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超长循环荷载下轻质混凝土疲劳特性
Fatigue Characteristic of Expanded Polystyrene Concrete under Ultra long Cyclic Loading
投稿时间:2017-08-17  修订日期:2017-11-08
DOI:103969/j.issn.1007 9629201804009
中文关键词:  轻质混凝土  超长循环荷载  阻尼比  动弹性模量  疲劳损伤
英文关键词:expanded polystyrene concrete  ultra long cyclic loading  damping ratio  dynamic elastic modulus  fatigue damage
基金项目:国家自然科学基金资助项目(51578147,51278099)
              
作者单位
尤佺
YOU Quan
东南大学交通学院,江苏南京210096
School of Transportation, Southeast University, Nanjing 210096, China
缪林昌
MIAO Linchang
东南大学交通学院,江苏南京210096
School of Transportation, Southeast University, Nanjing 210096, China
厉超
LI Chao
东南大学交通学院,江苏南京210096
School of Transportation, Southeast University, Nanjing 210096, China
胡圣堃
HU Shengkun
东南大学交通学院,江苏南京210096
School of Transportation, Southeast University, Nanjing 210096, China
方黄磊
FANG Huanglei
东南大学交通学院,江苏南京210096
School of Transportation, Southeast University, Nanjing 210096, China
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中文摘要:
      采用MTS万能试验机对外掺30%体积分数聚苯乙烯颗粒的轻质混凝土试件施加不同频率(5,10Hz)及荷载幅值(30,35,40kN)的超长循环荷载,进行累计2000×104振次的疲劳试验,研究其动应力应变滞回曲线形态随振次的变化规律,并计算了对应的阻尼比、动弹性模量等动力学性能.结果发现:与同强度等级的混凝土相比,轻质混凝土阻尼比较大,动弹性模量稍低,表明其吸能效果更好,韧性与抗裂性能也更为优异;轻质混凝土试件在1570×104振次左右出现了细微裂缝,根据其附近的应力应变关系发现,该试件的阻尼比与动弹性模量在疲劳损伤前后基本保持稳定;提出和验证了轻质混凝土疲劳寿命预测公式,并对其应用于道床的可行性进行了研究.
英文摘要:
      The cyclic loading with different frequencies(5,10Hz) and different amplitudes of the bias force(30,35,40kN) was applied to the fatigue test on expanded polystyrene concrete with volume mixing ratio of 30% by MTS 810 for accumulative vibration cyclic number of 20million times. Based on the analysis of variation of the dynamic stress strain hysteresis curves at different cyclic number, corresponding damping ratio and dynamic elastic modulus were calculated. Calculation results of damping ratio and dynamic elastic modulus indicate that expanded polystyrene concrete has superior performance of vibration attenuation, toughness and crack resistance. A slight crack occurs on the expanded polystyrene concrete specimen at about cyclic number of 1570×104, and damping ratio as well as dynamic elastic modulus is relatively stable before and after the small crack occurs. The fatigue life prediction formula of expanded polystyrene concrete is proposed and verified. In addition, the feasibility of applying expanded polystyrene concrete to ballast bed is explored with this prediction formula.
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