| 童谷生*,徐鹏华,陈莘莘.利用有限断裂力学方法对含尖锐V型切口混凝土试件的三点弯曲试验研究[J].实验力学,2018,33(2):253~262 |
| 利用有限断裂力学方法对含尖锐V型切口混凝土试件的三点弯曲试验研究 |
| Three-point bending experimental study of concrete specimen with sharp V-notch based on finite fracture mechanics method |
| 投稿时间：2016-10-19 修订日期：2017-01-13 |
| DOI：10.7520/1001-4888-16-215 |
| 中文关键词: 脆性指数 V型切口 破坏荷载 有限断裂力学 混凝土 |
| 英文关键词:brittleness index V-notch failure load finite fracture mechanics concrete |
| 基金项目:国家自科学基金项目(11462005， 11242006)资助 |
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| 中文摘要: |
| 为研究含V型切口素混凝土梁在三点弯曲情况下的断裂特性，本文引入了一种耦合应力与能量的有限断裂力学分析方法，分析推导随V型切口开口角度变化，对有限距离及广义断裂韧度影响的广义应力强度因子解析表达式。广义断裂韧度及有限距离采用断裂韧度及抗拉强度及开口角度的函数来表示。通过三种缝高比包含几种开口角度素混凝土的三点弯曲试验的结果表明，与平均应力准则相比，有限断裂力学方法预测破坏荷载有更高精度，同时理论值与试验结果吻合程度也更好。 |
| 英文摘要: |
| In order to study the fracture characteristics of plain concrete beam with V-notch subjected to three-point bending, a finite fracture mechanics method, which has coupled stress and energy, is introduced in this paper to derive an analytical expression of generalized stress intensity factor, which can analyze the effect of V-notch opening angle variation on the finite distance and generalized fracture toughness. Generalized fracture toughness and finite distance are expressed by functions of fracture toughness, tensile strength and V-notch opening angle. Results from three-point bending experiment for plain concrete beams with 3 crack-height ratios and several opening angles indicate that comparing with average stress criterion, the predicted failure load by using finite fracture mechanics method has higher precision, at the same time, the agreement with experimental data is better. |
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