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一、钢结构设计规范TJ17-74 中偏压验算公式的缺点规范TJ17-74采用下式σ=N/(φpA)≤[σ](1)验算偏压构件在弯曲平面内的稳定。制定规范时采用图1所示的三种典型截面,按耶硕克近似方法分别计算出这三种典型截面在不同长细比和偏心率下的临界应力,并制定出三种φp值表。非典型截面,则按构件受弯时塑性发展的近似程度,分别归类到其中一种典型截面,查相应的φp表。
A. Disadvantages of the bias voltage checking formula in the steel structural design specification TJ17-74 The specification TJ17-74 uses the following formula σ=N/(φpA) ≤ [σ] (1) to check the stability of the biasing member in the bending plane. The three typical cross-sections shown in Figure 1 were used to develop the specifications. The critical stresses of the three typical cross-sections under different slenderness ratios and eccentricities were calculated according to the Jesock approximation method, and three φp-value tables were developed. For atypical sections, the approximate degree of plastic development when the members are bent is categorized into one of the typical sections, and the corresponding φp table is checked.