混凝土结构中梁柱节点核心区加固方法研究

Research on the Strengthen Method for Core Region of Beam-Column Joints in Reinforced Concrete Structures

摘要: 建筑结构抗震设计中的“强节点弱杆件”理念虽早已成为业内共识，但多年来国内混凝土结构的检测鉴定、加固设计与施工却极少涉及梁柱节点核心区，由此可能使需加固结构的抗震构造与抗震性能存在缺陷或隐患。基于现行相关规范、规程要求，结合实际工程需求和分析研究、及作为现有混凝土梁柱节点核心区加固措施的补充，提出了适用性较好的高强材料置换节点核心区外周截面加固新方法，详述了其常用置换截面算法的推导过程及相应技术说明和实用建议，并在文后简述了某工程应用该方法加固梁柱节点核心区的成功案例，可供混凝土结构加固改造设计与施工参考。

Abstract: Although the idea of “joints are relatively stronger than members” in seismic design of building structures has been as the industry consensus for a long time, detection, identification, strengthening design and reconstruction of concrete structures rarely involve the core region of beam-column joints in domestic for many years, which may become the construction defect or hidden danger for seismic performance of these structures to be reinforced. Based on several current requirements in relevant codes and specifications about the core region of concrete beam-column joints, according to corresponding research and analysis for engineering needs, the new strengthen method for the concrete core regions by replacing their peripheral part section with the selected high-strength material is firstly proposed as the complementary way with good applicability, then the derivation process about the replacement section algorithm is shown in detail. Furthermore, the relative technical explanations and practical suggestions followed by such a reinforcement engineering case are given at the back of the paper, which can be taken as useful references for some strengthening design and reconstruction of existing concrete structures.