对混凝土受压区采用轴向重复加载的应力-应变关系而不是反复加载的。
For concrete in compression zone a stress-strain relation for repeated axial compressive cyclic loading, is adopted instead of that for reversed loading.
可简单地通过估算截面高度或控制截面相对受压区高度的方法达到优化设计的目的。
It is simple and convenient to reach the aim of optimization design by estimating the depth of section and controlling the relative depth of the compression zone of the members.
结果表明，随横向刚度减小，截面受压区面积增大，隧道纵向等效刚度有效率减小；
The analytical results show that, as the transverse rigidity decreases, the area of compressive region increases and the longitudinal effective rigidity ratio decreases.
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