Tartaglia Roberto, D'Aniello Mario, Landolfo Raffaele
Department of Structures for the Engineering and the Architecture, University of Naples Federico II, 80100 Naples, Italy.
Materials (Basel). 2020 Oct 28;13(21):4831. doi: 10.3390/ma13214831.
The seismic response of steel moment resisting frames (MRFs) is influenced by the behavior of joints. Within the ongoing research project "FUTURE"(Full-scale experimental validation of steel moment frame with EU qualified joints and energy efficient claddings under Near fault seismic scenarios), shake table tests will be carried out on a two-story one bay MRF equipped with different types of prequalified beam-to-column joints. In order to design the experimental campaign, preliminary numerical simulations have been carried out to predict the seismic performance of the experimental mock-up in terms of distribution of damage, transient and residual interstory drifts. In this paper the main modeling assumptions and the results of the seismic analyses are shown and discussed. In particular, the response of joints was systematically investigated by refined finite element (FE) simulations and their behavior was taken into account in the global structural performance by means of both concentrated plastic hinge and distributed plasticity models. Both static and dynamic non-linear analyses show in which terms the type of models for plastic hinges influences the results. The modeling approach plays a key role only at very high seismic intensity where large ductility demand is imposed. In addition, changing the type of joints has less influence on the overall response of the frame.
钢框架-弯矩抵抗框架（MRF）的地震响应受节点性能的影响。在正在进行的“FUTURE”研究项目（近断层地震场景下具有欧盟合格节点和节能围护结构的钢框架-弯矩抵抗框架的足尺试验验证）中，将对一个配备不同类型预制梁柱节点的两层单跨MRF进行振动台试验。为了设计试验方案，已进行了初步数值模拟，以根据损伤分布、瞬态和残余层间位移预测试验模型的抗震性能。本文展示并讨论了主要建模假设和地震分析结果。特别是，通过精细有限元（FE）模拟系统地研究了节点的响应，并通过集中塑性铰和分布塑性模型将其行为纳入整体结构性能分析中。静态和动态非线性分析均表明塑性铰模型类型在哪些方面会影响结果。建模方法仅在施加很大延性需求的非常高地震强度下才起关键作用。此外，改变节点类型对框架的整体响应影响较小。
