【摘要】：該文基于允許損傷尺度的概念,應(yīng)用William級(jí)數(shù)形式的裂縫尖端應(yīng)力場(chǎng)展開(kāi)式,獲得基于前三階級(jí)數(shù)的裂尖應(yīng)變場(chǎng),進(jìn)而考慮應(yīng)力松弛的影響,推導(dǎo)了允許損傷尺度的解析表達(dá)式。以有限尺寸的混凝土三點(diǎn)彎曲梁試件為例,將允許損傷尺度試驗(yàn)值與該文理論值進(jìn)行比較分析,分析了不同階數(shù)對(duì)應(yīng)的混凝土允許損傷尺度的變化規(guī)律。結(jié)果表明:該文所提的混凝土允許損傷尺度的理論值與試驗(yàn)值吻合較好;應(yīng)力級(jí)數(shù)解展開(kāi)至T應(yīng)力項(xiàng)確定的允許損傷尺度大于奇異項(xiàng)和展開(kāi)至三次高階項(xiàng)確定的允許損傷尺度,展開(kāi)至T應(yīng)力項(xiàng)確定的允許損傷尺度更接近試驗(yàn)值。
[Abstract]:In this paper, based on the concept of allowable damage scale, the crack tip strain field based on the first third order series is obtained by using the expansion of crack tip stress field in the form of William series, and then the analytical expression of allowable damage scale is derived considering the influence of stress relaxation. Taking the finite size concrete three-point bending beam specimen as an example, the allowable damage scale test value is compared with the theoretical value in this paper, and the variation law of the allowable damage scale of concrete corresponding to different orders is analyzed. The results show that the theoretical value of the allowable damage scale of concrete proposed in this paper is in good agreement with the experimental value. The allowable damage scale determined by the expansion of the stress series solution to the T stress term is larger than that determined by the singular term and the cubic higher order term, and the allowable damage scale determined by the expansion to the T stress term is closer to the experimental value.
【作者單位】： 河北工業(yè)大學(xué)土木與交通學(xué)院;清華大學(xué)水沙科學(xué)與水利水電工程國(guó)家重點(diǎn)實(shí)驗(yàn)室;華北水利水電大學(xué)土木與交通學(xué)院;
【基金】：國(guó)家自然科學(xué)基金項(xiàng)目(51309073,51209094) 清華大學(xué)水沙科學(xué)與水利水電工程國(guó)家重點(diǎn)實(shí)驗(yàn)室開(kāi)放基金項(xiàng)目(sklhse-2014-C-02) 高等學(xué)校博士學(xué)科點(diǎn)專(zhuān)項(xiàng)科研基金項(xiàng)目(20131317120012) 河北省自然科學(xué)基金青年基金項(xiàng)目(E2014202257) 河北省高等學(xué)校科學(xué)技術(shù)研究重點(diǎn)項(xiàng)目(ZD2015028)
【分類(lèi)號(hào)】：TU528

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