Secondly, the least length of pretensioned prestressed concrete slab is defined to make the full use of steel strand strength and avoid flexural crack occurs within the development length.
其次为使构件破坏时充分发挥预应力钢绞线的强度，防止弯曲裂缝出现在延伸长度之内，提出了先张预应力混凝土板在均布荷载作用下的最小板长。
The development and evolution of the slope-breaks are episodic and successive: in early period, it is faulted slope-break; in later period, it is flexural slope-break.
坡折带的发育演化具有明显的阶段性和继承性：早期为断裂坡折带，晚期为挠曲坡折带。
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