Development Of A Remotely Collaborative Pseudo-dynamic Testing Platform For Bridge Structures Considering Mutiple-support Excitation

Remotely collaborative pseudo-dynamic test can integrate laboratories in different place into a powerful and comprehensive laboratory by means of computer network technology. The combined laboratories can share the use of testing resources and complete complex tests which is difficult to single laboratory. Therefore a useful test method is applied to studies in the performance of long-span and large-scale structures under earthquake excitations. Many studies have shown that considering the effect on incoherent ground motion is more reasonable to spatial distributed bridges. In this thesis, pseudo-dynamic test for bridge subjected to multiple support excitation is investgated and a remotely collaborative pseudo-dynamic test platform for bridge is developed.(1)The necessity and significance of the research on bridge subjected to multiple-support excitation (MSE) is introduced. The NetSLab system is introduced in detail, including the data model, basic structure and the principle for developing the NetSLab.(2)On the basis of the MSE and studing on the calculation model of bridge, a program for nonlinear time-history analysis is developed. A three-span beam bridge subjected to multiple excitation is simulated in this program and SAP2000, the comparing result from which have testified the accuracy of the program. The necessity of considering multiple-support excitation is confirmed by comparing the time-history analysis result with uniform ground motion at the supports.(3)On the basis of communication platform of NetSLab, a remotely collaborative pseudo-dynamic test platform of bridge structure is developed. The method of remotely collaborative substructure pseudo-dynamic simulating the bridge structures subjected to multiple-support excitation is established based on the research of traditional sub-structure pseudo-dynamic test. Taking a beam bridge under incoherent ground motion for example, setting the pier and bearing respectively as test substructure, the stiffness matrix formation of substructure are derived, and the boundary condition are discussed. A series of geographically distributed virtual tests are conducted based on the developed test platform, the reliability of which is testified by comparing the results of virtual tests with the results of nonlinear time-history analysis.(4)The further improvement and application of the testing platform is discussed, as well as future research work of remotely hybrid testing method.