资料简介: Size Effects and the Dynamic Response of Plain Concrete
& H( q$ B# Q7 W* V- C( B+ q1 A V. Bindiganavile 1 and N. Banthia 2
- M5 z; R' [+ K0 c Abstract: This paper investigates the specimen size effect on the dynamic response of plain concrete. The report is based upon
( @% s4 A5 v; ^/ c0 ^# I% E; F experimental data by the writers and others and considers results from creep tests on beams, beams under flexural impact, and cylinders& j' j1 K2 y" ?1 Q
under axial impact loading. Size effect is examined using Ba?ant’s size effect law and the multifractal scaling law, and both scaling models5 T, P" E M, _
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.
]8 c& {) t: l7 w- v2 S Under quasi-static loading, plain concrete in compression is less sensitive to the specimen size. But under impact, the compressive5 _1 D# e$ e: K% |
response appears to be more size dependent than flexure. However, upon accounting for the stress rate effects, the flexural response2 U! k, ]: \8 A) N0 R' S8 ?6 C. P1 t
depicts a more significant size effect, similar to that seen at quasi-static rates.
7 g1 z8 E# w* H. Z( C; R& O- P DOI: 10.1061/_ASCE_0899-1561_2006_18:4_485_
/ n* A" G" a' P0 j) F9 e; S CE Database subject headings: Fracture; Concrete; Size effect; Dynamic response
2 N. T% J( Z: M8 J0 _ 素混凝土的尺寸效应及动态响应! s# u5 n: v8 e3 T' A1 J' c
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。
$ H5 B$ Q& @% A( B5 R8 s) J DOI(数字对象唯一标识): 10.1061/_ASCE_0899-1561_2006_18:4_485_6 R4 r5 P, m ~; C+ [6 v
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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