不同径高比下制孔木梁力学性能试验研究  

Experimental Study on the Mechanical Properties of Drilled Wooden Beams under Different Diameter-to-Height Ratios

作　　者：郭松彪 段绍伟 李文勇 罗群 兰宇晖 Guo Songbiao;Duan Shaowei;Li Wenyong;Luo Qun;Lan Yuhui(School of Civil Engineering,Central South University of Forestry&Technology,Changsha,Hunan 410000,China)

机构地区：[1]中南林业科技大学土木工程学院,湖南长沙410000

出　　处：《黑龙江工业学院学报（综合版）》2024年第8期117-122,共6页Journal of Heilongjiang University of Technology(Comprehensive Edition)

基　　金：国家自然科学基金课题“高强不锈钢筋混凝土界面粘结行为及梁受力性能研究”(课题编号:52178183)。

摘　　要：木结构建筑由于管线布置需要通常会在构件上制孔,尤其在小剪跨比胶合木梁上制孔会显著影响梁的力学特性。针对不同径高比进行试验研究,结果表明:制孔会导致木梁产生额外的横纹拉应力和压应力,迫使孔周约45°方向横向开裂;径高比为0.15、0.30和0.45的试件相较于无制孔梁,极限承载力降幅分别为3.87%、29.03%、41.94%,极限位移降幅分别为6.98%、30.77%、33.48%,表观弹性模量降幅分别为0.53%、6.81%、19.34%。研究进一步揭示了制孔对小剪跨比胶合木梁力学性能的影响规律。Due to the requirements for pipeline layout,wooden structural buildings often have drilled holes in their components,especially in glulam beams with low shear span-to-depth ratio,which significantly affect the mechanical properties of the beams.Experimental research is conducted for different diameter-to-height ratios,and the results indicate that drilled holes cause additional transverse tensile and compressive stresses in wooden beams,forcing lateral cracks to form around the holes at approximately 45°.The specimens with diameter-to-height ratios of 0.15,0.30 and 0.45,when compared to beams without holes,exhibit a decrease in ultimate load capacity by 3.87%,29.03%and 41.94%respectively;the reductions in ultimate displacement are 6.98%,30.77%and 33.48%respectively;and the reductions in apparent modulus of elasticity are 0.53%,6.81%and 19.34%respectively.The research further reveals the influence patterns of drilling on the mechanical performance of glulam beams with low shear span-to-depth ratio.

关 键 词：制孔 横纹拉应力 径高比 力学性能 

分 类 号：TU366.3[建筑科学—结构工程] O34[理学—固体力学]