摘要
龙门吊钢塔结构具有高宽比大、横向刚度小、在水平荷载(主要是风荷载)作用下非线性效应显著的特点。文中对一龙门钢塔结构进行了非线性整体稳定的有限元计算,并与采用规范折算长细比公式的计算结果进行了比较,两种方法的计算结果吻合良好。规范折算长细比公式作为一种简便实用的方法,在工程计算中有一定的价值,运用此方法的关键在于合理建立格构式结构的计算模型,通过精确有限元方程确定其计算长度。
Tower structure has the characteristic of weaker transverse stiffness and obvious non-linear behavior. Finite element stability analysis for a steel gantry tower structure was carried out in the paper, and the results were compared with corresponding values from the formula of converted slenderness ratio. The results of two methods all indicate that the design of the structure is correct. As a simple and convenient method, the formula of converted slenderness ratio can be applied to the calculation of the structure. The proper mechanical modal of the latticed structure and the effective length calculated by accurate finite element equation are the key of the above method.
出处
《结构工程师》
2008年第2期56-60,共5页
Structural Engineers
关键词
龙门吊钢塔结构
几何非线性
整体稳定
折算长细比
high-rise steel gantry crane, geometric non-linearity, overall stability, converted slenderness ratio
