Practical Toughness Design Formulas for Steel Beam-columns

实用钢梁柱韧性设计公式

• 批准号: 59850097
• 负责人: NAKAMURA Tsuneyoshi
• 金额: $ 6.08万
• 依托单位: Kyoto University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Developmental Scientific Research
• 财政年份: 1984
• 资助国家: 日本
• 起止时间: 1984 至 1985
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-59850097/
• 关键词: Steel frame; Beam-column; Toughness design formula; Repeated bending; Convergent behavior; Divergent behavior; Symmetry limit; 定常状態限界

The purpose of this project is to derive a rational and practically useful set of toughness design formulas for steel beam-columns on the basis of the critical combinations of state parameters which characterize the new critical behaviors found by the present investigators. The following results have been obtained:(1) The symmetry limit theory for idealized cantilever beam-columns due to the senior investigators has been extended to the theory for beam-columns with biaxially symmetric cross-sections obeying a set of non-stationary hysteretic stress-strain relations. It has been demonstrated that the symmetry limit amplitudes of a steel beam-column predicted by the extended theory agree very closely with those obtained by an accurate analysis of its hysteretic behavior.(2) The effects of second-order factors on the symmetry limit have been investigated on the basis of the symmetry limit theory. The following characteristics have been found.(1) The symmetry limit curve for a beam-column … More obeying a skeleton curve with a yield plateau has a discontinuity.(2) The symmetry limit amplitude is always and slightly increased by the presence of residual stresses.(3) Local buckling deformation of a flange of a beam-column of a square tube may increase or decrease the symmetry limit amplitude depending upon the state parameters.(3) A steady-state limit theory has been developed on a beam-column with an arbitrary (biaxially) symmetric cross-section obeying the nonlinear stress-strain relations in (1). It has been proved that a symmetry limit curve is a good approximation of the corresponding steady-state limit curve from the safe side.(4) Model steel beam-columns of square tubes have been subjected to a program of completely reversed bending of stepwisely increasing amplitudes under constant axial compression. It has been demonstrated that the symmetry limit curve due to the theory provides fairly good predictions of the experimental results.(5) The symmetry limit curve on a plane of axial force ratio and nominal slenderness ratio for a sufficiently large value of the prescribed tip deflection amplitude has been obtained and proposed as a design fundamental curve. Less

本课题的目的是根据目前研究人员发现的表征新的临界行为的状态参数的临界组合，推导出一套合理的、实用的钢梁柱韧性设计公式。（1）将前人提出的理想悬臂压弯构件的对称极限理论推广到双轴对称截面压弯构件的非定常滞回理论。结果表明，用扩展理论预测的钢梁柱对称极限振幅与精确分析其滞回性能得到的对称极限振幅非常接近。(2)基于对称极限理论，研究了二阶因子对对称极限的影响。已发现以下特征。(1)梁柱对称极限曲线 ...更多信息 服从具有屈服平台的骨架曲线具有不连续性。(2)残余应力的存在总是会使对称极限振幅略有增加。(3)方管梁柱翼缘的局部屈曲变形会使对称极限幅值增大或减小，这取决于状态参数。(3)本文建立了一个适用于任意（双轴）对称截面的梁柱的稳态极限理论，该理论满足文献（1）中的非线性应力-应变关系。证明了对称极限曲线是相应的稳态极限曲线的安全近似。(4)本文对模型方钢管梁柱进行了在恒定轴压作用下逐步增幅的完全反向弯曲试验。它已被证明，由于理论的对称极限曲线提供了相当好的预测的实验结果。(5)在轴力比和名义细长比的平面上的对称极限曲线已获得足够大的规定的尖端偏转振幅的值，并建议作为设计的基本曲线。少

项目成果

Proceedings of Annual Meeting of the Architectural Institute of Japan. (1984)

日本建筑学会年会论文集。

日本建築学会論文報告集. 346. (1984)

日本建筑学会会刊346。（1984）

Proceedings of Annual Meeting of the Architectural Institute of Japan. (1985)

日本建筑学会年会论文集。

日本建築学会大会学術講演梗概集. (1985)

日本建筑学会会议学术讲座摘要（1985）。

Proceedings of the 35th Japan National Congress of Theoretical and Applied Mechanics. (1985)

第 35 届日本全国理论与应用力学大会论文集。