学术
摘 要:
基于振动的结构健康检测,以其良好的应用前景,已成为目前工程界研究的热点。本文以某大型水电站导墙结构为研究背景,建立结构损伤评估流程体系;简要分析导墙裂缝的成因,根据现场实测的位移时程线运用随机减量技术和Prony方法对导墙模态参数进行识别,并与其它识别方法结果进行对比,研究表明导墙裂缝深度大约为导墙厚度的一半。对导墙进行裂缝模型的动力响应分析,对比发现,裂缝模型数值计算得到的动位移时程线与现场实测的动位移时程线拟合较好,进一步验证了裂缝模型与实际情况相一致,最后,对导墙进行安全评估和安全预警,研究表明该导墙满足安全要求并具有一定的安全余量。该损伤评估体系及识别方法对其他类似工程的健康诊断与评价具有一定的参考价值。[著者文摘]
文章出处:
《水力发电学报》-2008年27卷1期 -96-101页
分 类 号:
文献标识码:
A
Study on damage diagnosis of guide wall based on flood discharge response
LIAN Jijian, ZHANG Jianwei, WANG Haijun （ College of Civil Engineering, Tianjin University, Tianjin 300072）
Abstract:
Vibration-based health monitoring and damage diagnosis technique of structures now becomes a good research subject in the present structural engineering circle due to its promising prospects of application. The structural safety evaluation system is built up for a spillway guide wall which is the part of a large-scale hydropower station. The cause of crack is analyzed briefly. Study shows that the ratio of the depth of crack to the whole thickness of spillway guide wall is about 1/2 by virtue of random decrement technique and Prony method for modal analysis according to the displacement-time datum observed from the site. The result of identifying modal parameters is compared with other methods. Dynamic response of the structure with crack is done, and it is found contrastively that the displacement-time curve from model with crack is just in accordance with the results from the site. It proves the coherence between the model and the fact perfectly. Finally, this paper deals with safety evaluation and early-warning problem on the spillway guide wall, and study shows that the structure accords with the safe standard and has certain redundant safety. The damage diagnosis system and identification method have certain referenced value for other similar projects in healthy diagnosis and evaluation.[著者文摘]
Key words:
hydraulic structure; damage diagnosis ; modal analysis ; guide wall; random decrement technique; Prony method ; early-warning
基金资助:
国家自然科学基金（50538060,50679052）和国家杰出青年基金（50725929）
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