A new approach to assessment of load carrying capacity of damage concrete bridge piers on near-fault earthquakes

Document Type : Original Research

Authors
F. Daneshjoo 1
M. ansari 2
1 Professor of Civil Eng., Faculty of Civil and Environmental Engineering, Tarbiat Modares University, Tehran, Iran
2 Assistant Professor of Civil Eng., Faculty of Engineering, Bozorghmehr University of Qaenat, Qaen, Iran
10.22034/25.1.59
Abstract
Modern reinforced concrete bridge structures affected by a near-fault strong ground motion usually exhibit a large lateral residual deformation and end up standing in an ‘out of plump’ position. Even though these bridges have not collapsed, they are mostly not any more functional in the immediate aftermath of the ground shaking and generally deemed irreparable. These relatively large residual displacements observed in damaged bridges by near-fault strong ground motions jeopardize the operability of the bridge after the seismic event partly due to the introduction of the additional moments in the columns induced by the offset of vertical gravity loads. Therefore, it is of great significance to be able to accurately predict the demand and capacity of residual drifts for bridges exposed to near-field ground motions for decision-making about their serviceability upon a major seismic event. In this research, on the contrary to the design code requirements and the previous studies, an analytical model is proposed which can account for the bridge pier properties and the ground motion characteristics. The proposed model takes the variation in the stiffness and strength of the bridge pier which is proportional to the incurred damages in different earthquake shaking levels into account in order for the prediction of permanent drift capacity.

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Modares Civil Engineering journal
Volume 25, Issue 1 - Serial Number 81
March and April 2025
Pages 59-70