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Effect of Conection Semi-rigidity on Seismic Response of Prstressed Precast Concrete Frames

Cai Xiao-ning;Meng Shao-ping;School of Civil Engineering,Huai Hai Institute of Technology;Key Laboratory of Concrete &Prestressed Concrete Structures of Ministry of Education,Southeast University;  
The connections of the prestressed precast concrete( simplified as PTED) frame are typical semi-rigid connections. The rotational stiffness of the connections has great impact on the elasto-plastic performance of the PTED frame. The fixity factors defined for the PTED connections are used as variables in the analytical investigation and the theoretical expressions of the fixity factors are presented. The tests of the PTED connections and the numerical analysis of the PTED frames are carried out and the impacts of the rotational stiffness on the elasto-plastic performances of the PTED frame are studied. The results show that: if the rotational stiffness decreases,the maximum vertex displacement increases and the maximum base shear reduces under the lateral loads,but the overall behaviors are not significantly different; the moment distributions of the beam span transform from the negative moment to the positive moment under vertical loads. It may be necessary to consider the connection rigidity as a design parameter.
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