STEEL MOMENT FRAME DAMAGE PREDICTIONS USING LOW-CYCLE FATIGUE
For over 40 years low-cycle fatigue has been known to be a cause of structural failure in steel frames. The utility of these findings was limited due to the inability of existing fatigue damage models to properly account for the complexities of connection behavior. Recent research has reinforced the significance of low cycle fatigue through identification of the state of stress in standard moment connections. In addition, testing has shown that fatigue life is measurable, repeatable, and varies significantly based on connection type.This paper presents a method for calculating the fatigue damage in steel moment frames. The results of nonlinear analysis are combined with experimentally obtained fatigue-damage curves to predict failure or the remaining useful life after an earthquake. Several example problems are presented where the response parameters of plastic hinge rotation and story drift are compared to FEMA-356 acceptance criteria and used to calculate damage using low cycle fatigue. Fatigue life predictions are presented for pre-Northridge, reduced beam section, and slotted web connections. The results indicate that fatigue life provides a more nuanced prediction of damage than hard deformation/deflection limits, and that the predicted damage correlates well with observed behavior.
fatigue damage steel connections calculation
S.D. Campbell R.M. Richard J.E. Partridge
Structural Analysis Consulting Group, Louisville, KY, USA Dept. of Civil Engineering, University of Arizona, Tucson, AZ, USA Smith-Emery Company, Los Angeles, CA, USA
国际会议
14th World Conference on Earthquake Engineering(第十四届国际地震工程会议)
北京
英文
2008-10-12（万方平台首次上网日期，不代表论文的发表时间）