摘要
为研究型钢混凝土构件在偏心受拉作用下的抗震性能,以剪跨比、轴拉比以及偏心距为主要设计参数,对7根型钢混凝土受拉柱进行了低周反复试验中观察了试件的受力过程和破坏形态,得到滞回曲线以及骨架曲线等。通过理论推导和回归分析,提出了各特征点的计算公式。在此基础上,结合受拉柱的滞回特性,给出卸载刚度计算公式以及相应的滞回规则,并建立了型钢混凝土受拉柱四折线恢复力模型。结果表明:通过试验骨架曲线和计算骨架曲线的对比,二者结果吻合较好,能够较为全面地反映构件的受力性能,建议的四折线恢复力模型较为合理,可用于型钢混凝土受拉柱抗震性能的评估。
To study the seismic performance of steel-reinforced concrete tension columns,low re‑versed cyclic loading tests were carried out on 7 specimens.The shear-span ratio,axial load ratio,and eccentricity were set as design parameters.The failure process and pattern were observed during the tests.The load-displacement curve and the skeleton curves were obtained.The equations to calculate these characteristic points were proposed through theoretical derivation and data regression analyses.On this basis,combined with the hysteretic characteristics of tension columns,the calculation formula of the unloading stiffness and the corresponding hysteretic rules are given,and the four-fold restoring force model of the steel-reinforced concrete tension column is established.The results show that,through the comparison between experimental and calculated results of skeleton curves,the two re‑sults are in good agreement,which can comprehensively reflect the mechanical performance of mem‑bers.The proposed four-fold restoring force model is reasonable and can be used to evaluate the seis‑mic performance of steel-reinforced concrete tension columns.
作者
张鹏
孙仁中
邓宇
李真真
ZHANG Peng;SUN Renzhong;DENG Yu;LI Zhenzhen(Guangxi University of Science and Technology School of Civil Engineering and Architecture,Liuzhou 545006,China)
出处
《防灾减灾工程学报》
CSCD
北大核心
2021年第3期549-557,共9页
Journal of Disaster Prevention and Mitigation Engineering
基金
国家自然科学基金项目(51768008)
中国博士后科学基金项目(2017M613273XB)
广西自然科学基金项目(2015GXNSFAA139263)
柳州市科学研究与技术开发计划(2017BC40202)资助。
关键词
型钢混凝土
骨架曲线
恢复力模型
steel‑reinforced concrete
skeleton curves
restoring force model
