复合加固方形木柱的恢复力模型  

Restoring Force Model of Composite Strengthened Square Timber Columns

作　　者：周长东[1,2] 闫佳玲 阿斯哈 ZHOU Changdong;YAN Jialing;A Siha(School of Civil Engineering,Beijing Jiaotong University,Beijing 100044,China;Beijing’s Key Laboratory of Structure Wind Engineering and Urban Wind Environment(Beijing Jiaotong University),Beijing 100044,China;Beijing Capital Development Holding(Group)Co.,Ltd,Beijing 100101,China)

机构地区：[1]北京交通大学土木建筑工程学院,北京100044 [2]结构风工程与城市风环境北京市重点实验室(北京交通大学),北京100044 [3]北京首都开发控股(集团)有限公司,北京100101

出　　处：《湖南大学学报（自然科学版）》2023年第5期146-155,共10页Journal of Hunan University:Natural Sciences

基　　金：国家自然科学基金资助项目(52078030,51678039)。

摘　　要：内嵌钢筋外包碳纤维(Carbon Fiber Reinforced Polymer,CFRP)布复合加固可以显著提高古建木柱的承载能力和抗震性能.为了研究复合加固木柱的恢复力特性,进行了8根方形木柱的低周往复荷载试验,主要考虑钢筋数量、CFRP布的包裹形式以及不同组合加固模式等因素的影响.基于试验结果提出了复合加固方形木柱的三折线型骨架曲线模型,给出了弹性段、强化段和下降段刚度以及屈服荷载、峰值荷载及其对应的位移等特征参数计算公式,并与试验结果进行对比,验证了参数计算方法的正确性;根据试件滞回曲线的特征,确定了复合加固木柱的滞回规则,建立了复合加固方形木柱的恢复力模型,模型计算与试验结果吻合良好,可以较好地描述复合加固方形木柱的滞回性能.The bearing capacity and seismic performance of historical timber columns can be significantly im⁃proved by the composite strengthening with near-surface mounted steel bars and wrapped carbon fiber reinforced polymer(CFRP)strips.To investigate the restoring force characteristics of composite strengthened timber columns,the cyclic loading tests on eight square timber columns were carried out considering the influence of the number of steel bars,the wrapping form of CFRP strips,and different strengthening modes.Based on the test results,the trilin⁃ear skeleton curve of composite strengthened square timber columns was proposed.And the calculation formulas of characteristic parameters such as stiffness of elastic section,hardening section and descending section,yield load,peak load,and corresponding displacement were provided.Compared with the experimental results,the correctness of the parameter calculation method was verified.According to the characteristics of specimen hysteretic curves,the hysteretic rules of composite strengthened square timber columns were determined,and the restoring force model was established.The calculated results of the model are in good agreement with the experimental results,which can better describe the hysteretic performance of the composite strengthened square timber columns.

关 键 词：恢复力模型 方形木柱 加固 内嵌钢筋 外包碳纤维布 抗震响应 

分 类 号：TU366.2[建筑科学—结构工程]