自密实轻骨料混凝土框架柱抗震性能研究

发布时间：2019-06-17 11:39

【摘要】：随着时代的发展，科学的进步，人们逐渐开始向“绿色、可持续”的发展观念靠拢，在建筑行业中混凝土也开始向低密度、高强度、施工方便、环境污染小的方向发展。近几十年来，陆续出现了许多高性能混凝土，其中一种就是自密实轻骨料混凝土。在自密实混凝土和轻骨料混凝土基础上发展而来的自密实轻骨料混凝土，拥有自重轻、流动性好等综合优点。目前国内外学者对自密实轻骨料混凝土的研究多集中于配合比、工作性能和力学性能上，对于自密实轻骨料混凝土结构或构件的研究十分有限。本文将对自密实轻骨料混凝土框架柱的抗震性能展开研究。本文设计了3个自密实轻骨料混凝土框架柱，并与1个普通混凝土框架柱在低周往复荷载试验下进行对比，综合分析自密实轻骨料混凝土框架柱的抗震性能。通过在不同轴压比情况下的试验数据，分析自密实轻骨料混凝土框架柱的破坏机制、滞回曲线、骨架曲线、延性和耗能能力等，同时与1个相同轴压比的普通混凝土框架柱进行对比。试验研究表明，随着轴压比的增大，自密实轻骨料混凝土框架柱的延性降低，耗散系数减小，，抗震性能变差；与普通混凝土框架柱对比发现，自密实轻骨料混凝土框架柱的延性和耗散系数都低于普通混凝土框架柱。在试验的基础上，利用MARC有限元软件对自密实轻骨料混凝土框架柱进行数值模拟，数值模拟结果显示能够较好模拟框架柱的滞回性能。
[Abstract]:With the development of the times and the progress of science, people gradually begin to move closer to the concept of "green and sustainable". In the construction industry, concrete also begins to develop in the direction of low density, high strength, convenient construction and low environmental pollution. In recent decades, many high performance concrete have appeared one after another, one of which is self-compacting lightweight aggregate concrete. The self-compacting lightweight aggregate concrete developed on the basis of self-compacting concrete and lightweight aggregate concrete has the comprehensive advantages of light weight and good liquidity. At present, most of the research on self-compacting lightweight aggregate concrete at home and abroad focuses on mix ratio, working performance and mechanical properties, but the research on self-compacting lightweight aggregate concrete structure or component is very limited. In this paper, the seismic behavior of self-compacting lightweight aggregate concrete frame columns is studied. In this paper, three self-compacting lightweight aggregate concrete frame columns are designed and compared with one ordinary concrete frame column under low cyclic reciprocating load test, and the seismic performance of self-compacting lightweight aggregate concrete frame columns is comprehensively analyzed. Based on the test data under different axial compression ratios, the failure mechanism, hysteretic curve, skeleton curve, ductility and energy dissipation capacity of self-compacting lightweight aggregate concrete frame columns are analyzed, and compared with a common concrete frame column with the same axial compression ratio. The experimental results show that with the increase of axial compression ratio, the toughness of self-compacting lightweight aggregate concrete frame columns decreases, the dissipation coefficient decreases, and the seismic performance becomes worse. Compared with ordinary concrete frame columns, it is found that the ductility and dissipation coefficients of self-compacting lightweight aggregate concrete frame columns are lower than those of ordinary concrete frame columns. On the basis of experiments, the self-compacting lightweight aggregate concrete frame columns are simulated by MARC finite element software. The numerical simulation results show that the hysteretic performance of frame columns can be well simulated.
【学位授予单位】：湖南科技大学
【学位级别】：硕士
【学位授予年份】：2013
【分类号】：TU37;TU352.11

【相似文献】