船厂门吊超大箱型变截面支腿的稳定性分析

发布时间：2018-01-13 14:00

本文关键词：船厂门吊超大箱型变截面支腿的稳定性分析　出处：《石家庄铁道大学》2015年硕士论文　论文类型：学位论文

【摘要】：随着国民经济的发展,我国造船业发展十分迅猛,对船厂门吊的需求越来越大。造船厂门吊具有跨度大、支腿高、起重量大的特点,通常采用一刚一柔支腿的结构形式,其刚性支腿常采用变截面箱型截面,这种结构形式的立柱计算整体稳定性时,其长度计算系数的选取尚没有明确的规定。同时,支腿采用的薄壁箱型结构,板件宽厚比超大,如何采取适当的构造措施保证其局部稳定性也是一个值得研究的问题。论文以新大方重工科技有限公司为新加坡某造船厂开发研制的CS1500/1000×87双梁造船起重机为研究范例,利用Ansys软件,建立有限元分析模型,对此类超大箱型变截面支腿的稳定性进行了分析研究,论文主要工作如下:(1)对结构稳定理论和分析方法进行了具体介绍,重点介绍了临界荷载的求解方法。(2)利用BEAM189单元建立门吊整体稳定性分析模型,通过改变门吊梁柱的高度、跨度和截面特性,得到不同梁柱线刚度比下的门吊刚性支腿发生特征值屈曲时的临界应力。通过与欧拉公式的比拟,得到支腿的计算长度系数。分别拟合得到等截面和变截面刚性支腿的计算长度估算公式。(3)利用SHELL181单元建立刚性支腿的局部稳定性分析模型,进行几何非线性和材料非线性分析得到非线性屈曲荷载。通过局部稳定非线性屈曲荷载不低于整体稳定屈曲荷载的条件,研究合理有效的局部稳定性构造措施,研究了横隔板对局部稳定性的影响。论文的结果可为船厂门吊支腿及类似超大截面薄壁箱型柱的设计提供一定的参考。
[Abstract]:With the development of the national economy, the development of China's shipbuilding industry is very rapid, the demand of the shipyard gantry crane is more and more big. The shipyard door crane has large span, high leg, feature weight, usually adopts the structure form just a soft leg, the rigid leg often adopts a variable cross-section box section the column, the structure of the overall stability calculation, the calculation length coefficient is not clearly defined. At the same time, thin-walled box structure with outrigger, width thickness ratio is large, how to take appropriate measures to ensure the construction of local stability is a problem worthy of study. Based on the new Dafang heavy industry Singapore Technology Co. Ltd. is a shipbuilding factory developed CS1500/1000 * 87 shipbuilding double beam crane as the research paradigm, using Ansys software, a finite element analysis model for such a large box type variable stability section of legs The analysis and research, the main work is as follows: (1) on the structure stability theory and analysis method are introduced, emphatically introduces the solving method of the critical load. (2) to establish the analysis model of integral stability of gantry crane using BEAM189 unit, by changing the gantry crane beam column height, span and section properties, different beam column the linear stiffness ratio of gantry rigid leg the eigenvalue of critical buckling stress. When compared with the Euler formula by the calculated length coefficient of the leg. The fitting were calculated and variable cross-section rigid leg length formula. (3) the local stability analysis model established by the rigid leg SHELL181 unit, geometric nonlinear and material nonlinear analysis nonlinear buckling loads are obtained. The local stability of nonlinear buckling load of not less than the overall buckling load stable, reasonable and effective research The local stability of structural measures, studied the effect of diaphragm on local stability. The results of this thesis can provide some reference for the design of the shipyard gantry crane legs and similar large cross section thin-walled box column.

【学位授予单位】：石家庄铁道大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U673.38

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