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首页> 外文期刊>International journal of steel structures >Effect of chord configuration and spacing on cyclic flexural response of built-up columns
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Effect of chord configuration and spacing on cyclic flexural response of built-up columns

机译：弦的配置和间距对组合柱的循环弯曲响应的影响

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摘要

As per the current codes of practice, the design of battens of a built-up steel column depends on the level of axial load. These columns may not reach their plastic moment capacities under the lateral loading due to the premature instability of main chords in the expected plastic hinge regions. In this study, the cyclic performance of built-up battened columns is analytically evaluated under the gradually-increasing lateral displacements and the constant axial loads using a finite element software ABAQUS. The main parameters varied are the chord spacing, the column slenderness ratio, the level of axial load, and the chord configuration. Ninety-eight FE models of battened columns are analysed in this study in which the hot-rolled steel channel or I-Sections are used as the main chords. The analytical results showed that the built-up columns made up from I-sections have better lateral strength and ductility as compared to the Channel sections for nearly same values of axial load and slenderness ratio. Based on the analytical results, the limiting values of chord spacing, slenderness ratio and level of axial loads are proposed in order to delay the effect of instability on their lateral load resistance. Further, the interaction between axial load-moment capacity of built-up columns is discussed for various types of chord configurations.
机译：根据当前的操作规范，组合钢柱的板条设计取决于轴向载荷的水平。由于预期的塑料铰链区域中主弦的过早不稳定，这些圆柱在横向载荷下可能无法达到其塑性矩承载力。在这项研究中，使用有限元软件ABAQUS在逐渐增加的侧向位移和恒定的轴向载荷下，分析了组合式板条柱的循环性能。改变的主要参数是和弦间距，列细长比，轴向载荷水平和和弦配置。本研究分析了板条柱的98个有限元模型，其中以热轧钢槽钢或I型截面为主要弦。分析结果表明，与I形截面相比，由I形截面组成的组合柱在轴向载荷和细长比值几乎相同的情况下具有更好的侧向强度和延展性。根据分析结果，提出了弦距，细长比和轴向载荷水平的极限值，以延迟不稳定性对其横向载荷阻力的影响。此外，针对各种类型的弦配置，讨论了组合柱的轴向载荷-弯矩承载力之间的相互作用。

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