Sensitivity Analysis of Response of a Cable Bridge with Base Isolation to Material Variation under Near Earthquake

Document Type : Research Article


1 Civil Engineering, Babol Noshirvani University of Technology

2 Babol Noshirvani University of Technology


Several factors can influence the response of structures under seismic loading. The specifications of the materials used may differ from the parameters required in the design of structures. This difference can affect the response of structures. In this study, we have tried to investigate the sensitivity analysis of the effects of changing the properties of materials on the seismic response of a suspended cable bridge equipped with RNC isolator. A cable bridge with and without the RNC isolation has been dynamically analyzed after initial modeling under a Sanfernado earthquake record. Then, the effect of random variables on the response of these structures is investigated using Monte Carlo and first order second moment sensitivity methods. Finally, the accuracy of FOSM analysis compared to Monte Carlo method. Two parameters of base shear and maximum deck displacement are considered as structural responses. The results show that among the material characteristics, final strength properties of concrete, reinforcement yield stress and modulus of elasticity of cables have the most influence on the seismic response of these structures. Also, the sensitivity of these parameters in the isolated bridge is lower than that of the non-separated bridge.


Main Subjects

[1] H.-E.M. Ali, A.M. Abdel-Ghaffar, Seismic passive control of cable-stayed bridges, Shock and Vibration, 2(4) (1995) 259-272.
[2] K.-S. Park, H.-J. Jung, I.-W. Lee, Hybrid control strategy for seismic protection of a benchmark cable-stayed bridge, Engineering Structures, 25(4) (2003) 405-417.
[3] H.E.M. Ali, A.M. Abdel‐Ghaffar, Seismic energy dissipation for cable‐stayed bridges using passive devices, Earthquake engineering & structural dynamics, 23(8) (1994) 877-893.
[4] M. Ismail, J. Rodellar, F. Ikhouane, Seismic protection of low‐to moderate‐mass buildings using RNC isolator, Structural Control and Health Monitoring, 19(1) (2012) 22-42.
[5] N. MAKRIS, Rigidity–plasticity–viscosity: Can electrorheological dampers protect base‐isolated structures from near‐source ground motions?, Earthquake engineering & structural dynamics, 26(5) (1997) 571-591.
[6] P.K. Malhotra, Response of buildings to near‐field pulse‐like ground motions, Earthquake Engineering & Structural Dynamics, 28(11) (1999) 1309-1326.
[7] J.M. Kelly, Aseismic base isolation: review and bibliography, Soil Dynamics and earthquake engineering, 5(4) (1986) .612-202
[8] Z. Kala, Global sensitivity analysis of reliability of structural bridge system, Engineering Structures, 194 (2019) 36-45.
[9] Y. Xie, R. DesRoches, Sensitivity of seismic demands and fragility estimates of a typical California highway bridge to uncertainties in its soil-structure interaction modeling, Engineering Structures, 189 (2019) 605-617.
[10] S. Mangalathu, J.S. Jeon, R. DesRoches, Critical uncertainty parameters influencing seismic performance of bridges using Lasso regression, Earthquake Engineering & Structural Dynamics, 47(3) (2018) 784-801.
[11] B.G. Nielson, R. DesRoches, Influence of modeling assumptions on the seismic response of multi-span simply supported steel girder bridges in moderate seismic zones, Engineering structures, 28(8) (2006) 1083-1092.
[12] E. Sapountzakis, P. Syrimi, I. Pantazis, I. Antoniadis, KDamper concept in seismic isolation of bridges with flexible piers, Engineering Structures, 153 (2017) 525-539.
[13] J.X. Mao, H. Wang, D.M. Feng, T.Y. Tao, W.Z. Zheng, Investigation of dynamic properties of long‐span cablestayed bridges based on one‐year monitoring data under normal operating condition, Structural Control and Health Monitoring, 25(5) (2018) e2146.
[14] P. Ni, Y. Xia, J. Li, H. Hao, Using polynomial chaos expansion for uncertainty and sensitivity analysis of bridge structures, Mechanical Systems and Signal Processing, 119 (2019) 293-311.
[15] R. Jangid, J. Kelly, Base isolation for near‐fault motions, Earthquake engineering & structural dynamics, 30(5) (2001) 691-707.
[16] M.J. Wesolowsky, J.C. Wilson, Seismic isolation of cable‐stayed bridges for near‐field ground motions, Earthquake engineering & structural dynamics, 32(13) (2003) 21072126.
[17] M. Ismail, J. Rodellar, F. Ikhouane, A seismic isolation system for supported objects. Spanish Patent No. P200802043, Spanish Office of Patents and Marks,  (2008).
[18] M. Ismail, J.R. Casas, J. Rodellar, Near-fault isolation of cable-stayed bridges using RNC isolator, Engineering Structures, 56 (2013) 327-342.
[19] Z. Kala, J. Valeš, Imperfection sensitivity analysis of steel columns at ultimate limit state, Archives of Civil and Mechanical Engineering, 18(4) (2018) 1207-1218.
[20] J. Kim, J.-H. Park, T.-H. Lee, Sensitivity analysis of steel buildings subjected to column loss, Engineering Structures, 33(2) (2011) 421-432.
[21] T.H. Lee, K.M. Mosalam, Seismic demand sensitivity of reinforced concrete shear‐wall building using FOSM method, Earthquake engineering & structural dynamics, 34(14) (2005) 1719-1736.