Abstract
The use of longer and deeper precast concrete girders has created concern regarding their rollover instability, particularly during construction. Current design and construction specifications do not provide any specific guidelines that can be used to evaluate the rollover instability of a girder. Therefore, analytical and simplified numerical studies were performed to evaluate the critical wind load, lateral displacement and rotational angle that would induce rollover instability of a girder supported on an elastomeric bearing pad. The influence of the length and section properties of the girder on rollover instability was also investigated. The analytical method proposed in this study can be effectively used for evaluating the lateral behaviour and rollover instability of bridge girders and can also provide management values for securing the lateral stability of girders. The paper also provides a worked problem for a long-span typical European girder to determine critical values with application of the proposed method.
Highlights
Precast concrete bridge girders have been widely used in bridge design and construction as they provide ease and speed of construction along with excellent structural performance
Based on the determined critical wind loads, lateral displacements and rotational angles, this study examined the effects of the length and section of girders on their lateral instability
4·0 this study evaluated the correlation between the moment of inertia in the strong axis (Ix), the moment of inertia in the
Summary
Precast concrete bridge girders have been widely used in bridge design and construction as they provide ease and speed of construction along with excellent structural performance. For much easier modelling of the elastic support condition and application to changes in girder geometry and boundary conditions, a simplified numerical method, based on a 3D beam element, was used to evaluate the lateral instability behaviour of precast concrete girders supported on elastomeric bearings at the construction stage. The proposed analytical method can be effectively applied to evaluate the lateral behaviour and instability of precast concrete I-girders, and provides construction management values for the critical wind load, displacement and rotational angle. The safety factor (SF) against rollover failure is calculated using the ratio of the resisting moment to the overturning moment
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