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

本研究得到的结果如下：1)利用USSP分析程序进行弹塑性和有限位移分析，收集箱形截面加劲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是评价屈曲模态的有效指标。2)开发了一个动态响应分析代码，命名为USSP-D，可以只使用计算机进行伪动态测试。与伪动态测试结果相比，验证了所开发的代码具有足够的精度。此外，开发了一套分析规范USSP-D，适用于多种不同截面的钢墩柱和钢刚架墩。分析结果表明，所编制的程序可以有效地考虑柱构件的局部屈曲和耦合屈曲。3)采用新型试验设备，对包含基础和多个锚杆的桥墩基础进行了模型单调加载和循环加载试验。指出基础弯曲破坏对柱基基础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。使用该应用软件，即使是大型模型，也可以在计算机上以较高的速度实现响应时程。5)为了更准确地模拟刚架桥墩柱的受力特性，在考虑桥墩转动特性的基础上，建立了新的单元。6)开发的钢框架墩柱分析系统手册出版。

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.