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Development of a FEM Code analyzing Elasto-Plastic and Dynamic Response Behavior of Steel Rigid Framed Pier considering Local Buckling and Non-linear Behavior of Footing and Anchor Bolts

开发一种有限元代码，用于分析钢刚性框架墩的弹塑性和动态响应行为，考虑基础和锚栓的局部屈曲和非线性行为

基本信息

批准号：
11650491
负责人：
KITADA Toshiyuki
金额：
$ 2.3万
依托单位：
Osaka City University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
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

项目摘要

Obtained results from this study are as follows ;1) Elasto-Plastic and finite displacement analysis is carried out by analytical code USSP, in order to collect the basic date of local buckling and coupled buckling of stiffened thin walled column with a box section. Coupled buckling phenomenon is investigated and it is confirmed bending strain and plate bending strain are very effective as indexes of evaluation of buckling mode.2) Developed is a dynamic response analytical code named as USSP-D that can perform pseudo-dynamic testing by using only computers. And it is confirmed that the results from the developed code has an enough precision compared with those of pseudo dynamic testing. Moreover, a developed analytical code USSP-D is applied to many kinds of steel pier columns with various cross sections and a steel rigid framed pier. From the analytical results, it is found that the developed program is very effective to consider local buckling and coupled buckling of column members.3) The monotonous loading and cyclic loading test of the models for the base of the pier included a footing and many anchor bolts were carried out by using the newly experiment facilities. And it is made clear that bending failure of footing has less influences on rotational characteristic of column base footing.4) The application software for visualizing the analytical results is developed to understand huge output results of seismic response analysis of steel rigid framed pier with ease. By using this application software, the time history of response can realize on the computer comparatively at high speed, even though the large-scaled model.5) In order to simulate the behavior of the rigid framed pier columns more preciously, the new element are developed under consideration of the rotational behavior of the piers.6) The manual of the developed analytical system for steel framed pier columns is published.

主要研究成果如下：1）采用有限元分析软件USSP对箱形截面加筋薄壁柱进行弹塑性和有限位移分析，获得了箱形截面加筋薄壁柱局部屈曲和耦合屈曲的基本数据。研究了耦合屈曲现象，证实了弯曲应变和板弯曲应变作为屈曲模态的评价指标是非常有效的。2）开发了一个仅用计算机就能进行拟动力试验的动力响应分析程序USSP-D。通过与拟动力试验结果的比较，验证了所开发程序的精度。并将编制的分析程序USSP-D应用于多种不同截面的钢墩柱和一个钢刚架墩。结果表明，所开发的程序能够有效地考虑柱杆的局部屈曲和耦联屈曲。3）利用新研制的试验装置，对含基础和多根锚栓的桥墩基础模型进行了单调加载和循环加载试验。同时也表明，基础弯曲破坏对柱脚转动特性的影响较小。4）开发了分析结果可视化应用软件，方便理解钢刚架桥墩地震反应分析的海量输出结果。通过该应用软件，即使在大比例尺模型下，也能在计算机上以较快的速度实现反应时程的计算。5）为了更精确地模拟刚架墩柱的受力性能，考虑墩柱的转动性能，开发了新的单元。