周洪涛,彭 刚,胡海周,梁春华
循环荷载作用下混凝土塑性变形试验研究
周洪涛,彭 刚,胡海周,梁春华
摘 要:研究了循环荷载作用下普通混凝土和钢纤维含量为2.0%的混凝土圆柱形试件,在应变速率为10-5/s、10-4/s、10-3/s时的卸载点应变与累积塑性应变的关系。试验结果表明,在开始卸载点的应变值相同的情况下,钢纤维含量相同的混凝土提高应变速率会增加混凝土的累积塑性应变;在混凝土中添加适量的钢纤维能延缓混凝土在加载后期的破坏;高应变速率会加快混凝土材料的累积塑性应变增长。
Abstract: The normal concrete and 2% steel fiber reinforced concrete (SFRC)of the cylinder concrete are tested, and the relationship of the strain of unloading point and accumulated plastic strain are studied with three kind strain rates:10-5/s, 10-4/s and 10-3/s. The tests results show that at the same strain of unloading point level, the accumulated plastic strain of SFRC is increased with the increase of the strain rates when the contents of steel fiber are the same. It shows that adding proper steel fiber can delay the damage of concrete at later loading age, and high strain rate can promote the growth of the accumulated plastic strain of concrete.
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