碳纤维加固框架抗震性能拟静力试验研究

发布时间：2018-05-15 17:07

本文选题：框架节点 + 强柱弱梁　；参考：《河北联合大学》2014年硕士论文

【摘要】：现浇钢筋混凝土结构普遍表现为“强梁弱柱”，这些结构由于抗震性能较差，成为不可忽视的安全隐患。对于现浇钢筋混凝土框架结构的梁柱节点，即使满足抗震规范规定的“强柱弱梁”设计要求，，要完全避免柱端出现塑性铰也是很困难的，为了实现梁铰机制，对现有结构节点采取加固措施，提高其抗震性能，使“强梁弱柱”转化为“强柱弱梁”。因此，对这类结构实际的抗震性能及加固方法的研究是十分必要的。首先介绍了普通试件和加固试件的设计和制作，对比分析了两个试件在低周反复荷载作用下的破坏形态，然后根据采集到的柱钢筋和梁钢筋应变，通过比较发现加固前，柱的钢筋应力较大，而梁的应力相对较小，试件表现出强梁弱柱的特点，加固以后，柱钢筋应力较小，同时梁的应力有所增大，达到了预期的强柱弱梁的效果。还对两个不同试件的滞回曲线、骨架曲线、位移延性、刚度退化、耗能能力等性能进行了详细的分析，结果表明：与普通试件相比，碳纤维加固后试件的耗能能力、延性都有所提高，同时加固也使试件的刚度增大，提高了试件的抗震性能。此外还进行了理论研究和计算分析，计算分析了碳纤维加固对两端铰支柱临界力的影响和碳纤维加固后构件刚度矩阵的变化，得知柱端粘贴碳纤维对柱进行加固可提高柱的受压临界力和稳定性，同时加固后柱的刚度也得到了提高。
[Abstract]:The cast-in-place reinforced concrete structures are generally characterized as "strong beams and weak columns", and these structures have become a hidden danger of safety because of their poor seismic performance. For the Liang Zhu joints of cast-in-place reinforced concrete frame structure, it is very difficult to avoid the plastic hinge at the end of the column, even if it meets the design requirements of "strong column and weak beam" stipulated in the seismic code, in order to realize the beam hinge mechanism, In order to improve the seismic performance of existing structural joints, the "strong beam and weak column" can be transformed into "strong column and weak beam". Therefore, it is necessary to study the actual seismic performance and reinforcement method of this kind of structure. In this paper, the design and manufacture of the common and strengthened specimens are introduced, and the failure patterns of the two specimens under low cyclic loading are compared and analyzed. Then, according to the strain of the steel bars and beams collected, it is found that before reinforcement, The reinforcement stress of column is larger than that of beam, and the stress of beam is relatively small. The specimen shows the characteristics of strong beam and weak column. After strengthening, the stress of reinforcing bar is smaller, and the stress of beam increases, which achieves the expected effect of strong column and weak beam. The hysteretic curves, skeleton curves, displacement ductility, stiffness degradation and energy dissipation capacity of two different specimens are analyzed in detail. The ductility of the specimen is improved, and the stiffness of the specimen is increased, which improves the seismic performance of the specimen. In addition, the influence of CFRP reinforcement on the critical force of two ends hinged strut and the change of stiffness matrix of CFRP members are calculated and analyzed. It is known that the compressive critical force and stability of the column can be improved by strengthening the column with carbon fiber at the end of the column, and the stiffness of the column after strengthening is also 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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