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混凝土楔入劈拉试件双K断裂参数叠加计算及其边界效应

期刊名称：大连理工大学学报，2006，46（6）：868-874.
时间：0
分类：O157.5[理学—数学;理学—基础数学] TU375.4[建筑科学—结构工程]
作者机构：[1]Civil Engineering Institute, Faculty of Infrastructure Engineering, Dalian University of Technology, Dalian 116023, China, [2]The Communications Research Institute of Liaoning Province, Shenyang 110015, China, [3]Department of Civil and Structural Engineering, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong, China
相关基金：Project（50438010） supported by the Key Program of the National Natural Science Foundation of China; Project（JGZXJJ2006-13） supported by the Research and Application Programs of Key Technologies for Major Constructions in the South-North Water Transfer Project Construction in China
相关项目：混凝土结构裂缝的形成与发展机理及控制技术研究

关键词：混凝土抗压强度, 裂纹尖端张开位移, 强度实验, 临界, FBG传感器, 光纤布拉格光栅, 实验测量, 分析公式, critical crack tip opening displacement （CTODo）, fiber Bragg grating （FBG） sensors, three-point bending （TPB） tests, wedge splitting （WS） tests, high strength, concrete

中文摘要：

用有从 30 直到 150 MPa 的七不同压缩力量的试验性、分析的评估的水泥的批评裂缝尖端洞排水量(CTODc ) 基于破裂测试的二种类型被学习：三点的弯曲(TPB ) 并且切开的楔(WS ) 。在测试， CTODc 的价值试验性地用一篇小说被记录技术，在纤维，布拉格栅栏(FBG ) 传感器被使用，和二种传统的技术，紧张在计量和片断计量器被部署。测试水泥的 CTODc 的价值也用 JENQ 与 SHAH 和徐分别地建议的二个存在分析公式被预言。当具体增加的压缩力量，和采用的测试几何学几乎没在 CTODc 的价值上有很少影响，试验性的大小和分析公式获得的 CTODc 的价值展出一个可以忽略的变化，这被发现当具体增加的压缩力量，和采用的测试几何学几乎没在 CTODc 的价值上有很少影响。关于 CTODc 的试验性的测量，片断计量器方法通常导致 CTODc 的更大的值并且显示出更多重要作为与另外的二个方法相比散布，当紧张计量器方法作为与 FBG 传感器方法相比导致稍微更低的 CTODc 时。分析公式由 JENQ 求婚了， SHAH 被发现通常导致 overestimation，当徐建议的分析公式显示出好精确性时。

英文摘要：

Critical crack tip opening displacement （CTODc） of concrete using experimental and analytical evaluation with seven different compressive strengths ranging from 30 up to 150 MPa was studied based on two types of fracture tests： three-point bending （TPB） and wedge splitting （WS）. In the tests, the values of CTODc were experimentally recorded using a novel technique, in which fiber Bragg grating （FBG） sensors were used, and two traditional techniques, in which strain gauges and clip gauges were deployed. The values of CTODc of tested concrete were also predicted using two existing analytical formulae proposed by JENQ ＆ SHAH and XU, respectively. It is found that the values of CTODc obtained by both experimental measurements and analytical formulae exhibit a negligible variation as the compressive strength of concrete increases, and the test geometry adopted has little impact on the value of CTODc. Regarding the experimental measurement of CTODc, the clip gauge method generally leads to a larger value of CTODc and shows a more significant scatter as compared with the other two methods, while the strain gauge method leads to a slightly lower CTODc as compared with the FBG sensor method. The analytical formula proposed by JENQ and SHAH is found to generally lead to an overestimation, while the analytical formula proposed by XU shows a good accuracy.

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