Local buckling behaviour of high-strength steel tubular columns subjected to one-sided cyclic loading and implications in seismic design of steel MRFs
Local buckling behaviour of high-strength steel tubular columns subjected to one-sided cyclic loading and implications in seismic design of steel MRFs
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单侧循环荷载作用下高强钢管柱的局部屈曲行为及其对钢 MRF 抗震设计的影响
DOI：
10.1016/j.soildyn.2021.107115
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发表时间：
2022
影响因子：
4
通讯作者：
M. Theofanous
中科院分区：
文献类型：
--
作者：
Shingo Hamauzu;Konstantinos A. Skalomenos;M. Kurata;M. Theofanous
屈服后，钢结构逐渐表现出一个不对称的滞回性能在地震偏置在一个方向（棘轮效应）。由于没有对称的循环荷载反向，这种响应可能对结构部件有利。为了评估非对称循环荷载下构件的非弹性行为，本研究在对钢抗弯框架（MRF）的非对称滞回性能进行参数研究的基础上，开发了一套柱的单侧循环荷载历史。试验和计算结果表明，钢管柱在单向循环荷载作用下的延性比对称循环荷载作用下的延性高15%~ 71%，表现出足够的抗局部屈曲能力和足够的延性。这些降低的延展性要求可以允许在能量耗散区中使用高强度钢，例如高屈服-抗拉强度比（Y/T）钢，导致降低的材料消耗和更经济的建筑物抗震设计。上述研究结果被用于采用高Y/T钢的MRF的抗震设计中，其具有与相应的常规钢MRF几乎相同的横向强度，但柱的横截面积小近25%。非线性时程分析表明，高Y/T MRF表现出弹性频繁事件下，而底层柱的常规MRF产生。在罕遇地震作用下，高Y/T MRF的平均层间位移延性需求仅为1.77，而常规MRF的平均层间位移延性需求为2.57。前MRF成功地抵抗了地震荷载，没有经历局部屈曲柱。
After yielding, steel structures progressively exhibit an asymmetrical hysteretic behaviour under earthquakes biased in one direction (ratcheting effect). This response may be favourable to structural components because of the absence of symmetrical cyclic loading reversals. To evaluate the inelastic behaviour of components to asymmetrical cyclic loading, this study develops a set of one-sided cyclic loading histories for columns on the basis of a parametric study on the asymmetrical hysteretic behaviour of steel moment-resisting-frames (MRFs). Experimental and computational results indicate that steel tubular columns subjected to one-sided cyclic loading may exhibit 15%–71% higher ductility compared with that under symmetrical cyclic loading showing adequate resistance to local buckling initiation and sufficient ductility afterwards. These reduced ductility demands may permit the use of high-strength steels in energy dissipative zones, such as high yield-to-tensile strength ratio (Y/T) steels, resulting in reduced material consumption and more economical seismic design of buildings. The above findings are utilized in the seismic design of a MRF employing high Y/T steel, which enjoys almost the same lateral strength as a corresponding conventional steel MRF but nearly 25% smaller cross-sectional area in columns. Nonlinear time-history analyses revealed that the high Y/T MRF behaved elastically under frequent events, whilst the ground floor columns of the conventional MRF yielded. Under rare seismic events, the average story drift ductility demand for the high Y/T MRF was only 1.77, while for the conventional MRF was 2.57. The former MRF successfully resisted the earthquake loads without experiencing local buckling in columns.
影响因子：
5.5
作者：
A. Moustafa;I. Takewaki
通讯作者：
A. Moustafa;I. Takewaki