體外預(yù)應(yīng)力混凝土簡(jiǎn)支梁承載能力極限狀態(tài)下的受彎性能研究
[Abstract]:The most important feature of external prestressed concrete structure is that the prestressed tendons are arranged outside the beam body and connected to the structure only at the anchor end or steering block. Compared with the internal prestressed concrete structure, it has the advantages of simplifying the stretching procedure, reducing the friction loss, facilitating the pouring, replacing and checking the external reinforcing bar, etc. It has been widely used in engineering practice, but its theoretical research is not perfect. Based on the existing research results, this paper studies the calculation method of external prestressed concrete simply supported beam under the limit state of bearing capacity. The main work is as follows: 1. This paper analyzes and summarizes the stress characteristics of externally prestressed concrete simply supported beams when they reach the ultimate state of bearing capacity and the main factors affecting their mechanical properties. 2. The bond between external prestressed concrete structures and ordinary concrete structures is analyzed. The differences between unbonded prestressed concrete structures and cable-stayed prestressed structures and their advantages and disadvantages. 3. Using ANSYS software, considering material nonlinearity and geometric nonlinearity, finite element simulation analysis of externally prestressed concrete simply supported beams is carried out. By comparing the calculated value with the experimental value, the feasibility of using finite element program to analyze the mechanical properties of externally prestressed concrete simply supported beam is verified. The calculated data can be used as a supplement to the experimental data. 4. According to the theory of concrete plastic hinge, The coupling relationship between the whole deformation of beam and the deformation of external prestressing tendons is studied. Under the assumption that the deformation of beam body is broken line and arc under the limit state of bearing capacity, the beam with no steering block and straight line is deduced. One steering block and a straight-line stiffened beam, two steering blocks and a straight-line stiffened beam, The stress calculation formulas of external prestressed concrete beams with one steering block and broken line reinforced beam and two steering blocks with broken line reinforcement beam under the limit state of bearing capacity are presented and the corresponding solution methods are presented (respectively). Abbreviated as the broken line method and the arc method). Then, five externally prestressed concrete test beams with different types of tendons are calculated by using these two methods, and compared with the experimental values, the applicability of the calculation method is studied. A formula for calculating ultimate flexural capacity of externally prestressed concrete beams considering secondary effect is established. By using the broken line method and the arc method established in this paper, the same test beam is calculated under the condition of considering the quadratic effect and not considering the quadratic effect. The effect of secondary effect on ultimate bearing capacity of externally prestressed concrete beams is analyzed.
【學(xué)位授予單位】:福州大學(xué)
【學(xué)位級(jí)別】:碩士
【學(xué)位授予年份】:2014
【分類(lèi)號(hào)】:U441
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