复合加固木柱抗侧性能的试验研究  

EXPERIMENTAL STUDY ON LATERAL PERFORMANCE OF COMPOSITE STRENGTHENED TIMBER COLUMN

作　　者：阿斯哈 周长东[2] A Si-ha;ZHOU Chang-dong(School of Civil Engineering,Inner Mongolia University of Technology,Hohhot,Inner Mongolia 010051,China;School of Civil Engineering,Beijing Jiaotong University,Beijing 100044,China)

机构地区：[1]内蒙古工业大学土木工程学院,内蒙古呼和浩特010051 [2]北京交通大学土木建筑工程学院,北京100044

出　　处：《工程力学》2023年第12期212-221,共10页Engineering Mechanics

基　　金：国家自然科学基金项目(52078030,51678039)。

摘　　要：为了探究内嵌钢筋外包碳纤维(CFRP)布复合加固圆形木柱的抗震性能,并提出加固木柱的抗侧性能计算方法,以内嵌钢筋数量和CFRP布加固量为变量,开展了5根复合加固木柱的低周往复荷载试验。试验结果表明:复合加固方法能够延缓木柱损伤破坏的进程,加固木柱均表现为试件底部受拉侧木材纤维的断裂,脆性破坏特征显著。复合加固木柱的承载和变形能力提升明显,随着CFRP布加固量的增加,试件的峰值荷载和延性均呈上升趋势,内嵌钢筋的布设位置会影响木柱的抗侧承载力。钢筋和CFRP布的应变-位移滞回曲线与木材的相应曲线分布形态相近,加固材料可以与木材协调变形、共同工作,进而提升木柱的滞回性能。采用条带法对试件截面进行受力分析,通过理论计算与试验数据的对比,验证了截面内力计算方法的可靠性。基于材料力学基本理论,提出了复合加固木柱抗侧性能计算方法,理论计算与试验结果对应良好。In order to investigate the seismic performance of circular timber columns strengthened with near surface mounted steel bars and wrapped CFRP(carbon fiber reinforced polymer)strips,and to propose the calculation method for the lateral performance of strengthened timber columns,5 timber columns with composite reinforcement were tested under lateral cyclic loading,with the number of mounted steel bars and wrapped CFRP strips as variables.The test results indicated that the composite reinforcement method could delay the damage process of timber columns,and the specimens showed tensile rupture of timber grain near the bottom section,indicating significant brittle failure.The bearing capacity and deformation performance of strengthened timber columns were improved obviously.Furthermore,with the increase of wrapped CFRP strips,the peak load and ductility of specimens showed trend of improvement,and the position of the mounted steel bars could influence the bearing capacity of timber columns.The distributions of strain-displacement hysteretic curves of steel bars and CFRP strips were almost consistent with the corresponding curves of timber,which denoted that the strengthening materials could deform and work together with timber,and improve the hysteretic performance of timber columns.The strip method was adopted for the force analysis of the specimen’s cross section,and the reliability of the internal force analysis was verified through the comparison between theoretical calculation and test results.Based on the materials mechanics,the calculation method for the lateral performance of composite strengthened timber column was proposed,and the theoretical results were in good agreement with the experimental data.

关 键 词：圆形木柱 复合加固 抗震性能 往复荷载试验 水平承载力 

分 类 号：TU366.2[建筑科学—结构工程]