预应力锚固结构外露段动力特性研究

发布时间：2018-01-06 07:21

本文关键词：预应力锚固结构外露段动力特性研究　出处：《湖南科技大学》2013年硕士论文　论文类型：学位论文

【摘要】：预应力锚固结构因其先进性、可靠性广泛应用于桥梁、岩土等大型工程中。然而它在使用中存在预应力损失过大或失效的问题，发生了很多工程事故，造成了很多生命和经济损失。为避免结构发生事故，提高工程安全性,需要一种有效的检测方法和相应的测试技术规程来解决这一问题。本文主要研究工作及成果如下：本文根据预应力锚固结构的工作原理，视锚具、锚杆为一个广义质量，锚具与锚垫板接触面视为切向刚度为k的弹簧相联结（锚垫板为参考点），形成一个广义质量-弹簧的单自由度振动模型。在实验室建立预应力简支梁试验模型，将精轧螺纹钢筋从5吨逐级加载至45吨（每级5吨）。钢筋在不同等级预应力下，使用千斤顶对螺母施加不同大小的横向荷载，并用百分表测量螺母的位移，分析横向荷载与位移的关系，从而证明简化成单自由度振动模型的可行性。基于接触面切向刚度与法向力存在对应关系，通过在锚具切向施加激励F(t),在相对应位置安装加速度传感器接受激励产生的相应振动信号，信号采集分析仪获取输入、输出信号。分别用最小二乘参数辨识法、遗传算法参数辨识法、神经网络参数辨识法，根据其输入、输出动力信号识别接触面切向刚度k，建立锚具张拉力与刚度k的对应关系。获取切向动刚度k的参数识别最优分析程序，提出预应力锚固结构张拉力的测试方法。为集成研制不同类型的预应力锚固结构张拉力测试仪和编制适用不同行业的预应力锚固结构张拉力测试技术规程提供参考。一旦在全国推广应用，将彻底改变我国预应力锚固结构张拉力无定量测试的状态，，提高施工的可靠度,达到彻底地解决预应力锚固结构预应力损失过大和失效的问题，对提高预应力锚固结构的耐久性和可靠性、安全与稳定性，避免重大工程事故具有重要的技术经济意义。
[Abstract]:Prestressed Anchorage structure is widely used in bridges, geotechnical engineering and other large-scale projects because of its advanced nature and reliability. However, it has the problem of excessive loss or failure of prestressing force in use, and many engineering accidents have occurred. It has caused a lot of life and economic losses. In order to avoid structural accidents and improve the safety of the project. It is necessary to solve this problem with an effective detection method and corresponding testing technical procedures. The main work and results of this paper are as follows: According to the working principle of prestressed anchoring structure, the anchor rod is regarded as a generalized mass, and the contact surface between anchor and anchor plate is regarded as a spring with tangential stiffness k (anchor plate as reference point). A single degree of freedom vibration model of the generalized mass-spring is formed and the experimental model of simply supported prestressed beam is established in the laboratory. The finished rolled rebar is loaded from 5 tons to 45 tons (5 tons per grade). Under the different grade of prestress, the reinforcing bar exerts different transverse loads on the nut with Jack, and the displacement of nut is measured with a percentile meter. The relationship between transverse load and displacement is analyzed, and the feasibility of simplifying to a single degree of freedom vibration model is proved. Based on the relationship between tangential stiffness of contact surface and normal force, the acceleration sensor is installed in the corresponding position to receive the corresponding vibration signal by applying the excitation to the Anchorage in the tangential direction. The input and output signals are obtained by the signal acquisition analyzer. The least square parameter identification method, the genetic algorithm parameter identification method, and the neural network parameter identification method are used according to their input. The output dynamic signal identifies the tangential stiffness k of the contact surface and establishes the corresponding relationship between the tensile force and the stiffness k of the anchor. The optimal program for parameter identification of the tangential dynamic stiffness k is obtained. The test method of tensioning force of prestressed Anchorage structure is put forward in this paper. It provides a reference for developing different kinds of prestressed Anchorage structure tensioning force tester and compiling the technical specification for tensioning test of prestressed Anchorage structure suitable for different industries. Once popularized in the whole country. In order to solve the problem of excessive loss and failure of prestressed Anchorage structure, the tension of prestressed Anchorage structure in our country will be completely changed without quantitative testing, and the reliability of construction will be improved. It is of great technical and economic significance to improve the durability, reliability, safety and stability of prestressed Anchorage structure and to avoid major engineering accidents.
【学位授予单位】：湖南科技大学
【学位级别】：硕士
【学位授予年份】：2013
【分类号】：TU311.3

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