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Long-Term Loading Test of Reinforced Glulam Beam

Journal of Renewable Materials 2022年第1期10卷 183-201页

作者： Nan Guo Jing Ren Ling Li Yan Zhao Mingtao Wu College of Civil Engineering Northeast Forestry UniversityHarbin150040China School of Civil Engineering and Architecture Wuyi UniversityWuyishan354300China

Due to creep characteristics of wood,long-term loading can cause a significant stress loss of steel bars in rein-forced glulam beams and high long-term deflection of the beam *** this study,15 glulam beams were subjected to a 90-day long-term loading test,and the effects of long-term loading value,reinforcement ratio and prestress level on the stress of steel bars,midspan long-term deflection,and other parameters were compared and *** main conclusions drawn from this study were that the long-term deflection of the reinforced glulam beams accounted for 22.5%,20.6%,and 18.2%of the total deflection respectively when the loading value was 20%,30%,and 40%of the estimated ultimate load under the long-term *** higher the loading level was,the smaller the proportion of the long-term deflection in the total deflection *** with ordinary glulam beams,the long-term deflection of the reinforced glulam beam was even *** the condition of the constant loading level,the total stress value of the steel bars decreased by 17.5%,13.6%,and 9.1%,and the proportion of the long-term deflection of the beam midspan in the total deflection was 26.9%,24.2%,and 20.6%respectively when the reinforcement ratio was 2.05%,2.68%,and 3.39%.With the increase of the reinfor-cement ratio,the stress loss of the steel bars decreased,and the proportion of the long-term deflection decreased as *** other conditions remained constant and the prestress level of the steel bars was 0 MPa,30 MPa,and 60 MPa,the total stress value of the steel bars decreased by 9.1%,9.4%,and 10.2%,respectively,and the propor-tion of the long-term deflection in the total deflection was 20.6%,26.1%,and 64.9%,*** the increase of the prestress value,the stress loss of the steel bars increased,and the proportion of the long-term deflection increased as well.

关键词： Reinforced glulam beams long-term loading tests creep characteristics prestress total stress of steel bars

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