方形不锈钢管海砂混凝土柱在偏心受压荷载作用下的力学性能研究

发布时间：2018-08-25 16:11

【摘要】：由于河砂资源的短缺,使得开发海砂资源用于建筑当中变得非常有意义。在实心不锈钢管混凝土中,一方面由于不锈钢管本身有较好的抗腐蚀性能,另一方面,实心不锈钢管混凝土构件,其核心混凝土处于密闭的环境中,这种特殊的环境也可能限制了海砂对不锈钢管的腐蚀。这使得把海砂不需经过处理,直接应用到不锈钢管混凝土中,从而应用于工程实际的研究变得非常有意义。本文从试验和理论两方面研究了方形不锈钢管海砂混凝土柱在偏心受压作用下的力学性能、工作机理和参数分析。具体进行了以下几个方面的工作:1、综述了国内外关于不锈钢结构、不锈钢管混凝土结构和海砂混凝土结构的试验和理论研究现状,指出了本课题研究的意义以及研究的方法和内容。2、进行了一系列方形不锈钢管海砂混凝土偏压试件的试验研究,包括:14根方形截面不锈钢管混凝土试件、28根方形截面不锈钢管海砂混凝土偏压试件。主要参数为:偏心率、长细比、核心混凝土强度和核心混凝土细骨料类型。实验结果表明:在本文研究条件下,原状海砂可以代替净化海砂及河砂充当不锈钢管混凝土偏压试件核心混凝土的细骨料;试件在偏心受压荷载作用下的极限承载力随着偏心率和长细比的增加而降低。3、利用现有规范对方形不锈钢管海砂混凝土试件承载力进行计算,验证了用现有普通钢管混凝土设计规范计算方形不锈钢管海砂混凝土偏压试件承载力的可行性,计算结果表明:用现有普通钢管混凝土规范计算不锈钢管海砂混凝土偏压试件承载力得出的结果相对安全。4、利用河砂混凝土的本构模型建立了方形不锈钢管海砂混凝土偏压试件的有限元模型,对计算得出的偏压试件的工作机理和不同参数对荷载-跨中挠度关系曲线的影响进行分析,模拟结果与试验结果吻合良好。有限元模拟结果表明:用河砂混凝土的本构模型模拟净化和原状海砂混凝土偏压试件进行有限元分析也能取得较好的计算精度。
[Abstract]:Because of the shortage of river sand resources, it is very meaningful to develop sea sand resources for construction. In the solid stainless steel tube concrete, on the one hand, due to the good corrosion resistance of the stainless steel tube itself, on the other hand, the core concrete of the solid stainless steel tube concrete member is in a closed environment. This particular environment may also limit the corrosion of sea sand to stainless steel tubes. This makes it very meaningful to apply sea sand directly to concrete filled stainless steel tubes without treatment. In this paper, the mechanical properties, working mechanism and parameter analysis of square stainless steel tube sea sand concrete columns under eccentric compression are studied from both experimental and theoretical aspects. In this paper, the following work is carried out in the following aspects: 1. The experimental and theoretical research status of stainless steel structure, stainless steel tube concrete structure and sea sand concrete structure at home and abroad is summarized. The significance of the research, the method and content of the research are pointed out. A series of test specimens of square stainless steel tube sea sand concrete are studied. There are 14 square section concrete filled stainless steel tube specimens and 28 square section stainless steel tube sea sand concrete eccentric compression specimens. The main parameters are eccentricity, aspect ratio, core concrete strength and core concrete fine aggregate type. The experimental results show that the undisturbed sea sand can replace the purified sea sand and the river sand as the fine aggregate of the core concrete of stainless steel tube concrete eccentric compression specimen under the condition of the research in this paper. The ultimate bearing capacity of the specimen under eccentric compressive loading decreases with the increase of eccentricity and slenderness ratio. The bearing capacity of square stainless steel tube sea sand concrete specimen is calculated by using existing codes. The feasibility of calculating the bearing capacity of square stainless steel tube sea sand concrete eccentric compression specimen with the existing design code of ordinary concrete-filled steel tube is verified. The results show that it is relatively safe to calculate the bearing capacity of stainless steel tube sea sand concrete by using the existing code of ordinary steel tube concrete, and the square stainless steel tube sea sand is established by using the constitutive model of river sand concrete. Finite element model of concrete eccentric compression specimen, The working mechanism and the influence of different parameters on the load-span deflection curve are analyzed. The simulation results are in good agreement with the experimental results. The results of finite element simulation show that the simulation of purification with constitutive model of river sand concrete and the finite element analysis of undisturbed sea sand concrete under partial compression can also obtain good calculation accuracy.
【学位授予单位】：福建农林大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TU398.9

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