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中心支撑结构是目前较为常见的一种普通框架支撑结构体系,但其与梁柱对中时容易产生偏差,使得梁段局部产生较大的剪力而发生剪切破坏。与中心支撑结构相比,偏心支撑结构的耗能段解决了对中问题,适用于大跨结构,且可有效降低结构体系在罕遇地震下的反应,耗能段的变形可以吸收一部分能量,在塑性阶段更好地保护主体。从层间角度出发,通过拟静力试验对比防屈曲中心支撑框架和防屈曲偏心支撑框架结构的滞回曲线、骨架曲线、刚度退化等在不同层间的区别,研究耗能梁段对于防屈曲偏心支撑框架结构的抗震性能影响。研究结果表明:相对于中心支撑,偏心支撑不仅适用范围更广,更有利于提高结构的抗震性能,保护主体结构,延长结构抗震持时,有利于结构的防连续倒塌。
The center support structure is a kind of ordinary frame supporting structure system which is common nowadays. However, it is prone to deviate when it is aligned with the beam column, so that a large shear force locally occurs in the beam section and shear failure occurs. Compared with the central supporting structure, the energy dissipating section of the eccentric supporting structure solves the centering problem and is suitable for the long-span structure, and can effectively reduce the structural system reaction under rare earthquakes. The deformation of the energy dissipating section can absorb a part of energy, In the plastic stage to better protect the subject. From the perspective of interlayer, this paper compares the difference in hysteresis curves, skeleton curves and stiffness degeneration between the buckling center support frame and the anti-buckling eccentric support frame structure through quasi-static test, Seismic behavior of eccentric supporting frame structure. The results show that the eccentric support is not only applicable to a wider range than the central support, but also conducive to improving the seismic performance of the structure, protecting the main structure and prolonging the seismic resistance of the structure.