Strength Deterioration of Steel Structures considering the Strain Concentration caused by the Dynamic Localization of Buckling Patterns

考虑屈曲模式动态局部化引起的应变集中的钢结构强度劣化

• 批准号: 09650526
• 负责人: GOTO Yoshiaki
• 金额: $ 1.66万
• 依托单位: Nagoya Institute of Technology
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 1997
• 资助国家: 日本
• 起止时间: 1997 至 1998
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-09650526/
• 关键词: localization of buckling patterns; steel structure; earthquake; constitutive model; dynamic analysis; shell; plasticity

A computer program is developed in order to analyze the dynamic localization of buckling patterns for thin-walled steel structures. in this program, the three-surface cyclic plasticity constitutive model is implemented. This constitutive model can accurately express the cyclic behavior of structural steel with less parameters and internal variables. First, we examine the applicability of our program to the analysis of the localization of buckling patterns in thin-walled steel piers. As a result, the program can accurately predict the dynamic as well as the static localization behavior observed in the experiment. Then, we proceed to extensively investigate the dynamic localization of steel piers with circular cross section, by using the computer program. As dynamic loads, sine acceleration waves are applied to the pier base. From this investigation, it is observed that the response displacement and the response strain of the steel piers take their maximum when the period of the sine wave becomes approximately 1.5 times as large as the natural period of the elastic pier. This is probably due to the resonance of the damaged pier whose natural period is increased, compared with the elastic pier. Regarding the localization mode, the steel piers exhibit elephant foot buckling mode when the period of the acceleration wave exceeds the natural period of the steel pier. If the period of the acceleration wave is less than the natural period, a local buckling appears at either side of the pier surface perpendicular to the direction of the input acceleration wave.

为了分析薄壁钢结构屈曲模式的动态局部化，编写了计算机程序。在该程序中，实现了三面循环塑性本构模型。该本构模型能够以较少的参数和内部变量准确地表达结构钢的循环性能。首先，我们检验了我们的程序对薄壁钢桥墩屈曲模式局部化分析的适用性。因此，该程序可以准确地预测实验中观察到的动态和静态定位行为。然后，利用计算机程序对圆形截面钢桥墩的动力局部化进行了广泛的研究。正弦加速度波作为动荷载作用于桥墩基础。研究发现，当正弦波周期约为弹性桥墩自然周期的1.5倍时，钢桥墩的响应位移和响应应变最大。这可能是由于受损墩的共振，其自然周期比弹性墩增加。在局部化模式方面，当加速度波周期超过钢墩的自然周期时，钢墩呈现象脚屈曲模式。当加速度波周期小于自然周期时，垂直于输入加速度波方向的桥墩表面两侧出现局部屈曲。

项目成果

Goto, Zhang, Obata: "Localization of buckling patterns in cylinders under cyclic loading" J.Engrg.Mech, ASCE. 124. 1249-1257 (1998)

Goto、Zhang、Obata：“循环载荷下气缸屈曲模式的定位”J.Engrg.Mech，ASCE。

Goto, Wang, Obata: "Effect of constitutive models on hysteretic behavior of thin-walled bridge piers subjected to seismic loading" Proc.ICCBE'97. 381-386 (1997)

Goto、Wang、Obata：“本构模型对地震荷载作用下薄壁桥墩迟滞行为的影响”Proc.ICCBE97。

後藤、王、高橋、小畑: "繰り返し荷重下の鋼製橋脚の有限要素法による解析と材料構成則" 土木学会論文集. No.591/I-43. 189-206 (1998)

Goto、Wang、Takahashi、Obata：“使用有限元法和材料本构法分析循环荷载下的钢桥墩”，日本土木工程师学会会刊第 591/I-43 号（1998 年）。

Goto, Wang, Takahashi, Obata: "Three surface cycylic plasticity model for FEM analysis of steel bridge piers subjected to seismic loading" Proc.JSCE. I-43. 189-206 (1998)

Goto、Wang、Takahashi、Obata：“地震荷载下钢桥墩有限元分析的三面循环塑性模型”Proc.JSCE。

Goto, Y., Zhang, C.H: "Plastic buckling transition modes in moderately thick cylindrical shells" J.Engrg.Mech, ASCE. Vol.125/No.4 掲載予定. (1999)

Goto，Y.，Zhang，C.H：“中等厚度圆柱壳中的塑性屈曲过渡模式”J.Engrg.Mech，ASCE 第 125 卷/第 4 期即将出版（1999 年）。