The Research Of Velocity Response About Ancient Building Timber Structure Under Traffic Excitation

As an important part of Chinese civilization,Chinese ancient architecture is not only an important cultural relics,but also takes an important role with a high cultural,historical,artistic and scientific value.Now in addition to wind and snow erosion factors,earthquake and poor maintenance and other aspects of the cause of ancient buildings damaged in different degrees,ground traffic vibration has become the ancient architecture of the "invisible killer".Although the evaluation standard is based on the particle velocity or acceleration.There are many different ways to determine the quantity of evaluation.Based on the national key cultural relics under the state protection of Guangyue Tower,field vibration monitoring of engineering building,according to the vibration data of the field test,and combining with the knowledge of probability and statistics that Guangyue Tower timberwork in accordance with the actual situation of the traffic speed vibration response value method.The main research contents are as follows:(1)The field monitoring of traffic excitation Guangyue Tower for data collection;using Matlab software filters,smooths and eliminates the trend to get more in line with the actual data.At the same time,analysis and comparison of the Vibration Engineering Department of timberwork of each layer top upstairs.(2)Through the analysis of the test data,according with the vibration theory in time domain,the measuring point velocity amplitude were analyzed by statistical methods,the approximate normal distribution,using the knowledge of probability and statistics can be drawn confidence as the velocity amplitude statistical method 95%,compared with the measured data error,and then drawn the speed value method the reaction characteristics of traffic vibration can be better.(3)Based on the “Technical specifications for protection of historic buildings againstman-made vibration” that allows the roof floor engineering industry the horizontal vibration velocity value,according to the top-level specification of the relevant provisions of top speed were obtained under the top top speed data and 95% amplitude statistical data confidence.The measured results of Guangyue tower that found the permissible value of the measured data or 95% confidence degree of the amplitude statistics results are greater than the standard,namely China in the test floor in an unsafe condition after safety evaluation.