高强铝合金加筋薄壁梁板元相互作用研究  

Study on interaction between plate elements of high-strength aluminum thin-walled stiffened beams

作　　者：牛瑞涛 刘伟[1] 高维成[1] NIU Rui-tao;LIU Wei;GAO Wei-cheng(School of Astronautics, Harbin Institute of Technology, Harbin 150001, China)

机构地区：[1]哈尔滨工业大学航天学院

出　　处：《船舶力学》2019年第8期968-975,共8页Journal of Ship Mechanics

基　　金：航空重大专项（JH20140090）

摘　　要：本文进行了某典型高强铝合金加筋薄壁梁的弯剪承载特性研究。依据工程要求设计了三种缩尺试验模型:横向加筋薄壁梁、附加纵向止裂筋薄壁梁和腹板开口补强薄壁梁。静力加载试验表明:(1)试验件破坏均由受压翼缘的局部屈曲破坏导致,但是不同试验件的屈曲翼缘弯曲变形方向不同;(2)处于腹板受拉区的纵向止裂筋不影响结构承载特性;(3)特别地,试验发现跨中腹板开口补强引起了相邻梁段屈曲翼缘承载力显著提升,目前普遍认为横向加强筋隔开的板元之间无相互作用,因此可以认为这是一种新的板元承载力相互作用。进而,基于被试验验证的有限元模型进行了材料屈曲强度的参数化分析,并证实材料屈服强度越高,板元相互作用引起的屈曲翼缘的承载力变化幅度越大。The bending and the shearing behavior of a certain thin-walled beam made of high-strength aluminum is studied in this paper. Three types of testing models are designed referring to practical engineering. They are transversely stiffened beam, transversely stiffened beam with additional stopping-crack stringer and transversely stiffened beam with reinforced web opening. The testing results show that:(1) The failure of specimen results from local buckling of certain compressive flange which may bend in different directions;(2) Longitudinal stopping-crack stringer does not change structural load-bearing capacity;(3) Notably, reinforced opening in mid-span web significantly improves the flange resistance of the neighboring beam section, which reveals a new resistance interaction between plate element since the traditional knowledge considers that non-connect plate elements separated by transverse stiffener act independently. Then, a parametric analysis on material yield strength is performed through the validated finite element models and verifies that the interaction between plate elements grows with increase of yield strength of material.

关 键 词：高强铝合金 加筋薄壁梁 极限承载力 试验研究 相互作用 数值模拟 屈服强度 

分 类 号：O344[理学—固体力学]