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首页> 外文期刊>Engineering Structures >The non-linear model of embedded steel-concrete composite column bases
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The non-linear model of embedded steel-concrete composite column bases

机译：嵌入式钢-混凝土组合柱基础的非线性模型

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摘要

This paper analyses the base connection of partially encased composite columns while considering the solution of embedding the column in a concrete foundation block. The base connection is formed by a socket-type joint that is used for RC pre-cast columns, avoiding the brittle failure that usually occurs in traditional base joints made of plates and bolts due to crashing of the welds and degradation of the bonding. The experimental results from previous tests showed that the innovative joint is more ductile than the traditional joint, but the detailed analysis developed in this paper demonstrates that the fixed end rotation contributes to the global ductility of the joint. A non-linear 3D FE model is constructed and calibrated from the experimental results and is then used for parametric analyses. The influence of the embedded height is examined by determining its value that exploits the entire resistance of the column before the base concrete fails. Another parametric study using the 3D FE model is performed to define the elastic rigidity of the connection. Finally, a simple mono-dimensional model is assessed with a non-linear spring at the base that takes into account the elastic rigidity and the plastic behaviour of the base joint.
机译：本文分析了部分包裹的复合柱的基础连接，同时考虑了将柱嵌入混凝土基础砌块中的解决方案。基础连接是由用于RC预制柱的承插式接头形成的，避免了传统的由板和螺栓制成的基础接头由于焊缝的碰撞和结合力的降低而发生的脆性破坏。先前测试的实验结果表明，创新型接头比传统接头更具延展性，但本文进行的详细分析表明，固定端旋转有助于接头的整体延展性。根据实验结果构建并校准了非线性3D FE模型，然后将其用于参数分析。通过确定在基础混凝土失效之前利用柱的整个阻力的值来检查埋入高度的影响。使用3D FE模型进行的另一项参数研究定义了连接的弹性刚度。最后，在基座上使用非线性弹簧评估一个简单的一维模型，该模型考虑了基座接头的弹性刚度和塑性行为。

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