| 闫东明,林 皋,王 哲.变幅循环荷载作用下混凝土的单轴拉伸特性[J].水利学报,2005,36(5):0593-0597 |
| 变幅循环荷载作用下混凝土的单轴拉伸特性 |
| Uniaxial tensile properties of concrete under the action of cyclic variable amplitude load |
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| DOI： |
| 中文关键词: 变幅循环加载 单轴 拉伸强度 混凝土 |
| 英文关键词: cyclic variable amplitude load uniaxial tensile strength concrete |
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| 中文摘要: |
| 在MTS318电液伺服万能试验机上对76个哑铃形试件进行了变幅循环荷载作用下混凝土的单轴动态拉伸试验，系统地研究了初始静载、循环频率、循环增幅对混凝土动态强度以及变形特性的影响。研究结果表明，在地震作用的频率范围内变幅循环荷载作用下混凝土的动强度主要取决于每一循环内最高加载速率时的动强度，循环增幅的影响相对较小。随着初始静态荷载的增加，混凝土的动态强度趋于减小。随着循环数的增加，混凝土内产生的不可恢复的永久变形幅度也随之增加。 |
| 英文摘要: |
| Uniaxial tensile experiments of 76 concrete specimens were conducted on the MTS810 electro-fluid servo-universal machine to investigate the effect of initial static load, the cyclic frequency and the increment rate of cyclic load amplitude on the tensile properties of concrete. It is found that within the frequency range of earthquake excitation the dynamic strength of concrete under the action of cyclic variable amplitude load is dominated by the dynamic strength at maximum loading rate in each cycle. The effect of amplitude increment rate is slight. With the increase of initial static load, the dynamic strength of concrete tends to reduce. Following the increase of loading cycle the unrecoverable deformation of concrete also grows. |
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