重力坝在受到外力作用时,坝体任一横剖面里每点的周围都产生应力,这些应力的分量随方向角的变化而变化,其中变到极值的应力有二,称为第一和第二主应力。主应力的方向及数量随点的位置而异。连接主应力的方向可得两组互成直角的轨迹并结成一个主应力网。 利用有限元法,我们可借助电子计算机求算出这两组主应力及轨迹,供设计重力坝 When the gravity dam is subjected to external forces, stress is generated around each point in any cross section of the dam. The components of these stresses vary with the change of the steering angle, and the stress that reaches the extreme value is two, which is called the first sum The second main stress. The direction and amount of the principal stress vary with the location of the point. The direction of the principal stress connection gives two sets of mutually perpendicular trajectories and forms a main stress network. Using finite element method, we can calculate these two sets of principal stress and trajectory by means of electronic computer for designing gravity dam