以下为句子列表：
英文: Based on the conception that the simple beam rotates rigidly around the plastic hinge in the middle when the beam is at the ultimate state of anti-bending capacity, the formula for calculating the stress in the external tendons and the ultimate anti-bendi
中文: 摘要在承载能力极限状态下，可把简支梁的跨中区段视为1个等曲率塑性铰（塑性区段），其余梁段可视为直线并处于绕塑性铰刚性转动的位置。
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