复合加固木柱恢复力模型试验研究  

Experimental Study on Restoring Force Model of Composite Strengthened Timber Column

作　　者：阿斯哈 周长东[2] 张婉婷 A Siha;ZHOU Changdong;ZHANG Wanting(School of Civil Engineering,Inner Mongolia University of Technology,Hohhot 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,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：《结构工程师》2023年第6期153-163,共11页Structural Engineers

基　　金：国家自然科学基金资助项目(52078030、51678039);内蒙古自治区高等学校科学技术研究项目(NJZZ23077)。

摘　　要：为了探究内嵌钢筋外包碳纤维(carbon fiber reinforced polymer,CFRP)布复合加固木柱的抗震性能,并建立复合加固木柱的恢复力模型,开展了8根加固木柱的低周往复荷载试验。结果表明:试件均表现为木柱底部受拉侧木材纤维的脆性断裂破坏,复合加固方法可以延缓木柱破坏的进程。滞回曲线、骨架曲线和等效黏滞阻尼系数分布表明:复合加固木柱的抗侧力、变形能力和耗能均得到提升。随着CFRP布加固量的增加,木柱的滞回性能提升,钢筋的布设位置会影响加固木柱的承载力。基于试验数据,通过理论计算和拟合分析,提出了复合加固木柱的骨架曲线模型。理论模型与试验曲线比较一致,理论模型可应用于恢复力模型的建立。给出了复合加固木柱的滞回规则,拟合卸载曲线刚度并结合骨架曲线模型,建立了复合加固木柱的恢复力模型。理论模型与试验曲线吻合良好,表明恢复力模型能够反映加固木柱的滞回性能。To investigate the seismic performance of timber columns strengthened with near surface mounted steel bars and wrapped carbon fiber reinforced polymer(CFRP)strips,and establish the restoring force model of composite strengthened timber columns,the lateral cyclic loading tests on eight reinforced timber columns were carried out.Test results indicated that specimens showed tensile rupture of timber grain near the bottom of column,which was brittle failure.Furthermore,the composite strengthened method could delay the failure process of timber columns.The distributions of hysteretic curves,skeleton curves and equivalent viscous damping ratios denoted that the bearing capacity,deformation performance and energy consumption of reinforced timber columns could be improved.With the number of wrapped CFRP strips increased,the hysteretic performance of timber columns would be enhanced.Moreover,the location of steel bars was able to influence the bearing capacity of reinforced timber columns.Based on test data,through theoretical calculation and fitting analysis,the skeleton curve model of composite strengthened timber columns was proposed.Calculation results were consistent with test curves,which made clear that the model could be used for the establishment of restoring force model.The hysteretic rules of composite strengthened timber column were given,fitting stiffness of unloading curves and considering skeleton curve model,the restoring force model of reinforced timber columns was established.The model curves were in good agreement with test results,which indicated that the proposed model could reflect the hysteretic performance of reinforced timber columns.

关 键 词：木柱 复合加固 抗震性能 往复荷载试验 恢复力模型 

分 类 号：TU366.2[建筑科学—结构工程]