加勁阻尼鋼板之疲勞分析

Fatigue Analysis of Steel Plates for Added Damping and Stiffness

彭彥豪(Yen-Hao Peng)

指導教授 ： 侯建元

國立暨南國際大學/科技學院/土木工程學系/碩士(2012年)

https://doi.org/10.6837/NCNU.2012.00110

摘要

利用加勁阻尼鋼板受反覆載重時進入塑性而產生消能行為，乃是目前結構被動控制重要的手段之一，然因其涉及反覆之塑性變形，故有疲勞的問題產生。欲分析加勁阻尼鋼板在結構中之疲勞破壞，需取得加勁阻尼鋼板受到因地震產生之變幅載重導致破壞時的損傷累積值。為達此目的本研究先以等幅載重進行三角形加勁阻尼鋼板之疲勞試驗，並提出利用卸載勁度判斷試體疲勞壽命，結果顯示卸載勁度可有效的判斷疲勞壽命。
繼之以SAC載重施加於試體至其產生疲勞破壞，以探討SAC載重是否可用於鋼構件的地震疲勞分析。為取得加勁阻尼鋼板於地震時所受之變幅位移，以有限元素法計算結構加裝加勁阻尼鋼板受El Centro地震力的樓板位移反應，並將其施加於試體進行疲勞試驗。最後利用雨流記數法計算SAC載重與前述計算所得地震位移之循環數與位移範圍，利用Palmgren-Miner法則與前述由等幅載重試驗所取得之位移-壽命曲線，計算試體於破壞時的損傷累積值。結果顯示試體受SAC載重破壞時的總損傷值約為1，但受地震力導致疲勞破壞時，總損傷值約為0.5-0.8，由此推知SAC載重雖為具地震特性的載重但並不適用於鋼構件的疲勞分析，再則若假設鋼構件在總損傷值為1時破壞，將導致不保守的地震疲勞設計。

關鍵字

被動控制 ； 加勁阻尼鋼板 ； 金屬疲勞 ； 有限元素 ； 雨流記數法 ； 損傷累積

並列摘要

Added damping and stiffness (ADAS) steel plates in building structure has been widely used for the purpose of seismic energy dissipation. But this cycle loading has involved in plastic deformation, so the ADAS has some problem of fatigue behavior. For analysis of fatigue failure of ADAS in building structure, it has required to obtain ADAS by the cumulative damage value when the amplitude load generate by the seismic. To achieve this objective was the first amplitude load fatigue test of ADAS steel plate, and proposed use to unloading stiffness to determine the fatigue life of specimens, the results show that the unloading stiffness can effectively determine the fatigue life.
By the SAC load imposed on the specimens to fatigue failure, and to explore whether the SAC load steel components can be used in earthquake fatigue analysis. The finite element method to calculate the structure of the ADAS plate by the El Centro earthquake displacement response, and applied to the specimen fatigue test. Finally, the rain-flow counting method to calculate the load with SAC calculated vary displacement of the number of cycles and displacement range, The results showed that SAC total damage value of about 1, but seismic loading, the total damage value of about 0.5-0.8, the SAC load does not apply to steel structures in fatigue analysis.

並列關鍵字

Passive Control ； Added damping and stiffness ； Metal fatigue ； Finite element ； Rain-flow counting ； Damage accumulates

參考文獻

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