钢管高强混凝土构件基本承载力分析与设计
发布时间：2018-08-24 07:39
【摘要】：高强混凝土具有孔隙率低、密度大和抗压强度高等优点。然而随着高强混凝土的强度增加，其脆性迅速增加，如何在克服其脆性的情况下，最大限度的利用高强混凝土的优点，一直是比较热门的研究课题，本文应用的钢管高强混凝土结构形式，避免了高强混凝土的脆性，充分发挥了高强混凝土的优点。预应力钢管高强混凝土管，是空心钢管高强混凝土结构的一种特殊形式，其充分利用了高强混凝土的优点，主要用于输送液体。 目前国内外不少学者对高强混凝土的本构关系做了大量的试验研究，并且给出了高强混凝土比较完整的轴心受压本构关系式；国内外不少学者对钢管高强混凝土的静力性能进行了试验研究，但都没有给出钢管高强混凝土静承载力的统一理论设计公式；且对钢管高强混凝土的动力性能研究也比较少，都没有给出钢管高强混凝土的延性系数计算方法；国内外很多学者对预应力钢管高强混凝土管也做了大量的研究，但是给出的计算方法都是基于弹性体系设计准则，没有给出其塑性弯矩重分布的理论内容。本文针对以上情况，作了如下研究： 应用本文引用的高强混凝土本构关系，利用ABAQUS有限元软件对钢管高强混凝土构件的静力性能进行了模拟，由模拟结果与试验结果吻合良好，证明了模型的正确性和可行性，，确定了高强混凝土在有限元建模中正确的本构关系和正确的参数。钢管混凝土的静承载力只与混凝土的峰值应力有关，因此本文认为钢管高强混凝土的静力设计理论完全可以使用普通钢管混凝土的静力设计理论。在此基础上，本文应用普通钢管混凝土的静承载力计算公式对钢管高强混凝土轴压短柱、轴压长柱和抗弯构件进行了计算，得到计算值、试验值和模拟值吻合良好。 根据数值分析法和极限平衡理论进行了钢管高强混凝土压弯构件滞回性能的分析，修正了普通钢管混凝土压弯构件荷载-位移曲线的骨架曲线模型，并且计算了钢管高强混凝土压弯构件的位移延性系数。 系统地介绍了作用在预应力钢管高强混凝土管上的荷载类型，给出了主要荷载的计算方法和计算公式。给出了在荷载和内压作用下，管道截面轴力和弯矩的计算方法。通过极限轴力和极限弯矩控制，给出了控制截面塑性弯矩重分布的计算理论。通过实例计算和有限元模拟，验证了理论的正确性和可行性。
[Abstract]:High strength concrete has the advantages of low porosity, high density and high compressive strength. However, with the increase of strength and brittleness of high strength concrete, how to make the best use of the advantages of high strength concrete under the condition of overcoming its brittleness has always been a hot research topic. The structural form of high strength concrete filled steel tube in this paper avoids the brittleness of high strength concrete and gives full play to the advantages of high strength concrete. Prestressed steel tube high strength concrete pipe is a special form of hollow steel tube high strength concrete structure. It makes full use of the advantages of high strength concrete and is mainly used to transport liquid. At present, many scholars at home and abroad have done a lot of experimental research on the constitutive relation of high strength concrete, and give a relatively complete constitutive equation of high strength concrete under axial compression. Many scholars at home and abroad have studied the static behavior of high strength concrete filled steel tube (HSC), but have not given the unified theoretical design formula of the static bearing capacity of HSC, and the research on the dynamic performance of HSC is less. Many scholars at home and abroad have also done a lot of research on the prestressed high strength concrete filled steel tube pipe, but the calculation method is based on the design criteria of elastic system. The theoretical content of the plastic moment redistribution is not given. In this paper, the following studies have been done: using the constitutive relation of high strength concrete quoted in this paper, the static behavior of high strength concrete filled steel tube members has been simulated by using ABAQUS finite element software. The simulation results are in good agreement with the experimental results, which proves the correctness and feasibility of the model, and determines the correct constitutive relation and the correct parameters in the finite element modeling of high strength concrete. The static bearing capacity of concrete filled steel tube is only related to the peak stress of concrete, so the static design theory of high strength concrete filled steel tube can be fully used in the static design theory of ordinary concrete filled steel tube. On this basis, the static bearing capacity formula of ordinary concrete filled steel tube is applied to calculate the axial compression short column, axial compression long column and flexural member of high strength concrete filled steel tube. The calculated values are in good agreement with the simulated values. Based on numerical analysis and limit equilibrium theory, the hysteretic behavior of high strength concrete filled steel tubular members is analyzed, and the skeleton curve model of load-displacement curve of ordinary concrete-filled steel tubular members is modified. The displacement ductility coefficient of high strength concrete filled steel tube members is calculated. The load types acting on prestressed steel tube high strength concrete pipe are systematically introduced, and the calculation methods and formulas of main loads are given. The calculation method of axial force and bending moment of pipeline section under load and internal pressure is given. Through the control of ultimate axial force and ultimate bending moment, the calculation theory of controlling plastic moment redistribution of section is presented. The correctness and feasibility of the theory are verified by example calculation and finite element simulation.
【学位授予单位】：哈尔滨工业大学
【学位级别】：硕士
【学位授予年份】：2013
【分类号】：TU398.9
本文编号：2200092
[Abstract]:High strength concrete has the advantages of low porosity, high density and high compressive strength. However, with the increase of strength and brittleness of high strength concrete, how to make the best use of the advantages of high strength concrete under the condition of overcoming its brittleness has always been a hot research topic. The structural form of high strength concrete filled steel tube in this paper avoids the brittleness of high strength concrete and gives full play to the advantages of high strength concrete. Prestressed steel tube high strength concrete pipe is a special form of hollow steel tube high strength concrete structure. It makes full use of the advantages of high strength concrete and is mainly used to transport liquid. At present, many scholars at home and abroad have done a lot of experimental research on the constitutive relation of high strength concrete, and give a relatively complete constitutive equation of high strength concrete under axial compression. Many scholars at home and abroad have studied the static behavior of high strength concrete filled steel tube (HSC), but have not given the unified theoretical design formula of the static bearing capacity of HSC, and the research on the dynamic performance of HSC is less. Many scholars at home and abroad have also done a lot of research on the prestressed high strength concrete filled steel tube pipe, but the calculation method is based on the design criteria of elastic system. The theoretical content of the plastic moment redistribution is not given. In this paper, the following studies have been done: using the constitutive relation of high strength concrete quoted in this paper, the static behavior of high strength concrete filled steel tube members has been simulated by using ABAQUS finite element software. The simulation results are in good agreement with the experimental results, which proves the correctness and feasibility of the model, and determines the correct constitutive relation and the correct parameters in the finite element modeling of high strength concrete. The static bearing capacity of concrete filled steel tube is only related to the peak stress of concrete, so the static design theory of high strength concrete filled steel tube can be fully used in the static design theory of ordinary concrete filled steel tube. On this basis, the static bearing capacity formula of ordinary concrete filled steel tube is applied to calculate the axial compression short column, axial compression long column and flexural member of high strength concrete filled steel tube. The calculated values are in good agreement with the simulated values. Based on numerical analysis and limit equilibrium theory, the hysteretic behavior of high strength concrete filled steel tubular members is analyzed, and the skeleton curve model of load-displacement curve of ordinary concrete-filled steel tubular members is modified. The displacement ductility coefficient of high strength concrete filled steel tube members is calculated. The load types acting on prestressed steel tube high strength concrete pipe are systematically introduced, and the calculation methods and formulas of main loads are given. The calculation method of axial force and bending moment of pipeline section under load and internal pressure is given. Through the control of ultimate axial force and ultimate bending moment, the calculation theory of controlling plastic moment redistribution of section is presented. The correctness and feasibility of the theory are verified by example calculation and finite element simulation.
【学位授予单位】：哈尔滨工业大学
【学位级别】：硕士
【学位授予年份】：2013
【分类号】：TU398.9
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本文编号：2200092
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