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结构专业,尤其钢结构的规范中经常提到弯矩作用平面内,弯矩作用平面外的表述,很多人其实并不清楚其真正的概念。造成构件失稳的主要原因是在荷载的作用下产生弯扭做用,该作用是和构件的长细比,截面形状等因素有关的,确定很复杂,目前规范给出的都是荷载试验统计的稳定系数法。为了防止平面外失稳,我们通常要在平面外加支撑,因为主要是防止构件扭曲,本文主要论述弯矩作用平面的概念与抗扭计算相关问题分析。
Structural professional, in particular, often referred to in the specification of steel structure Plane bending moment, bending moment Plane outside the statement, many people actually do not know its true concept. The main cause of the destabilization of components is bending and twisting acting under load. The effect is related to the slenderness ratio and the cross-sectional shape of the component, and the determination is very complicated. At present, the specifications are given by load test statistics The stability factor method. In order to prevent out-of-plane instability, we usually need to add support to the plane because it is mainly to prevent the components from twisting. This paper mainly discusses the concept of bending moment and the analysis of the problems related to the torsion calculation.