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该文研究了非等高的双重抗侧力体系的稳定性。首先,分析了弯曲型高-剪切型低的双重抗侧力体系,提出了该结构体系的屈曲方程及稳定临界荷载解析解。通过分析弯曲型高-剪切型低的双重抗侧力体系的上下两部分存在相互支援作用,给出了求解该体系稳定临界荷载的近似公式,通过算例对比,发现与解析解相比,近似解具有很好的精度;同时,近似法便于实际应用。其次,研究了剪切型高-弯曲型低的双重抗侧力体系稳定性,研究发现由于轴压力分布的不同,此类体系将出现两种不同形式的失稳模式,分别为结构上部发生纯剪切型失稳的局部失稳模式以及结构下部发生整体有侧移失稳模式。提出了判别结构在某一特定形式的荷载作用下,发生哪一种失稳模式的准则,以及相应的临界荷载计算公式。
In this paper, we study the stability of non-equal dual anti-lateral force system. First, the bending-type high shear-low dual anti-lateral force system is analyzed, and the buckling equation and analytical solution of the stability critical load of the structural system are proposed. By analyzing the interaction between the upper and lower parts of the curved high-shear low dual anti-lateral force system, an approximate formula for solving the critical stability load of the system is given. By comparing the experimental results with the analytical solutions, The approximate solution has good accuracy; meanwhile, the approximation method is convenient for practical application. Secondly, we study the stability of shear-type high-bending low double anti-lateral force system. It is found that there are two different types of instability modes of such systems due to the different axial pressure distribution, The shear instability partial instability mode and the overall lower part of the structure have a lateral slip instability mode. A criterion for determining which instability mode occurs under a particular type of load and the corresponding formula for calculating the critical load are proposed.