Translated Titles

High-Cycle Fatigue Behaviors of Reinforced Lightweight Concrete Beam





Key Words

疲勞 ; fatigue



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Chinese Abstract

本研究採用傳統油壓機試驗法,在固定之應力振幅下(荷重控制),以50T MTS油壓機進行反覆疲勞荷重試驗。並探討常重(NWC)及輕質混凝土(LWAC)樑試體,於反覆疲勞荷重下之力學行為及損傷程度。以Pmean/Py = 0.64、0.56、0.48及0.40為四種疲勞荷重之等級,荷重振幅Pamp(=Pmax-Pmin/2)固定為8kN,荷重頻率為2Hz,進行反覆疲勞荷重試驗。當反覆荷重循環次數N達2百萬次,而未完全斷裂之常重及輕質混凝土樑試體,則重新進行靜態荷重試驗,測試其殘餘強度(residual strength)。 試驗結果顯示:常重混凝土樑試體勁度之衰減(kN/k0)與荷重等級的大小(Pmean)無確切之關聯;而輕質混凝土樑試體,則隨著荷重等級的提高,勁度衰減(kN/k0)越明顯。輕質混凝土樑試體在高荷重等級(Pmean/Py=0.64、0.56)作用下之勁度衰減程度(kN/k0)略高於常重混凝土樑;而在低荷重等級(Pmean/Py=0.48、0.40)作用下時,則明顯小於常重混凝土樑。常重混凝土樑位移振幅(△N,amp)之增加與荷重等級的大小(Pmean)亦無確切之關係;而輕質混凝土樑則隨著荷重等級的提高,其位移振幅增加之幅度越大。輕質混凝土樑試體在高荷重等級(Pmean/Py=0.64、0.56)作用下之位移振幅增加幅度(△N,amp/△0)略高於常重混凝土樑;而在低荷重等級(Pmean/Py=0.48、0.40)作用下時,則明顯小於常重混凝土樑。在相同荷重等級作用下,輕質混凝土樑之殘餘撓度(△Rd)較常重混凝土樑少。常重及輕質混凝土樑之疲勞損傷量主要受荷重中值影響,荷重中值越高,疲勞損傷量越大。輕質混凝土樑在較高荷重等級(Pmean/Py=0.64、0.56)作用下,損傷程度略大於常重混凝土樑;而在較低荷重等級(Pmean/Py=0.48、0.40)作用下,其損傷程度明顯小於常重混凝土樑。

English Abstract

In this research, the fatigue behavior and damage of lightweight concrete (LWAC) beams subjected to cyclically dynamic loading was investigated and compared with that of corresponding normal weight concrete (NWC) beams. Traditional hydraulic press machine (MTS) was adopted with identical loading amplitudes on the basis of force control. Dynamic loading tests were implemented with 4 levels of loading magnitude (Pmean/Py=0.64、0.56、0.48 and 0.40). For each level, the loading amplitude (Pamp=(Pmax− Pmin) /2) was set to be constant values (Pamp=8 kN). Loading frequency is 2Hz. Further, if the specimen subjected to two million cycles of dynamic loading without entire failure, the static loading tests were performed to access the residual strength of beam. The experiment results showed that the relation between stiffness degeneration (kN/k0) and loading levels (Pmean/Py=0.64、0.56、0.48 and 0.40) of NWC beams is not obvious, but the relation of both in LWAC beams is obvious. For the higher loading level(Pmean/Py=0.64、0.56), the stiffness degeneration extent of LWAC beams is higher than that of NWC beams. However, for the lower loading level (Pmean/Py=0.48、0.40), the stiffness degeneration extent of LWAC beams definitely is less. For the higher loading level, the displacement amplitude ratio (△N,amp/△0 ) of LWAC beams were higher than that of NWC beams. In contrast, for the lower loading level, LWAC beams were lower. Besides, less residual deformation (△Rd) could be observed in the LWAC beams for the same loading level. The magnitude of mean loading has a conspicuousness effect on fatigue damage for NWC and LWAC beams. Fatigue damage of beams gradually increases with an increase of the loading level. For the higher loading level, the fatigue damage of LWAC beams is higher than that of NWC beams. Besides, for the lower loading level, the fatigue damage of LWAC beams obviously is much less than NWC beams.

Topic Category 工學院 > 土木工程學系所
工程學 > 土木與建築工程
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Times Cited
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