【作者】 马少波；

【导师】 朱军强；

【作者基本信息】 西安建筑科技大学 ， 防灾减灾工程及防护工程， 2011， 硕士

【摘要】 随着社会的发展,网壳结构的应用越来越广泛,但是在地震和风荷载作用下大跨结构的振动控制问题越来越突出与紧迫。压电材料具有正逆压电效应,可作为传感器和驱动器。在大跨空间钢结构中如何充分利用压电材料的压电效应进行主动控制已成为重要的研究热点。本文以网壳结构压电主动控制为目的,以压电主动控制杆件为研究对象,采用数值分析和试验研究的方法,进行了单层网壳结构有限元分析和模拟地震振动台试验研究,其主要研究工作如下:(1)应用有限元软件ANSYS12.0对9种单层凯威特网壳结构(跨度分别为30m,40m,50m;矢跨比为1:3,1:4,1:5)进行了有限元分析,推导了地震波量化处理的傅里叶变换,建立了定量分析计算模型,分析了在EL-Centro波、Taft波和兰州波三种地震波水平作用方向下的54种工况,得到了在地震作用下结构的振动响应规律和动力特性。(2)设计制作了一种主动杆件压电驱动器,获得了相应发明型实用型专利。本文通过对8根主动杆件压电驱动进行动态和驱动性能试验,研究了压电驱动器振动频率,探讨了影响驱动器性能的主要因素,分析了驱动电压与驱动力之间的增益关系。试验分析结果表明,压电驱动器振动频率为5~50HZ,驱动电压与驱动力增益为线性关系,可应用于土木工程结构的地震响应主动控制。(3)对含压电主动杆件的网壳结构进行了主动控制策略分析,推导了压电主动杆件的有限元方程,建立了含有压电主动杆件的单层凯威特网壳结构的有限元方程,引入了独立模态控制算法。结果表明,模态控制方法适用于网壳结构的压电主动控制。(4)设计并制作了含有压电主动杆件的单层K6型凯威特网壳模型结构,并进行了58种有控和无控工况数值分析和模拟地震振动台试验研究,对比分析了单层网壳结构主动控制的数值模拟和试验研究结果,探讨了压电主动杆件控制效果的主要影响因素。结果表明,压电主动杆件驱动器能有效抑制网壳结构的振动响应。通过本文研究表明,在土木工程中,充分利用压电材料优越的材料性能,在空间钢结构中合理应用主动控制策略,并利用压电类驱动器进行振动主动控制,对于解决大跨空间钢结构的振动问题、动力失稳问题具有重要的理论意义,其应用具有广泛的应用前景和工程实用价值。更多还原

【Abstract】 With the development of society, the latticed shell is applied more widely, so under the earthquake and wind loads, the vibration control problem of latticed shell has become more and more prominent and urgent.Piezoelectric material has the performance of the direct and converse piezoelectric effect ,. can be used as sensor and actuator. In long-span spacial steel structure how to make full use of piezoelectric materials active control of piezoelectric effect has already become an important research hotspot. In order to control vibration of the latticed shell by piezoelectric materials,a study is made on the finite element analysis and the shaking table test of the single layer latticed shell active vibration control by finite element analysis and vibrating table tests methods,the main research work is as follows:(1) The finite element analysis is done in the 9 kinds of single-layer kay witter latticed shell which has the span of 25m,35m,45m and the rise-to-span ratios of 1/3,1/4,1/5 by ANSYS12.0. Seismic wave is executed the quantifying analysis to seismic wave by fourier transformed in this paper and the model of quantitative analysis is also established. This paper analyzes the 54 species of conditions to horizontal earthquake effect of Lanzhou seismic waves, EL-Centro seismic waves and Taft seismic waves. Structure vibration response laws and dynamic characteristics are obtained.(2) Piezoelectric actuators active rods was designed and manufactured which has already obtained a invention practical patent.The dynamic and driving characteristic tests are carried on the 8 piezoelectric actuators , vibration frequency of piezoelectric actuators is analyzed,and the major factors of drive performance are discussed,and the relations between the driving voltage and the gain driving force are analyzed.The test results show that piezoelectric actuator has linear driving performance , with frequencies in the approximate range of 5 to 50 hertz,so it can applied to the active control in civil engineering structure(3) Piezoelectric active control strategies of single-layer spherical lattice shell is analyzed , and the finite element equations of Piezoelectric active rods are calculated.This paper establishes the finite element equations of the K8 single-layer spherical lattice shell which assemble piezoelectric active rods,and also introduces independent modal control algorithm. The results show that the modal control is applicable to the piezoelectric active control of the single-layer spherical lattice shell.(4) The K6 single-layer spherical lattice shell model which assemble piezoelectric active rods is designed and made. The numerical analysis and the earthquake simulating shaking table test are performed which contains 58 species conditions. The numerical simulation results and experimental results are analyzed,and the main influence factors on control effect of piezoelectric active rods is discussed. The results show that the piezoelectric drive can effectively restrain the vibration response of the single-layer kay witter latticed shell.This paper shows that making sufficiently used of piezoelectric materials superior properties, reasonable application of the active control strategies in the space steel and active vibration control by using piezoelectric class driver is important theoretical significance to resolve vibration and dynamic instability problems in long-span spacial steel structure. It is widly prospect of application and practical value.更多还原