中国铁道科学2011，Vol.32Issue(6)：48-54,7.
内填外包钢管混凝土小偏心受压构件极限承载力分析
Analysis on the Ultimate Bearing Capacity of Small Eccentric Compression Component of Steel Tube with Infilled and Outer Concrete
摘要
Abstract
The reinforced concrete deck arch of Lancang River Da-Rui Railway bridge with a main span of342 m is taken as background, a straight short column physical model representative of arch top section is designed. Based on elastic-plastic mechanics principle and considering material nonlinearity, an iterative numerical algorithm for analyzing the ultimate bearing capacity of the cross section of the short steel tube with infilled and outer concrete column subject to eccentric compressive loading is developed. The ultimate bearing capacity is determined with the developed algorithm and ANSYS solid-element-based analysis. It is shown that the bearing capacity of the eccentric compression component of steel tube with infilled and outer concrete is controlled by the outer concrete. Although the strength of the inner concrete has been increased to a certain extent, the inner concrete does not represent the confinable effect as developed in the pure concrete filled steel tube. When the load remains constant, the ultimate bearing capacity of the com-ponent tends to decrease with the increase of eccentricity (keeping small eccentricity invariant under compression). But it has higher capacity to resist the bending moment. The ultimate load coefficient at the cross section of bridge arch top is above 3. 0, which is far greater than the safety factor of 2. 0 required by the design code. It indicates that the cross section of the bridge arch top is safe enough. The difference in the results obtained from the developed algorithm and ANSYS is less than 6%. The results of the ultimate bearing capacity of the cross section obtained by the iterative numerical algorithm are slightly smaller, but can fully meet the requirements for engineering precision. It is concluded that the developed method can be reliably applied to calculate the ultimate bearing capacity of this kind of components in engineering application.关键词
内填外包钢管混凝土/小偏心受压构件/极限承载力/材料非线性Key words
Steel tube with infilled and outer concrete/Small eccentric compression component/Ultimate bearing capacity/Material nonlinearity分类
交通工程引用本文复制引用
盛兴旺,杨鹰,黑文豪..内填外包钢管混凝土小偏心受压构件极限承载力分析[J].中国铁道科学,2011,32(6):48-54,7.基金项目
铁道部科技研究开发计划项目(2008G023-C) （2008G023-C）
