Stathas Nikolaos, Di Sarno Luigi, Wu Jingren, Freddi Fabio, D'Aniello Mario, Bousias Stathis, Landolfo Raffaele, Güneyisi Esra Mete, Papagiannis Lambros
Civil Engineering, University of Patras, Patras, Peloponnisos Dytiki Ellada ke Ionio, 26504, Greece.
Civil and Environmental Engineering, University of Liverpool, Liverpool, England, L69 7ZX, UK.
Open Res Eur. 2024 Nov 27;4:161. doi: 10.12688/openreseurope.17563.2. eCollection 2024.
Existing steel frames not complying with modern seismic codes are often vulnerable to earthquakes due to inadequate seismic detailing. These types of framed structures typically feature semi-rigid and partial strength column-base connections; the behaviour of such connections may significantly affect their seismic performance. However, current code provisions offer limited guidance for the assessment and retrofit of column-base connections To fill the knowledge gap, the H2020 EU-funded Earthquake Assessment of Base-Column Connections in Existing Steel Frames project experimentally investigated, the response of exposed column-base plate connections. Bi-directional Pseudo-Dynamic tests were carried out at the Structures Laboratory of the University of Patras within the framework of "Engineering Research Infrastructures for European Synergies - ERIES" project. The case-study steel frame featured two types of column-base plate connections, stiffened and unstiffened, representing respectively the base connections of an external moment-resisting frame and an internal gravity frame. The experimental programme comprised free vibration tests to identify the modal properties of the sample steel frame. A set of quasi-static cyclic tests and pseudo-dynamic tests were then carried out to investigate the performance of the steel frame under bi-directional earthquake sequences. The response of each component constituting the column-base plate connections was monitored during the tests to fully capture the behaviour of the connections. Such experimental results allow model calibration and further parametric investigation on column base plate connections.
现有不符合现代抗震规范的钢框架，由于抗震细节不足，往往易受地震影响。这类框架结构通常具有半刚性和部分强度的柱脚连接；此类连接的性能可能会显著影响其抗震性能。然而，现行规范条款对柱脚连接的评估和加固提供的指导有限。为填补这一知识空白，由欧盟“地平线2020”计划资助的“现有钢框架柱脚连接地震评估”项目，对外露柱脚底板连接的响应进行了试验研究。双向拟动力试验在帕特雷大学结构实验室，于“欧洲协同工程研究基础设施——ERI ES”项目框架内开展。该案例研究钢框架有两种类型的柱脚底板连接，即加劲和未加劲的，分别代表一个外部抗弯框架和一个内部重力框架的柱脚连接。试验计划包括自由振动试验，以确定样本钢框架的模态特性。随后进行了一组拟静力循环试验和拟动力试验，以研究钢框架在双向地震序列作用下的性能。试验过程中监测了构成柱脚底板连接的每个部件的响应，以全面掌握连接的性能。这些试验结果有助于对柱脚底板连接进行模型校准和进一步的参数研究。
