Seismic fragility analysis of multi-storey frame structure considering effect of valley terrain
Bo HUANG1,2(),Kai-long LIAO1,2,Yu ZHAO1,2,*(),Jian-qun JIANG3
1. MOE Key Laboratory of Soft Soils and Geoenvironmental Engineering, Zhejiang University, Hangzhou 310058, China 2. Institute of Geotechnical Engineering, Zhejiang University, Hangzhou 310058, China 3. Institute of Hydraulic Structure and Water Environment, Zhejiang University, Hangzhou 310058, China
The seismic fragility curves of multi-storey frame structures suitable for Hangjiahu area were given based on dynamic time history analysis and probability statistics method combining with the local soil engineering characteristics and the fact of seismic fortification zones in view of the special situation that the scouring and silting valley topography is widely distributed in Hangjiahu area. The dynamic analysis results of multi-storey frame structures without considering foundation, homogeneous foundation and River Valley Foundation were compared. Results show that soil-structures dynamic interaction has a significant influence on the dynamic analysis results of structures. The deformation and the exceeding probability of fragility performance level of buildings were underestimated without considering soil-structures dynamic interaction. The deviation can reach 7.9%, which will lead to a dangerous result. The unique focusing effect of local valley topography on seismic waves will increase the structural deformation. The exceeding probability of seismic vulnerability can increase by 12.1% compared with homogeneous foundation, and the focusing effect is different at different locations of the valley. Under the selected seismic wave input, the closer the building structure is to the center of the valley, the greater the structural deformation and the greater the probability of exceeding the seismic fragility are.
Bo HUANG,Kai-long LIAO,Yu ZHAO,Jian-qun JIANG. Seismic fragility analysis of multi-storey frame structure considering effect of valley terrain. Journal of ZheJiang University (Engineering Science), 2019, 53(4): 692-701.
Fig.3Acceleration time history curve of surface center point
地震名称
年份
Ms
R/km
EL Centro
1979
6.6
2.5
Chichi
1999
7.6
7.3
Taft
1952
7.4
41.0
Kobe
1995
6.9
15.5
Loma Prieta1
1989
6.9
70.4
Loma Prieta2
1989
6.9
28.6
Loma Prieta3
1989
6.9
35.5
Northridge1
1994
6.7
7.1
Northridge2
1994
6.7
6.2
Whittier Narrows
1987
5.3
4.4
Coalinga
1983
6.0
10.0
Kocaeli
1999
7.4
67.5
Mammoth Lake
1980
4.9
7.5
San Fernando
1971
6.6
12.0
Coyote
1979
5.7
12.6
Nahanni
1985
6.8
6.0
Duzce
1999
7.2
8.2
Cape Mendocino
1992
7.1
9.5
Tab.2List of earthquake records
Fig.4Response spectrum of 18 seismic waves
Fig.5Acceleration time history curve of homogeneous foundation model at ground and base
Fig.6Acceleration fourier spectrum of homogeneous foundation model at ground and base
Fig.7Acceleration response spectral ratio of homogeneous foundation and valley foundation model at bottom of column
Fig.8Structural deformation curve
Fig.9Seismic fragility curves considering local valley terrain
Fig.10Exceedance probability increase of local valley terrain
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