碳纤维加固框架抗震性能动力试验研究

发布时间：2018-06-03 09:45

本文选题：强柱弱梁 + 碳纤维　；参考：《河北联合大学》2014年硕士论文

【摘要】：根据历来地震给结构造成破坏的经验可知，框架结构的破坏形式多为“强梁弱柱”，因此，建筑结构大面积倒塌。为此研究人员寻求解决办法。例如，提高阻尼：隔震加固、减震加固；提高承载力：设墙加固、设支撑加固、加固墙、加固柱；改善刚度：设墙加固、加固墙；提高延性：加固柱、设缝加固等等。震中“弱柱强梁”的破坏形式给结构造成的破坏最严，为此，希望通过加固碳纤维来转变结构的破坏机制，减轻建筑物的破坏。由于碳纤维的弹性模量大、抗拉强度高、耐火极限好，并且施工方便快捷，从而广泛应用于工程结构加固。通过2个试件的动力试验加载，研究加固前后柱和梁先后的屈服机制，并分析楼板钢筋应力随远近不同的变化，以及加固前后板筋应力的比较。同时分析结构的整体耗能能力、刚度退化、延性系数。在试验研究基础上，进行了框架柱加固简化模型设计及计算分析，分析加固后的临界承载力和刚度矩阵的变化。从试验角度讲，梁铰屈服机制得到实现；耗能面积加大；刚度退化减慢；延性系数减小，但也满足延性系数的要求。从理论计算角度讲，，临界承载力得到提高；刚度矩阵变大，水平承载力得到提高。
[Abstract]:According to the experience of structural damage caused by earthquake, the failure form of frame structure is mostly "strong beam and weak column", therefore, the building structure collapses in a large area. The researchers sought a solution for this. For example, increase damping: isolation reinforcement, seismic reinforcement; increase bearing capacity: wall reinforcement, support strengthening, strengthening wall, reinforcement column; improve stiffness: wall reinforcement, strengthening wall; improve ductility: strengthening column, joint reinforcement, etc. The damage form of "weak column and strong beam" in the epicenter is the most severe. Therefore, it is hoped that the destruction mechanism of the structure can be changed by strengthening carbon fiber, and the damage of buildings can be alleviated. Because carbon fiber has high elastic modulus, high tensile strength, good fire resistance limit and convenient construction, it is widely used in engineering structure strengthening. The yield mechanism of columns and beams before and after reinforcement is studied by dynamic test of two specimens. The stress of floor steel bar varies with the distance and near, and the stress of slab reinforcement before and after reinforcement is compared. At the same time, the overall energy dissipation capacity, stiffness degradation and ductility coefficient of the structure are analyzed. On the basis of experimental study, the simplified model design and calculation analysis of frame column reinforcement are carried out, and the changes of critical bearing capacity and stiffness matrix after reinforcement are analyzed. From the experimental point of view, the yield mechanism of beam hinge is realized; the energy dissipation area is increased; the stiffness degradation is slowed down; the ductility coefficient is reduced, but the ductility coefficient is also satisfied. From the point of view of theoretical calculation, the critical bearing capacity is improved, and the stiffness matrix is increased, and the horizontal bearing capacity is improved.
【学位授予单位】：河北联合大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TU352.11;TU375.4

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