Deep foundation design in the new Ontario Highway Bridge Design Code

1983 ◽  
Vol 20 (1) ◽  
pp. 173-176
Author(s):  
Bengt H. Fellenius ◽  
Geoffry G. Meyerhof
Keyword(s):  
Dynamic Monitoring ◽  
Pile Groups ◽  
Design Code ◽  
Bridge Design ◽  
Limit States ◽  
Foundation Design ◽  
Deep Foundation ◽  
Capacity Limit ◽  
Load Tests ◽  
High Level

A review is presented of some aspects of deep foundation design in the new Ministry of Transportation and Communications of Ontario, ultimate limit states Bridge Design Code. The design of axial pile capacity distinguishes between structural capacity limit and geotechnical capacity limit. The geotechnical capacity of a driven pile is governed by the dynamic impedance of the pile cross section. Higher geotechnical capacity, for instance due to soil setup, can only be utilized if proven to exist. Different capacity modification factors are used for routine load tests and high level test loading. Modern methods of dynamic monitoring are included and capacity determination by such methods is accepted as equivalent to determination from routine load tests. Lateral capacity of single piles and group piles, downdrag, and inclined loading of pile groups are considered, as are details such as splicing and use of pile shoes. Pile spacing is given as a function of expected pile length.

Deep foundation design in the new Ontario Highway Bridge Design Code: Discussion

1983 ◽  
Vol 20 (4) ◽  
pp. 858-859
Author(s):  
Baidar Bakht ◽  
Leslie G. Jaeger ◽  
Roger A. Dorton
Keyword(s):  
Highway Bridge ◽  
Design Code ◽  
Bridge Design ◽  
Foundation Design ◽  
Deep Foundation

Reliability-based design criteria for timber bridges in Ontario

1986 ◽  
Vol 13 (1) ◽  
pp. 1-7 ◽  
Author(s):  
Andrzej S. Nowak ◽  
Raymond J. Taylor
Keyword(s):  
Reliability Index ◽  
Structural Reliability ◽  
Structural Safety ◽  
Design Code ◽  
Bridge Design ◽  
Limit States ◽  
Acceptance Criterion ◽  
Reliability Based Design ◽  
Load And Resistance Factor ◽  
Timber Bridges

The new Ontario Highway Bridge Design Code (OHBDC) is based on limit states theory and therefore uses a load and resistance factor format. This paper deals with the development of the basis for the timber bridge design provisions (OHBDC). Three structural systems are considered: sawn timber stringers, laminated nailed decks, and prestressed laminated decks. The latter system has been successfully used in Ontario for the last 7 years.The acceptance criterion in calculation of load and resistance factors is structural reliability. It is required that bridges designed using the new code must have a reliability equal to or greater than a preselected target value. Reliability is measured in terms of the reliability index. The safety analysis is performed for a structural system rather than for individual members. The live load model was developed on the basis of available truck survey data. Material properties are based on extensive in-grade test results. Numerical examples are included to demonstrate the presented approach. Key words: bridge deck, design code, prestressed timber, reliability, reliability index, stringers, structural safety, timber bridges.

scholarly journals Reliability-based geotechnical design in 2014 Canadian Highway Bridge Design Code

2016 ◽  
Vol 53 (2) ◽  
pp. 236-251 ◽  
Author(s):  
Gordon A. Fenton ◽  
Farzaneh Naghibi ◽  
David Dundas ◽  
Richard J. Bathurst ◽  
D.V. Griffiths
Keyword(s):  
Structural Engineering ◽  
Highway Bridge ◽  
Design Code ◽  
Bridge Design ◽  
Limit States ◽  
Simple Fact ◽  
Codes Of Practice ◽  
Geotechnical Design ◽  
Civil Codes ◽  
Load And Resistance Factor

Canada has two national civil codes of practice that include geotechnical design provisions: the National Building Code of Canada and the Canadian Highway Bridge Design Code. For structural designs, both of these codes have been employing a load and resistance factor format embedded within a limit states design framework since the mid-1970s. Unfortunately, limit states design in geotechnical engineering has been lagging well behind that in structural engineering for the simple fact that the ground is by far the most variable (and hence uncertain) of engineering materials. Although the first implementation of a geotechnical limit states design code appeared in Denmark in 1956, it was not until 1979 that the concept began to appear in Canadian design codes, i.e., in the Ontario Highway Bridge Design Code, which later became the Canadian Highway Bridge Design Code (CHBDC). The geotechnical design provisions in the CHBDC have evolved significantly since their inception in 1979. This paper describes the latest advances appearing in the CHBDC along with the steps taken to calibrate its recent geotechnical resistance and consequence factors.

scholarly journals Proposal for considering the group effect in the prediction of settlements in pile groups through load transfer methods

2021 ◽  
Vol 44 (2) ◽  
pp. 1-8
Author(s):  
Francisco Vladson Cardins Gomes Filho ◽  
Alfran Sampaio Moura
Keyword(s):  
Load Transfer ◽  
Load Capacity ◽  
Experimental Results ◽  
Interactive Effects ◽  
Group Effect ◽  
Pile Groups ◽  
Limit States ◽  
Load Tests ◽  
Settlement Ratio

When designing a foundation project, it is necessary to ensure that all the elements meet both ultimate and serviceability limit states, which call for predictions of settlement and load capacity. The load transfer methods are a widely used alternative to estimate the load-settlement ratio of piles in the design of foundation projects. However, traditional load transfer methods do not consider the interactive effects between the elements in pile groups. This study proposes changes to the load transfer curves developed by Bohn et al. (2016), aiming to incorporate the group effect in the analysis of load-settlement relationships in pile groups. Comparisons between the predicted settlements obtained using the proposed method and the results of load tests performed by Dai et al. (2012) in Jiangsu, China, showed that the modifications proposed in this study agreed well with the experimental results for most of the analyzed groups.

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