【作者】 郑德胜；

【导师】 胡夏闽；

【作者基本信息】 南京工业大学 ， 结构工程， 2005， 硕士

【摘要】 1994年发生在美国的北岭地震和1995年发生在日本兵库县南部的阪神地震表明,采用全焊或栓焊连接的刚性梁柱节点延性较差,容易发生脆性破坏,而半刚性端板连接组合节点具有较好的延性和较高的强度与刚度,当框架结构采用该类节点时,能增加结构的阻尼,延长结构的自振周期,减小震幅,从而降低震害,是抗震设计中的优选节点形式之一。由于端板连接组合边节点的研究资料相对较少,人们对其受力性能和破坏机理的认识还十分不足,通常将端板连接组合边节点假定为铰接节点,这严重低估了该类节点的受力性能,导致结构设计的过于保守与不经济,为此分析梁一柱组合边节点在循环荷载作用下的破坏机理具有重要的理论意义和工程实际应用价值。 本文对1个半刚性端板连接组合边节点进行了单调静力加载试验并对4个半刚性端板连接组合边节点进行了循环加载试验研究,主要探讨了节点的破坏模式以及混凝土板内纵向钢筋配筋率和柱翼缘内填充混凝土对节点性能的影响,试验结果表明端板连接组合边节点依然具有良好的滞回性能,较好的延性和耗能能力,是一种值得推广的半刚性梁-柱节点形式。 根据现有的试验与理论的研究成果,本文分析了半刚性端板连接组合节点受弯承载能力、初始转动刚度与节点区组合梁的有效宽度。 在实际工程中对半刚性节点的应用还比较少,部分原因在于它与刚接或铰接连接的区分还十分模糊,本文探讨了在常用配筋率条件下钢-混凝土组合节点的分类模型,从而明确了组合节点的性质。 在试验研究和数值分析的基础上,本文提出了半刚性平齐式端板连接组合节点的恢复力模型,对高层组合结构的弹塑性地震时程反应具有一定的参考价值。 节点的抗震性能分析是结构工程中的重点研究课题之一,研究及应用前景十分广阔。本文分析了端板连接组合边节点在循环荷载作用下的破坏机理,为工程设计提供了参考依据,也为进一步采用端板连接组合节点的整体组合框架结构在地震作用下的反应奠定了基础。更多还原

【Abstract】 From the Northridge earthquake in 1994 and the Kobe earthquake in 1995, it is found that the rigid connections of beam-column have poor ductility and result brittle fractures easily. It is well know that the end plate composite joints have better ductility, larger strength resistance and stiffness, which can increase damp, prolong period and decrease swing of structure. So it can reduce the damage and is one of the best choices for resisting earthquake. However, because study on external end-plate composite joints was very limited, cognition on the damage mechanism of this type of joints was rather inadequate. The external joints are often considered as pinned, which underestimate the property of such joints and reduce to much conservation in design, so analysis and response the damage mechanism of external flush end-plate composite joints under seismic load is significant for theory and practice.One flush end-plate external joint under monotonical loading and the other four joints under cyclic loading were tested. Failure modes and the effects of reinforcement ratio and concrete in column flange were synthetically considered during cyclic loading. Results of the experiments show that external flush end-plate composite joint also have quite hysteretic behaviors, better strength resistance and stiffness that are worth to promotion in seismic area.Based on experimental results and plastic analysis simplified formulas on moment resistance of semi-rigid composite joints were introduced. Rotational stiffness and effective width of concrete slab was also discussed. The calculated results were shown to be good agreement with the test results.Part of reasons for lack of practical usage of such joints is that the classification of joints from rigid or pinned connections is not clear, so the classification systems of composite joints in common reinforcements ratio are presented in the paper.According to experimental and mechanical study, the restoring force model of composite joints was presented in this paper. The proposed models can be applied to seismic analyses of flush end-plate composite joint of composite moment frame.The seismic behaviors of connections are great importance for structure field and the foreground of study and application is very wide. Experiments and theoretical analyses presented in this paper may well fit the realistic behaviors of flush end-plate composite joints under seismic load. The conclusion can be useful for design of engineering and make a favorable base for analyzing the seismic behaviors of whole composite structure.This study is funded by research grant of Jiangsu Committee of Science and Technology(Project No BJ95089) and Jiangsu Construction Bureau(Project No JS200001).更多还原