摘要：本文研究了素混凝土試樣動力響應(yīng)的尺寸效應(yīng)。該報告是根據(jù)作者和其他人的實驗數(shù)據(jù)并考慮了梁的蠕變、彎曲影響下的梁和受軸向沖擊載荷作用的圓柱體的試驗結(jié)果。尺寸效應(yīng)是通過使用Bažant的規(guī)模效應(yīng)法和多重標(biāo)法則來監(jiān)測的，而且縮放模式能夠捕捉尺寸效應(yīng)的強(qiáng)度。對于斷裂能，換言之，規(guī)模效應(yīng)僅僅體現(xiàn)在影響率上。在準(zhǔn)靜態(tài)荷載作用下，受壓素混凝土對試件尺寸更加不敏感。但是在沖擊作用下，壓縮反應(yīng)相對于彎曲作用似乎更依賴尺寸。然而，考慮到應(yīng)力變化率的影響，彎曲響應(yīng)描繪了更加重要的尺寸效應(yīng)，它類似于準(zhǔn)靜態(tài)荷載作用下的響應(yīng)。

DOI（數(shù)字對象唯一標(biāo)識）: 10.1061/（ASCE）0899-1561（2006）18:4（485）

土木工程數(shù)據(jù)庫主題詞：斷裂；混凝土；尺寸效應(yīng)；動態(tài)響應(yīng)。
Abstract: This paper investigates the specimen size effect on the dynamic response of plain concrete. The report is based upon experimental data by the writers and others and considers results from creep tests on beams, beams under flexural impact, and cylinders under axial impact loading. Size effect is examined using Bažant’s size effect law and the multifractal scaling law, and both scaling models 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 quasistatic 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 depicts a more significant size effect, similar to that seen at quasi-static rates.

DOI: 10.1061/( ASCE) 0899-1561( 2006) 18:4( 485)

CE Database subject headings: Fracture; Concrete; Size effect; Dynamic response.