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Experimental Investigation of the Local Buckling and Fatigue Behavior of Slender and Tapered Spirally Welded Steel Tubes to Enable Taller Wind Towers.

Record Type:	Language materials, manuscript : Monograph/item
Title/Author:	Experimental Investigation of the Local Buckling and Fatigue Behavior of Slender and Tapered Spirally Welded Steel Tubes to Enable Taller Wind Towers./
Author:	Jay, Angelina Louise.
Description:	1 online resource (326 pages)
Notes:	Source: Dissertation Abstracts International, Volume: 78-10(E), Section: B.
Subject:	Civil engineering. -
Online resource:	click for full text (PQDT)
ISBN:	9781369806557

Experimental Investigation of the Local Buckling and Fatigue Behavior of Slender and Tapered Spirally Welded Steel Tubes to Enable Taller Wind Towers.
Jay, Angelina Louise.

Experimental Investigation of the Local Buckling and Fatigue Behavior of Slender and Tapered Spirally Welded Steel Tubes to Enable Taller Wind Towers. - 1 online resource (326 pages)

Source: Dissertation Abstracts International, Volume: 78-10(E), Section: B.

Thesis (Ph.D.)--Northeastern University, 2017.

Includes bibliographical references

The expansion of wind and other renewable energy sources is a primary challenge facing the United States. One avenue for reducing the cost and increasing the efficiency of wind generated electricity is to utilize taller towers to support turbines. Taller towers place the turbine in higher velocity winds with lower turbulence while allowing an increase in blade size, thereby significantly improving the energy output for a given turbine. Currently, the need to manufacture towers at centralized plants and transport them to site limits the size of the tower sections and restricts the ability to design structurally efficient towers. To this end, an automated spiral welding procedure used in the pipeline industry is being adapted to produce tapered tower sections on site, precluding transportation limits and allowing for the manufacture of more optimally designed sections that may be more slender than those used currently. In addition to being more slender, the weld pattern in these towers differs from conventionally welded towers. Slender structural members are historically sensitive to geometric imperfections and welds are known to induce geometric imperfections. The combined impact of this imperfection pattern and increased slenderness on the ultimate flexural strength of tapered spirally welded tubes is unknown. Additionally, the weld pattern requires the intersection of two welds at regular intervals along the tower. The fatigue performance of this weld intersection is unknown and may be critical as the design of wind towers can be controlled by fatigue.

Electronic reproduction.
Ann Arbor, Mich. :
ProQuest,
2018

Mode of access: World Wide Web

ISBN: 9781369806557Subjects--Topical Terms:

561339
Civil engineering.
Index Terms--Genre/Form:

554714
Electronic books.

Experimental Investigation of the Local Buckling and Fatigue Behavior of Slender and Tapered Spirally Welded Steel Tubes to Enable Taller Wind Towers.
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245 1 0 $a Experimental Investigation of the Local Buckling and Fatigue Behavior of Slender and Tapered Spirally Welded Steel Tubes to Enable Taller Wind Towers.
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500 $a Source: Dissertation Abstracts International, Volume: 78-10(E), Section: B.
500 $a Adviser: Andrew T. Myers.
502 $a Thesis (Ph.D.)--Northeastern University, 2017.
504 $a Includes bibliographical references
520 $a The expansion of wind and other renewable energy sources is a primary challenge facing the United States. One avenue for reducing the cost and increasing the efficiency of wind generated electricity is to utilize taller towers to support turbines. Taller towers place the turbine in higher velocity winds with lower turbulence while allowing an increase in blade size, thereby significantly improving the energy output for a given turbine. Currently, the need to manufacture towers at centralized plants and transport them to site limits the size of the tower sections and restricts the ability to design structurally efficient towers. To this end, an automated spiral welding procedure used in the pipeline industry is being adapted to produce tapered tower sections on site, precluding transportation limits and allowing for the manufacture of more optimally designed sections that may be more slender than those used currently. In addition to being more slender, the weld pattern in these towers differs from conventionally welded towers. Slender structural members are historically sensitive to geometric imperfections and welds are known to induce geometric imperfections. The combined impact of this imperfection pattern and increased slenderness on the ultimate flexural strength of tapered spirally welded tubes is unknown. Additionally, the weld pattern requires the intersection of two welds at regular intervals along the tower. The fatigue performance of this weld intersection is unknown and may be critical as the design of wind towers can be controlled by fatigue.
520 $a The research completed in this dissertation provides an experimental foundation for the design of slender spirally welded tubes for use as wind towers. The work includes large scale testing to assess flexural local buckling strength and performance, including experimental assessment of residual stress fields, detailed measurements of the initial imperfect geometry of the tube, measurements of local deformation during and after the completion of each test to enable analysis of the onset and evolution of local buckling, and an experimental investigation into the fatigue behavior of the weld intersection detail. These experimental results are intended to inform existing codified design methodologies and to enable non-existing, but more sophisticated design procedures.
533 $a Electronic reproduction. $b Ann Arbor, Mich. : $c ProQuest, $d 2018
538 $a Mode of access: World Wide Web
650 4 $a Civil engineering. $3 561339
650 4 $a Engineering. $3 561152
655 7 $a Electronic books. $2 local $3 554714
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710 2 $a Northeastern University. $b Civil and Environmental Engineering. $3 1181732
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