Development of Experimental Systems for Simulation of Complete Failures of Steel Structures Subjected to Earthquake Loading

地震荷载下钢结构完全破坏模拟实验系统的开发

• 批准号: 11555150
• 负责人: NAKASHIMA Masayoshi
• 金额: $ 8.83万
• 依托单位: KYOTO UNIVERSITY
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 1999
• 资助国家: 日本
• 起止时间: 1999 至 2001
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-11555150/
• 关键词: Complete Failure; Damage Evaluation; Structural Testing; On-Line Control Test

This study focuses on development of experimental techniques for the simulation of complete failures of structures subjected to earthquake loading. An experimental system that consists of very large stroke loading jacks, high resolution digital displacement transducers, and on-line digital computer control was developed. Using the system developed, tests were conducted for the simulation of complete failures of steel beams and columns. Here, complete failure was defined such that the member was fractured and separated completely and/or the member loses the capacity of sustaining gravity load. The major findings obtained from the tests are as follows.(1) Strong geometrical nonlinearity changed the mode of beam resistance from flexure to axial elongation/contraction.(2) This change of mode generated additional resistance even after the beam sustained significant damage.(3) Complete failure of steel columns was governed by the growth of cracks and succeeding fractures of the section.(4) A certain amount of axial load retarded the initiation and growth of cracks, which assist the increase of column capacity to complete failure. Numerical analysis using the finite element method was performed to simulate the experimental results, and it was found that the analysis is effective even in the regime of strong geometrical nonlinearity but fails to simulate the experimental behavior once the member topology is altered significantly.

本研究的重点是开发模拟地震荷载下结构完全失效的实验技术。开发了一个由超大行程加载千斤顶、高分辨率数字位移传感器和在线数字计算机控制组成的实验系统。使用开发的系统，进行了模拟钢梁和钢柱完全失效的测试。这里，完全失效的定义是构件完全断裂和分离和/或构件失去承受重力载荷的能力。测试得到的主要结果如下：（1）强烈的几何非线性将梁的阻力模式从弯曲改变为轴向伸长/收缩。（2）这种模式的变化即使在梁遭受严重损坏后也会产生额外的阻力。（ 3)钢柱的完全破坏由裂纹扩展和截面后续断裂控制。(4)一定量的轴向荷载延缓了裂纹的萌生和扩展,有利于柱完全破坏能力的增加。使用有限元方法进行数值分析来模拟实验结果，发现即使在强几何非线性的情况下，该分析也是有效的，但一旦构件拓扑发生显着改变，就无法模拟实验行为。

项目成果

Kanao, I., Nakashima, M. and Liu, D.: "Lateral Buckling Behavior and Lateral Bracing of Wide-Flange Beams Subjected Cyclic Loading"Journal of Structural and Construction Engineering, the Architectural Institute Japan. 544. 147-154 (2001)

Kanao, I.、Nakashima, M. 和 Liu, D.：“承受循环荷载的宽翼缘梁的横向屈曲行为和横向支撑”日本建筑学会结构与建筑工程学报。

Kanao, I., Liu, D. and Nakashima, M.: "Lateral Buckling. And Post-Buckling Behavior of Standard and RBS Steel Beams Subjected Cyclic Loading"Joumal of Constructional Steel. Vol.9. 551-556 (2001)

Kanao, I.、Liu, D. 和 Nakashima, M.：“标准钢梁和 RBS 钢梁承受循环载荷的横向屈曲和后屈曲行为”建筑钢杂志。

Nakashima M.: "Development, Potential, and Limitations of Real-Time Online Test"Proceedings of the International Symposium on Theory and Application of Structural Engineering Test Method, Beijing. 8-15 (1999)

Nakashima M.：“实时在线测试的发展、潜力和局限性”结构工程测试方法理论与应用国际研讨会论文集，北京。

Liu, D.: "Lateral buckling, post-buckling instability, and fracture of steel beams subjected to large cyclic deformations"Proceedings of the US-Japan Seminar on Advanced Stability and Seismicity Concept for Peformance-based Design of Steel and Composite S

刘丹：“大循环变形下钢梁的侧向屈曲、屈曲后失稳和断裂”美日钢与复合材料性能设计先进稳定性与抗震概念研讨会论文集

劉大偉: "鋼梁の完全崩壊挙動"鋼構造年次論文報告集. 第9巻. 557-562 (2001)

刘大伟：《钢梁的完全倒塌行为》钢结构年报第9卷（2001）。