NEW DEVELOPMENTS IN DESIGN METHODS OF PILE FOUNDATIONS
Author: PEDRO S. SÊCO E PINTO | Size: 360 KB | Format:PDF | Quality:Original preprint | pages: 14
ABSTRACT:
The design methods of pile foundations are addressed in this paper. The limit states for pile design are considered. The different methods for the verification of limit states are described. The evaluation of geotechnical parameters for pile design, by field and laboratory tests is analysed. The foundation movements to avoid the occurrence of an ultimate limit state or a serviceability limit state are addressed. The most popular tests to assess the quality control of piles are described. Two examples of application related with the foundations design of Guadiana bridge and New Tagus bridge are presented.
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USE OF INNOVATIVE IDEAS IN GEOTECHNICAL ENGINEERING
Author: Patrick K. Wong | Size: 495 KB | Format:PDF | Quality:Original preprint | Publisher: Young Geotechnical Professionals Conference | Year: 2004 | pages: 12
ABSTRACT :
This keynote lecture describes the use of innovative ideas and concepts in geotechnical engineering. The message of this lecture is that innovation in engineering does not necessarily have to be new ways of doing things. Rather, it is more important to create value to projects by learning and applying ideas and concepts (whether old or new) in an innovative manner. A number of examples are given based on the author’s recent experience, ranging from site investigation method, laboratory testing, numerical analysis, piled raft and pile group foundations, and soft ground engineering.
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Insecure transportation systems are costing our worldwide mobility-based economy as much as 6% of GDP annually. The effectiveness of security measures vary widely. In the United States, depending on the mode of transportation, it ranges from "medium effectiveness” for airports to "low effectiveness” for maritime, rail, transit, and intermodal activities. Situational awareness and interoperability are lacking as we try to deal with both natural and man-made disasters. Regardless of the transport mode, improvements are essential if governments and corporations are to address security planning, response, and national preparedness. Transportation Security examines this problem in a comprehensive manner and addresses security-based technologies and solutions to minimize risk.
* Covers air, sea, roadway, rail and public transport modes
* Offers technological solutions for mobility based problems in planning, logistics and policy to improve security, combat terrorism and ensure national preparedness
* Includes work of international experts & global examples related to transportation security
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Insight on 2D versus 3D modelling of surface foundations via strength of materials solutions for soil dynamics
Author: John P Wolf & Jethro W Meek | Size: 690 KB | Format:PDF | Quality:Scanner | Publisher: Earthquake Engineering and Structural Dynamics | Year: 1994 | pages: 22
To simplify the analysis, three-dimensional soil structure interaction problems are often modelled by considering a two dimensional slice without changing the material properties of the soil. This procedure, although convenient, is of questionable validity because two dimensional modeling inherently overestimates the radiation damping for translational and rocking motions. To make matters worse, two dimensional modelling always entails an underestimation of the dynamic spring coefficient for the translational motions. The damping ratio of the two dimensional case, which is proportional to the ratio of the damping coefficient to the spring coefficient, will thus be even larger. Thus, reliance upon a two dimensional analysis based on an equivalent slice of a strip foundation may result in a dangerously non conservative design.
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Posted by: netsonicyxf - 09-27-2012, 02:38 AM - Forum: Archive
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Understand the design of cast-in-place bridge superstructures according to the AASHTO LRFD Bridge Design Specifications. This book presents step-by-step analysis and design procedures with minimal use of computer software. Five detailed design examples include: (1) Simple span flat slab bridge, (2) Simple span T-beam bridge, (3) Three span flat slab bridge, (4) Three span T-beam bridge, and (5) Deck overhang.
Posted by: netsonicyxf - 09-27-2012, 02:36 AM - Forum: Archive
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The publication identifies disturbed regions of structures resulting from geometric or force discontinuities where Strut-and-Tie Model (STM) must be used. A step-by-step procedure for STM is provided. Five detailed design examples are also provided: (1) Design of cap beam, (2) Design of footing, (3) Design of pile cap, (4) Design of dapped end region of girder, and (5) Design of hammerhead pier.
Insecure transportation systems are costing our worldwide mobility-based economy as much as 6% of GDP annually. The effectiveness of security measures vary widely. In the United States, depending on the mode of transportation, it ranges from "medium effectiveness" for airports to "low effectiveness" for maritime, rail, transit, and intermodal activities. Situational awareness and interoperability are lacking as we try to deal with both natural and man-made disasters. Regardless of the transport mode, improvements are essential if governments and corporations are to address security planning, response, and national preparedness. Transportation Security examines this problem in a comprehensive manner and addresses security-based technologies and solutions to minimize risk.
* Covers air, sea, roadway, rail and public transport modes
* Offers technological solutions for mobility based problems in planning, logistics and policy to improve security, combat terrorism and ensure national preparedness
* Includes work of international experts & global examples related to transportation security
Author: IR. Liew Shah Shong & Fong Chew Chung | Size: 2 MB | Format:PDF | Quality:Original preprint | Publisher: Geotechnical Cource for Pile Foundation Design & Construction | Year: 2003 | pages: 49
Abstract :
This paper discusses the micropiles classification, design concept, problems associated with the common installation methods, construction control and performance of this piling system. Micropiiles can be designed as soil frictional piles and rock socketed piles either under tension or compression. Discussions will be addressed on the strain compatibility between the steel reinforcements and the grout under high carrying working load and the effects of grout in rock socketed micropile with permanent casings in the overburden soil. The strain compatibility problem of micropile, although important, is usually overlooked by many engineers. However, the inherent conservatism in the micropile design man obscure this compatibility problem. Construction control is another important aspect to warrant success of the micropiling system. Case histories on the construction problems, such as jointing of the reinforcements, disturbance to the subsurface materials induced by the different installation techniques and control of grouting operation, will be presented and discussed. Results of static pile load tests of micropiles are also presented. Generally, rock socketed micropiiles usually experience very small residual settlement as compared to other piling systems.
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