| 张弦及加载方式对预应力胶合木梁受弯性能的影响 |
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| 引用本文： | 左宏亮,宋鑫,郭楠,王子元.张弦及加载方式对预应力胶合木梁受弯性能的影响[J].东北林业大学学报,2017,45(2). |
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| 作者姓名： | 左宏亮 宋鑫 郭楠 王子元 |
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| 作者单位： | 东北林业大学,哈尔滨,150040 |
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| 基金项目： | 国家林业局林业科学技术研究项目，黑龙江省自然科学基金项目 |
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| 摘 要： | 采用一点张弦一点加载、一点张弦两点加载、两点张弦一点加载、两点张弦两点加载等4种不同的张弦加载方式,对4组12根预应力胶合木梁进行受弯试验,分析4种不同张弦和加载方式对预应力胶合木梁受弯性能的影响。结果表明:在预加力数值一定的前提下,加载点相同时,改变张弦方式对胶合木梁的极限承载力影响不大;张弦点相同时,两点加载比一点加载胶合木梁的极限承载力提高28.8%~38.9%;只有两点张弦两点加载时,梁顶受压区出现褶皱、梁底发生延性受拉破坏,其余破坏形态均为梁底脆性受拉破坏;加载过程中,两点加载较一点加载梁刚度略有提高、可使木材的抗压强度发挥更为充分,提高木材与钢丝的利用率。
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| 关 键 词： | 张弦加载 胶合木梁 弯曲性能 |
Effect of Jacking and Loading Methods on the Bending Performance of Prestressed Glue-lumber Beams |
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| Zuo Hongliang,Song Xin,Guo Nan,Wang Ziyuan.Effect of Jacking and Loading Methods on the Bending Performance of Prestressed Glue-lumber Beams[J].Journal of Northeast Forestry University,2017,45(2). |
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| Authors: | Zuo Hongliang Song Xin Guo Nan Wang Ziyuan |
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| Abstract: | Using one point jacking and one point loading,one point jacking and two points loading,two points jacking and one point loading,two points jacking and two points loading with four different jacking and loading methods in bend test of four groups twelve prestressed glue-lumber beams,we measured the effects of the four different jacking and loading methods on the bending performance of prestressed glue-lumber beams.In the same pre-energizer preconditions with the same loading point,changing the way of jacking has little effect on ultimate bearing capacity of glue-lumber beams.The same jacking point,two loading points than one loading point the glue-lumber beams ultimate bearing capacity increased by about 28.8％-38.9％.Only when two points jacking and two points loading the top of the beam compression zone wrinkles and beam bottom occurs ductility tensile failure,the remaining failure modes are brittle beam bottom tensile failure.In the loading process,the two points loading than one point loading beam stiffness increased slightly,it also can make the timber compressive strength play more fully and improve the utilization rate of wood and steel wire. |
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| Keywords: | Jacking and loading Glue-lumber beams Bending performance |
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