Premium
Seismic responses of bridges with rocking column‐foundation: A dimensionless regression analysis
Author(s) -
Zhang Jian,
Xie Yazhou,
Wu Gang
Publication year - 2019
Publication title -
earthquake engineering and structural dynamics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.218
H-Index - 127
eISSN - 1096-9845
pISSN - 0098-8847
DOI - 10.1002/eqe.3129
Subject(s) - dimensionless quantity , foundation (evidence) , structural engineering , column (typography) , seismic analysis , engineering , ground motion , nonlinear system , bridge (graph theory) , geotechnical engineering , mechanics , physics , medicine , archaeology , connection (principal bundle) , quantum mechanics , history
Summary Rocking column‐foundation system is a new design concept for bridges that can reduce overall seismic damage, minimize construction and repair time, and achieve lower cost in general. However, such system involves complex dynamic responses due to impacts and highly nonlinear rocking behavior. This study presents a dimensionless regression analysis to estimate the rocking and shaking responses of the flexible column‐foundation system under near‐fault ground motions. First, the transient drift and rocking responses of the system are solved numerically using previously established analytical models. Subsequently, the peak column drifts and uplift angles are derived as functions of ground motion characteristics and the geometric and dynamic parameters of column‐foundation system in regressed dimensionless forms. The proposed response models are further examined by validating against the numerical simulations for several as‐built bridge cases. It is shown that the proposed model not only physically quantifies the influences of prominent parameters, but also consistently reflects the complex dynamics of the system. The seismic demands of rocking column‐foundation system can be realistically predicted directly from structural and ground motion characteristics. This can significantly benefit the design of bridges incorporating this new design concept.