. 477-482 ◽  
Author(s):  
L. D. Baikie
Keyword(s):  
Slope Stability ◽  
Factor Of Safety ◽  
Retaining Walls ◽  
Shallow Foundations ◽  
Deep Foundations ◽  
Foundation Engineering ◽  
Sheet Pile ◽  
Limit States ◽  
Partial Load ◽  
Geotechnical Design

The use of partial factors of safety in geotechnical design is introduced in the second edition of the Canadian Foundation Engineering Manual. The partial factors have been obtained from comparisons with conventional methods of analysis. Studies presented herein for simple slopes, cantilevered rigid retaining walls, flexible sheet pile walls, shallow strip foundations, and pile foundations indicate that modifications to some of the suggested partial load and resistance modification factors are necessary if comparable designs are to be obtained. Key words: factor of safety, partial factors, limit states design, slope stability, retaining walls, shallow foundations, deep foundations, bearing capacity.

Limit States Design—An Innovation in Design Standards for Steel Structures

1974 ◽  
Vol 1 (1) ◽  
pp. 1-13 ◽  
Author(s):  
D. J. Laurie Kennedy
Keyword(s):  
Design Method ◽  
Steel Structures ◽  
Probability Of Failure ◽  
Simple Design ◽  
Design Standards ◽  
Limit States ◽  
Working Stress ◽  
Wide Range ◽  
Ultimate Resistance ◽  
Two Sides

The greater rationality of limit states design as compared to working stress design is developed to show that limit states design leads to a more consistent probability of failure and that neither overly safe and therefore uneconomic structures nor structures with insufficient safety should result from this design methodology.This rationality is extended in the limit states design method in that the performance of the structure and its components is checked against the various limit states at the appropriate load levels. Thus the limit states of serviceability are checked at specified load levels and of strength and stability at the factored load levels.Functions are presented for the two sides of the inequality:[Formula: see text]A comparative design of a 20-storey structure selected to provide a wide range of variables shows that limit states design as proposed results in a structure comparable to that designed by working stress method with a moderate saving in the weight of steel. Some simple design examples are worked out to show the basic similarities between working stress design and limit states design and that the two methods are of about equal complexity or simplicity. It is believed, because the designer will have to check the ultimate resistance against the effect of the factored loads, that he will develop a greater awareness of the behavior of the material and members with which he is working.

Eighteenth Canadian Geotechnical Colloquium: Limit States Design For Foundations. Part II. Development for the National Building Code of Canada

1996 ◽  
Vol 33 (6) ◽  
pp. 984-1007 ◽  
Author(s):  
Dennis E Becker
Keyword(s):  
Reliability Index ◽  
Resistance Factor ◽  
Design Approach ◽  
Building Code ◽  
Foundation Engineering ◽  
Limit States ◽  
Resistance Factors ◽  
Code Calibration ◽  
Factor Design ◽  
Ultimate Limit

The geotechnical engineering profession in Canada is in the process of evaluating limit states design (LSD) for its incorporation into codes of practice for foundation engineering to provide a consistent design approach between geotechnical and structural engineers. This paper describes the work carried out for the initial development of LSD for foundations in the National Building Code of Canada. A load and resistance factor design approach, based on a factored overall geotechnical resistance, is used. The resistance factors for the ultimate limit states of bearing capacity and sliding of shallow and deep foundations are derived from a direct calibration with working stress design (WSD) and from a reliability analysis. The resistance factors derived from both approaches are consistent with each other and provide a reasonably constant reliability index of about 3.0 to 3.5. A relationship is presented that relates the reliability index to a global factor of safety and resistance factor. Design examples are provided that show that the proposed LSD produces designs that are comparable with those produced by traditional WSD. The importance of serviceability limits states is discussed, and the items that require further study and research work to refine code calibration are identified. Key words: limit states design, reliability index, code calibration, resistance factors, foundations, ultimate limit states.

scholarly journals Analysis of Seepage Characteristics of a Foundation Pit with Horizontal Waterproof Curtain in Highly Permeable Strata

Water ◽  
2021 ◽  
Vol 13 (9) ◽  
pp. 1303
Author(s):  
Chenghua Shi ◽  
Xiaohe Sun ◽  
Shengli Liu ◽  
Chengyong Cao ◽  
Linghui Liu ◽  
...  
Keyword(s):  
Hydraulic Conductivity ◽  
Theoretical Calculation ◽  
Calculation Method ◽  
Design Method ◽  
Water Pressure ◽  
Water Inflow ◽  
Deep Foundation ◽  
Foundation Pit ◽  
Deep Foundation Pit ◽  
Seepage Characteristics

At present, jet-grouted horizontal waterproof curtain reinforcement has become an essential method for deep foundation pit groundwater control. However, there is still a lack of an effective theoretical calculation method for horizontal waterproof curtain reinforcement, and there is little research on the seepage laws of foundation pits under different horizontal waterproof curtain conditions. Based on Darcy’s seepage theory, theoretical analysis models of deep foundation pit seepage were established considering the effect of a horizontal curtain in a highly permeable formation. Through the established models, the calculation method of the water inflow and the water pressure under the condition of a horizontal curtain was derived. Then through indoor tests, the reliability of the theoretical calculation method was verified. Furthermore, the established theoretical calculation method is used to analyze the influence of various factors on the water inflow and the water pressure, such as the ratio of hydraulic conductivity of the horizontal curtain to surrounding soil, thickness, and reinforcement position of the horizontal curtain. It is found that the hydraulic conductivity ratio has the most significant influence on the seepage characteristics of the foundation pit. Finally, the design method was applied to an example of the horizontal waterproof curtain of the foundation pit, which is located at Juyuanzhou Station in Fuzhou (China). The water inflow per unit area is 0.36 m3/d in the foundation pit, and this implies that the design method of the horizontal waterproof curtain applied for the excavation case is good and meets the requirements of design and safety.

Development on Environmental Geotechnology for Overhead Transmission Line Foundation Engineering in China

2012 ◽  
Vol 610-613 ◽  
pp. 2813-2818
Author(s):  
Xian Long Lu ◽  
Zeng Zhen Qian
Keyword(s):  
Transmission Line ◽  
Environmental Protection ◽  
Transmission Lines ◽  
Water Conservation ◽  
Design Method ◽  
Foundation Engineering ◽  
Foundation Construction ◽  
Overhead Transmission Line ◽  
Tower Foundation ◽  
Soil And Water

This paper presents the concept and the fundamental issues and the development on the environmental geotechnology in transmission lines foundation engineering. Namely, environmental geotechnology and theory is to study the restriction effects of environment on the transmission line routes, foundation selection and reliability, to predict the results of transmission line foundation construction on the environment, and to study on countermeasures of environmental protection in transmission foundation engineering. And then, from the above three aspects, the design method combined strength and displacement for tower foundation, the selection on foundation types and technical scheme for transmission line tower, and the countermeasures for soil and water conservation, the author introduces the development and practice of environmental geotechnology for transmission lines foundation engineering in China.

Sign in / Sign up

Export Citation Format

Share Document