粘贴钢板加固木梁持荷1200d受力性能试验研究

发布时间：2018-11-01 11:31

【摘要】：试验中设计了2根足尺木梁,包括1根未加固对比木梁和1根粘贴钢板加固木梁,进行了1200 d的长期持荷试验。试验结果表明:加固木梁与对比木梁均有明显的初始蠕变阶段和稳态蠕变阶段,但加固木梁的跨中挠度和跨中曲率增量明显小于对比木梁,说明加固钢板对木材蠕变具有约束作用;木材应变总体上随温度和湿度的升高而增加、随温度和湿度的降低而减小。采用老化理论、Burgers模型和五参数模型对对比木梁的跨中挠度-持荷时间曲线进行了参数拟合和预测,验证了五参数模型可满足初始与稳态蠕变阶段的计算精度,能够较好地进行木梁蠕变的预测。采用ANSYS中的蠕变方程,并基于所提出的蠕变参数分时段线性化的方法对粘贴钢板加固木梁的长期挠度进行了模拟,计算结果具有较好的精度。
[Abstract]:In the experiment, two full-scale wooden beams were designed, including one unstrengthened contrast beam and one bonded steel plate strengthened wooden beam. The long-term load holding test was carried out for 1200 days. The experimental results show that there are obvious initial creep stage and steady state creep stage in the strengthened wood beam and the contrast wood beam, but the deflection in the span and the increment of curvature in the middle span of the strengthened wood beam are obviously smaller than those of the contrast wood beam. The results show that the strengthened steel plate has restraint effect on the creep of wood. As a whole, the strain of wood increases with the increase of temperature and humidity, and decreases with the decrease of temperature and humidity. By using aging theory, Burgers model and five-parameter model, the curve between deflection and load holding time of beam is fitted and forecasted, which verifies that the five-parameter model can satisfy the calculation accuracy of initial and steady creep stage. It can predict the creep of wood beam well. The creep equation in ANSYS is used and the long-term deflection of wood beams strengthened with steel plates is simulated based on the proposed method of time-divided linearization of creep parameters. The calculated results have good accuracy.
【作者单位】：上海市建筑科学研究院(集团)有限公司上海市工程结构安全重点实验室;
【基金】：上海市科委应用技术开发项目(2015-110) 上海市青年科技启明星计划(15QB1403300) 住房和城乡建设部研究开发项目(2016-K5-017)
【分类号】：TU366.2

【相似文献】