It is indicated that apart from stiffness factor of beam to column, the ratio of depth to span and slop of roof greatly affect the stability performance of the portal frame under roof uniform loading.
研究表明，在均布荷载作用下，除了梁柱线刚度比，刚架高跨比及屋顶坡度对刚架的稳定性能影响很大。
2
At the same time, the stability of big-span tunnel with influence factor such as section size, high-spanratio and depth is studied.
同时，论述了大跨度隧道的稳定性以及断面尺寸、扁平率和隧道埋深对稳定性的影响。
3
It is suggested that the span-depthratio of wall-bearing transfer beam should be less than 8 in seismic design, 10 in static design for SRC structure.