基于统一强度理论的钢管混凝土斜交网格平面相贯节点承载力分析  

ANALYSIS ON BEARING CAPACITY OF PLANAR INTERSECTING CFST CONNECTION IN DIAGRID STRUCTURE BASED ON THE TWIN SHEAR UNIFIED STRENGTH THEORY

作　　者：史庆轩[1] 戎翀 张婷[1] 任浩[1] 赵冬[1] 

机构地区：[1]西安建筑科技大学土木工程学院,陕西西安710055

出　　处：《工程力学》2016年第8期77-83,共7页Engineering Mechanics

基　　金：国家自然科学基金项目(51478382;51178380);教育部长江学者和创新团队发展计划项目(IRT13089)

摘　　要：斜交网格筒结构是一种新型的(超)高层建筑结构体系,由斜柱斜交而成的节点是确保此类结构安全可靠的关键部位。基于国内外的试验研究和理论分析,分析了钢管混凝土斜交网格筒平面相贯节点的构造形式、受力性能和破坏形式。考虑相贯节点核心混凝土受到的约束作用,从双剪统一强度理论出发,对圆钢管混凝土斜交网格筒相贯节点区域内与节点区域外部的核心混凝土进行受力分析,建立了圆钢管混凝土斜交网格筒平面相贯节点承载力的计算公式。所得计算结果与试验结果吻合良好,说明所提出公式的合理性。该文还分析了影响此类相贯节点承载力的影响因素,对钢管混凝土斜交网格筒相贯节点的破坏形式及控制因素进行探讨。采用Von Mises屈服准则对椭圆连接板进行受力分析,提出了临界角度的计算公式。该文研究成果对工程实际具有一定的参考价值。A diagrid structural system is an innovative super high-rise building structural system, the key part to ensure safety and reliability is the joint that is oblique crossed by a batter post. Based on the tests and theoretical analysis at home and abroad, the structural form, mechanical performance and failure mode of planar intersecting concrete filled steel tube （CFST） connections in a diagrid structure are analyzed. Considering the restriction effect on core-concrete, the mechanical performance of core-concrete, which is in a planar intersecting joint area or not of round steel tube concrete skew grid, is analyzed based on the Twin Shear Unified Strength Theory. The compressive strength formula of planar intersecting CFST connections in a diagrid structure is proposed. Formula results are in a good agreement with test results. The result shows that the formula deduced in the paper has good applicability. Furthermore, the influence factors of bearing capacity of the joint are analyzed, and the failure mode and controlling factor of planar intersecting concrete filled steel tube connections in a diagrid structure are discussed. The mechanical performance of an elliptical connection plate is analyzed based on Von Mises yield criterion, and a critical angle formula is proposed. Research findings have an important practical value.

关 键 词：斜交网格结构 钢管混凝土 统一强度理论 极限承载力 临界角度 计算公式 

分 类 号：TU398[建筑科学—结构工程]