意杨旋切板胶合木柱的蠕变性能

发布时间：2018-12-14 16:00

【摘要】：本文对意扬旋切板胶合木柱长期荷载作用下的蠕变性能开展了初步研究工作。试件为3组,尺寸均为150 mm×150 mm×2 400 mm,每组试件所施加的轴心受压荷载值都是根据先前相同尺寸柱短期轴压试验确定的。研究过程中用温湿度记录仪记录试验环境变化;用位移传感器记录试件中部的变形大小;运用黏弹性力学理论建立蠕变本构方程;利用Origin软件结合试验数据对本构方程的系数进行拟合。结果表明:足尺旋切板胶合木柱的蠕变变形由弹性变形、黏性变形和黏弹性变形组成;湿度和温度对蠕变变形的影响很大;通过Burger模型、三参量模型和经验模型建立蠕变本构方程,其中Burger模型与三参量模型能够较好地拟合本次试验曲线,而三参量模型所建立的本构方程能够更好地应用于实际工程中。
[Abstract]:In this paper, a preliminary study on creep behavior of lumber columns under long term load is carried out. There are three groups of specimens with the dimensions of 150 mm 脳 150 mm 脳 2 400 mm,. The axial compression loads applied to each group of specimens are determined according to the short-term axial compression tests of the previous columns of the same size. The temperature and humidity recorder is used to record the test environment, the displacement sensor is used to record the deformation in the middle of the specimen, and the viscoelastic theory is used to establish the creep constitutive equation. The coefficient of constitutive equation is fitted by Origin software combined with test data. The results show that the creep deformation of the plywood column is composed of elastic deformation, viscous deformation and viscoelastic deformation, and the influence of humidity and temperature on the creep deformation is great. The creep constitutive equation is established by Burger model, three parameter model and empirical model. The Burger model and three parameter model can fit the test curve well. The constitutive equation established by the three-parameter model can be applied to practical engineering better.
【作者单位】：扬州大学建筑科学与工程学院;扬州市建筑设计研究院有限公司;
【基金】：住建部2015年科学技术项目(2015-K2-009)
【分类号】：TU366.3

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