TY - JOUR
T1 - Effects of soil-structure interaction on longitudinal seismic response of MSSS bridges
AU - Saadeghvaziri, M. A.
AU - Yazdani-Motlagh, A. R.
AU - Rashidi, S.
N1 - Funding Information:
This research study is supported by the New Jersey Department of Transportation/FHWA and the National Center for Transportation and Industrial Productivity at NJIT. The results and conclusions are those of the authors and do not necessarily reflect the views of the sponsors.
PY - 2000
Y1 - 2000
N2 - This paper presents the results of a comprehensive study on the effect of soil-structure interaction on longitudinal seismic response of existing bridges. FHWA's guidelines for footing foundation on semi-infinite elastic half-space are used to determine translational and rotational stiffnesses at the base of bridge abutments and piers. Similarly, stiffness and strength of abutment backfill soil are determined based on FHWA's procedures. Various stiffnesses at the abutments are then lumped (condensed) into one translational spring at the point of impact between the abutment and the deck. Translational springs at the abutments are bilinear with their yield strength in compression determined based on Mononobe-Okabe method. In tension it is equal to the friction force at the footing. Among the parameters considered is the case of damaged back wall, where it is assumed that due to shear failure at the juncture of the back wall and breast wall the abutment strength and stiffness, as well as mobilized abutment mass, have changed. Results indicate that soil-structure interaction (SSI) has a significant effect on the seismic response in the longitudinal direction. Abutment strength is the most critical parameter. Impact force, deck sliding, and SSI affects all plastic rotations at the base of columns. Thus, it is important that analytical models used in seismic evaluation of bridge systems explicitly consider SSI.
AB - This paper presents the results of a comprehensive study on the effect of soil-structure interaction on longitudinal seismic response of existing bridges. FHWA's guidelines for footing foundation on semi-infinite elastic half-space are used to determine translational and rotational stiffnesses at the base of bridge abutments and piers. Similarly, stiffness and strength of abutment backfill soil are determined based on FHWA's procedures. Various stiffnesses at the abutments are then lumped (condensed) into one translational spring at the point of impact between the abutment and the deck. Translational springs at the abutments are bilinear with their yield strength in compression determined based on Mononobe-Okabe method. In tension it is equal to the friction force at the footing. Among the parameters considered is the case of damaged back wall, where it is assumed that due to shear failure at the juncture of the back wall and breast wall the abutment strength and stiffness, as well as mobilized abutment mass, have changed. Results indicate that soil-structure interaction (SSI) has a significant effect on the seismic response in the longitudinal direction. Abutment strength is the most critical parameter. Impact force, deck sliding, and SSI affects all plastic rotations at the base of columns. Thus, it is important that analytical models used in seismic evaluation of bridge systems explicitly consider SSI.
KW - Abutment
KW - Impact
KW - Longitudinal direction
KW - Multi-span simply supported bridges
KW - Seismic response of bridges
KW - Soil-structure interaction
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U2 - 10.1016/S0267-7261(00)00056-7
DO - 10.1016/S0267-7261(00)00056-7
M3 - Article
AN - SCOPUS:0034351288
SN - 0267-7261
VL - 20
SP - 231
EP - 242
JO - Soil Dynamics and Earthquake Engineering
JF - Soil Dynamics and Earthquake Engineering
IS - 1-4
ER -