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首页> 外文期刊>International journal of steel structures >Behavior of Partially Concrete Encased Steel Beams Under Cyclic Loading
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Behavior of Partially Concrete Encased Steel Beams Under Cyclic Loading

机译：循环荷载下部分包裹钢梁的性能

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摘要

This paper presents an experimental study of the behavior of partially concrete encased steel beams (PE beams) under seismic loading. The effects of a floor slab in providing lateral and torsional support to the strength and ductility of the beam are also investigated herein. One steel beam and six PE beams were tested herein. The strength development in bare steel beam was insufficient and significant lateral torsional buckling (LTB) was observed. The concrete encasement of the PE beam delayed the occurrence of LTB and hence increased the strength and ductility of the beam. The plastic rotation capacity of PE beam is enhanced by the additional lateral and torsional support provided on the top of a PE beam. For the beam tested in this study, the concrete encasement permits the beam to reach its plastic strength and have plastic rotation of at least 3.42% rad, which is larger than 2% rad required for Intermediate Moment Frames, when no lateral or torsional support is provided at the top of the beam. To satisfy the 4% rad plastic rotation limitation for special moment frames, lateral support with sufficient torsional stiffness is needed.
机译：本文提出了在地震荷载下部分混凝土包裹的钢梁（PE梁）性能的实验研究。本文还研究了楼板在为梁的强度和延展性提供侧向和扭转支撑方面的作用。在此测试了一根钢梁和六个PE梁。裸钢梁的强度发展不足，并且观察到明显的横向扭转屈曲（LTB）。 PE梁的混凝土包裹延迟了LTB的发生，因此提高了梁的强度和延展性。 PE梁顶部的附加横向和扭转支撑提高了PE梁的塑性旋转能力。对于本研究中测试的梁，混凝土外壳允许梁达到其塑性强度，并且在没有侧向或扭转支撑的情况下，其塑性旋转至少为3.42 rad的弧度，大于中间矩框架所需的2 rad弧度。提供在梁的顶部。为了满足特殊力矩框架的4％rad塑性旋转限制，需要具有足够扭转刚度的侧向支撑。

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