Strengthening of concrete structures

Author: Amr Abdelrahman

Strengthening of concrete structures presents unified design approach for strengthening concrete members with different techniques such as concrete, steel, and FRP jacketing.

Preference between the various techniques is explained in light of strengthening limits, procedures, and application for each case.

Examples for evaluation of existing structures and design equations for strengthening concrete elements are presented based on the ACI design codes and standards.

Numerical examples are also given for different strengthening techniques with illustrations for the construction methodology and detailing for each case.

Several case studies are explained starting from problem diagnosis, structure analysis, proposal for different strengthening methodologies, and implementation procedure for the selected scheme.

The case studies include structures subjected to gravity loads, lateral loads, elevated temperature, and differential settlement of the foundations.

Strengthening of concrete structures addresses design and construction errors, environmental impact, and soil movement. The case studies include conventional reinforced concrete, post-tensioned, and precast concrete members.

Structures are built to serve a certain function efficiently without deviation on the designed performance throughout its lifetime.

While the structure is at service, it should perform well structurally, aesthetically and environmentally.

It should fulfill all the requirements imposed by the design codes, standards and regulatory authorities.

At any observed deviation of the structure performance, measures should be taken to protect, mitigate or improve the current condition.

The decision shall be based on technical assessment given by expert engineers addressing the need for immediate action, methodology of remedial action in addition to the cost.

The action should consider the sequences of interruption of the structure use during implementation since it is a major element in the decision.