高强铝合金角形短柱轴压局部屈曲行为研究  

STUDY ON THE LOCAL BUCKLING BEHAVIOR OF HIGH STRENGTH ALUMINIUM ALLOY ANGLE COLUMNS UNDER AXIAL COMPRESSION

作　　者：胡晓光 程永锋 梅镱潇 杨晓峰 陈梓健 班慧勇[2] HU Xiao-guang;CHENG Yong-feng;MEI Yi-xiao;YANG Xiao-feng;CHEN Zi-jian;BAN Hui-yong(China Electric Power Research Institute,Beijing 100055,China;Department of Civil Engineering,Tsinghua University,Beijing 100084,China)

机构地区：[1]中国电力科学研究院有限公司,北京100055 [2]清华大学土木工程系,北京100084

出　　处：《工程力学》2023年第S01期269-275,共7页Engineering Mechanics

基　　金：国家电网总部科技项目(GCB17201900224)。

摘　　要：为研究高强铝合金角形轴压短柱的局部屈曲行为,对9个由701-T6和703-T6两种高强铝合金材料制作的角形短柱试件开展了轴压试验,试验结果表明:试件的局部屈曲均发生在材料屈服之前,呈一阶特征值屈曲模态。对所有试件进行了有限元建模计算,将有限元模拟结果与试验结果进行了对比验证,并采用验证后的模型进行了参数分析,研究了板件宽厚比对局部稳定性能的影响,板件宽厚比越大,局部屈曲发生越早。将试验与有限元模拟结果与我国现行标准的计算结果进行了对比,发现现行标准中的局部稳定设计公式计算得到的承载力偏低,用于工程设计中尽管能保证安全性,但无法发挥高强铝合金本身的性能优势。因此,在现行标准设计公式的基础上进行了修正,修正后的设计方法能更准确地计算构件承载力,在保证可靠性的前提下更充分地利用材料强度。In order to study the local buckling behavior of high strength aluminium alloy angle columns under axial compression,9 different stub angle columns made of 701-T6 and 703-T6 high strength aluminium alloy were tested.The first-order eigenvalue local buckling mode was observed on every specimen before yielding.The finite element models were established for all specimens and the results were compared to the test results to validate these models.The verified models were then used to carry out parametric study to investigate the influence of width-to-thickness ratio on the local buckling behavior.The results show that the local buckling occurs earlier when the width-to-thickness ratio is larger.The experimental and numerical results were compared with the predictions given by the current Chinese standard.The Chinese standard is found to be safe but conservative as it underestimates the loading capacity,which is not conducive to exploit the full strength of the material.Therefore,a modified design method is proposed based on the current standard,which can give more accurate predictions with the same reliability and efficiency.

关 键 词：高强铝合金 角形柱 轴心受压 局部屈曲 试验研究 有限元模拟 设计方法 

分 类 号：TU395[建筑科学—结构工程]