Development of an Intelligent Sub-structuring Loading-test System for Large-scale Frames

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1. An intelligent loading-test system was developed by using hybrid sub-structuring technique. This system provides a useful tool to investigate the inelastic behaviors of large-scale frame.2. Three types of flexible steel frame models were supposed, and they were tested by using the developed test system. The reliability of the system was checked too.3. One of the characteristics of flexible frames is that the moment gradient along the column. A special test device is designed is changeable. A special test device used to test the columns under such a stress condition was designed.4. The procedure of removal of the unbalanced forces produced during test was proposed. Four different predictors were tried during the tests and the results were compared after tests. (1) The simple predictor with the shortest time-consuming is elastic beam-column model ; however the effect to remove unbalanced force is not so good as the other models. (2) Multi-spring inelastic beam-column predictor makes unbalanced forces minimized but with the longest demand of time. An alternative is the use of a two-component bilinear model. (4) Neural network predictor is first tried in on-line test.