Seismic responses of a free-standing two-story steel moment frame equipped with a cast iron-mortar sliding base

Yu Lin Chung, Kuan Ting Kuo, Takuya Nagae, Koichi Kajiwara

研究成果: Article同行評審

1 引文 斯高帕斯(Scopus)

摘要

An experimental study was conducted to evaluate the dynamic behavior of a free-standing frame equipped with a movable base system using cast iron and mortar as the bearing materials. The preliminary friction test indicated that a graphite layer developed on the interface and exhibited stable friction behavior. The friction coefficient ranged from 0.33 to 0.36 when the applied normal compression stress ranged from 2.6 to 5.2 MPa. The effect of the variation of normal compression stress would be small. Shaking table tests on the free-standing frame showed that rock, slide, and rock-slide responses occurred. The cumulative slide distance reached 381 mm under JMA Kobe wave excitation; however, only a few cyclic slides occurred at the same locations along the moving track. Most surfaces sustained single slides. Similar results can be observed in other shaking conditions. The insufficient cyclic sliding and significant rocking resulted in a few graphite layers on the mortar surfaces. Friction coefficients were generally similar to those obtained in the preliminary friction tests; however, the values fluctuated when the rocking became significant. The collisions due to rocking caused strong horizontal acceleration responses and resulted in high friction coefficient. In addition, the strong horizontal acceleration responses caused by the collisions made the freestanding specimen unable to reduce the input horizontal acceleration notably, even when slippage occurred. Compared with the counterpart fixed-base specimen, the specimen equipped with the iron-mortar base could reduce the horizontal acceleration amplification response and the structural deformation, whereas the vertical acceleration response was doubled due to collisions from rocking.

原文English
頁(從 - 到)245-256
頁數12
期刊Earthquake and Structures
17
發行號3
DOIs
出版狀態Published - 2019 9月

All Science Journal Classification (ASJC) codes

  • 土木與結構工程

指紋

深入研究「Seismic responses of a free-standing two-story steel moment frame equipped with a cast iron-mortar sliding base」主題。共同形成了獨特的指紋。

引用此