【作者】 张洁；

【导师】 汪梦甫；

【作者基本信息】 湖南大学 ， 结构工程， 2013， 硕士

【摘要】 汶川地震震害表明，混凝土框架在地震作用下出现的大多是柱铰破坏机制，没有实现“强柱弱梁”的设计目标。出现这种情况主要原因之一是因为我国当时的抗震规范未考虑框架梁附近的楼板钢筋对梁承载力的影响。本文对框架梁柱节点周围楼板开角缝进行了分析，并将分析结果与普通梁柱节点和碳纤维加固柱端框架节点的分析结果进行了比较，评价楼板开角缝对改进框架结构“强柱弱梁”的效果。在国内外相关理论和方法的基础上，对梁柱节点楼板开角缝做了下面几个方面的研究：(1)简述了国内外框架结构“强柱弱梁”相关的研究现状和最新成果，介绍了各国规范中“强柱弱梁”的定义及抗震设计相关规定；对各种在地震作用下实现“强柱弱梁”的方法进行了比较与评论。(2)对一个6层的2×3钢筋混凝土框架结构进行了动力弹塑性时程分析，探讨了楼板开角缝框架节点、普通框架节点和碳纤维加固柱端框架节点在单、双向地震下结构的屈服机制。结果表明：楼板开角缝框架结构比其余两种结构更容易实现结构的“强柱弱梁”屈服机制。(3)对一工程实例漩口中学A教学楼进行了动力弹塑性分析，探讨了该实例楼板开角缝节点和普通节点在单、双向地震作用下结构的屈服机制。研究结果表明：楼板开角缝节点在地震作用下能很好的实现“强柱弱梁”屈服机制。通过计算结果分析证明，楼板开角缝这一措施部分消除了楼板钢筋对梁刚度的增强效果，能比较好的实现“强柱弱梁”机制。更多还原

【Abstract】 In Wenchuan earthquake, most frames were shown the form of column-hingingfailure mechanism, and it could not achieve the design target of "strong column andweak beam". The main reason of appearing this seismic damage phenomena is that theseismic design code(GB50011-2001) did not consider the fact that slab bar near theframe beam can enhance the bearing capacity of beam. The paper mainly analysesframe beam-column joints with slot-cutting on the slab, compares its result with theordinary beam-column joint and the joint with carbon fiber, and evaluates thatslot-cutting on the slab improve "strong column and weak beam" of RC frame.Based on the related theories and methods at home and abroad, in this paper, theframe joints with slot-cutting on the slab is analyzed from the following aspects.Firstly, the related research status and latest achievements of strong columnand weak beam of the frame structure at home and abroad are briefly described. Thespecific definition and the relevant seismic design codes of "strong column and weakbeam" in different countries are introduced. And then various methods to achieve thetarget of strong column and weak beam are discussed and compared.Secondly, a six-storeys RC frame structure of2×3is analyzed withelastic-plastic dynamic analysis method. The yielding mechanisms of joint with slot,ordinary joint and joint with carbon fiber under both unidirectional and bi-directionalseismic action are discussed. The analysis results demonstrate that the structure ofjoint with slot can better achieve the yielding mechanism of strong column-weakbeam than the other two structures.Finally, an engineering example of the A teaching building of Xuankou middleschool is analyzed with elastic-plastic dynamic analysis method. The yieldingmechanisms of slot-cutting joints and traditional joints of the structure are discussedunder both unidirectional and bi-directional seismic action. The analysis results showthat the slot-cutting joints on the slab can well achieve the yielding mechanism of"strong column and weak beam" under earthquake action.It can be proved that the slot-cutting partly eliminate the enhancement effect of slabreinforcement to the beam rigidity, which can well achieve the yielding mechanism of"strong column and weak beam".更多还原