Influence of seismic design rules on the robustness of steel moment resisting frames
Influence of seismic design rules on the robustness of steel moment resisting frames
复制标题
DOI：
10.12989/scs.2016.21.3.479
复制
发表时间：
2016-06
影响因子：
4.6
通讯作者：
L. Silva;D. Cassiano;M. D’Aniello;C. Rebelo;R. Landolfo
中科院分区：
文献类型：
--
作者：
L. Silva;D. Cassiano;M. D’Aniello;C. Rebelo;R. Landolfo
抗震设计标准允许提高结构的延性和控制损伤分布。因此，现行抗震规范的构造规则和设计要求也可能有利于提高结构的鲁棒性。在本文中，一个全面的参数研究，致力于量化的有效性，钢抗弯框架（MRF）在限制连续倒塌柱损失的情况下，抗震详图。通过非线性静力和动力分析，分析了结构的整体性能。在这方面，对以下情况进行了研究：（i）根据欧洲规范1设计的风作用MRF结构;（ii）根据欧洲规范8设计的地震作用MRF结构。调查的参数是（i）层数;（ii）层间高度;（iii）跨度长度;（iv）建筑平面布局;以及（v）柱损失情况。结果表明，根据能力设计原则设计的结构比风设计的结构更不稳健，前提是连接在两种情况下具有相同的能力阈值。此外，数值结果表明，柱上方单元数和梁的刚度是控制连续倒塌的关键参数。
Seismic design criteria allow enhancing the structural ductility and controlling the damage distribution. Therefore, detailing rules and design requirements given by current seismic codes might be also beneficial to improve the structural robustness. In this paper a comprehensive parametric study devoted to quantifying the effectiveness of seismic detailing for steel Moment Resisting Frames (MRF) in limiting the progressive collapse under column loss scenarios is presented and discussed. The overall structural performance was analysed through nonlinear static and dynamic analyses. With this regard the following cases were examined: (i) MRF structures designed for wind actions according to Eurocode 1; (ii) MRF structures designed for seismic actions according to Eurocode 8. The investigated parameters were (i) the number of storeys; (ii) the interstorey height; (iii) the span length; (iv) the building plan layout; and (v) the column loss scenario. Results show that structures designed according to capacity design principles are less robust than wind designed ones, provided that the connections have the same capacity threshold in both cases. In addition, the numerical outcomes show that both the number of elements above the removed column and stiffness of beams are the key parameters in arresting progressive collapse.