配有高强箍筋微钢纤维水泥基复合材料柱承载特性研究

发布时间：2018-07-28 08:47

【摘要】：随着经济、人口的快速发展,人们对于建筑的需求越来越多。现代社会,建筑物的数量逐渐增加,其高度也不断提高,所以"轻质高强"是目前建筑追求的目标之一。因此本文提出了采用配有高强复合箍筋的微钢纤维水泥基复合材料方形柱,从结构、材料两个方面来改善方柱的强度、延性、变形性能的新观点。本文一共设计了 18个方形柱试件,有如下几种分组对比方式:按微钢纤维体积分数掺量可以分为0%、1%、2%,各占1/3;按箍筋间距可以分为100mm、70mm、40mm,各占1/3;按水泥基复合材料强度等级可以分为C30、C40,各占1/2。通过对方柱试件的轴心受压试验,分析了微钢纤维的掺量、高强复合箍筋的间距、水泥基复合材料的强度等级对配有高强复合箍筋的微钢纤维水泥基复合材料方柱的承载力以及试件的变形性能的影响。配有高强复合箍筋的微钢纤维水泥基复合材料方形柱的轴心受压试验表明:微钢纤维可以有效地提高水泥基复合材料的变形性能,能很大程度地改善保护层破坏情况;高强复合箍筋减小间距可以高效地提高柱的承载力、变形性能、延性;达到峰值荷载时微钢纤维水泥基复合材料开始破坏,纵筋达到屈服强度,高强复合箍筋达不到屈服强度;采用水泥基复合材料较高的配合比强度等级,柱试件强度较高,但延性、变形性能、箍筋发挥情况比水泥基复合材料配合比强度等级较低的差;采用水泥基复合材料较低的配合比强度等级,更便于观察各个因素的变化对柱试件性能的影响效果。通过分析试验数据、参考经验公式,从理论上推导了配有高强复合箍筋的微钢纤维水泥基复合材料方形柱的承载力公式、微钢纤维水泥基复合材料的强度公式、高强复合箍筋约束微钢纤维水泥基复合材料作用力公式、纵筋应力-应变公式、箍筋应力-应变公式。
[Abstract]:With the rapid development of economy and population, people need more and more buildings. In modern society, the number of buildings is increasing gradually, and the height of buildings is also increasing, so "light weight and high strength" is one of the aims of architecture at present. In this paper, a new viewpoint of improving the strength, ductility and deformation properties of square columns by using square columns with high strength composite stirrups is put forward. A total of 18 square column specimens were designed in this paper. According to the volume fraction of micro-steel fiber, it can be divided into 0 and 1 / 2, each of them accounts for 1 / 3; according to the distance of stirrups, it can be divided into 100 mm and 70 mm / 40 mm, each of which can be divided into 1 / 3; according to the strength grade of cement matrix composite material, it can be divided into C _ (30) C _ (40), accounting for 1 / 2 / 2. Through the axial compression test of square column specimen, the content of micro steel fiber and the spacing of high strength composite stirrups are analyzed. The influence of strength grade of cement matrix composites on the bearing capacity and deformation properties of square columns of micro-steel fiber cement composites with high strength composite stirrups. The axial compression test of square columns of microsteel fiber cement matrix composites with high strength composite stirrups shows that micro steel fibers can effectively improve the deformation properties of cement matrix composites and greatly improve the failure of the protective layer. Reducing the spacing of high strength composite stirrups can effectively improve the bearing capacity, deformation performance and ductility of columns, and when the peak load is reached, the micro-steel fiber cement matrix composites begin to destroy, the longitudinal reinforcement reaches the yield strength, and the high strength composite stirrups do not reach the yield strength. The strength of column specimens is higher than that of cement based composites, but the ductility, deformation properties and stirrups play are lower than those of cement based composites. It is more convenient to observe the effect of various factors on the properties of column specimens by using the lower strength grade of cement matrix composites. By analyzing the test data and referring to the empirical formula, the formula of bearing capacity of square columns with high strength composite stirrups and the formula of strength of micro-steel fiber cement matrix composites are derived theoretically. High strength composite stirrups confined micro-steel fiber cement matrix composite material force formula, longitudinal reinforcement stress-strain formula, stirrups stress-strain formula.
【学位授予单位】：安徽理工大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TB33

【参考文献】