期刊论文

Experimental research on fatigue behavior of larch glulam beams

Zhang, Zhongfeng(641938556@qq.com)

中文

建筑结构学报

1000-6869

2016

37

10

27-35

10.14006/j.jzjgxb.2016.10.004

国际科技合作与交流专项（2014DFA53120） 国家自然科学基金项目（51578554）

本校为第一且通讯机构

胶合木梁的疲劳极限荷载远低于静力极限荷载而易于破坏,通过落叶松胶合木梁的等幅疲劳试验及静力对比试验,分析了落叶松胶合木梁疲劳破坏形态与破坏机理,并研究了其疲劳特性,探讨了弯曲刚度退化规律。结果表明:落叶松胶合木梁的疲劳损伤从受压侧展开,受压侧塑性区高度随循环次数增加而逐渐向受拉侧扩展,最后因试件承载力降低而发生受拉破坏或顺纹剪切破坏;随着疲劳循环次数的增加,疲劳试验梁跨中挠度及拉、压应变逐渐增大,且压应变增幅大于拉应变,但其截面应变分布仍符合平截面假定;经疲劳荷载作用后,梁的弯曲刚度逐渐降低,基本呈线性退化,应力水平越高,其刚度退化越明显,并得出了不同应力水平下...

Since the fatigue load is much lower than the static limit load,glulam beams are apt to be damaged. Through the constant amplitude bending fatigue test and the static test of larch glulam beams, the fatigue failure pattern and failure mechanism of glulam beams are analyzed. The fatigue properties and stiffness degradation are studied. The results indicate that the fatigue damage of larch glulam beams grows from the compression side, and the depth of plastic zone on the compressive side expands to tension side of the glulam beam with the increase of fatigue load cycles. The failure of glulam be...