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提出了一种用于混凝土框架结构中屈曲约束支撑连接锚固节点构造形式。通过8个对比试验,分别考察该节点在拉、剪、拉剪复合受力状态下的单调受力性能与滞回性能,分析了各种受力状态下节点的受力特点与破坏模式。试验结果表明,在各种受力状态下,节点屈服前位移均较小,对屈曲约束支撑耗能效率影响并不显著。通过试验结果与规范计算结果的对比发现,现行GB 50010—2010《混凝土结构设计规范》对单一受力状态下锚固节点承载力的计算比较准确,但对拉剪复合受力状态偏于保守;而采用JGJ 145—2004《混凝土后锚固技术规程》中的锚栓破坏相关方程能较为准确地估算拉剪复合受力状态下锚固节点承载力。另外,由于该锚固节点具有下锚固板,锚筋不会被整体拔出破坏,可取消现行规范中锚筋屈服强度取值小于300 MPa的限制。同时,在构造上应限制锚固板的弯曲变形,确保锚固钢筋共同受力,以使节点承载力在较小的位移下得以充分发挥。
A kind of structure for the connection of anchorage nodes with buckling restraint and support in concrete frame structure is proposed. Through eight comparative tests, the monotonic behavior and hysteretic behavior of the joint at different states of tension, shear and tensile shear are investigated respectively. The stress characteristics and failure modes of the joint under various stress conditions are analyzed. The experimental results show that under all kinds of stress conditions, the displacement of the joints before yielding is small, and the impact on the energy dissipation efficiency of buckling restrained brace is not significant. Through the comparison between the test results and the standard calculation results, it is found that the current GB 50010-2010 “Code for Design of Concrete Structures” is more accurate in calculating the bearing capacity of anchorage nodes under a single stress state, Using JGJ 145-2004 “Technical Specification for Post-Concrete Anchorage”, the correlation equations of anchor failure can be used to accurately estimate the bearing capacity of anchorage nodes under tension-shear combined stress conditions. In addition, since the anchorage node has a lower anchorage plate, the anchorage bar can not be pulled out and destroyed completely, and the limit of the yield strength value of the anchorage bar less than 300 MPa can be canceled in the current standard. At the same time, the structure should limit the bending deformation of the anchor plate, to ensure that the anchor bar joint force, so that node bearing capacity can be fully exerted with a small displacement.