Collaborative Pseudo Dynamic Test on Buildings with New Column Bases Using Distributed Loading System

Abstract eng:
One of authors has proposed a scheme for Internet-based collaborative structural analysis (CSA) in which many researchers worldwide can collaborate and unify their different programs and structural models. The distributed loading system enables us to simulate the variation of rotational stiffness and bending moment carrying capacity of column bases and can be operated remotely through the Internet. Hence, the technique of Internet-based structural analysis is used to perform a collaborative pseudo dynamic test on a building frame with an exposed column base. We have also proposed a non-slip-type exposed column base with wedge devices, which shows non-slip-type restoring force characteristics. Slip does not take place and the load in the loading cycles builds up from the origin. To verify the performance of the distributed loading system and newly proposed column-bases, pseudo dynamic tests were performed on a 5-story 2-bay steel frame building with the proposed column bases. The structure was split into analytical substructures and experimental substructures. The experimental substructures were the exterior column's base or the interior column's base, and the other columns, beams, slab, column bases and external forces are simulated as analytical substructures. The test series was an elasto-plastic pseudo-dynamic test in which the maximum ground velocity of the earthquake motion was set to 50kine and the experimental substructure was a column base of an interior column. The column bases were conventional column bases and non-slip-type column bases. The excitation was given twice continuously. From these test results, the following conclusions are drawn. 1) The maximum base plate rotation response of the non-slip-type column base was less than 10% of that of the conventional column base under severe earthquake. 2) For a conventional column base, the maximum story drift of the second excitation was 15% larger than that of the first excitation. However, for a non-slip-type column base, almost all responses were the same except for the initial elastic responses. 3) Hence, a non-slip-type column base has high self-rehabilitation and its structural characteristics remain unchanged after a severe earthquake. Furthermore, it is maintenance free because its structural characteristics were unchanged after two severe earthquakes.

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