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网壳(空间桁架)用广义矩阵位移法能得到精确解,但要解高阶矩阵。荷载分配法属精度很高的近似方法。本文即采用此法讨论网壳在静荷温度变化作用下的内力及整体稳定的计算。为避免网壳整体失稳,应加强哪些杆件,在判断上有困难。增加每一根杆件的截面,显然不经济。荷载分配法能很好地处理此问题,对实际应用很有意义。
The reticulated shell (space truss) can be solved exactly by the generalized matrix displacement method, but the higher-order matrix is solved. Load distribution method is a very accurate approximation method. This paper uses this method to discuss the internal force of the reticulated shell under the effect of static temperature change and the overall stability calculation. In order to avoid the overall instability of the shell, which rods should be strengthened, there are difficulties in the judgment. Increasing the section of each bar is obviously not economical. The load distribution method can deal with this problem well and it is meaningful for practical applications.