摘要
为评价装配整体式地铁车站预制拼装柱的抗震性能,以北京某装配整体式地铁车站为研究背景,设计并制作了3个足尺预制拼装中柱和3个作为对比的足尺现浇整体中柱。采用低周往复循环加载对其进行试验,研究中柱在不同轴压比（0.2,0.5,0.85）下的破坏形态、滞回特性、承载力、变形能力、耗能性能以及适宜轴压比等。试验结果表明：随着轴压比的增大,预制拼装柱和现浇整体柱的水平承载力提高,变形能力和耗能性能逐渐降低。相同轴压比下,预制拼装柱和现浇整体柱的破坏过程相似,但预制拼装柱的塑性铰上移;轴压比为0.2时,预制拼装柱的变形能力低于现浇整体柱的变形能力;轴压比为0.5,0.85时,预制拼装柱的变形能力优于现浇整体柱的变形能力,尤其是轴压比为0.5时预制拼装柱的变形优势最为明显。预制拼装柱的耗能性能随着轴压比的增加而降低,且相对于现浇整体柱的耗能性能显著降低。预制拼装柱的位移延性系数是现浇整体柱的位移延性系数的1.16-1.33倍。随着轴压比的增加,两者的位移延性系数逐渐降低,但预制拼装柱的位移延性系数降低程度明显快于现浇整体柱的位移延性系数降低程度。基于相同轴压比下试件的承载能力和变形能力,建议预制拼装柱的适宜轴压比为0.5。
In order to evaluate the seismic performance of precast column of assembled monolithic subway station, three full-scale precast concrete interior columns and three full-scale cast-in-place concrete interior columns were designed based on the assembled monolithic subway station in Beijing. Main seismic behaviors of interior columns were studied under low-cyclic reversed loading, such as failure modes, hysteretic characteristics, bearing capacity, deformation capacity, energy dissipation capacity and optimum axial compression ratio under different axial compression ratios （0.2,0.5,0.85）. The results show that the horizontal bearing capacity of columns increases while the deformation capacity and energy dissipation capacity decrease with the increase of axial compression ratio. The failure modes are almost similar under the same axial compression ratio, but the position of plastic hinge of precast column moves upwards gradually. Although the deformability of precast columns is worse than that of cast-in-place columns when the axial compression ratio is 0.2, the results are opposite when the axial compression ratios are 0.5 and 0.85. Especially, the advantage of precast column is obvious when the axial compression ratio is 0.5. The energy dissipation capacity of precast column decreases with the increase of axial compression ratio and it dereases significantly compared with cast-in-place concrete column. The ductility of precast column is 1.16-1.33 times of cast- in-place column and they decrease gradually with the increase of axial compression ratio, but decreased degree of displacement ductility of precast columns is obviously larger than that of cast-in-place columns. Based on bearing capacity and deformability with the same axial compression ratio, the appropriate axial compression ratio is suggested to be about 0.5.
作者
杜修力
刘洪涛
许成顺
金浏
罗富荣
李松梅
DU Xiuli;LIU Hongtao;XU Chengshun;JIN Liu;LUO Furong;LI Songmei(Key Laboratory of Urban Security and Disaster Engineering of the Ministry of Education,Beijing University of Technology,Beijing 100124,China;Beijing MTR Construction Administration Corporation,Beijing 100068,China;Beijing Rail and Transit Design ＆ Research Institute Co.,Ltd,Beijing 100089,China)
出处
《建筑结构学报》
EI
CAS
CSCD
北大核心
2018年第11期11-19,共9页
Journal of Building Structures
基金
国家自然科学基金创新研究群体项目(51421005)
北京市交通行业科技项目(2016-gdsbssc-01-029)
关键词
装配整体式地铁车站
拼装柱
轴压比
低周循环加载试验
抗震性能
assembled monolithic subway station
precast column
axial compression ratio
low-cyclic reversed loading experiment
seismic performance
