摘要
针对多高层混凝土结构因特殊原因导致梁柱节点等部分混凝土强度不满足设计要求情况,提出梁柱节点分批置换混凝土并用菱形型钢支撑进行置换加固方法,可实现只置换下部结构不合格部位混凝土而上部合格结构不需处理,且下部加固施工时上部结构可正常施工从而不影响工期。依托某在建高层加固处理实例,介绍加固技术施工工艺,包括临时支撑、混凝土置换等,并提出置换混凝土加固方案及施工建议,为同类工程提供参考。采用有限元软件对梁柱节点全截面一次置换和两次置换方案分别进行模拟分析,结果表明,采取两次分批置换方案,结构竖向最大位移和梁最大拉应力均大幅减小,加固方法安全可靠。
For multi-story and high-rise concrete structures,due to special reasons,the concrete strength of beam-column joint and other parts does not meet the design requirements.A method of replacing concrete in batches at beam-column joint and using prismatic steel supports for replacement and reinforcement is proposed.It is possible to replace only the unqualified concrete parts of the lower structure without processing the qualified upper structure,and the upper structure can be constructed normally during the lower reinforcement construction,without affecting the construction period.Based on an example of a high-rise reinforcement project under construction,this paper introduces in detail the construction process of this reinforcement method,including temporary support,concrete replacement,etc.The replacement concrete reinforcement plan and construction suggestions are provided,providing reference for similar projects.The finite element software was used to simulate and analyze the single replacement and two-stage replacement schemes for the full section of the beam-column joint separately.The results show that adopting a two-stage batch replacement scheme significantly reduces the maximum vertical displacement of the structure and the maximum tensile stress of the beam,and the reinforcement method is safe and reliable.
作者
曹青
CAO Qing(China Railway Construction Group Co.Ltd.,Beijing 100040,China)
出处
《铁道建筑技术》
2024年第12期51-54,74,共5页
Railway Construction Technology
基金
中国铁建股份有限公司科技研究开发计划项目(2018-B08)。
关键词
梁柱节点
置换混凝土
结构加固
分批置换
有限元模拟
beam-column joint
concrete replacement
strengthening of structure
batch replacement
finite element simulation
