高延性纤维混凝土短柱受剪性能试验研究

发布时间：2019-02-23 19:05

【摘要】：钢筋混凝土短柱是混凝土结构设计中难以避免的一种竖向承重构件，由于短柱在水平荷载作用下以剪切变形为主，表现出明显的脆性破坏，在持续地震作用下无法吸收足够的能量，给结构震后修复带来很大困难。因此，改善钢筋混凝土短柱尤其是高强混凝土短柱的变形能力和脆性剪切破坏模式，对提高结构的抗震性能具有重要理论意义和工程价值。高延性纤维混凝土（DFRC）具有高强度、高耐久性、高延性、拉伸应变硬化、损伤容限高及多缝开裂的特性，，具有很大的能量吸收能力，可以显著改善钢筋混凝土结构的抗震性能，对改善钢筋混凝土短柱尤其是高强混凝土短柱的变形能力和脆性剪切破坏模式，控制结构的地震损伤程度具有重要意义。本文以高延性纤维混凝土短柱为研究对象，设计了5根DFRC短柱试件和1根普通钢筋混凝土短柱对比试件，并通过低周反复加载试验，研究其破坏过程及破坏形态；对6根短柱试件抗剪性能试验结果进行分析，研究各试件的滞回特性、抗剪承载能力、变形能力、耗能能力及刚度退化等；基于修正压力场理论，提出高延性纤维混凝土短柱的受剪承载力理论公式；通过分析各因素对DFRC短柱受剪承载力的影响，得到DFRC短柱的受剪承载力简化计算公式。试验结果与计算分析表明，本文提出DFRC短柱的受剪承载力计算方法安全可靠，且与试验结果吻合较好，可适用于工程设计。
[Abstract]:The reinforced concrete short column is a kind of vertical bearing member which is difficult to avoid in the design of concrete structure. Because the short column is mainly subjected to shear deformation under horizontal load, it shows obvious brittle failure. It can not absorb enough energy under the action of continuous earthquake, which makes it difficult to repair the structure after earthquake. Therefore, improving the deformation capacity and brittle shear failure mode of reinforced concrete short columns, especially high strength concrete short columns, is of great theoretical significance and engineering value in improving the seismic behavior of structures. High ductile fiber reinforced concrete (DFRC) has the characteristics of high strength, high durability, high ductility, tensile strain hardening, high damage tolerance and multi-joint cracking. The seismic behavior of reinforced concrete structures can be improved significantly, and it is of great significance to improve the deformation capacity and brittle shear failure mode of reinforced concrete short columns, especially high strength concrete short columns, and to control the seismic damage degree of structures. In this paper, five DFRC short column specimens and one ordinary reinforced concrete short column contrast specimen are designed, and the failure process and failure pattern are studied by low cycle repeated loading test. The shear performance test results of 6 short column specimens are analyzed, and the hysteretic characteristics, shear bearing capacity, deformation capacity, energy dissipation capacity and stiffness degradation of each specimen are studied. Based on the theory of modified pressure field, the theoretical formula of shear bearing capacity of high ductile fiber reinforced concrete short columns is put forward, and the simplified formula of shear bearing capacity of DFRC short columns is obtained by analyzing the influence of various factors on the shear capacity of DFRC short columns. The experimental results and calculation results show that the calculation method of shear capacity of DFRC short columns is safe and reliable, and it is in good agreement with the test results, which is suitable for engineering design.
【学位授予单位】：西安建筑科技大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TU377.9

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