通过非线性振动中常用的里兹-伽辽金法，推出了两端铰支压杆大挠度问题的一个新近似公式，计算结果表明具有较高的精度。
A new approximate formula for the large deflection problem of compression bar with two ends are simply supported is obtained, by the use of Ritz-Galerkin method.
球铰的温度高，热应力大，容易发生失效。
Failure may happen in ball joint which suffers high temperature and stress.
传统的抗风柱计算模型为上端不动铰，即认为厂房纵向刚度为无穷大。
For the traditional calculation model of wind column, the top is fixed hinge. It means that the longitudinal stiffness of workshop is infinite.
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