古建筑城墙抗震性能试验研究
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摘要
为研究古建筑城墙抗震性能,对其修缮保护提供依据,以某处古建筑外包砖城墙为对象,对其等比例缩尺模型进行振动台试验,依次施加三级地震荷载,对模型结构的动力响应进行监测,并对震后破坏形式及模型动力特性进行分析。研究结果表明:震后破坏严重部位为:中部、底部、砖土接触面;在设防烈度地震(8度)、罕遇地震作用下,城墙顶部、底部的相对位移随加载值增大而明显增大;随荷载增加与结构破坏,模型中、上部测点的加速度值放大系数β变小;结构经振动作用后,自振频率降低81. 8%。
In order to study the anti-seismic performance of the ancient city wall,and to provide the basis for the improvement and protection of the ancient building,a shaking table test on the small scale model of the ancient city wall is carried out. It applies three orders of seismic load to the model in turn and detects the dynamic response of the model structure to analyze the damage form after earthquake and the dynamic characteristics of the model. The results show that: the serious damage areas after the earthquake are in the part of middle,bottom and brick-soil contact surface of the model; under the action of fortification intensity( 8 degrees) and rare intensity earthquakes,the relative displacement between the top and bottom of the city wall increases obviously with the increase of loads; with the increase of the loads and the failure of the structure,the magnification factor β of the acceleration value of the middle,upper part of the model decreases; after vibration,the natural frequency of vibration of the structure is reduced by 81.8%.
In order to study the anti-seismic performance of the ancient city wall,and to provide the basis for the improvement and protection of the ancient building,a shaking table test on the small scale model of the ancient city wall is carried out. It applies three orders of seismic load to the model in turn and detects the dynamic response of the model structure to analyze the damage form after earthquake and the dynamic characteristics of the model. The results show that: the serious damage areas after the earthquake are in the part of middle,bottom and brick-soil contact surface of the model; under the action of fortification intensity( 8 degrees) and rare intensity earthquakes,the relative displacement between the top and bottom of the city wall increases obviously with the increase of loads; with the increase of the loads and the failure of the structure,the magnification factor β of the acceleration value of the middle,upper part of the model decreases; after vibration,the natural frequency of vibration of the structure is reduced by 81.8%.
引文
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[5]石玉成,林学文,等.黄土地区生土建筑震害特性及防灾对策研究[J].自然灾害学报,2003,12(3):87-92Shi Yu-cheng,Lin Xue-wen. Study on seismic damage characteristics and disaster prevention countermeasures of raw soil buildings in loess area[J].Journal of Natural Disasters,2003,12(3):87-92(in Chinese)
[6] Nabouch R,Bui Q B,et al. Seismic assessment of rammed earth walls using Pushover tests[A].International Conference on Sustainable Design,Engineering and Construction[C],2016,145:1185-1192
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[8] JGJ/T 101-2015,建筑抗震试验规程[S]JGJ/T 101-2015,Code for seismic test of buildings[S](in Chinese)
[2]刘成清,陈驰,等.生土建筑的抗震性能分析与评估[J].建筑结构,2014,44(19):67-71Liu Cheng-qing, Chen Chi, et al. Analysis and evaluation of seismic performance of raw soil building[J]. Building Structure,2014,44(19):67-61(in Chinese)
[3]王毅红,苏东君,等.生土结构房屋的承重夯土墙体抗震性能试验研究[J].西安建筑科技大学学报(自然科学版),2007,39(4):451-456Wang Yi-hong,Su Dong-jun,et al. Experimental study on seismic behavior of load-bearing rammed earth walls for buildings with raw soil structure[J]. Journal of Xi'an University of Architecture and Technology(Natueal Science Edition),2007,39(4):451-456(in Chinese)
[4]王毅红,樊琨,等.村镇生土结构房屋抗震加固措施试验研究[J].工程抗震与加固改造,2011,33(6):77-81Wang Yi-hong,Fan Kun,et al. Experimental study on seismic strengthening measures for buildings with rural soil structure[J]. Earthquake Resistant Engineering and Retrofitting,2011,33(6):77-81(in Chinese)
[5]石玉成,林学文,等.黄土地区生土建筑震害特性及防灾对策研究[J].自然灾害学报,2003,12(3):87-92Shi Yu-cheng,Lin Xue-wen. Study on seismic damage characteristics and disaster prevention countermeasures of raw soil buildings in loess area[J].Journal of Natural Disasters,2003,12(3):87-92(in Chinese)
[6] Nabouch R,Bui Q B,et al. Seismic assessment of rammed earth walls using Pushover tests[A].International Conference on Sustainable Design,Engineering and Construction[C],2016,145:1185-1192
[7] Maria Idália Gomes,Mário Lopes,Jorge de Brito.Seismic resistance of earth construction in Portugal[J].Engineering Structures,2011,33:932-941
[8] JGJ/T 101-2015,建筑抗震试验规程[S]JGJ/T 101-2015,Code for seismic test of buildings[S](in Chinese)