波形鋼腹板箱梁橋內(nèi)力重分布研究
[Abstract]:The corrugated steel web box girder bridge is a new type of steel-concrete composite structure, which makes the corrugated steel webs and concrete give full play to their respective characteristics while working, plus the use of external prestressing technology. The mechanical characteristics of prestressed concrete box girder bridge are different from that of ordinary prestressed concrete box girder bridge. In this paper, the finite element model of the model beam is modeled, and the redistribution of internal force is analyzed and calculated in detail. (1) according to the research results of the previous scholars on the stress characteristics of the corrugated steel web plate bridge, The development and stress characteristics are summarized and summarized. At the same time, the concept of plastic internal force redistribution and the present situation of research and development are expounded. The calculation of moment amplitude modulation method and stress increment in domestic and foreign codes and literatures are summarized. (2) the whole process from loading to failure of a two-span continuous beam is analyzed, and the three stages of beam working process are expounded. The internal force redistribution of prestressed concrete continuous beam is summarized as two processes. This paper summarizes the research and analysis methods of internal force redistribution in continuous beams, which include plastic hinge method, variable stiffness method, whole process analysis method and moment amplitude modulation method. There are many factors that influence the redistribution of internal force. Many scholars combine theoretical analysis with experiments, mainly with crack development, secondary moment produced by prestress, plastic hinge, The bearing capacity of oblique section is related to the ultimate stress increment of unbonded steel bars. (3) the modeling model, the choice of constitutive relation of element and material for corrugated steel web box girder bridge using ANSYS software are described. According to the characteristics of the bridge type and the purpose of simulation, the dispersion crack model is used to obtain the load-displacement characteristic curve of the structure. The modeling of corrugated steel web is realized based on APDL language. Taking a single span simply supported beam as an example, the modeling program command is given. (4) the separated calculation model of simply supported test beam is established and the finite element analysis of ultimate bearing state is carried out. The whole process from loading, yielding to failure of simply supported beam with corrugated steel web under concentrated load is discussed. From the results of finite element calculation, it can be seen that the numerical results of this paper can well reflect the working characteristics of three broken lines of corrugated steel web composite beams. The data of stress and mid-span deflection of external prestressed tendons are listed and the curve is fitted. The results show that the stress increment and mid-span deflection are basically linear relations. (5) taking 2 脳 40m continuous beam as model beam, the reinforcement ratio of ordinary steel bar is a variable. The load-displacement curves of the mid-span and the load-stress curves of the internal and external prestressing tendons under concentrated load are analyzed. The influence of the reinforcement ratio on the ultimate load-carrying capacity of continuous beams is qualitatively analyzed. Based on the stress-load curve at the negative moment region, the law of internal force redistribution under different reinforcement ratios is analyzed. The data and curves of stress increment and mid-span deflection of external prestressed tendons with different reinforcement ratios are given, and the effect of reinforcement ratio on stress increment is analyzed. Finally, the moment amplitude modulation coefficient of continuous beam and the ultimate bearing capacity of the model beam are given from loading to failure, and the reason why the moment amplitude modulation coefficient decreases with the increase of reinforcement ratio is given.
【學(xué)位授予單位】:西南科技大學(xué)
【學(xué)位級(jí)別】:碩士
【學(xué)位授予年份】:2017
【分類號(hào)】:U441
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