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Study on Ultimate Strength and Design Method of Stiffened Plates Subjected to Biaxial In-Plane Forces

双轴面内力加筋板极限强度及设计方法研究

基本信息

批准号：
60550329
负责人：
KITADA Toshiyuki
金额：
$ 1.15万
依托单位：
Osaka City University
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (C)
财政年份：
1985
资助国家：
日本
起止时间：
1985 至 1986
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-60550329/
关键词：
Stiffened Plate Stiffened Plate subjected to Biaxial In-Plane Forces Buckling Ultimate Strength Design Method 相関曲線

项目摘要

First of all, interaction curves of the buckling coefficients on longitudinal and transverse buckling stresses of stiffened plates subjected to bi-axial in-plane forces are generated and the minimum required relative flexural rigidity of stiffener to stiffened plate is calculated by the elastic buckling theory.Next, the ultimate strength of bi-axially loaded stiffened plates is investigated through the elasto-plastic and finite displacement analysis on the basis of a finite element method. As a result, the interaction curves on longitudinal and transverse in-plane stresses at the ultimate state of stiffened plate are accurately approximated by a simple curve in terms of longitudinal- and transverse-compressive strengths of stiffened plates subjected to uni-longitudinal and uni-lateral compressions, respectively. Once the longitudinal- and transverse-compressive strengths are obtained, the longitudinal and transverse stresses at the ultimate state of stiffened plates subjected to bi-axial in-plane forces can be predicted by using the interaction curve. The longitudinal-compressive strength can be calculated with a conventional column approach using the effective stiffener consisting of a stiffener and effective part to plate panel between stiffeners. The transverse-compressive strength can be predicted by means of the ultimate strength curves obtained through the elasto-plastic and finite displacement analysis for the plate panels subjected to uni-lateral compression, because it is concluded from the experiment executed in this study and the elasto-plastic and finite displacement analysis that the transverse-compressive strength of stiffened plate is equal to that of the plate panel if the relative flexural rigidity of stiffener is greater than half the minimum required value.

首先，生成了加筋板在双轴面内力作用下纵向和横向屈曲应力下屈曲系数的相互作用曲线，并利用弹性屈曲理论计算了加筋板对加筋板所需的最小相对抗弯刚度。其次，在有限元法的基础上，通过弹塑性和有限位移分析，研究了双轴加载加筋板的极限强度。结果表明，加筋板在极限状态下的纵向和横向应力相互作用曲线可以用一条简单的曲线精确地近似表示加筋板在单纵向和单侧向压缩下的纵向和横向抗压强度。得到纵向和横向抗压强度后，利用相互作用曲线可以预测加筋板在双轴面内力作用下的极限状态下的纵向和横向应力。纵向抗压强度可以用传统的柱法计算，有效加劲肋由加劲肋和加劲肋之间的有效板组成。通过弹塑性分析和有限位移分析得到板的极限强度曲线，可以预测板的横向抗压强度；因为通过本研究的实验以及弹塑性和有限位移分析得出，当加筋相对抗弯刚度大于最小要求值的一半时，加筋板的横向抗压强度与板面板的横向抗压强度相等。