... 复习 1.梁纯弯曲时横截面上的正应力分布规律和计算公式？ 3.梁纯弯曲时横截面上的最大正应力计算式？ 4.常见截面的Iz和Wz的计算公式？ 新课 一、梁弯曲时的正应力强度条件 1. 对于等截面梁，全梁的最大正应力一定出现在最大弯矩（Mmax）所在截面的上下边缘 处。 危险截面、危险点 2.
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计算结果表明，合理地选择吊点位置，能使最大弯矩峰值下降30%左右。
The analytical results show that the peak of maximum moment can decrease about 30% if the pickup points arrangement is reasonably chosen.
结果：同种异体松质骨愈合时的骨密度值、最大弯矩、平均骨小梁厚度逐渐上升。
Results: Bone mineral density, maximal bending moment and mean trabecular thickness of graft were found to have been increasing constantly.
从环板的平衡方程出发，应用奇异函数法计算其在最大弯矩极限条件下的极限荷载。
Based on the equilibrium equation of annular plates, the limit loads of annular plates under ultimate condition of the maximal moment were calculated by singular function.
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