摘要
研究新型工业化型钢连接混凝土框架节点(SPC节点)的抗震性能,并比较其与传统现浇钢筋混凝土节点的性能差异。基于梁截面抗弯承载力相等原则之上,提出了SPC节点设计方法,目的在于不降低梁端抗弯承载力的前提上,实现梁端塑性铰转移至H型钢段的削弱截面RBS处。试验采用位移加载制度,分别对SPC节点和对应现浇节点进行低周往复拟静力试验,重点比较两种节点的破坏特征、承载能力、变形能力、耗能能力和关键部位的应变。结果表明:SPC节点的裂缝分布与现浇节点相近,混凝土最大裂缝宽度得到了有效控制;SPC节点的屈服荷载略高于现浇节点,而极限荷载和延性系数得到显著提升,具有较好的承载能力和变形能力;SPC节点的强度和刚度退化相比现浇节点程度更小,力学性能更为稳定;SPC节点比现浇节点滞回曲线更为饱满,具有更好的耗能能力,尤其强震耗能优势明显;SPC节点有效实现了强柱弱梁的破坏机制,表明提出设计方法和构造措施合理有效。由试验结果可知,SPC节点与传统现浇节点相比具有更优的抗震性能,且节点变形和损伤主要集中于型钢截面部分,便于震后快速修复与加固。
The seismic performance of new type industrial profile steel connecting prefabricated concrete(SPC)frame joint was investigated,and the differences between SPC and traditional monolithic reinforced concrete frame joint were compared.Based on the equality of flexural bearing capacity of beam section,a design method of SPC joint was presented to realize translation of plastic hinge from beam end to the reduction beam section(RBS)of H profile steel without decreasing the flexural bearing capacity.The displacement loading strategy was used and the pseudo static tests were conducted to a monolithic joint and the corresponding SPC joint.Failure characteristic,bearing capacity,deformation capacity,energy dissipation capacity,and strains of key positions were compared between these two specimens.The test results showed that the crack distribution of the SPC joint was similar to that of the monolithic joint,but the maximum crack width of concrete was effectively controlled in the SPC joint.The yielding load of the SPC joint was a little higher than that of the monolithic joint;moreover,the ultimate load and ductility of the SPC joint were significantly increased.Therefore,the SPC joint exhibited better bearing and deformation capacities.The degradation of strength and stiffness of the SPC joint under cyclic loads were both obviously smaller than those of the monolithic joint,and it meant the mechanical behavior of the SPC joint was more stable.The hysteretic curves of the SPC joint were fuller than those of the monolithic joint,and it implied the energy dissipation capacity of the SPC joint was better,especially under a high-intensity earthquake.The realization of the strong column and weak beam mechanism meant that the proposed design method and detail of SPC joint were effective and reasonable.Based on the test results,the seismic performance of the SPC joint was better than that of a traditional reinforced concrete joint.The deformation and damage of SPC joint concentrated on profile steel segment,therefore it can be conveniently repaired and reinforced after an earthquake.
作者
沈华
翁大根
张瑞甫
葛庆子
王庆华
SHEN Hua;WENG Dagen;ZHANG Ruifu;GE Qingzi;WANG Qinghua(College of Civil Eng.,Nantong Vocational Univ.,Nantong 226007,China;College of Civil Eng.,Tongji Univ.,Shanghai 200092,China;Sichuan Inst.of Building Research,Chengdu 610081,China)
出处
《工程科学与技术》
EI
CSCD
北大核心
2022年第4期64-75,共12页
Advanced Engineering Sciences
基金
国家自然科学基金项目(51978525)
江苏省建设系统科技项目(2019ZD00126)
江苏省“青蓝工程”中青年学术带头人(2021)
南通市科技计划项目(MS22020025)
南通职业大学重点课题(20ZK01)。
关键词
建筑工业化
梁柱节点
钢–混凝土混合梁
拟静力试验
抗震性能
prefabricated construction
beam-column joint
steel-concrete hybrid beam
quasi-static test
seismic response
