箱式暗钢托座装配式梁柱节点抗震性能试验研究

EXPERIMENTAL STUDY ON SEISMIC PERFORMANCE OF PREFABRICATED BEAM-COLUMN JOINT OF BOX TYPE CONCEALED STEEL BRACKET

针对我国西部地区城镇建设所面临的建设效率低下、质量无法保障,环境保护难以兼顾等难题,提出一种新型箱式暗钢托座装配式梁柱节点。该节点组装简单高效,显著降低了施工现场的工作强度;此外,该节点便于拆装,有利于在构件服役期间进行升级和震后损伤修复与更换。为验证其性能,加工了一组装配式节点模型,开展了拟静力试验,并与一组现浇节点模型进行了对比。试验结果表明,所提出的箱式暗钢托座装配式梁柱节点组装简便,承载能力略大于现浇混凝土梁柱节点的承载力,其破坏模式满足强柱弱梁,节点失效时,装配式梁柱节点的梁体上仅出现少量微细裂缝,而塑性变形主要集中在梁顶的连接件和暗钢托座上,这种设计便于拆卸与更换。

A new type of box type concealed steel bracket assembly beam column node is proposed to address the challenges faced by urban construction in western China,such as low construction efficiency,inability to guarantee quality,and difficulty in balancing environmental protection.The assembly of this node is simple and efficient,significantly reducing the workload on the construction site;In addition,this node is easy to disassemble and assemble,which is beneficial for upgrading and post earthquake damage repair and replacement during the service life of the components.To verify its performance,a modular node model was fabricated,and quasi-static tests were conducted,which were compared with a set of cast-in-place node models.The experimental results show that the proposed box type concealed steel bracket assembly type beam column node is easy to assemble,with a bearing capacity slightly higher than that of cast-in-place concrete beam column nodes.Its failure mode satisfies the strong column weak beam requirement.When the node fails,only a small number of micro cracks appear on the beam body of the prefabricated beam column node,and plastic deformation is mainly concentrated on the connecting parts at the top of the beam and the concealed steel bracket.This design is easy to disassemble and replace.