摘要
佛子岭大坝是一座结构复杂的连拱坝,坝址地震基本烈度为7度,设防烈度为8度.2000年8月,对佛子岭连拱坝进行了原型动力试验,取得了大坝的动力特性,即频率、振型、阻尼比和传递函数.此次原型试验采用爆破、起振机、随机脉动三种试验手段,先后进行了坝顶动力试验和#11支墩的动力试验.试验结束后,利用起振机激振的试验数据和快速傅立叶变换(FFT)的方法,得到传递函数的试验值,同时根据理论推导的传递函数,在频域应用由最小二乘迭代法编制的阻尼最小二乘法识别程序,选择目标函数进行优化计算,得到了解耦的佛子岭连拱坝的模态参数值,可以作为该坝抗震加固计算的依据.
The Fuziling multi-arch dam is located in a moderately active seismic zone,where the design earthquake intensity is VIII.The dam structure is very complicated.In situ dynamic test was carried out on the whole dam blocks and on the block No.11of Fuziling multi-arch dam successively in August,2002,and some dynamic parameters of the dam,such as frequency,modes of vibration,damping ratio and transfer functions were gotten.In this test,three methods were used to measure the vibration properties of the dam.They were methods of rotating mass shaker,explosion and ambient vibration respectively.Then,by analyzing the measured data with method of Fast Fourier Transform,the transfer functions were obtained.Based on the non-linear optimization theory with damping least squares,one new modal parameter identification program was developed,which was used to fit the measured transfer functions to mathematical expressions.In this way,we got the uncoupled modal parameters of Fuziling multi-arch dam,which will work as the basis of seismic calculation and consolida-tion.
出处
《水利水电技术》
CSCD
北大核心
2002年第12期58-60,共3页
Water Resources and Hydropower Engineering
基金
国家自然科学基金资助项目(50079030).
关键词
佛子岭连拱坝
动力试验
模态参数识别
传递函数
阻尼最小二乘法
Fuziling multi-arch dam
dynamic test
modal parameter identification
transfer function
damping least squares method
