冻融损伤后钢筋混凝土柱抗震性能研究
发布时间：2019-05-16 19:33
【摘要】：处于寒冷地区的钢筋混凝土结构建筑物常常发生冻融破坏，抗冻性能是钢筋混凝土耐久性能中非常重要的方面。目前，对于冻融后混凝土构件的抗震性能，国内外学者开展的研究工作还很少。 为更好地了解冻融后混凝土结构抗震性能，给抗冻混凝土设计与施工规程、规范的编制提供可靠的科学实验数据，受国家自然科学基金重点项目“腐蚀和冻融环境下既有混凝土结构非线性动力行为和抗震性能评估方法研究”（项目编号：51078307）的资助，本文开展了混凝土柱冻融循环后抗震性能的试验研究： 1.进行了冻融作用后混凝土柱抗震试验研究。首先对四批共8个尺寸为200mm×200mm×1180mm的混凝土柱构件分别进行了0次，，100次，200次，300次冻融循环。然后对混凝土柱进行了两种轴压比下的低周反复荷载试验。 2.通过试验对比低周反复荷载下不同冻融次数后混凝土长柱和普通混凝土长柱的受力性能，对试验所得滞回曲线随着冻融循环作用次数的增加而变化作了较详细的分析，分析了冻融作用对钢筋混凝土柱抗震性能的影响。 3.分析对比轴压比对冻融后混凝土长柱和普通混凝土长柱延性的影响，理论分析和研究不同轴压比对冻融后钢筋混凝土柱抗震性能的影响。 研究表明，冻融次数和轴压比对混凝土构件的抗震性能的影响比较明显。随着冻融次数的增加，混凝土构件的抗震性能成明显下降趋势；冻融次数相同的混凝土柱在两种轴压比下抗震性能有着不同的变化。随着轴压比的增加，混凝土柱耗能能力变弱，延性变差，抗震性能降低。
[Abstract]:Freeze-thaw failure often occurs in reinforced concrete structures in cold areas, and frost resistance is a very important aspect of durability of reinforced concrete. At present, there is little research work on the seismic performance of freeze-thawed concrete members at home and abroad. In order to better understand the seismic performance of freeze-thawed concrete structures and provide reliable scientific experimental data for the design and construction rules and codes of freeze-thawed concrete, Supported by the key project of the National Natural Science Foundation of China, "Research on nonlinear dynamic behavior and Seismic performance Evaluation method of existing concrete structures in corrosion and freeze-thaw Environment" (Project No.: 51078307). In this paper, the experimental study on seismic performance of concrete columns after freeze-thaw cycle is carried out. The seismic test of concrete columns after freeze-thaw action is carried out. Firstly, four batches of 8 concrete column members with the size of 200mm 脳 200mm 脳 1180mm were subjected to 0, 100, 200 and 300 freeze-thaw cycles, respectively. Then the low cycle cyclic load tests of concrete columns under two kinds of axial compression ratio are carried out. 2. By comparing the mechanical properties of concrete long columns and ordinary concrete long columns under different freeze-thaw times under low cyclic loading, the variation of hysteretic curve with the increase of freeze-thaw cycle times is analyzed in detail. The influence of freeze-thaw action on seismic performance of reinforced concrete columns is analyzed. 3. The effects of axial compression ratio on the ductility of long concrete columns and ordinary concrete columns after freeze-thaw are analyzed and compared, and the effects of different axial compression ratios on seismic performance of reinforced concrete columns after freeze-thaw are analyzed and studied theoretically. The results show that the influence of freeze-thaw times and axial compression ratio on the seismic performance of concrete members is obvious. With the increase of freeze-thaw times, the seismic performance of concrete members decreases obviously, and the seismic performance of concrete columns with the same freeze-thaw times varies under two kinds of axial compression ratios. With the increase of axial compression ratio, the energy dissipation capacity of concrete columns becomes weaker, the toughness becomes worse, and the seismic performance decreases.
【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】：2013
【分类号】：TU375.3;TU352.11
本文编号：2478510
[Abstract]:Freeze-thaw failure often occurs in reinforced concrete structures in cold areas, and frost resistance is a very important aspect of durability of reinforced concrete. At present, there is little research work on the seismic performance of freeze-thawed concrete members at home and abroad. In order to better understand the seismic performance of freeze-thawed concrete structures and provide reliable scientific experimental data for the design and construction rules and codes of freeze-thawed concrete, Supported by the key project of the National Natural Science Foundation of China, "Research on nonlinear dynamic behavior and Seismic performance Evaluation method of existing concrete structures in corrosion and freeze-thaw Environment" (Project No.: 51078307). In this paper, the experimental study on seismic performance of concrete columns after freeze-thaw cycle is carried out. The seismic test of concrete columns after freeze-thaw action is carried out. Firstly, four batches of 8 concrete column members with the size of 200mm 脳 200mm 脳 1180mm were subjected to 0, 100, 200 and 300 freeze-thaw cycles, respectively. Then the low cycle cyclic load tests of concrete columns under two kinds of axial compression ratio are carried out. 2. By comparing the mechanical properties of concrete long columns and ordinary concrete long columns under different freeze-thaw times under low cyclic loading, the variation of hysteretic curve with the increase of freeze-thaw cycle times is analyzed in detail. The influence of freeze-thaw action on seismic performance of reinforced concrete columns is analyzed. 3. The effects of axial compression ratio on the ductility of long concrete columns and ordinary concrete columns after freeze-thaw are analyzed and compared, and the effects of different axial compression ratios on seismic performance of reinforced concrete columns after freeze-thaw are analyzed and studied theoretically. The results show that the influence of freeze-thaw times and axial compression ratio on the seismic performance of concrete members is obvious. With the increase of freeze-thaw times, the seismic performance of concrete members decreases obviously, and the seismic performance of concrete columns with the same freeze-thaw times varies under two kinds of axial compression ratios. With the increase of axial compression ratio, the energy dissipation capacity of concrete columns becomes weaker, the toughness becomes worse, and the seismic performance decreases.
【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】：2013
【分类号】：TU375.3;TU352.11
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