摘要
竹集成材和H型钢通过螺栓连接,形成钢-竹组合梁。竹材位于组合梁的受压区,型钢位于受拉区,充分发挥各自的优势,可以解决钢材受压失稳和竹材受拉脆性破坏的问题。为此,以螺栓间距、竹集成材厚度及宽度为变化参数对组合梁受弯性能展开试验研究。研究结果表明:在弹性阶段,组合梁的刚度和承载力与钢梁的相近,但在弹塑性阶段,竹材抑制了型钢的失稳,组合梁的平均受弯承载力是钢梁的1.9倍,钢-竹组合梁的变形能力强,延性系数可达4.2;组合梁的受弯承载力随着螺栓间距的增大而略有减小,随竹集成材厚度及宽度的增大而呈现不同程度的增大。考虑螺栓连接件的柔性特性,提出了考虑竹材与钢梁界面相对滑移的应变分析模型与计算公式,推导了组合梁的受弯承载力计算式,并与试验结果进行了对比,结果表明计算式精度较高,可以为钢-竹组合梁的应用提供设计依据。
Laminated bamboo lumber(LBL)and H-shaped steel are connected by bolts to form a steel-bamboo composite beam.The bamboo is located at the compression zone of the composite beam,and the section steel is located at the tension zone,which can utilize their respective advantages to solve the problem of steel compression instability and brittle destruction of bamboo in tension.For this reason,static tests were carried out to investigate the bending performance of the composite beam with varying bolt spacing,thickness and width of the laminated bamboo lumber.The experiment results indicate that,in the elastic phase,the stiffness and load capacity of the composite beam are similar to those of the steel beam,but in the elastic-plastic phase,the bamboo material inhibits the instability occurred to the steel section.The average bending load capacity of composite beams is 1.9 times that of steel beams,and the deformation capacity of steel-bamboo composite beam is greater,with ductility coefficient being up to 4.2.The bending capacity of the composite beam decreases slightly with the increasing of bolt spacing,and increases to varying degrees with the increasing of thickness and width of the bamboo lumber.Considering the flexible characteristics of bolted connectors,the strain analysis model and the calculation formulae considering the relative slip at the interface between bamboo and steel beams were proposed,and the bending capacity calculation formulas of the composite beams were deduced.The formula results agree well with the experimental results with high accuracy,which can be used for the application of composite beam.
作者
郭梓梁
陈璇
陈伯望
GUO Ziliang;CHEN Xuan;CHEN Bowang(School of Civil Engineering,Central South University of Forestry and Technology,Changsha 410004,China)
出处
《建筑结构学报》
北大核心
2025年第2期50-58,71,共10页
Journal of Building Structures
基金
湖南省高新技术产业科技创新引领计划(2022GK4052)。
关键词
钢-竹组合梁
螺栓连接
静力试验
刚度计算
受弯承载力
steel-bamboo composite beam
bolted connection
static test
stiffness calculation
bending capacity
作者简介
郭梓梁,出生于1999年,男,工学硕士,主要从事结构设计研究。email:2565164165@qq.com;通信作者:陈伯望,出生于1965年,男,工学博士,教授,主要从事现代竹木结构研究。email:644746697@qq.com。
