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本文对格构式变截面吊臂金属结构的临界力计算作了理论分析。变截面压杆的临界力不但和构件变截面有关,而且和构件的支承情况有关。本文分析了一端固定、一端自由和两端铰接的格构式变截面压杆,说明这种形式的变截面压杆可化成相当的等截面压杆进行计算,但必须引入变截面长度系数μ_1。μ_1的计算公式可从变截面压杆的临界力和相当的等截面压杆的临界力比较而得。
This paper makes a theoretical analysis of the critical force calculation for lattice-type variable-section boom metal structures. The critical force of variable cross-section bar is not only related to the variable cross-section of the component, but also related to the supporting condition of the component. In this paper, the lattice variable cross-section bar with one end fixed, one end free, and both ends hinged is analyzed. This shows that this type of variable cross-section bar can be calculated into a fairly equal section bar, but the variable section length coefficient μ_1 must be introduced. The formula of μ_1 can be obtained from the comparison of the critical force of the variable cross-section rod and the equivalent critical force of the equal cross-section press rod.