水工泄水建筑物振动安全评价方法研究

发布时间：2018-04-03 08:53

本文选题：水工泄水建筑物　切入点：结构安全　出处：《南昌大学》2014年硕士论文

【摘要】：对水工泄水建筑物进行振动安全评价，即测量出水工泄水建筑物的振动量（位移、速度、加速度）以后，如何判别振动对结构安全的影响，尽管国内外诸多学者根据多年的研究成果和经验积累，试图总结归纳针对水工泄水建筑物的安全评价标准，但到目前为止仍没有形成统一的标准。本文围绕水工泄水建筑物的振动安全评价，以三峡左导墙泄流激振实测和某闸墩振动动力测试为工程背景，采用总结归纳、对比分析、现场实测和数值模拟相结合的方法，从工程结构安全和舒适度两个方面比选出适合水工泄水建筑物的振动安全评价方法，并通过实际工程案例加以验证。 1、结构安全评价（1）在对现有的结构安全评价规范和指南进行研究比选的基础上，提出水工泄水建筑物结构安全综合评价法。该方法综合考虑优势频率、速度峰值、位移特征值因素，参照GB50868-2013《建筑工程容许振动标准》和建筑物高度的十万分之一作为“允许振幅”的标准，进行水工泄水建筑物结构安全评价。（2）采用MATLAB软件对三峡工程左导墙实测位移数据数据进行处理，绘制功率谱密度图并进行模态分析，并进行了振动安全评价，，明确了评价方法、评价步骤。 2、舒适度评价（1）将水工泄水建筑物振动的舒适度评价时常用的Meister感觉曲线、GB/T13921-92、BS6841-1987和GB/T13441.1-2007四个舒适度标准进行了详细的介绍，总结和比较了各自的适用范围和评价方法。（2）根据水工泄水建筑物流激振动常表现出低频振动的特点，振动的优势频率集中在基频。为使舒适度评价更加合理有效，1Hz为界限确定对应的舒适度评价标准。 3、以信江水利枢纽闸墩泄洪振动和某泄洪闸闸墩泄洪振动原型观测为例，利用MATLAB、ANSYS软件,和常用的模态识别方法，通过进行水工泄水建筑物振动安全评价，验证评价方法的有效性。
[Abstract]:The safety evaluation on the vibration of hydraulic engineering, vibration measuring hydraulic discharge structure (displacement, velocity, acceleration), how to determine the effect of vibration on the safety of the structure, although many scholars at home and abroad according to the research results and experience of many years of accumulation, trying to summarize the safety evaluation for hydraulic engineering standards. But so far there is no unified standard.
This paper focuses on vibration safety evaluation of hydraulic engineering, in the Three Gorges left guide wall discharge excitation test and a pier vibration test for the engineering background, the summary, comparative analysis, field measurement and numerical simulation method of combining the vibration safety evaluation method from the engineering structure safety and comfort than two choose the suitable hydraulic engineering, and verified by practical engineering case.
1, structural safety evaluation
(1) in the study of selection on the basis of the existing structure safety evaluation standards and guidelines, the comprehensive evaluation of the safety of building structure of water release method. This method takes into account the dominant frequency, peak velocity, displacement characteristic value factors, according to the GB50868-2013< standard construction allowable vibration > and the height of the building as a 1/100000 "allowed amplitude" the standard of hydraulic structure safety evaluation of buildings.
(2) using MATLAB software to process the measured displacement data of the left guide wall of the Three Gorges project, draw the power spectral density map and conduct modal analysis, and carry out the vibration safety assessment, and define the evaluation method and evaluation steps.
2, comfort evaluation
(1) the Meister comfort curves, GB/T13921-92, BS6841-1987 and GB/T13441.1-2007 four comfort standards used for comfort evaluation of hydraulic discharge structures are introduced in detail, and their respective application scopes and evaluation methods are summarized and compared.
(2) according to the characteristics of low frequency vibration, the dominant frequency of vibration is concentrated in the fundamental frequency. According to the vibration induced by logistics, the frequency of vibration is concentrated in the fundamental frequency. In order to make the comfort evaluation more reasonable and effective, 1Hz determines the corresponding comfort evaluation criteria for the boundary.
3, taking the prototype of the floodgate vibration of the Xinjiang water control project as an example, and a flood discharge gate pier flood discharge and vibration prototype observation as an example, the effectiveness of the evaluation method is verified by using MATLAB, ANSYS software and the commonly used modal identification method.

【学位授予单位】：南昌大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TV65;TV312

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