1 Jiangsu Key Laboratory of Environmental Impact and Structural Safety in Civil Engineering, China University of Mining and Technology，Xuzhou,221116，China ；
2 State Key Laboratory for Geomechanics & Deep Underground Engineering ，Xuzhou ,221006,China;
Abstract：In the test model of grid structure, experiment on progressive collapse of structure on account of the member failure has been carried out, in which member importance evaluation method based on member axial force and the response to strain energy change has been adopted to determine the initial failure member and a manually controlled failure apparatus has been installed. During the model test, by using dynamic strain meter, guyed displacement and acceleration sensor, the response on the whole in the dynamic process triggered by the initial failure, the time history curves of the displacement and acceleration could be obtained, which would reveal the collapse process and mechanism. The numerical simulation analysis and test results show that some members between bearings and adjacent members of grid structure are key ones which will cause the progressive collapse of the grid structure after their initial failure so in the actual design, it is necessary to strengthen their bearing capacities.
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