声发射技术在混凝土空心板桥裂缝检测中的应用

发布时间：2018-02-14 09:10

本文关键词： 空心板桥混凝土结构裂缝声发射静载试验桥梁检测　出处：《桥梁建设》2017年05期 　论文类型：期刊论文

【摘要】：由于传统的裂缝检测方法效果差且不安全,提出采用声发射技术进行桥梁裂缝检测的方法。以驻马店练江河桥为背景,对其南边跨进行静载试验,利用声发射技术检测试验过程中混凝土空心板桥板底和铰缝处的裂缝扩展情况,研究声发射信号与裂缝扩展的对应关系。结果表明:试验过程中,混凝土空心板受力良好,没有出现宏观裂缝和结构性损伤,铰缝产生了较为严重的损伤;低幅值信号由微裂纹的扩展和旧裂缝断裂面的相互摩擦产生,高幅值信号由宏观裂缝的进一步扩展产生;声发射信号分析结果与桥梁实际病害一致,声发射技术应用于混凝土桥梁的裂缝检测具有较好的可行性。
[Abstract]:Because the traditional crack detection method is not effective and safe, a method of bridge crack detection using acoustic emission technology is put forward. Taking Zhumadian Lianjiang River Bridge as the background, the static load test is carried out on the south side of the bridge. The crack propagation at the bottom and hinged joints of concrete hollow slab bridge is detected by acoustic emission technique, and the corresponding relationship between acoustic emission signal and crack propagation is studied. The results show that the concrete hollow slab has a good force during the test. There is no macroscopic crack and structural damage, and the hinge joint produces more serious damage, the low amplitude signal is generated by the propagation of microcrack and the friction of old fracture surface, and the high amplitude signal is produced by the further expansion of macro crack. The results of acoustic emission signal analysis are consistent with the actual damage of the bridge. It is feasible to apply the acoustic emission technology to the crack detection of concrete bridge.
【作者单位】：郑州大学土木工程学院;
【基金】：国家自然科学基金项目(51208471,51778587) 河南省自然科学基金项目(162300410255) 河南省交通运输厅科技项目(2016Y2-2)~~
【分类号】：U446

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