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在以往试验研究基础上,分析了钢筋混凝土框架变梁中节点在低周反复荷载作用下的破坏过程和破坏特点,指出按常规节点设计的变梁中节点不能满足刚性节点的要求,《混凝土结构设计规范》(简称《规范》)中该类非规则节点的设计方法存在安全隐患。进一步从节点核心区剪力计算、防斜压破坏控制条件、节点核心区抗剪强度三方面,分析了现行设计方法应用于变梁中节点存在的问题。针对这些问题,提出了比《规范》控制水准较严的变梁节点抗震设计方法及构造措施,并以某综合楼为例,采用建议设计方法对典型变梁中节点进行了核心区抗震验算。结果表明:建议的剪力计算公式可合理反映输入节点区的荷载效应且具有明确物理意义,建议的核心区受剪承载力计算公式可确保节点区安全可靠。
Based on the previous experimental studies, the failure process and failure characteristics of the joints in the RC beam with variable cross-sections were analyzed. It was pointed out that the joints in the RC beam with conventional joints could not meet the requirements of the rigid joints. The concrete structure Design rules “(referred to as” norms ") of such non-regular node design method there is a security risk. Furthermore, the existing design methods are applied to the existence of nodes in the beam from three aspects of shear stress calculation in core zone, control conditions of baroclinic failure and shear strength of core zone. Aiming at these problems, the seismic design method and the construction measures of the beam-to-beam joints with more stringent control standards are put forward. Taking a building as an example, the proposed design method is used to check the seismic resistance of the core in the typical beam. The results show that the proposed shear calculation formula can reasonably reflect the load effect of the input node region and has clear physical meaning. The proposed calculation formula of the shear strength of the core region can ensure the safety and reliability of the node region.