模拟结果表明：支架在膨胀过程中出现轴向缩短，且轴向缩短率随径向加载位移的增大而增大。
The simulations show that the length of the stent decreases fast with increasing displacement in the radial direction during the expansion.
如果该结构为弹性，那么在加载和卸载时力位移曲线遵循相同的迹线。
If the structure is elastic the force-displacement curve follows the same path on loading and unloading.
推倒分析中的关键是加载模式的选取和目标位移的求取。
The key of push-over analysis method is load pattern and target displacement.
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