基于有限元分析的外贴BFRP加固新疆杨木梁的抗弯性能研究

发布时间：2019-07-09 13:17

【摘要】：新疆杨在新疆地区分布广泛,生长速度较快,年产量大,但其强度低、耐久性差、易干燥开裂,同时存在木节裂纹等天然缺陷,从而制约了其作为建筑结构受力构件的应用。目前,对力学性能较差的木材可以采用加固的方法改善其力学性能。玄武岩纤维复合增强材料(Basalt fiber reinforced plastics/BFRP)加固就是一种有效的加固技术,该技术在木结构加固修复领域中得到了越来越广泛的应用。部分国内外学者做了采用玄武岩纤维对木制构件的加固研究,但针对新疆杨的加固研究较少,特别是采用有限元模拟的分析相对较少。因此,对BFRP加固新疆杨木梁进行仿真方面的研究具有一定的理论意义。本文针对未加固木梁及粘贴BFRP加固木梁的抗弯性能进行了数值模拟,首先采用有限元软件ANSYS建立了模型,为了验证相关参数及模型的准确性,将模拟值与理论公式计算结果对比分析;其次,通过数值计算分析,得出各试件的荷载-挠度曲线、应力云图、应变沿高度变化曲线等,并对其破坏形式、极限承载力、荷载-变形特性等方面的力学性能进行了综合分析。最后,将数值模拟结果与试验结果相比,BFRP加固新疆杨木梁的变形趋势、抗弯承载力、荷载-挠度曲线等力学特性模拟结果与试验结果较为接近。同时,在相同荷载下,沿横截面高度方向的应变分布也与试验值基本一致,从而数值计算结果是可靠的,为今后的BFRP加固新疆杨木梁的抗弯性能研究提供了一定的参考和借鉴意义。
[Abstract]:Xinjiang poplar is widely distributed in Xinjiang, the growth rate is fast, the annual output is large, but its strength is low, durability is poor, easy to dry and crack, at the same time, there are natural defects such as wood joint crack, which restricts its application as a stress component of building structure. At present, the mechanical properties of wood with poor mechanical properties can be improved by strengthening. Basalt fiber composite reinforcement material (Basalt fiber reinforced plastics/BFRP (basalt fiber composite reinforcement material) is an effective reinforcement technology, which has been more and more widely used in the field of wood structure reinforcement and repair. Some scholars at home and abroad have done research on the reinforcement of wooden components with basalt fiber, but the research on the reinforcement of Xinjiang poplar is less, especially the analysis by finite element simulation is relatively few. Therefore, the research on the simulation of BFRP strengthened poplar beam in Xinjiang has certain theoretical significance. In this paper, the bending performance of unstrengthened wooden beams and bonded BFRP strengthened wooden beams is simulated. Firstly, the finite element software ANSYS is used to establish the model. In order to verify the accuracy of the relevant parameters and models, the simulation values are compared with the theoretical formula calculation results. Secondly, through numerical calculation and analysis, the load-deflection curve, stress cloud diagram and strain variation curve along the height of each specimen are obtained, and the mechanical properties of the failure form, ultimate bearing capacity and load-deformation characteristics are comprehensively analyzed. Finally, the numerical simulation results are compared with the experimental results. The simulation results of mechanical properties such as deformation trend, bending capacity and load-deflection curve of BFRP strengthened poplar beams in Xinjiang are close to the experimental results. At the same time, under the same load, the strain distribution along the cross section height direction is basically consistent with the experimental value, so the numerical calculation results are reliable, which provides a certain reference and reference significance for the future study of the bending performance of Xinjiang Yangmu beam strengthened by BFRP.
【学位授予单位】：新疆大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TU366.2

【相似文献】