For modal analysis of large structures, it is unpractical and expensive to use artificial excitation (e.g., shakers). However, engineering structures are most often subject to ambient loads (e.g., traffic and wind) that can be exploited for modal parameter estimation. One difficulty is that the actual loading conditions cannot generally be measured, and output-only measurements are available. T...

INTRODUCTION This paper is about a new method for vibration modal analysis, which is called the smooth orthogonal decomposition (SOD) based modal analysis method. The proper orthogonal decomposition (POD) based modal analysis method, which was first proposed by Feeny et.al in 1998, indicates an exciting method for extracting the modal shapes of a vibration system by using only the output displa...

Abstract: Modal analysis is a powerful technique for understanding the behavior and performance of structures. Modal analysis can be conducted via artificial excitation, e.g. shaker or instrument hammer excitation. Input force and output responses are measured. That is normally referred to as experimental modal analysis (EMA). EMA consists of three steps: data acquisition, system identificatio...

In this study, a rapid-to-deploy wireless monitoring system is utilized to monitor the vibration response of the 180 meter long Yeondae Bridge, Korea. The bridge consists of a steel box girder section that continuously spans across five supports. Using 20 wireless sensors with MEMS accelerometers interfaced, the wireless monitoring system is installed to measure the bridge response to truck tra...

Decades ago, a major concern of structural engineers was the development and application of new and powerful numerical methods for the static and dynamic analysis of large civil engineering structures. The rapid development of finite-element techniques accompanied by tremendous technological progress in the field of personal computers allowed structural designers to use software packages for ac...

Wireless sensing technology has made it possible to instrument large civil structures, such as bridges, with dense networks of wireless sensors. Because many wireless sensing platforms integrate data processing capabilities with high-precision analog-to-digital converters, it is possible to autonomously process sensor data without the need for a central data server. By employing parallel proces...