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Experimental Study and Analysis of Reinforced Concrete Filled Steel Tubular Outsourcing

Author: YuYang
Tutor: XuFengYun；XiangZhongFu
School: Chongqing Jiaotong University
Course: Bridge and Tunnel Engineering
Keywords: Concrete Filled Steel Tubular Capacity analysis Finite Element
CLC: TU398.9
Type: Master's thesis
Year: 2010
Downloads: 77
Quote: 0
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Abstract

In recent years, the steel pipe concrete structure to flourish in our country, especially CFST Arch Bridge. CFST arch bridge across the span limit while related research, especially its reinforcement is less and less. Steel pipe concrete structure reinforcement of CFST Arch Bridge construction and maintenance in the future will provide a strong theoretical technical support. Bearing capacity of concrete filled steel tubular structure is the relationship between security and economic factors. How to improve the bearing capacity of concrete filled steel tubular structure became very concerned about the problems of the engineering community. Ultimate bearing capacity of concrete filled steel tubular generally depends on the experimental study and numerical analysis, by means of large-scale basic stability issues can be resolved within the elastic, but due to the physical properties of the material itself, the bearing capacity of the impact parameter and the bridge itself the complexity and diversity of the initial defects factors generally difficult to accurately calculate the ultimate bearing capacity evaluation of steel pipe concrete arch bridge state. Simultaneously by nonlinear initial stress, initial defects and other influencing factors coupling uncertainties calculated analysis of complex, often calculated forecast bridge structure bearing capacity reduced, to some extent, so that the calculation of loss guidance meaning, to the construction and use of CFST arch bridge structure brings risks. Therefore, there is an urgent need for steel pipe concrete structure and reinforced. In this paper, on the basis of existing research, carried out the steel concrete reinforcement and load analysis. ANSYS finite element secondary development the ADPL language programming, nonlinear rational use of ANSYS software, multi-unit, multi-parameter selection and powerful post-processing multi-parameter function, a unit of steel pipe concrete structure - CFT stub columns . This article studies the main results are as follows: ① summarizes the development of steel pipe concrete structure and steel pipe concrete structure bearing capacity, focusing on the non-linear theory of the steel pipe concrete pole early stress theory, theory of initial defects and its constitutive relations; describes the principles and methods of large finite element analysis software ANSYS software, and laid the foundation for ANSYS software analysis. (2) coat steel pipe concrete through experimental studies on the role of reinforcement of concrete structures of the original steel pipe, and on the basis of existing research, the definition of steel pipe concrete structure axial compression capacity formula, and derivation of Concrete Filled Steel Tubular the jacket steel pipe concrete reinforcement bearer force calculation formula. ③ This paper analyzes a situation three specimen ultimate load analysis, the internal strength of the steel pipe with ANSYS concrete level, and the ratio of the steel to control its carrying capacity, the steel pipe inside and outside the larger the size effect , carrying capacity is higher. Elastic stage, the higher the concrete strength, the higher the ratio of the steel, the bearing capacity is lower, the higher the ratio of the steel in the elastic-plastic and plastic stage, the higher the carrying capacity. ④ analysis to verify the reinforcement effect through examples, derived reinforced bearing capacity significantly improved, but how to practice outside diameter, wall thickness, as well as the level of concreting reasonable choice according to the actual situation. The article suggests the inside and outside steel pipe diameter cross-ratio of 1.5 to 2.5 for the best the best steel ratio of 8% to 20%.

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