矩形钢管混凝土翼缘工字形梁约束扭转力学性能的试验研究
发布时间：2018-09-18 08:15
【摘要】：随着土木工程结构日益趋向于大跨、高耸、复杂以及施工便捷快速,现有的建筑材料也需要得到相应地发展优化,才能满足现代工程结构的建造要求。传统的工字形钢梁虽然具有强度高,结构重量轻的优点,但常因稳定性不足,不能充分发挥其强度高的优势。因此,出现了钢管空翼缘工字形梁。这种梁通过将传统工字形钢梁的上、下翼缘替换成各种截面的钢管形成,如:将上下翼缘都换成三角形钢管的空翼缘梁、仅将上翼缘换成矩形钢管的空翼缘梁、上下翼缘均换成矩形钢管的空翼缘梁等等。由于该类截面用封闭钢管翼缘替换原来的翼缘板,整个结构的抗扭刚度得到了显著地提高,具有更好的受力性能。本文研究的是一种新型的钢管混凝土翼缘工字形梁。通过在钢管中浇筑混凝土,使钢管空翼缘梁易被局部压曲的缺点得到改善,进一步提高了构件的受力性能。但由于截面形式的复杂性、扭转试验对边界条件及加载条件所需的特殊要求等原因,相关的约束扭转试验尚未见报道。因此,本课题采用试验的研究方法并结合有限元分析,对单跨矩形钢管混凝土翼缘工字形梁的约束扭转力学性能进行了分析研究。本文主要研究内容有:(1)开展了三根矩形钢管混凝土翼缘工字形梁约束扭转力学性能试验。此外,设计了1套用于约束扭转试验的夹支座及约束扭转加载装置,并通过工字形钢梁的约束扭转试验初步验证了此套试验装置的可靠性。(2)详细记录了三根试验梁在试验过程中的试验现象和试验数据,绘制了荷载—应变曲线及转角—扭矩的关系曲线。对试验结果进行了分析,揭示矩形钢管混凝土翼缘工字形梁发生约束扭转变形时的力学特性。(3)应用ANSYS有限元软件,建立了矩形钢管混凝土翼缘工字形梁有限元模型,并对有限元模型的正确性进行了验证。对试验梁有限元模型进行约束扭转分析,将分析结果与试验结果进行了对比分析。基于ANSYS有限元模型,分析研究了钢管翼缘高宽比、混凝土强度、材料等级等因素对矩形钢管混凝土翼缘工字形梁约束扭转力学性能的影响。
[Abstract]:With the increasing tendency of civil engineering structures to long span, towering, complex and convenient construction, the existing building materials also need to be developed and optimized accordingly, in order to meet the construction requirements of modern engineering structures. Although the traditional I-shaped steel beam has the advantages of high strength and light weight, it is often not able to give full play to its high strength due to its lack of stability. Therefore, an I-shaped beam with empty steel tube flange appears. This type of beam is formed by replacing the upper and lower flange of the traditional I-shaped steel beam with steel tubes of various sections, such as replacing the upper and lower flange with the hollow flange beam of the triangular steel pipe, and replacing the upper flange with the hollow flange beam of the rectangular steel pipe. Upper and lower flange are replaced by rectangular steel tube blank flange beam and so on. The torsional stiffness of the whole structure has been significantly improved because the flange plate was replaced by the flange of the closed steel tube in this kind of section and the mechanical performance of the whole structure was better. In this paper, a new type of steel tube concrete flange I-shaped beam is studied. By pouring concrete into the steel tube, the defect that the steel tube blank flange beam is easily subjected to local compression is improved, and the mechanical properties of the members are further improved. However, due to the complexity of section form and the special requirements of torsion test for boundary conditions and loading conditions, the relevant constrained torsion tests have not been reported. Therefore, in this paper, the restrained torsional mechanical properties of single-span rectangular steel tube concrete filled steel tube flange I-shaped beams are studied by means of experimental research and finite element analysis. The main contents of this paper are as follows: (1) three concrete filled rectangular steel tube flange I-shaped beams have been tested on the restrained torsional mechanical properties. In addition, a set of clamping supports and a constrained torsion loading device are designed for restrained torsion test. The reliability of the test device is preliminarily verified by the restrained torsion test of I-shaped steel beams. (2) the experimental phenomena and test data of three test beams during the test are recorded in detail. The load-strain curve and the curve between angle and torque are plotted. The experimental results are analyzed to reveal the mechanical characteristics of rectangular concrete-filled steel tube flange I-shaped beam under constrained torsional deformation. (3) the finite element model of rectangular steel tubular concrete flange I-shaped beam is established by using ANSYS finite element software. The correctness of the finite element model is verified. The finite element model of the test beam is analyzed by the constraint torsion analysis, and the results are compared with the test results. Based on the ANSYS finite element model, the effects of the ratio of height to width of steel tube flange, concrete strength and material grade on the restrained torsional mechanical properties of rectangular steel tube concrete flange I-shaped beam are studied.
【学位授予单位】：东北石油大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TU398.9
，
本文编号：2247309
[Abstract]:With the increasing tendency of civil engineering structures to long span, towering, complex and convenient construction, the existing building materials also need to be developed and optimized accordingly, in order to meet the construction requirements of modern engineering structures. Although the traditional I-shaped steel beam has the advantages of high strength and light weight, it is often not able to give full play to its high strength due to its lack of stability. Therefore, an I-shaped beam with empty steel tube flange appears. This type of beam is formed by replacing the upper and lower flange of the traditional I-shaped steel beam with steel tubes of various sections, such as replacing the upper and lower flange with the hollow flange beam of the triangular steel pipe, and replacing the upper flange with the hollow flange beam of the rectangular steel pipe. Upper and lower flange are replaced by rectangular steel tube blank flange beam and so on. The torsional stiffness of the whole structure has been significantly improved because the flange plate was replaced by the flange of the closed steel tube in this kind of section and the mechanical performance of the whole structure was better. In this paper, a new type of steel tube concrete flange I-shaped beam is studied. By pouring concrete into the steel tube, the defect that the steel tube blank flange beam is easily subjected to local compression is improved, and the mechanical properties of the members are further improved. However, due to the complexity of section form and the special requirements of torsion test for boundary conditions and loading conditions, the relevant constrained torsion tests have not been reported. Therefore, in this paper, the restrained torsional mechanical properties of single-span rectangular steel tube concrete filled steel tube flange I-shaped beams are studied by means of experimental research and finite element analysis. The main contents of this paper are as follows: (1) three concrete filled rectangular steel tube flange I-shaped beams have been tested on the restrained torsional mechanical properties. In addition, a set of clamping supports and a constrained torsion loading device are designed for restrained torsion test. The reliability of the test device is preliminarily verified by the restrained torsion test of I-shaped steel beams. (2) the experimental phenomena and test data of three test beams during the test are recorded in detail. The load-strain curve and the curve between angle and torque are plotted. The experimental results are analyzed to reveal the mechanical characteristics of rectangular concrete-filled steel tube flange I-shaped beam under constrained torsional deformation. (3) the finite element model of rectangular steel tubular concrete flange I-shaped beam is established by using ANSYS finite element software. The correctness of the finite element model is verified. The finite element model of the test beam is analyzed by the constraint torsion analysis, and the results are compared with the test results. Based on the ANSYS finite element model, the effects of the ratio of height to width of steel tube flange, concrete strength and material grade on the restrained torsional mechanical properties of rectangular steel tube concrete flange I-shaped beam are studied.
【学位授予单位】：东北石油大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TU398.9
，
本文编号：2247309
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