摘要
为发展轻质、耐腐蚀的屈曲约束支撑,以玻璃纤维(GFRP)拉挤型材和缠绕工艺构造支撑约束构件,H型钢为内芯,提出一种新型GFRP-钢屈曲约束支撑.通过理论分析与数值模拟,探究了支撑内芯的屈曲模态发展规律;结合GFRP的各向异性和层合板结构特性,建立了GFRP约束构件的设计参数计算公式;分析了支撑间厚比、翼缘和腹板宽厚比及纤维角度对GFRP约束构件与内芯相互作用特征的影响规律,并给出了合理取值;通过算例分析,验证了该设计方法的可靠性.结果表明:H型钢内芯依次发生翼缘局部屈曲、绕弱轴整体屈曲、腹板局部屈曲和绕强轴整体屈曲,且整体屈曲模态较低,而局部屈曲模态较高;间厚比和宽厚比均会影响内芯的屈曲模态发展,进而改变约束构件的受力状态,间厚比宜为0.125 0~0.50,宽厚比宜小于6.29;GFRP约束构件主应力方向接近45°,为充分发挥纤维纵向承载能力,纤维宜按45°相互垂直交叉布置.
In order to develop lightweight and corrosion-resistant buckling restrained brace,a new type of glass fibre polymer(GFRP)-steel buckling restrained brace(GBRB)was proposed using GFRP pultruded profiles wrapped with the filament-wound layer as the restrained member and the H-shaped steel as the inner core.The development law of buckling modes in the inner core was investigated through theoretical analysis and numerical simulation.The design parameter calculation formula for the restrained member was established considering the anisotropy and the characteristics of the laminates of the GFRP.The influences of gap-thickness ratio,width-thickness ratios of the flange and web,and fibre angle on the interaction characteristics of the restrained member with the inner core were analysed,and reasonable values were given.The reliability of the design method for GBRB was validated using example analysis.The results show that flange local buckling,global buckling around the weak axis,web local buckling,and global buckling around the strong axis occur sequentially in the H-shaped steel core.The overall buckling deformation mode is relatively low,but the local buckling is high-order.The gap-thickness ratio and width-thickness ratio affect the buckling mode development of the inner core,which in turn changes the stress state of the restrained member.The gap-thickness ratio should be 0.1250 to 0.50,and the width-thickness ratio should be less than 6.29.The principal stress direction of the restrained member is essentially near 45°.Consequently,the fibres should be oriented perpendicular to one another at 45°to maximize the fibre s longitudinal bearing capacity.
作者
熊仲明
郑坤
陈帜
谯鸿程
阿鑫
Xiong Zhongming;Zheng Kun;Chen Zhi;Qiao Hongcheng;A Xin(School of Civil Engineering,Xi’an University of Architecture and Technology,Xi’an 710055,China;Qinghai Building and Materials Research Co.,Ltd.,Xining 810008,China;The Key Laboratory of Plateau Building and Eco-community in Qinghai,Xining 810008,China)
出处
《东南大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2024年第1期156-166,共11页
Journal of Southeast University：Natural Science Edition
基金
陕西省自然科学基金重点资助项目(2022JZ-23)
青海省高原绿色建筑与生态社区重点实验室开放基金计划资助项目(KLKF-2020-003)
陕西省住房城乡建设科技科研开发计划资助项目(2020-K31)。
关键词
玻璃纤维
屈曲约束支撑
受力性能
设计方法
glass fibre polymer(GFRP)
buckling-restrained brace
mechanical performance
design method
