Long-Term Loading Test of Reinforced Glulam Beam

作     者：Nan Guo Jing Ren Ling Li Yan Zhao Mingtao Wu 

作者机构：College of Civil EngineeringNortheast Forestry UniversityHarbin150040China School of Civil Engineering and ArchitectureWuyi UniversityWuyishan354300China 

出 版 物：《Journal of Renewable Materials》 (可再生材料杂志（英文）)

年 卷 期：2022年第10卷第1期

页      面：183-201页

核心收录：

学科分类：0830[工学-环境科学与工程（可授工学、理学、农学学位）] 082902[工学-木材科学与技术] 08[工学] 0829[工学-林业工程] 0805[工学-材料科学与工程（可授工学、理学学位）] 0706[理学-大气科学] 

基　　金：This research work was supported by the Fundamental Research Funds for the Central Universities(2572017DB02) the natural science foundation of Heilongjiang Province(LH2019E005) the natural science of Heilongjiang Province(LH2020E009) 

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

摘      要：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.