الفهرس | Only 14 pages are availabe for public view |
Abstract A service life of 80 to 100 years is generally assumed for a reinforced concrete structure. During that period, it has to meet many different requirements, not all of which may be known during the design phase. Changes in utilization, damages or construction defects may mean that some bearing capacity and /or rigidity parameters have to be increased before a structure is fit for use again. Many different strengthening methods are available, such as adding of unstressed or pre-stressed steel, installation of external prestressed reinforcement, bonded reinforcement, increase of the concrete crosssection, with or without additional reinforcement (concrete sprayed-on, placed conventionally or bonded as a precast member) etc. Consideration must be given to whether the areas to be strengthened are subjected to compressive, tensile or shear stress and whether the necessary measures relate to stability, fitness for use and/or fatigue safety. In addition cost, time, quality and maintenance parameters have to be taken into consideration. It is the engineer’s responsibility to find the ideal method to strengthen the structures needing rehabilitation. The scope of this research is to have an optimum usage of building materials used for strengthening. This is achieved by selecting the right method of strengthening. Where a comparison with the help of software is carried out taking into consideration the different parameters related to cost, time, quality control, constructability, long term durability and maintenance, to select the optimum strengthening method. |