A lateral load distribution for the static analysis of base-isolated building frames under the effect of far-fault and near-fault ground motions

被引:6
作者
Rostami, Afshin [1 ,2 ]
Poursha, Mehdi [1 ,2 ]
机构
[1] Sahand Univ Technol, Fac Civil Engn, Tabriz, Iran
[2] Sahand Univ Technol, Earthquake Engn Res Ctr, Tabriz, Iran
关键词
Scaling of the ground motions; Lateral load distribution; Base-isolated building; Near-fault ground motions; Forward directivity; Fling-Step; DIRECTIVITY; FORCES; SYSTEM;
D O I
10.1016/j.istruc.2021.08.125
中图分类号
TU [建筑科学];
学科分类号
0813 ;
摘要
This paper attempts to examine the effect of the scaling of ground motion records on the seismic responses of base-isolated buildings by using the three scaling methods including the ASCE 7-10, acceleration spectrum intensity, SIa, and the spectral acceleration corresponding to the effective period of the base-isolated structure at the design displacement, S-a(T-D). The buildings had steel moment-resisting and X-braced systems and were isolated with lead rubber bearings (LRBs) at the base. Near-fault ground motions with Forward Directivity (FD), Fling-Step (FS) and No Pulse (No P.) characteristics as well as far-fault ground motion records were studied in this paper. The discrepancy in the seismic responses as well as the effect of the pulse period in the case of pulse-like ground motions was scrutinized for the three scaling methods. Also, the response spectrum analysis (RSA) and static method with the equivalent lateral force distribution prescribed in ASCE 7-10 were carried out. The results indicate that the RSA as well as the static analysis, prescribed in ASCE 7-10, underestimates the story shears of the base-isolated buildings. The underestimation increases in the case of the FF and No P. ground motions having a large amount of spectral acceleration in the higher modes region. Also, the underestimation increases with the increase in the height of the base-isolated buildings as well as in the case of the moment-resisting frames compared to the X-braced ones. Finally, by means of the results derived from the time history analyses, a formula was proposed to determine the lateral force distribution along the height of the base-isolated buildings with LRBs considering the characteristics of the isolator and the structure for different types of the ground motions.
引用
收藏
页码:2384 / 2405
页数:22
相关论文
共 39 条
[1]   Behavior of moment-resisting frame structures subjected to near-fault ground motions [J].
Alavi, B ;
Krawinkler, H .
EARTHQUAKE ENGINEERING & STRUCTURAL DYNAMICS, 2004, 33 (06) :687-706
[2]  
Andriono T, 1991, Bulletin of NZ Society for Earthquake Engineering, V24, P225
[3]  
[Anonymous], 2010, ANSI/AISC 341-10
[4]  
[Anonymous], 2010, 36010 AISC ANSI
[5]  
[Anonymous], 1991, INT C BUILD OFF
[6]  
[Anonymous], 2022, Minimum design loads for buildings and other structures 209, DOI 10.1061/9780784414248
[7]   Influence of Near-Fault Ground Motions with Fling-Step and Forward-Directivity Characteristics on Seismic Response of Base-Isolated Buildings [J].
Bhagat, Satish ;
Wijeyewickrema, Anil C. ;
Subedi, Naresh .
JOURNAL OF EARTHQUAKE ENGINEERING, 2021, 25 (03) :455-474
[8]   Characterization of forward-directivity ground motions in the near-fault region [J].
Bray, JD ;
Rodriguez-Marek, A .
SOIL DYNAMICS AND EARTHQUAKE ENGINEERING, 2004, 24 (11) :815-828
[9]   Lateral force distributions for the linear static analysis of base-isolated buildings [J].
Cardone, Donatello ;
Dolce, Mauro ;
Gesualdi, Giuseppe .
BULLETIN OF EARTHQUAKE ENGINEERING, 2009, 7 (03) :801-834
[10]   A seismic design lateral force distribution based on inelastic state of structures [J].
Chao, Shih-Ho ;
Goel, Subhash C. ;
Lee, Soon-Sik .
EARTHQUAKE SPECTRA, 2007, 23 (03) :547-569