Affiliation:
1. Equi Bridges AG, Chur, Switzerland
Abstract
<p>Two equivalent motorway flyover ramps built in 1963, curved in view and with skewed abutments must be rehabilitated. The superstructures need to be strengthened due to deficiencies in shear capacity.</p><p>The post-tensioned concrete box section girder is supported by four bearings, all of which are of a different type. One of the bearings serves as a tension bearing, in form of a vertical, not inspectable post-tensioned cable. A monolithic connection of the superstructure with the abutment has been elaborated to provide a low maintenance alternative force path for the case of a potential loss of the tension in the vertical tendon. In addition, the proposed connection provides for the required seismic resistance.</p><p>The strengthening for shear force is executed by doubling the outer post-tensioned web.</p>
Publisher
International Association for Bridge and Structural Engineering (IABSE)
Reference3 articles.
1. Menn, Christian (1990), "Prestressed Concrete Bridges", pp. 536
2. Swiss Society of Engineers and Architects, SIA 261, Actions on Structures, 2020
3. Swiss Society of Engineers and Architects, SIA 269, Existing structures – Bases for examination and interventions, 2011