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.
引文
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