Remotely Collaborative Pseudo-Dynamic Testing For Bridges

With the development of remotely collaborative experiments, an effective method is provided for us to study the peformance of long span and large scale structures under earthquake excitations by testing. In the method, geographically distributed laboratories are combined by Internet and structures of large scale are tested by long-distanted control and collaboration. It enables the shared use of testing resources by integrating single structural laboratories into a powerful and netwoked laboratory with advanced capability. Sponsored by the National Natural Science Foundation under the National Key Project"The modern method and system for remote pseudo dynamic testing of structures under earthquake simulation"(50338020), the method for remotely collaborative hybrid dynamic testing of substructures and structural elements has been carried out. In this thesis, the method is applied to the structure of bridges and some aspects are studied, including the network communication, the issue of experiment results and the development of experiment platform, etc.The data exchange and communication are realized by the network communication platform NetSLab (Networked Structural laboratories) between the control centre and experiment sites. The network in domestic is complicated, in which Network Address Translators (NATs) and firewalls are commonly deployed. To solve this problem, two communication frames are offered in this thesis to provide across firewall communication. An on-line issue system is built, by which results of experiment can be shared on internet for more researchers in the world.In this thesis, the platform entitled NetSLab-SDOF ,which is developed for remotely collaborative pseudo-dynamic testing of single degree of freedom structures,is applyed to bridge structures which can be analyzed as a single degree of freedom system. A model bridge is tested successfully on Internet with this platform and the ability of NetSLab across firewall communication is proved. The reliability of the on-line issue system is also proved by issuing experiment results on Internet in real-time. The problems happened in the experiment, such as longer time cosumed in communication, are anaylized and some ways to solve these problems are offered.A platform for the multiple degrees of freedom structural system is developed. Two modules in the platform, the control centre and virtual tester, are developed with Visual Basic.Net language. The seismic response of Russian River bridge is collaboratively analyzed in different long-distanted sites by the control center program and the virtual tester program and the results are compared to those calculated by Opensees program.