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The Finite Element Analysis on Hysteretic Characteristics of Steel Reinforced Concrete Columns

Author: TangXiaoFang
Tutor: ChenHaoJun
School: Changsha University of Science and Technology
Course: Structural Engineering
Keywords: Steel Reinforced Concrete Columns axial compression ratio hysteretic characteristics finite element limited values of axial compress ratio
CLC: TU398.9
Type: Master's thesis
Year: 2007
Downloads: 290
Quote: 5
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Abstract

How enhances the aseismatic ability of structure is one of the most interesting engineering aspects, this research has the important theory significance. With the development of modern construction, the height and the span of building are on the increase, the traditional structures of reinforced concrete can not meet requirements of the modern construction. If reinforced concrete columns are still applied in the high-rise building, it will result in increased size of columns section because of big axial compression and limits of axial compression ratio. This not only affects service function, but also may become short columns whose seismic behavior is poor. It is made known by a lot of experiments that steel reinforced concrete columns can effectively reduce the axial compression ratio of column’s concrete part and improve seismic behavior of the columns, as a result of steel staring a part of axial load. So the steel reinforced concrete columns will be the main structural form in the next ultra-tall buildings, at present,the research is imperfect to this kind of new built-up section system. On the existing research results, under low-cycle reciprocal load, with ANSYS program, to the steel reinforced concrete columns with several load forms, this article produces a systemic academic analysis to hysteretic characteristics. Main research work as follows:Steel reinforced concrete columns with the same size and steel match are designed in this thesis, because the core steel in the steel reinforced concrete column can bear the vertical loads independently, then the traditional model that the steel and the concrete bear the compressive force of the column cross homogeneously is changed, and the mode that the steel bear the compressive force first then the concrete casting can fully increases the utilization ratio of the steel, finally the asesmatic behavior researches of the structures are taken on these basis.(1)、Simulating the steel reinforced concrete columns ANSYS finite element model, give the level low-cycle reciprocal load under different situation. the steel and concrete are simulated by the three dimensional entity unit, the contact surface is simulated by the contact unit.(2)、Based on the contrast analysis on hysteretic curve of the columns, it examines their hysteretic characteristics.(3)、Based on the hysteretic curve of the columns, analyzes ductility of steel reinforced concrete columns, obtains the ductility coefficient under diverse axial compression ratio (4)、The limited values of axial compress ratio are analyzed

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