混凝土
混凝土
혼응토
CONCRETE
2015年
7期
44-48
,共5页
李卫宁%徐金俊%陈宗平%谭秋虹
李衛寧%徐金俊%陳宗平%譚鞦虹
리위저%서금준%진종평%담추홍
圆钢管再生混凝土%偏压%取代率%耗能%延性%刚度
圓鋼管再生混凝土%偏壓%取代率%耗能%延性%剛度
원강관재생혼응토%편압%취대솔%모능%연성%강도
recycled aggregate concrete filled circular steel tube%eccentric compression%replacement ratio%energy dissipation%ductility%stiffness
为了研究圆钢管再生混凝土在偏心荷载作用下的性能退化规律，以再生粗骨料取代率、长细比和偏心距为变化参数，设计了15个试件进行静力单调加载试验，在此基础上分析了其变形延性、耗能能力和刚度退化的演化过程。研究结果表明：圆钢管再生混凝土试件的耗能能力随再生粗骨料取代率的增加而提高，再生混凝土试件的延性比普通混凝土试件的大；长细比在31．3至38．26时，试件的耗能能力增长较快，而长细比过大则降低其耗能能力；试件的变形延性随长细比的增长而增大，而其弹性刚度随长细比的增大而呈线性衰减；偏心受压试件的耗能能力总体上大于轴心受压试件，随着偏心距的增大，试件的延性系数呈稳步增长的趋势；所建议的刚度退化计算模型可为圆钢管再生混凝土受压构件的工程设计提供必要的参考。
為瞭研究圓鋼管再生混凝土在偏心荷載作用下的性能退化規律，以再生粗骨料取代率、長細比和偏心距為變化參數，設計瞭15箇試件進行靜力單調加載試驗，在此基礎上分析瞭其變形延性、耗能能力和剛度退化的縯化過程。研究結果錶明：圓鋼管再生混凝土試件的耗能能力隨再生粗骨料取代率的增加而提高，再生混凝土試件的延性比普通混凝土試件的大；長細比在31．3至38．26時，試件的耗能能力增長較快，而長細比過大則降低其耗能能力；試件的變形延性隨長細比的增長而增大，而其彈性剛度隨長細比的增大而呈線性衰減；偏心受壓試件的耗能能力總體上大于軸心受壓試件，隨著偏心距的增大，試件的延性繫數呈穩步增長的趨勢；所建議的剛度退化計算模型可為圓鋼管再生混凝土受壓構件的工程設計提供必要的參攷。
위료연구원강관재생혼응토재편심하재작용하적성능퇴화규률，이재생조골료취대솔、장세비화편심거위변화삼수，설계료15개시건진행정력단조가재시험，재차기출상분석료기변형연성、모능능력화강도퇴화적연화과정。연구결과표명：원강관재생혼응토시건적모능능력수재생조골료취대솔적증가이제고，재생혼응토시건적연성비보통혼응토시건적대；장세비재31．3지38．26시，시건적모능능력증장교쾌，이장세비과대칙강저기모능능력；시건적변형연성수장세비적증장이증대，이기탄성강도수장세비적증대이정선성쇠감；편심수압시건적모능능력총체상대우축심수압시건，수착편심거적증대，시건적연성계수정은보증장적추세；소건의적강도퇴화계산모형가위원강관재생혼응토수압구건적공정설계제공필요적삼고。
In order to study the performance degradation of recycled aggregate concrete filled circular steel tube under eccentric com-pression loading,15 specimens with different replacement ratio of recycled coarse aggregate,slenderness ratio and eccentricity were test-ed under the monotonic static loading. On this basis,the evolutionary process of ductility,energy dissipation and rigidity degeneration were analyzed. The results show that the energy dissipation of recycled aggregate concrete filled circular steel tube specimens can be en-hanced with the increasing of recycled coarse aggregate replacement ratio,and the ductility of recycled coarse aggregate specimens is larger than that of normal concrete specimens.When the slenderness ratio is between 31.3 and 38.26,the energy dissipation of specimens is enlarged faster,while it can be decreased when the slenderness ratio is too large. An increase of slenderness ratio lead to an increase of the deformation ductility but a decrease of elastic stiffness. The total energy dissipation of specimens under eccentric compression is lar-ger that that of specimens under axial compression. With the increase of eccentric distance,the ductility factor of specimens can be in-creased steady. The model of rigidity degeneration can be served as a conference in engineering calculation for design the recycled ag-gregate concrete filled circular steel tube members.
