國立高雄大學圖資館 |

Language: English

Back

Low-cycle fatigue of steel under various constraints.

Record Type:	Electronic resources : Monograph/item
Title/Author:	Low-cycle fatigue of steel under various constraints.
Author:	Rosien, Fritz Joachim.
Description:	250 p.
Notes:	Chair: Claudia P. Ostertag.
Notes:	Source: Dissertation Abstracts International, Volume: 64-09, Section: B, page: 4510.
Contained By:	Dissertation Abstracts International64-09B.
Subject:	Engineering, Civil.
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3105350
ISBN:	049652917X

Low-cycle fatigue of steel under various constraints.
Rosien, Fritz Joachim.

Low-cycle fatigue of steel under various constraints. [electronic resource] - 250 p.

Chair: Claudia P. Ostertag.

Thesis (Ph.D.)--University of California, Berkeley, 2003.

In order to trigger the root causes of the fracture behavior of welded Steel Moment Resisting Frames (SMRFs) subjected to earthquake loading, the general influence of constraint effects and microstructural changes have been investigated on a small scale in fully reversed low-cycle fatigue loading. Regions of constraint with local stress-raisers have been places of crack initiation in recent earthquakes (Northridge as well as Hyokogen-Nanbu). SEM fractographs of the fracture surfaces have been taken to support and explain the general test results.

ISBN: 049652917XSubjects--Topical Terms:

212394
Engineering, Civil.

Low-cycle fatigue of steel under various constraints.
LDR:03045nmm _2200277 _450 001 162209
005 20051017073422.5
008 230606s2003 eng d
020 $a 049652917X
035 $a 00148710
035 $a 162209
040 $a UnM $c UnM
100 0 $a Rosien, Fritz Joachim. $3 227330
245 1 0 $a Low-cycle fatigue of steel under various constraints. $h [electronic resource]
300 $a 250 p.
500 $a Chair: Claudia P. Ostertag.
500 $a Source: Dissertation Abstracts International, Volume: 64-09, Section: B, page: 4510.
502 $a Thesis (Ph.D.)--University of California, Berkeley, 2003.
520 # $a In order to trigger the root causes of the fracture behavior of welded Steel Moment Resisting Frames (SMRFs) subjected to earthquake loading, the general influence of constraint effects and microstructural changes have been investigated on a small scale in fully reversed low-cycle fatigue loading. Regions of constraint with local stress-raisers have been places of crack initiation in recent earthquakes (Northridge as well as Hyokogen-Nanbu). SEM fractographs of the fracture surfaces have been taken to support and explain the general test results.
520 # $a The most important and remarkable result is, that toughness in general has almost no influence on the cyclic performance of steel in constraint. This applies to low and high stress levels as well as low and high constraint, covering the whole range of possible scenarios of low-cycle and even towards high-cycle fatigue. Performance enhancing factors in---mostly crack initiation controlled---cyclic resistance, however, are high yield strength and high constraint. Both reduce the corresponding local strains at the notch tip, which finally cause crack initiation---unless high implied nominal stresses cause an early ductile crack initiation, resulting in poor cyclic resistance regardless of material properties and amount of constraint.
520 # $a While high toughness is still important to enhance the fracture strength in order to accommodate the maximum imposed stresses/strains in earthquake loading, high yield strength plays the key role in the general cyclic performance below this critical value. This in general applies to different structural steels as well as expectable microstructural changes in the parent metal due to welding procedures in SMRFs. The material properties necessary for sufficient fracture resistant design (fracture strength, toughness) and fatigue design (cyclic performance, yield strength) are very contrary in constraint for this specific type of connection and consequently raise doubt about the ability of welded SMRF connections to perform safely from this perspective at all.
590 $a School code: 0028.
650 # 0 $a Engineering, Civil. $3 212394
650 # 0 $a Engineering, Materials Science. $3 226940
710 0 # $a University of California, Berkeley. $3 212474
773 0 # $g 64-09B. $t Dissertation Abstracts International
790 $a 0028
790 1 0 $a Ostertag, Claudia P., $e advisor
791 $a Ph.D.
792 $a 2003
856 4 0 $u http://libsw.nuk.edu.tw/login?url=http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3105350 $z http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3105350