资料简介： Size Effects and the Dynamic Response of Plain Concrete
( \) E6 m& H4 K5 r* e V. Bindiganavile 1 and N. Banthia 21 ?2 P& Z/ M9 H
Abstract: This paper investigates the specimen size effect on the dynamic response of plain concrete. The report is based upon
, j. @% ^3 Y7 X0 q* E; X experimental data by the writers and others and considers results from creep tests on beams, beams under flexural impact, and cylinders
, V5 J: r* x$ y) i+ z$ V% ]2 ^7 e under axial impact loading. Size effect is examined using Ba?ant’s size effect law and the multifractal scaling law, and both scaling models
5 _3 i6 h. c- w( X( J 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.
+ S2 u/ w% O+ ^: o* r9 E Under quasi-static loading, plain concrete in compression is less sensitive to the specimen size. But under impact, the compressive
8 n9 o. V% H: m/ Q6 V1 i response appears to be more size dependent than flexure. However, upon accounting for the stress rate effects, the flexural response- K9 ~8 j* o; e. b' C) j* q
depicts a more significant size effect, similar to that seen at quasi-static rates.# O. z" D$ m& Y! P' \! K7 ~9 ]
DOI: 10.1061/_ASCE_0899-1561_2006_18:4_485_# ? E( L8 ~: V" t3 O8 v
CE Database subject headings: Fracture; Concrete; Size effect; Dynamic response1 L- x0 l* V# U( K% l9 G4 T' }
素混凝土的尺寸效应及动态响应' p, o, V4 d% a& U- Y) w
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。
* A- x8 Z2 L5 X0 c' R% W& d DOI（数字对象唯一标识）: 10.1061/_ASCE_0899-1561_2006_18:4_485_
# r4 l7 t+ T. z# f2 X; E+ u 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。
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