摘要
针对严酷条件下阈值拼装桥墩的受力特性,提出1种具有震后快速恢复功能的钢-UPHC组合节点的装配式桥墩预制构件。钢-UPHC组合节点由I型钢柱、C30混凝土和I型钢构成的组合梁、摩擦阻尼器和UHPC板、加劲板组合的连接件构成。针对设计构件的抗震性能,进行低周期加载试验,重点分析结构的开裂模式、应力状态、耗能比例等抗震性能评价参数。结果显示:UHPC表面裂缝集中在最大应力部位的塑性铰区边缘,混凝土面板并未形成明显的裂缝,节点在循环荷载作用下的滞回曲线较为饱满,未发生局部屈服;节点初始正刚度大于初始负刚度,UHPC板厚100 mm,塑性铰区设计长度120 mm,节点屈服刚度折减比为10.15%,UHPC板厚60 mm,塑性铰区设计长度240 mm下,节点屈服刚度折减仅3.18%,即UHPC板厚越大,塑性铰链区设计长度越短,节点屈服刚度折减系数比越大;屈服后的节点超过60%的总能量由摩擦阻尼器消耗。
In this paper,according to the stress characteristics of threshold-bound piers under severe conditions,a prefabricated pier with steel-UPHC joint and post-earthquake recovery function is proposed.The steel-UPHC composite joints are composed of I-shaped steel columns,C30 concrete,I-shaped steel composite beams,friction dampers,joints of UHPC and stiffening plates.For the seismic performance of designed components,the seismic performance evaluation parameters such as cracking mode,stress state,and energy dissipation ratio are analyzed by low-cycle loading test.According to the results,the cracks on the UHPC surface are concentrated at the edge of the plastic hinge region.The concrete panels do not have obvious cracks,the hysteretic curve of nodes under cyclic load is full,no local yield;The initial positive stiffness of the joint is greater than the initial negative stiffness,UHPC 100 mm,thick design length of plastic hinge 120 mm,the yield stiffness reduction ratio is 10.15%,UHPC plate 60 mm,thick design length of plastic hinge area 240 mm,the yield stiffness reduction of the joint is only 3.18%,i.e.,the thicker the UHPC plate,the shorter the design length of the plastic hinge zone,the greater the yield stiffness reduction coefficient ratio of the joint.More than 60%of the total energy of the yielding node is consumed by the friction damper.
作者
黄西轩
刘业磊
耿志龙
岳希超
HUANG Xixuan;LIU Yelei;GENG Zhilong;YUE Xichao(Henan Urban and Rural Planning and Design Research Institute Co.Ltd.Zhengzhou,Henan 450044,China)
出处
《贵州师范大学学报（自然科学版）》
CAS
2021年第3期92-96,共5页
Journal of Guizhou Normal University：Natural Sciences
