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| An analysis method for elastoplastic calculation of knee bracing frame |
| Revised:June 04, 2003 |
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| DOI：10.7511/jslx20053072 |
| KeyWord:steel frame,knee bracing frame,elastoplastic analysis |
| LI Qing-song HUANG Zhen CHEN Long-zhu~* |
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| Abstract: |
| An analysis method is presented for the determination of the elastoplastic behaviour of a new structural system, named knee bracing frame. Different from the moment-resisting and concentrically braced frames, the knee bracing frame combines excellent ductility and lateral stiffness by setting the diagonal brace to a knee element instead of beam-column joint. Through the flexural yielding of the knee element under a severe earthquake, the structure could dissipate most of the input energy. No damage would occur to the main structural members and the rehabilitation could be very easy and not costly. However, despite its favorable features, this new system had not been widely used since its presentation. One difficulty that stops it from wide application is the complex nonlinear analysis. To make a simplification, a mathematical analysis model is formulated by combining use of the finite element method (FEM) and the plastic hinge theories. With this model, no iteration is involved in the solving procedure and only a few simple calculations are needed. In the end, examples are presented, which show that by using the analysis model, an easier and faster calculation could be expected, and the results are stable and reliable and consistent with the results of FEM. |
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