圆不锈钢管海砂混凝土构件在偏拉作用下的力学性能研究

发布时间：2018-12-15 06:57

【摘要】：不锈钢管海砂混凝土结构优点突出,不仅解决了河砂资源短缺、普通钢管混凝土耐久性差的问题,而且继承了普通钢管混凝土承载力高、抗震性能优越等结构优点。目前,国内外关于不锈钢管混凝土构件的偏拉力学性能研究还未曾报道过,也没有可参考的相关规范。但不锈钢管海砂混凝土发展与应用具有广阔的前景,因此研究不锈钢管海砂混凝土具有重要的工程意义。本文将理论和试验两部分相结合,深入细致的研究了圆不锈钢管海砂混凝土构件轴拉,偏拉作用下的力学性能,工作机理和参数分析。以下几个方面是本次试验开展的工作具体,包括:1、对国内外关于不锈钢和海砂混凝土以及(不锈)钢管混凝土的力学性能的试验和理论研究进行了综述。2、进行了 4根空钢管构件和30根不锈钢管海砂混凝土构件的受拉试验研究,试验主要考察荷载偏心距、截面含钢率、混凝土类型对构件受拉作用下的影响规律,主要包括各参数对圆不锈钢管混凝土构件的抗拉极限承载力,荷载(N)-位移(△)关系曲线,弯矩(M)-应变(θ)关系曲线,荷载(N)-应变(ε)关系曲线。在此基础上,将试验得到的结果与国家规范(GB50936-2014)、福建省地方规范(DBJ/T13-51-2010)、欧洲规范(EC4-2005)、美国规范(AISC-2010)进行了对比,探讨了现有规范计算不锈钢管混凝土受拉构件的承载力的可行性。3、在确定(不锈)钢材和核心混凝土的本构关系的基础上,利用有限元软件建立了圆(不锈)钢管混凝土构件在偏拉作用下的有限元分析模型。并利用试验获得的受拉构件的破坏形态、荷载-应变关系曲线和承载力验证该模型有效性。4、利用经过试验结果验证准确的有限元模型,对试验典型构件的破坏模态,荷载(N)-应变(ε)关系曲线以及混凝土中截面应力云图进行了机理分析,并选取了几个典型参数进行了参数分析。
[Abstract]:The advantages of stainless steel tube sea sand concrete structure not only solve the problems of shortage of river sand resources and poor durability of ordinary concrete filled steel tube, but also inherit the advantages of high bearing capacity of ordinary concrete filled steel tube and superior seismic performance. At present, the research on the mechanical properties of concrete filled stainless steel tube members has not been reported, and there are no relevant specifications for reference. However, the development and application of stainless steel tube sea sand concrete has a broad prospect, so the study of stainless steel tube sea sand concrete has important engineering significance. In this paper, the mechanical properties, working mechanism and parameter analysis of round stainless steel tube sea sand concrete members under axial tension and partial tension are studied by combining theory and experiment. The following aspects are the specific work of this test, including: 1. The mechanical properties of stainless steel, sea sand concrete and (stainless steel) concrete filled with steel tube are summarized. The tensile tests of 4 hollow steel tube members and 30 stainless steel tube sea sand concrete members are carried out. The effects of load eccentricity, section steel content and concrete type on the tensile behavior of the members are investigated. It mainly includes the tensile ultimate bearing capacity of concrete filled circular stainless steel tube members with various parameters, the load (N) displacement curve, the moment (M) strain relation curve and the load (N) strain curve. On this basis, the test results are compared with national norms (GB50936-2014), Fujian local norms (DBJ/T13-51-2010), European norms (EC4-2005) and American norms (AISC-2010). The feasibility of calculating the bearing capacity of concrete filled stainless steel tube (CFST) members with existing codes is discussed. 3. On the basis of determining the constitutive relationship between steel (stainless steel) and core concrete, The finite element analysis model of circular (stainless steel tube) concrete-filled steel tube members under partial tension is established by using finite element software. The failure patterns of tensile members, load-strain relationship curves and bearing capacity are used to verify the validity of the model. 4. The accurate finite element model is verified by the test results, and the failure modes of typical members are tested. The mechanism of the load (N) strain (蔚) curve and the stress cloud diagram of the middle section of concrete are analyzed, and several typical parameters are selected to analyze the parameters.
【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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