不同温度后全轻混凝土单轴受压疲劳性能
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摘要
全轻混凝土(all-lightweight concrete,简称为ALWC)具有轻质高强、保温隔热、抗震及耐火抗冻等优良性能,在高层建筑、大跨度结构等工程中得到了广泛应用。但在实际工程中,混凝土建筑物除了承受静荷载外,还要经常承受疲劳等动荷载的作用,使结构在低于静载强度的情况下发生疲劳破坏或动载破坏。以LC30全轻混凝土为例,对分别经历高温、低温后全轻混凝土进行了单轴受压疲劳试验,得到了S-N曲线、ε-N曲线。与普通混凝土相比,同等条件下,全轻混凝土疲劳应变符合三阶段变化规律,但其疲劳寿命较低。
All-lightweight concrete has good properties of lightweight and high strength,thermal insulation,seismic and fire antifreeze,which is widely used in high-rise buildings,large-span structure engineering.But in practical engineering,the concrete buildings not only bear static loads,but also often under fatigue loads,which will makes the structure emerge fatigue failure or dynamic failure under the condition of static strength.Taking LC30 for an example.It gained S-N curves ε-N curves of ALWC for which subjected to high temperatures and low temperatures after developed corresponding uniaxial compression fatigue tests.Compared with ordinary concrete,though the fatigue strain accords with the law of three stages,the fatigue life of ALWC is lower than ordinary concrete.
All-lightweight concrete has good properties of lightweight and high strength,thermal insulation,seismic and fire antifreeze,which is widely used in high-rise buildings,large-span structure engineering.But in practical engineering,the concrete buildings not only bear static loads,but also often under fatigue loads,which will makes the structure emerge fatigue failure or dynamic failure under the condition of static strength.Taking LC30 for an example.It gained S-N curves ε-N curves of ALWC for which subjected to high temperatures and low temperatures after developed corresponding uniaxial compression fatigue tests.Compared with ordinary concrete,though the fatigue strain accords with the law of three stages,the fatigue life of ALWC is lower than ordinary concrete.
引文
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[13]杨润年,魏德敏.钢纤维混凝土等幅弯曲疲劳加载下的疲劳应变和疲劳模量以及损伤研究[J].工程力学,2012(11):99-102.
[14]孙巍巍,卢赛,张园,等.高强树脂混凝土弯拉疲劳损伤性能试验研究[J].建筑结构,2016(15):56-59.
[15]洪锦祥,缪昌文,石杏喜,等.混凝土疲劳变形曲线三阶段的比例关系与应变速率[J].南京理工大学学报(自然科学版),2013,37(1):150-155.
[16]张培,雷冬.疲劳荷载作用下的混凝土变形规律[J].河海大学学报(自然科学版),2015,43(1):34-38.
[17]刘国军,杨永清.一种基于残余应变的混凝土疲劳损伤模型[J].材料导报,2014,28(6):141-144.
[18]张明,张庆伟,赵军.钢纤维部分增强高强混凝土梁的疲劳变形性能[J].混凝土与水泥制品,2013(2):47-49.
[2]焦楚杰,高俊岳,王龙,等.轻骨料混凝土的研究进展[J].混凝土,2014(8):111-114.
[3]MEDEIROS A,ZHANG X,RUIZ G,et al.Effect of the loading frequency on the compressive fatigue behavior of plain and fiber reinforced concrete[J].International Journal of Fatigue,2014(70):342-350.
[4]UNDERWOOD B S,BAEK C,KIM Y R.Simplified viscoelastic continuum damage model as platform for asphalt concrete fatigue analysis[J].Transportation Research Record Journal of the Transportation Research Board,2012,2296(-1):36-45.
[5]LIU Q,SCHLANGEN E,VEN M V D,et al.Evaluation of the induction healing effect of porous asphalt concrete through four point bending fatigue test[J].Construction and Building Materials,2012,29(4):403-409.
[6]李宏,肖建庄.基于弹性模量的再生混凝土疲劳强度分析[J].建筑材料学报,2012,15(2):260-263.
[7]梁辉,彭刚,邹三兵,等.循环荷载下混凝土应力-应变全曲线研究[J].土木工程与管理学报,2014(4):55-59.
[8]卫军,李松林,董荣珍,等.考虑残余变形影响的混凝土疲劳损伤本构模型[J].湖南大学学报(自然科学版),2016,43(7):57-61.
[9]冯文贤,刘锋,郑万虎,等.橡胶混凝土疲劳性能的试验研究[J].建筑材料学报,2012,15(4):469-473.
[10]丁兆东,李杰.基于微细观机理的混凝土疲劳损伤本构模型[J].力学学报,2014,46(6):911-919.
[11]刘伟男.钢管混凝土抗压疲劳特性研究[D]兰州:兰州交通大学,2014:28-34.
[12]肖建庄,李宏.再生混凝土单轴受压疲劳性能[J].土木工程学报,2013(2):62-69.
[13]杨润年,魏德敏.钢纤维混凝土等幅弯曲疲劳加载下的疲劳应变和疲劳模量以及损伤研究[J].工程力学,2012(11):99-102.
[14]孙巍巍,卢赛,张园,等.高强树脂混凝土弯拉疲劳损伤性能试验研究[J].建筑结构,2016(15):56-59.
[15]洪锦祥,缪昌文,石杏喜,等.混凝土疲劳变形曲线三阶段的比例关系与应变速率[J].南京理工大学学报(自然科学版),2013,37(1):150-155.
[16]张培,雷冬.疲劳荷载作用下的混凝土变形规律[J].河海大学学报(自然科学版),2015,43(1):34-38.
[17]刘国军,杨永清.一种基于残余应变的混凝土疲劳损伤模型[J].材料导报,2014,28(6):141-144.
[18]张明,张庆伟,赵军.钢纤维部分增强高强混凝土梁的疲劳变形性能[J].混凝土与水泥制品,2013(2):47-49.