Time filter

Source Type

Madrid, Spain

Tanner P.,IETCC CSIC | Bellod J.L.,Cesma Ingenieros | Hingorani R.,IETCC CSIC | Sanz D.,Cesma Ingenieros
Engineering for Progress, Nature and People

Bridge building is a highly uncertain endeavour that entails considerable risk, as attested to by the succession of construction-related incidents and accidents recently reported in Spain and elsewhere. While efforts are being made to improve on-site safety, many issues are still outstanding, such as the establishment of reliability requirements for the ancillary systems used. The problems that must be dealt with in everyday practice, however, are more elementary and often attributable to human error. The overall organisation of the use of bridge construction equipment is in need of improvement. Close cooperation between the bridge engineers responsible for construction planning and ancillary element suppliers is imperative, for flawed interaction between building equipment and the bridge under construction may generate structural vulnerability. External quality assurance should likewise be mandatory. Source

Tanner P.,Cesma Ingenieros | Bellod J.L.,Cesma Ingenieros
Engineering for Progress, Nature and People

The courthouse at El Ejido has a trapezoid floor plan (47 m x 55/26 m) and comprises two distinct volumes that are structurally connected at basement level and by footbridges on the upper storeys. A third trapezoid unit featuring a glazed curtain wall façade cantilevers 8 m off the main façade of the front volume. This façade is a structural diaphragm wall, constituted by nine rows of vertical precast concrete members separated by horizontal cast-in-place, self-compacting concrete chords. The location of the courthouse in a seismic area and the short number of horizontal supports for the façade make this wall potentially vulnerable. The particularly high risk during construction called for careful planning based on a detailed analysis of the interaction between the structure and the ancillary resources used to build it. Source

Tanner P.,Cesma Ingenieros | Tanner P.,CSIC - Eduardo Torroja Institute for Construction Science | Bellod J.L.,Cesma Ingenieros | Sanz D.,Cesma Ingenieros | Hingorani R.,CSIC - Eduardo Torroja Institute for Construction Science
Civil Engineering and Environmental Systems

Like other competitive bridge erection techniques, incremental launching is a highly vulnerable process that entails considerable risks to persons. In steel and composite bridges, in particular, patch loading and other mechanisms that induce instability must be avoided. Considerable uncertainties are associated with both resistances and support reactions during launch operations due to the broad range of factors involved. Nonlinear finite element (FE) analysis is very useful for the explicit verification of both local and overall system stability during steel structure launching. Monitoring, in turn, may be a very powerful tool for reducing the risks associated with such operations. Further research is needed both to establish safety levels for temporary structures and on-site activities and to develop a suitable design format for nonlinear FE analysis. However, in everyday practice, engineers and builders must deal with much more basic problems, often related to the interaction between the structure under construction and the ancillary resources used, as exemplified in the case study described in this contribution. The lessons learnt from such incidents are extremely useful for improving the strategies presently in place to reduce construction-related risks. © 2013 Copyright Taylor and Francis Group, LLC. Source

Tanner P.,Cesma Ingenieros | Bellod J.L.,Cesma Ingenieros | Sanz D.,Cesma Ingenieros
Proceedings of SDSS' Rio 2010: International Colloquium Stability and Ductility of Steel Structures

The viaduct over the River Llobregat at Puig Reig, Spain, illustrates how demanding conditioning factors can serve as inspiration for a satisfactory solution. The functional design adopted, characterized by the simplicity of its lines, was enhanced by the careful shaping of structural members and good detailing. This example shows that modern, technologically advanced bridge design can be compatible with a solution whose elegance meets even the most exacting aesthetic standards, with no need for inefficient members or adornments, at an affordable additional cost over the least expensive solution. The ideas underlying the conceptual design for the River Llobregat bridge, in particular with respect to the specific boundary conditions involved, are explained in the article, along with the actual layout, remarks about the design of structural details and the verification of structural safety during the incremental launching of the steel structure. © (2010) by COPPE - Federal University of Rio de Janeiro All rights reserved. Source

Discover hidden collaborations