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Design Parameter Research on Long-span PC Continuous Rigid Frame Bridge

Author: BaiRongRong
Tutor: MeiKuiHua
School: Chang'an University
Course: Architecture and Civil Engineering
Keywords: Prestressed Concrete Continuous Rigid Frame Bridge Design parameters Numerical Analysis
CLC: U448.23
Type: Master's thesis
Year: 2011
Downloads: 88
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Abstract


Span prestressed concrete continuous rigid frame bridge design parameter selection is critical in the entire rigid frame bridge design values ??is reasonable or not directly affect the performance of the dead weight of the structure and force. Therefore, to carry out large-span prestressed concrete continuous rigid frame bridge design parameters of great significance to the study of such bridge construction. First, we carry out a large span prestressed concrete continuous rigid frame bridge bottom curve power relations. With an example, three representative numerical model to analyze and compare the stress and displacement of the key sections of the main beam in the power relations between different beam bottom curve under the dead weight and car loads. Secondly, to carry out a study of large-span prestressed concrete continuous rigid frame bridge span ratio. Summary and analysis of the domestic and foreign high beam bridge cross than the value of experience and the characteristics were established 3 fulcrum span ratio and three cross cross than the numerical model, analysis and comparison of the different high-span ratio under the main beam sectional and in The stress and displacement under dead weight and car loads. Then, to carry out a large-span prestressed concrete continuous rigid the longitudinal prestressing frame bridge forms of research. With an example, three representative numerical model to analyze the state of the compare different span prestressed concrete continuous rigid frame bridge webs beam anchor position led to key sections of the main beam in the largest state of the double cantilever and bridge stress, internal forces and displacements. Finally, to carry out a large-span prestressed concrete continuous rigid frame bridge on the main pier stiffness rationality. With an example, to optimize the design parameters of the double thin-wall pier, three representative numerical model, analysis and comparison of the key sections of different double thin-wall pier spacing under the main beam under its own weight and car loads of stress. displacement. Through the above study made a number of conclusions: the power beam bottom curve relationship studies have shown that the beam bottom curve of increase in the power of effective to reduce the main beam self-weight, but will increase the stress and displacement of part of the cross-section of the main beam. Span ratio studies have shown that the fulcrum high cross than reducing the sectional stress and displacement of the main girder section will result in an unfavorable direction, the force structure is very unfavorable; cross in high cross ratio decreases near the main beam cross-section uneven force Lee easily be prestressed offset. Form of longitudinal prestressing studies have shown that large span continuous rigid frame bridge web beams need to set the next bend, the web beam bending anchor position in the ideal location 2H / 3. The main pier stiffness reasonable, with dual thin-walled pier spacing decreases, box slight increase in weight and lane loads under stress and displacement, the thin-walled pier spacing is neither too big nor too small.

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CLC: > Transportation > Road transport > Bridges and Culverts > All kinds of bridges > Bridge: Structure > Rigid Frame Bridge
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