Silke Scheerer

Strengthening of existing concrete structures: Design models

Abstract Lack of resources and an increased rate in city growth, both in residential and industrial areas, have resulted in a need to develop conceptual plans to strengthen the majority of existing buildings in the near future. The new load demands that need to be imposed on such buildings may exceed the loadbearing capacity of their structural elements. One solution is the subsequent strengthening with textile-reinforced concrete (TRC). In Part III, a comprehensive overview of this innovative construction material is given. This chapter presents the newly developed analysis and design models for beams, slabs and columns to be strengthened with TRC. The basis of the design criteria was developed in a number of subprojects of the Collaborative Research Center SFB 528 (1999–2011). The main goal is to increase the loadbearing capacity under bending, shear, torsional and axial forces by the application of TRC. The design and analysis models have been validated by numerous specimen tests, developed over the years and implemented in various pilot projects.

Strengthening and Repair with Carbon Concrete Composites – the First General Building Approval in Germany

Fabrics made of high performance, non-corrosive endless fibers, embedded in a cementitious matrix, can be advantageous over common steel reinforced members. The performance of textile reinforced concrete (TRC) resp. carbon concrete composites was demonstrated by several built examples. An obstacle to a broad application of this building material is the lack of regulations and codes. With a first general building approval, the building with TRC should be made easier. The approval is valid for bending strengthening inside buildings. This article introduces the basic research on strengthening of slabs, describes the scientific investigations that were necessary to obtain the approval, as well as the application conditions.

Herstellung und Ausführungsmethoden

Lehrgeruste dienen wie Schalungen der Herstellung und Formgebung von Brucken. Bis der Beton erhartet und ausreichend tragfahig ist, nehmen sie die Lasten aus der Schalung auf und leiten diese uber Rusttrager, -stutzen und Fundamente in den tragfahigen Baugrund ab. Lehrgeruste sind Ingenieurbauwerke und sind wie diese zu berechnen und zu konstruieren.