预应力增强的芯管连接组合柱抗震性能试验  

Experiment on Seismic Performance of Post-tensioned Strengthened Core-pipe Connected Precast Composite Columns

作　　者：朱张峰[1] 王俊[1] 许凯 ZHU Zhangfeng;WANG Jun;XU Kai(College of Civil Engineering,Nanjing Technology University,Nanjing 211816,China)

机构地区：[1]南京工业大学土木工程学院,江苏南京211816

出　　处：《湖南大学学报（自然科学版）》2023年第11期110-119,共10页Journal of Hunan University:Natural Sciences

基　　金：国家自然科学基金资助项目(51678294);山东省建筑结构鉴定加固与改造重点实验室开放课题(SDKL202002)。

摘　　要：针对预制钢管-混凝土组合柱的连接可靠性问题,提出了预应力增强的芯管连接方案,其采用锚入柱预埋钢管内部的Q420高强芯管连接,并通过结构通高设置的后张无黏结预应力筋进行压接增强.为探讨该新型连接组合结构柱的抗震性能,对1个现浇对比试件和3个采用不同规格芯管连接的装配式试件进行低周反复水平荷载试验,通过对比各试件的破坏形态、滞回曲线与骨架曲线、承载力、刚度、位移延性等,综合评价其抗震性能.基于试验结果,开展了芯管直径及壁厚、芯管长度、连接盖板厚度、预应力筋张拉控制应力等有限元参数分析.试验及参数分析结果表明,装配式试件总体上可实现“等同现浇”的抗震性能,但应考虑刚度提高导致结构地震力效应增大的不利影响;随着芯管截面规格的增大,其承载力、刚度及延性性能逐渐提高,采用D152 mm×16 mm芯管的装配式试件为推荐方案;芯管连接件截面积相当时,建议选用惯性矩更大的截面,黏结长度可按3倍直径设计,连接盖板厚度可按构造确定;对于本次设计试件,预应力筋张拉控制应力建议在0.3~0.6倍预应力筋屈服强度标准值范围内确定.Aiming at the connection reliability problem of precast steel pipe-concrete composite columns,a post-stressed strengthened core-pipe connection is proposed.The columns are connected by Q420 high-strength core pipes,and anchored into the pre-embedded steel pipe of the column.The connection is strengthened by the post-tensioned unbonded tendons through the overall height of the structure.To investigate the seismic performance of the precast composite column,a low-cycled horizontal load test was carried out on a cast-in-place comparison specimen and three precast specimens with different core pipes.The seismic performance of each specimen was comprehensively evaluated by comparing the failure mode,hysteretic curve,skeleton curve,bearing capacity,stiffness,displacement ductility,and energy dissipation.Based on the test results,finite element parameter analysis of core pipe diameter and thickness,core pipe length,connecting cover plate thickness,and prestressed stress was carried out.The test and parameter analysis results show that,precast specimens can generally achieve equivalent cast-in-place seismic performance,but the adverse effects of increased structural seismic force due to increased stiffness should be considered.With the increase of the cross-sectional specification of the core pipe,bearing capacity,stiffness,and ductility of the column gradually increase,and the precast specimen with D152 mm×16 mm core pipe is recommended.Cross-section with a larger moment of inertia and equivalent area is proposed for core pipes.The bonding length of core pipes can be designed as 3 times the diameter.The thickness of the connecting cover plate can be determined by configuration.For the tested specimens,the prestressed stress is recommended to be determined within the range of 0.3fpyk~0.6fpyk.

关 键 词：装配式结构 柱 混合连接 抗震性能 高强钢管 预应力 

分 类 号：TU375.3[建筑科学—结构工程]