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把柔性结构的非线性有限元找形方法进行改造将其应用于网壳结构,提出网壳结构的非线性有限元找形方法,并通过算例研究了该方法的精度和适用性.研究表明,该方法不存在优化结果受限于预先设定的构件刚度的问题,而且可以使荷载随构形更新实现荷载的准确施加;可以实现高精度的找形求解,应用时应注意荷载宜基于迭代1次所得新构形确定、初应力分布宜随构形更新调整、弹性模量宜降低到真实弹模的1/500到1/1000.本文方法未对网壳类型和荷载形式作出限制,可解决各类网壳在不同类型荷载作用下的找形问题.
The nonlinear FEM Finding method of flexible structure was modified to be applied to the reticulated shell structure, and the non-linear Finite Element Finding method for the reticulated shell structure was put forward. The accuracy and applicability of the method were studied by an example. , This method does not exist the problem that the optimization result is limited to the pre-set stiffness of the member, and the load can be updated with the shape to achieve the accurate application of load. The high-precision finding of the shape can be realized. The application should pay attention to the load should be based on iteration Once the new configuration is obtained, the distribution of initial stress should be adjusted with the configuration renewal, and the elastic modulus should be reduced to 1/500 to 1/1000 of the real model. The method of this paper does not limit the types and load forms of the reticulated shell Solve the various types of grid shell in the role of different types of load-finding problems.