摘要
在木工字梁腹板上开孔可同时满足美观和经济需求,但开孔使得腹板内的应力重新分布,工字梁的受力性能和破坏机理发生改变。以开孔直径、位置和数量为参数,对8根1.5 m跨度的木工字梁进行三点弯曲试验,研究不同开孔情况下木工字梁的力学性能。结果表明,开孔直径由90 mm增大至130和170 mm时,木工字梁的峰值荷载分别下降16.17%和29.43%;在开孔直径相同的情况下,开孔位置由750 mm的跨中移动到距离腹板边缘300和500 mm时,木工字梁的峰值荷载分别下降28.82%和6.91%;在五等分点开4个90 mm孔的试件峰值荷载比在距离腹板边缘300 mm处两边各开1个130 mm孔的试件高出28.23%。采用ABAQUS软件进行有限元模拟,模拟破坏现象同试验观测现象一致,拟合得出的试件刚度与试验值误差在5%以内,模拟结果准确。本研究可为木工字梁的市场应用提供理论参考。
Opening holes in web of wood I-Joists can meet both aesthetic and economic needs,but opening holes makes internal stress of web redistribution,and stress performance and destruction mechanism of I-Joists are changed.Taking diameter,position and number of opening holes as parameters,three-point bending tests were carried out on eight wood I-Joists with span of 1.5 m.Mechanical properties of wood I-Joists under different openings were studied.Results showed that peak loads of wood I-Joists decreased by 16.17%and 29.43%respectively with increase of opening hole diameter from 90 mm to 130 and 170 mm.In condition of the same hole diameter,when position of holes moved from 750 mm to 300 and 500 mm from edge of web,peak loads of wood I-Joists decreased by 28.82%and 6.91%respectively.Peak load of specimen with four 90 mm holes opened at five equal points was 28.23%higher than that of specimen with 130 mm hole on each side at distance of 300 mm from edge of web.Finite element simulation was carried out by ABAQUS software,and simulated destruction phenomenon was consistent with experimental observation phenomenon.Errors between simulated and experimental stiffness were less than 5%,and simulation results were accurate.This study could provide theoretical reference for market application of wood I-Joists.
作者
熊亚荻
赵东晖
陈泓君
高颖
孟鑫淼
Xiong Yadi;Zhao Donghui;Chen Hongjun;Gao Ying;Meng Xinmiao(College of Material Science and Technology in Beijing Forestry University,Beijing Key Laboratory of Wood Science and Engineering,MOE Key Laboratory of Wooden Material Science and Application,Beijing 100083,China;Department of Civil Engineering,Beijing Forestry University,Beijing 100083,China)
出处
《广西林业科学》
2021年第6期725-733,共9页
Guangxi Forestry Science
基金
北京市支持中央在京高校共建项目(2015-共建)
国家自然科学基金项目(51908038,31770602)
北京林业大学科技创新计划项目(2019GJZL1)。
关键词
木工字梁
孔径
开孔位置
承载力
有限元分析
wood I-Joist
hole diameter
opening position
load-carrying capacity
finite element analysis
