预制装配式部分钢骨混凝土框架梁柱中节点抗震性能试验研究

Experimental study of seismic performance for interior beam-column joints of precast and discontinuous steel reinforced concrete frames

预制装配式混凝土结构的节点连接方式是目前解决该技术推广的重点问题.提出了预制装配式部分钢骨混凝土框架结构的概念,即把钢筋混凝土框架结构分解成柱预制构件和梁预制构件两个部分,只在构件连接区和梁柱核心区设置钢骨,钢骨在混凝土构件中不连续,连接区为无筋钢骨混凝土.开展了3个预制装配式部分钢骨混凝土框架中节点试件的低周往复试验,并与两个相同工况的钢筋混凝土框架中节点试件进行了对比.对2种形式5个试件的破坏规律、滞回曲线、承载能力、刚度退化及延性进行了分析,发现预制装配式部分钢骨混凝土试件的承载力是相同配筋的钢筋混凝土试件的3倍,承载力及刚度退化缓慢,延性和耗能能力较好,说明装配式连接节点的设计可靠、抗震性能好,符合强节点、弱构件的抗震设计理念,可用于预制装配式混凝土框架结构的现场装配施工.

The joint connection manner of precast concrete structure is the key to solve the problem of technology promotion at present.A new concept of precast and discontinuous steel reinforced concrete frame structure is put forward.In this new structure,the reinforced concrete frame is divided into two parts,which are precast column members and precast beam members.Steels are only installed in the connect region of members and the core region of beam and column.Steels in the concrete members are discontinuous and unreinforced steels are installed in the connection region.The low cyclic tests are performed for three interior joint specimens of precast and discontinuous steel reinforced concrete frame.The test results are compared with the data of two reinforced concrete frame interior joint specimens in the same working condition.The analyses of the damage law, hysteretic curve,bearing capacity,stiffness degradation and ductility are performed for five specimens of two types.Analytical results indicate that the bearing capacity of the precast and discontinuous steel reinforced concrete specimens is about three times that of the ordinary reinforced concrete specimens.Their degradations of bearing capacity and stiffness are slow and the ductility and energy dissipation are well.The design of prefabrication connection joints is reliable and their seismic performance is well,which is in line with the seismic design principles that joints should be strong and members should be weak.They are suitable for the site assembly construction of the precast and reinforced concrete frame structures.