Effect of Elastomeric Bearings on Seismic Response of Skewed Bridges

2009 ◽  
Author(s):  
S. Maleki
Keyword(s):  
Seismic Response ◽  
Elastomeric Bearings ◽  
Skewed Bridges

Influence of Transient and Partial Footing Separation on the Seismic Response of Skewed Bridges with Soil Support

2021 ◽  
pp. 2150132
Author(s):  
Ziqi Yang ◽  
Chern Kun ◽  
Dongliang Meng ◽  
Nawawi Chouw
Keyword(s):  
Seismic Response ◽  
Large Scale ◽  
Bending Moment ◽  
Bridge Piers ◽  
Seismic Load ◽  
Skew Angle ◽  
Skewed Bridges ◽  
Design Spectrum ◽  
Bridge Structures ◽  
The Impact

Previous research has shown that the transient and partial footing separation is one of the effective methods to reduce the impact of earthquakes on bridge structures. The separation will not only temporarily stop the transfer of seismic load to structures, but also activate rigid-like body motions of the bridge piers. Most of current investigations involving footing uplift only focused on straight bridges. The influence of skew angle is rarely considered. Even though skewed bridges are common and more vulnerable to seismic load. This work reveals the simultaneous influence of skew angle and footing uplift on soil on seismic response of bridges. A bridge with a 30∘ or 45∘ skew angle, in addition to a straight bridge, was excited using a large-scale shake table. The ground excitations were stochastically simulated based on design spectrum of New Zealand standard. The result revealed that with increasing skew angle bridges will have frequent footing uplifts. In the case of a straight bridge, although allowing footing uplift is beneficial in reducing the bending moment at the pier support, it increases the longitudinal girder displacement. In contrast, in the case of 30∘ and 45∘ skewed bridges, uplifts increase the bending moments of piers and the displacements of the girder, especially in the transverse direction.

scholarly journals Experimental Evaluation of the Seismic Response of Skewed Bridges with Emphasis on Poundings between Girder and Abutments

2019 ◽  
Vol 2019 ◽  
pp. 1-15 ◽  
Author(s):  
Ziqi Yang ◽  
Chern Kun ◽  
Nawawi Chouw
Keyword(s):  
Seismic Response ◽  
Experimental Research ◽  
Experimental Evaluation ◽  
Shake Table ◽  
Skew Angle ◽  
Shake Table Tests ◽  
Skewed Bridges ◽  
Single Frame ◽  
Bridge Model ◽  
Skew Angles

Observations from past earthquake events indicate that skewed bridges are seismically vulnerable due to induced horizontal in-plane rotations of the girder. To date, however, very limited experimental research has been done on the pounding behaviour of skewed bridges. In this study, shake table tests were performed on a single-frame bridge model with adjacent abutments subjected to uniform ground excitations. Bridges with different skew angles, i.e., 0°, 30°, and 45°, were considered. The pounding behaviour was observed using a pair of pounding and measuring heads. The results reveal that poundings could indeed influence the responses of skewed bridges in the longitudinal and transverse directions differently and thus affect the development of the girder rotations. Ignoring pounding effects, the 30° skewed bridges could experience more girder rotations than the 45° skewed bridges. With pounding, the bridges with a large skew angle could suffer more opening girder displacements than straight bridges.

Sign in / Sign up

Export Citation Format

Share Document