建筑结构学报2017，Vol.38Issue(6)：78-85,8.DOI:10.14006/j.jzjgxb.2017.06.009
粘贴钢板加固木梁持荷1200d受力性能试验研究
Experimental study on mechanical behavior of timber beam strengthened with steel plate during 1 200-day sustained loading
摘要
Abstract
Two full-size timber beams were designed to investigate long-term behavior for 1 200 days,including a reference unstrengthened beam and a timber beam strengthened with steel plate.Experimental results indicate that the primary creep stage and stable creep stage are clearly observed both in the reference beam and the strengthened beam,but the increments of the deflection and curvature at the mid-span section of the strengthened beam are smaller than those of the reference beam,which reflects the restraint effect of steel plate on the long-term performance of timber beam.The strain of the wood was observed to increase with the increase of the temperature and moisture content.Aging theory,Burgurs model and the five-parameter model were fitted to predict the mid-span deflection to time curves of the reference beam.Comparison between the prediction and experimental results shows that the five-parameter model has satisfactory accuracy at both the primary stage and the stable creep stage,and could provide fairly accurate prediction.Finally,a numerical model was developed using the creep equation bulit-in ANSYS to simulate the longterm deflection,while the coefficient in the creep equation was defined as constant at each time step and calculated by linearization technique.The predicted results are in good agreement with the test results.关键词
木梁/钢板加固/长期荷载试验/长期性能/蠕变Key words
timber beam/steel plate strengthening/long-term loading test/long-term behavior/creep分类
建筑与水利引用本文复制引用
张富文,陈溪,许清风,王卓琳,陈玲珠,贡春成..粘贴钢板加固木梁持荷1200d受力性能试验研究[J].建筑结构学报,2017,38(6):78-85,8.基金项目
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). （2015-110）
