新型自耗能高墩抗震性能研究  

Research on Seismic Performance of New Self-dissipation Energy High Pier

作　　者：徐秀丽[1] 唐雨生 周叮[1] 李雪红[1] 尹东亚 

机构地区：[1]南京工业大学土木工程学院,江苏南京211816

出　　处：《中国公路学报》2017年第12期81-88,共8页China Journal of Highway and Transport

基　　金：国家重点研发计划项目(2017YFC0703400);国家自然科学基金项目(51778289);国家重点基础研究发展计划("九七三"计划)项目(2013CB036300)

摘　　要：针对震后超高墩薄壁结构损坏难以修复的问题,提出一种由混凝土角柱、装配式钢连梁和混凝土薄壁板组合而成的新型自耗能高墩结构体系。根据新型自耗能高墩体系提出相配套的连接构造方法:混凝土薄壁板采用耗能效率更高的单向约束方式,仅上、下部通过螺栓与钢连梁连接,并通过齿形混凝土后浇带保证板与梁的连接刚度;钢连梁采用工字形截面更利于与混凝土板的连接处理,并与角柱采用焊接刚性连接,以使钢连梁形成更多的塑性铰。以某薄壁高墩桥梁为参照,在截面特性相似的前提下设计1∶15的新型自耗能高墩模型,进行低周反复试验,并用数值模拟方法对2种形式墩柱的抗震性能进行对比分析。试验模型制作过程验证了上述构造设计的便利性和可行性。试验结果表明:新型自耗能高墩除具有震后修复便利的明显优势外,其耗能能力、承载力、延性变形能力均优于传统形式的薄壁墩;在正常使用阶段,新型自耗能高墩具有较大的空间刚度;在遭受设计地震作用时,混凝土薄壁板为主要耗能构件率先进入耗能阶段;在遭受罕遇地震作用时,钢连梁作为二级耗能构件通过屈服耗能来保护承重的角柱,震后仅需对损伤的薄壁板及钢连梁进行替换,即可完成结构的修复。To deal with the difficulty in repairing conventional thin-walled structure of super high pier damaged by earthquake, a new high pier structure system with self-dissipation energy, composed of concrete corner columns, pre-fabricated steel coupling beams and concrete thin- walled plates, was proposed. The connection method was put forward to match with the new self-dissipation energy high pier system. By dint of this method, a one-way restraint with higher energy dissipation efficiency was adopted in the concrete thin-walled plate. Only the upper and the lower parts of the plate were connected with the steel beam by bolts, with a toothed concrete back pouring band ensuring their connection rigidity. The steel coupling beam with an I-shaped cross section was conducive to the connection with the concrete plate. The steel coupling beam was welded to the column with rigid connection in order to generate enough plastic hinges. The new self-dissipation energy high pier model at 1 ： 15 on the premise of similar sectioncharacteristics with the reference of the thin-walled high pier bridge was designed. The seismic performances of the two piers were compared and analyzed by the low cyclic reversed loading test and numerical simulation. The manufacturing process of the test model further verified the convenience and feasibility of the structural design described above. The results show that in addition to the obvious advantages of easy restoration after the earthquake, the energy dissipation capacity, bearing capacity and ductility deformation capacity of the new self-dissipation energy high pier is better than those of the traditional thin-walled pier. Under the service load, new self- dissipation energy high pier has relatively large spatial stiffness. Under the design level earthquake, concrete thin-walled plate works as the primary energy dissipation component, with the priority in entering energy dissipation stage. Under the severe earthquake, steel coupling beams acts as the secondary energy dissipation component, y

关 键 词：桥梁工程 超高墩 低周反复试验 自耗能体系 损伤控制 可恢复结构 

分 类 号：U441.4[建筑科学—桥梁与隧道工程]