有限尺寸混凝土试件允许损伤尺度的解析研究

发布时间：2019-05-19 22:02

【摘要】：该文基于允许损伤尺度的概念,应用William级数形式的裂缝尖端应力场展开式,获得基于前三阶级数的裂尖应变场,进而考虑应力松弛的影响,推导了允许损伤尺度的解析表达式。以有限尺寸的混凝土三点弯曲梁试件为例,将允许损伤尺度试验值与该文理论值进行比较分析,分析了不同阶数对应的混凝土允许损伤尺度的变化规律。结果表明:该文所提的混凝土允许损伤尺度的理论值与试验值吻合较好;应力级数解展开至T应力项确定的允许损伤尺度大于奇异项和展开至三次高阶项确定的允许损伤尺度,展开至T应力项确定的允许损伤尺度更接近试验值。
[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.
【作者单位】：河北工业大学土木与交通学院;清华大学水沙科学与水利水电工程国家重点实验室;华北水利水电大学土木与交通学院;
【基金】：国家自然科学基金项目(51309073,51209094) 清华大学水沙科学与水利水电工程国家重点实验室开放基金项目(sklhse-2014-C-02) 高等学校博士学科点专项科研基金项目(20131317120012) 河北省自然科学基金青年基金项目(E2014202257) 河北省高等学校科学技术研究重点项目(ZD2015028)
【分类号】：TU528

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