素混凝土的尺寸效应及动态响应

资料简介：

　　Size Effects and the Dynamic Response of Plain Concrete
6 m4 k8 Q( X" _5 n4 ~　　V. Bindiganavile 1 and N. Banthia 2
7 e; V9 l% y  W0 N. E　　Abstract: This paper investigates the specimen size effect on the dynamic response of plain concrete. The report is based upon
3 b' v% e+ S( R- s: V2 T  x) {　　experimental data by the writers and others and considers results from creep tests on beams, beams under flexural impact, and cylinders
$ C" u! r4 S  B　　under axial impact loading. Size effect is examined using Ba?ant’s size effect law and the multifractal scaling law, and both scaling models
1 {' z: _1 t* ]　　are able to capture the size effect on strength. For fracture energy, on the other hand, the size effect manifests itself only at impact rates.
　　Under quasi-static loading, plain concrete in compression is less sensitive to the specimen size. But under impact, the compressive
　　response appears to be more size dependent than flexure. However, upon accounting for the stress rate effects, the flexural response
+ `. z0 q) b) N　　depicts a more significant size effect, similar to that seen at quasi-static rates.
/ F/ a) t4 Y( Z1 h( t. V1 S　　DOI: 10.1061/_ASCE_0899-1561_2006_18:4_485_
　　CE Database subject headings: Fracture; Concrete; Size effect; Dynamic response
　　素混凝土的尺寸效应及动态响应
8 o: {& n6 T( {. ?/ k/ g4 e' B) i　　摘要：本文研究了素混凝土试样动力响应的尺寸效应。该报告是根据作者和其他人的实验数据并考虑了梁的蠕变、弯曲影响下的梁和受轴向冲击载荷作用的圆柱体的试验结果。尺寸效应是通过使用Bazant的规模效应法和多重标法则来监测的，而且缩放模式能够捕捉尺寸效应的强度。对于断裂能，换言之，规模效应仅仅体现在影响率上。在准静态荷载作用下，受压素混凝土对试件尺寸更加不敏感。但是在冲击作用下，压缩反应相对于弯曲作用似乎更依赖尺寸。然而，考虑到应力变化率的影响，弯曲响应描绘了更加重要的尺寸效应，它类似于准静态荷载作用下的响应。
　　DOI（数字对象唯一标识）: 10.1061/_ASCE_0899-1561_2006_18:4_485_
9 o/ X+ d  ]! x1 x4 F　　数据库主题词　　土木工程数据库主题词：断裂;混凝土;尺寸效应;动态响应。