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首页> 外文期刊>Journal of structural engineering >Chord Sidewall Failure of RHS X-Joints in Compression and Associated Design Recommendations
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Chord Sidewall Failure of RHS X-Joints in Compression and Associated Design Recommendations

机译：CHORD侧壁的RHS X-Chects压缩和相关的设计建议

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摘要

In this study, the behavior of rectangular hollow-section (RHS) X-joints in compression is investigated, with a focus on the failure mode of chord sidewall failure, which is more likely to occur when the brace-to-chord width ratio is close to 1.0. For joints with a width ratio of 1.0 (or full-width joints), the test-backed numerical analysis in this study clearly indicated that sidesway instability could readily occur even if sufficient out-of-plane restraint is provided. The sidesway instability was found to considerably impair the ultimate strength of full-width joints. A new borderline width ratio is proposed, beyond which the chord face plastification and chord sidewall failure limit states start to interact and should be considered simultaneously in the joint design. This investigation was motivated by a previous experimental observation, wherein the failure mode of the tested joints with a borderline width ratio of 0.85 as per current design standards was essentially the less ductile chord sidewall buckling observed in full-width joints. Based on simple mechanics, an analytical and more rational expression for the borderline width ratio is derived and validated in this study. After existing formulas for the chord sidewall strength were thoroughly reviewed and all the findings and developments were collated, an improved design recommendation that can cover high-strength steels whose yield stress is as high as 700 MPa is suggested for RHS X-joints under brace axial compression. (C) 2021 American Society of Civil Engineers.
机译：在该研究中，研究了压缩中的矩形空心部分（RHS）X关节的行为，重点关注弦侧壁故障的故障模式，当支架到和弦宽比是时更可能发生接近1.0。对于宽度比为1.0（或全宽接头）的关节，本研究中的测试备份数值分析清楚地表明即使提供了足够的平面外限制，也可以容易地发生侧面不稳定性。发现侧往不稳定性会造成很大损害全宽关节的最终强度。提出了一种新的边界宽度比，超出了和弦面部塑化和弦侧壁故障限制状态的开始互动，并且应该在关节设计中同时考虑。该研究是通过先前的实验观察的动机，其中根据当前设计标准的具有0.85的边界宽度比的测试接头的故障模式基本上是在全宽接头中观察到的延展性弦侧壁弯曲。基于简单的力学，在本研究中衍生和验证了对边界宽度比的分析和更合理的表达。经过彻底审查和弦侧壁强度的现有公式，并进行所有调查结果，改进的设计推荐，可以覆盖屈服应力高达700MPa的高强度钢的设计推荐，在支架轴向下的RHS X关节建议压缩。 （c）2021年美国土木工程师协会。

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  • 来源
    《Journal of structural engineering》 |2021年第8期|04021111.1-04021111.23|共23页
  • 作者

    Kim Seon-Hu; Lee Cheol-Ho;

  • 作者单位

    Seoul Natl Univ Dept Architecture & Architectural Engn Seoul 08826 South Korea;

    Seoul Natl Univ Dept Architecture & Architectural Engn Seoul 08826 South Korea;

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