离心钢管混凝土抗压性能研究
发布时间：2018-10-04 20:38
【摘要】：离心钢管混凝土(CCFST)作为钢管混凝土一个重要的分支,不但充分利用了钢材和混凝土的材料特性,又弥补了两种材料的缺陷,从而表现出优良的力学性能。因此,CCFST构件的抗压力学性能研究具有重要意义。本文基于ABAQUS6.11有限元分析软件,并结合相关的CCFST轴心受压试验,对CCFST构件的抗压性能进行了相应的研究分析。首先,采用具有代表性的四种实心钢管混凝土材料本构关系,建立与CCFST试验构件尺寸相符的有限元模型。通过对比有限元计算结果与试验结果,分析得出四种实心钢管混凝土材料本构关系在CCFST分析中的适用范围。其次,通过对轴心受压CCFST进行有限元模拟,研究钢管壁厚、混凝土强度及空心率对其轴压性能的影响。再次,通过偏心受压CCFST进行有限元分析,研究钢管壁厚、偏心距及空心率对其偏压性能的影响。最后,结合钢管混凝土统一理论和实心钢管混凝土偏压承载力计算公式,推导出适用于CCFST偏压承载力的计算公式。通过研究得出以下结论:不同的实心钢管混凝土材料本构模型对于CCFST分析适用范围有所区别,Mander模型适用于圆形截面,刘威模型适用于方形截面,钟善桐模型与韩林海模型对于圆形及方形截面均不适用;对于CCFST轴心力学性能的影响,钢管壁厚影响较为明显,混凝土强度影响较弱,空心率过大会明显削弱CCFST的轴心受压承载力,当空心率减小到一定的值时,空心率的进一步减小,其承载力上升并不明显;对于CCFST偏压力学性能的影响,偏心距对承载力影响较为明显,空心率的改变对承载力影响较弱,提高钢管壁厚和减小空心率对离心钢管混凝构件的弹性刚度并无太大影响,但对构件的延性具有一定影响,且提高钢管壁厚对构件延性提高幅度优于降低空心率;本文所提出的CCFST偏压承载力计算公式与数值分析结果具有良好的一致性。
[Abstract]:As an important branch of concrete-filled steel tube (CFST), centrifugal concrete-filled steel tube (CCFST) not only makes full use of the material characteristics of steel and concrete, but also makes up for the defects of the two materials, thus showing excellent mechanical properties. Therefore, it is of great significance to study the compressive mechanical properties of CCFST components. Based on the ABAQUS6.11 finite element analysis software and the related CCFST axial compression test, the compressive performance of CCFST members is studied and analyzed. Firstly, a finite element model which is consistent with the size of CCFST test member is established by using the constitutive relation of four typical solid concrete-filled steel tube materials. By comparing the finite element calculation results with the experimental results, the applicability of the constitutive relations of four kinds of solid concrete-filled steel tube materials in CCFST analysis is obtained. Secondly, the influence of steel tube wall thickness, concrete strength and heart rate on axial compression performance is studied by finite element simulation of axial compression CCFST. Thirdly, the influence of wall thickness, eccentricity and heart rate on the biasing performance of steel tube was studied by CCFST. Finally, based on the unified theory of concrete-filled steel tube (CFST) and the formula for calculating the eccentric bearing capacity of concrete filled steel tubular (CFST), a formula for calculating the bearing capacity of concrete filled steel tube (CCFST) is derived. The conclusions are as follows: different constitutive models of concrete-filled steel tubular materials are applicable to CCFST analysis, and Mander model is suitable for circular section, and Liu Wei model is suitable for square section. Zhong Shantong model and Hanninghai model are not suitable for circular and square sections, and for the influence of CCFST axial mechanical properties, the influence of steel tube wall thickness is obvious, and the influence of concrete strength is weak. The axial compression capacity of CCFST is obviously weakened by the empty heart rate overshoot. When the air heart rate decreases to a certain value, the empty heart rate decreases further and the bearing capacity does not increase obviously, and the effect on the mechanical properties of CCFST bias is not obvious. The influence of eccentricity on the bearing capacity is obvious, but the change of heart rate has a weak effect on the bearing capacity. Increasing the wall thickness of steel tube and reducing the air heart rate have no great effect on the elastic stiffness of the centrifugal steel tube coagulation member, but it has a certain effect on the ductility of the member. The increase of steel pipe wall thickness is better than that of reducing hollow ratio, and the calculation formula of CCFST bias load is in good agreement with the results of numerical analysis.
【学位授予单位】：合肥工业大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TU398.9
本文编号：2251805
[Abstract]:As an important branch of concrete-filled steel tube (CFST), centrifugal concrete-filled steel tube (CCFST) not only makes full use of the material characteristics of steel and concrete, but also makes up for the defects of the two materials, thus showing excellent mechanical properties. Therefore, it is of great significance to study the compressive mechanical properties of CCFST components. Based on the ABAQUS6.11 finite element analysis software and the related CCFST axial compression test, the compressive performance of CCFST members is studied and analyzed. Firstly, a finite element model which is consistent with the size of CCFST test member is established by using the constitutive relation of four typical solid concrete-filled steel tube materials. By comparing the finite element calculation results with the experimental results, the applicability of the constitutive relations of four kinds of solid concrete-filled steel tube materials in CCFST analysis is obtained. Secondly, the influence of steel tube wall thickness, concrete strength and heart rate on axial compression performance is studied by finite element simulation of axial compression CCFST. Thirdly, the influence of wall thickness, eccentricity and heart rate on the biasing performance of steel tube was studied by CCFST. Finally, based on the unified theory of concrete-filled steel tube (CFST) and the formula for calculating the eccentric bearing capacity of concrete filled steel tubular (CFST), a formula for calculating the bearing capacity of concrete filled steel tube (CCFST) is derived. The conclusions are as follows: different constitutive models of concrete-filled steel tubular materials are applicable to CCFST analysis, and Mander model is suitable for circular section, and Liu Wei model is suitable for square section. Zhong Shantong model and Hanninghai model are not suitable for circular and square sections, and for the influence of CCFST axial mechanical properties, the influence of steel tube wall thickness is obvious, and the influence of concrete strength is weak. The axial compression capacity of CCFST is obviously weakened by the empty heart rate overshoot. When the air heart rate decreases to a certain value, the empty heart rate decreases further and the bearing capacity does not increase obviously, and the effect on the mechanical properties of CCFST bias is not obvious. The influence of eccentricity on the bearing capacity is obvious, but the change of heart rate has a weak effect on the bearing capacity. Increasing the wall thickness of steel tube and reducing the air heart rate have no great effect on the elastic stiffness of the centrifugal steel tube coagulation member, but it has a certain effect on the ductility of the member. The increase of steel pipe wall thickness is better than that of reducing hollow ratio, and the calculation formula of CCFST bias load is in good agreement with the results of numerical analysis.
【学位授予单位】：合肥工业大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TU398.9
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