预应力混凝土梁受剪性能研究
[Abstract]:According to the disease investigation of long span prestressed concrete box girder bridge, it is often a "complication" that the overlong span deflection and the inclined crack of web plate are often "complications". The web oblique crack is a structural crack, which belongs to the basic theory of shear. At present, the existing tests of shear behavior of concrete at home and abroad focus on the research of bearing capacity, pay little attention to the influence of shear deformation after the occurrence of oblique cracks, and there is no unified theory to reflect the shear behavior of concrete structures completely. In this paper, the shear capacity of reinforced concrete and prestressed concrete beams is studied based on the basic shear theory of concrete structures, and the influence of shear deformation on the deflection of prestressed concrete beams is studied. Finally, the effect of inclined crack development on the deflection of real bridge span is quantitatively analyzed in finite element software. The main achievements of this paper are as follows: (1) the shear test data of 216 reinforced concrete beams with web reinforcement are collected, and the shear bearing capacity with shear span ratio, effective height of section, compressive strength of concrete and ratio of longitudinal reinforcement are analyzed and discussed. The basic law of the change of the hoop characteristic value and other factors. Based on the truss-arch model and considering the condition of deformation coordination, a formula for calculating the shear capacity of reinforced concrete beams considering the effect of total shear span ratio is derived. The statistical eigenvalue method and the influence factor method are used to analyze and compare the calculation results of the suggested method and the design codes of various countries. The results show that the proposed method has a high prediction accuracy. (2) based on truss-arch model, the proposed method is based on the truss-arch model. Considering the effect of prestress and compression flange on the shear capacity, the formulas for calculating the shear capacity of prestressed concrete beams with web reinforcement are derived. The shear test data of 115 prestressed concrete beams with web reinforcement are collected, and the shear bearing capacity with shear span ratio, the effective height of section, the compressive strength of concrete and the ratio of longitudinal reinforcement are analyzed and discussed. The basic law of the change of the characteristic value of the hoop and the preloading stress at the center of the cross section. The statistical eigenvalue method and the influence factor method are used to analyze and compare the calculation results of the suggested method and the design codes of various countries. The results show that the proposed method has a high prediction accuracy. (3) the effect of tensile stress on concrete between inclined cracks is taken into account. The formula of effective shear stiffness of prestressed concrete beam is derived. According to the shear behavior tests of 6 prestressed concrete rectangular beams and 4 I-shaped test beams in the literature, the applicability of the proposed effective shear stiffness calculation method is verified. The bending deformation calculated by GB 50010-2010 is compared with that calculated by code GB 50010-2010. The results show that the shear deformation of prestressed concrete thin web beam after diagonal cracking can not be ignored. In addition, the angle of curved prestressed reinforcement, the ratio of reinforcement to reinforcement, the ratio of shear span to span, the ratio of span to height, the effective prestressing force are analyzed and evaluated. The influence of concrete compressive strength and hoop ratio on the shear deformation after the occurrence of oblique cracks. (4) taking the continuous rigid frame of prestressed concrete of Sutong Bridge as the background, the shrinkage and creep of concrete are compared and analyzed by using the finite element analysis software MIDAS/Civil,. The influence of prestress loss and inclined crack development on the midspan deflection of long span box girder bridge. The results show that the selection of shrinkage and creep mode has a great influence on the deflection in the span, and the prestress loss of the cantilever in the prestressing beam has the most obvious effect on the deflection in the span. However, the influence of shear deformation on the deflection in the span can not be ignored after the oblique crack appears.
【学位授予单位】:东南大学
【学位级别】:硕士
【学位授予年份】:2015
【分类号】:TU378.2
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