Contreras Railway Viaduct 261 m longest Arch Railway bridge of Spain

Contreras Railway Viaduct is one of the main structures on the Madrid – Valencia high-speed railway link. Upon completion, the structure became Spain’s largest concrete arch for a rail bridge. Villargordo del Cabriel stretch represents an example of the use of the state-of-the-art construction systems, instigated by the limitations resulting from a layout that allows … Read more

CDA has invited Technical Proposals for Signal Free Controlled Access Corridor on Islamabad Highway

CDA has invited proposals from the consulting firms of Pakistan for the design of project  “Signal Free and Controlled Access Corridor for Islamabad highway”. In an advertisement CDA, has mentioned that it needs the consultancy services of experienced consulting firms / engineering organizations having Project code 1215 (II) registration with PEC and must to have … Read more

What are the functions of different components of a typical expansion joint?

We all know that concrete is vulnerable to temperature changes it usually shrinks and expands due to some temperature variations, in such a condition most of the times a crack is intentionally introduced so that any expansion or shrinkage in a panel would not produce uncontrolled cracks as a result of stress production within the … Read more

What are Articulating concrete blocks? Uses and Functions

Sediment transport in streams and rivers is inevitable as the stream or river transport capacity rises and falls with the streamflow. If the transport capacity in a location exceeds the sediment supply, erosion will occur. Streambank erosion must be controlled in critical areas (e.g. near bridge crossings) for safety as well as economic reasons.  The … Read more

What is the difference between working stress approach and limit state approach?

For working stress approach, service loads are used in the whole design and the strength of material is not utilized in the full extent. In this method of design, stresses acting on structural members are calculated based on elastic method and they are designed not to exceed certain allowable values. In fact, the whole structure … Read more