New PDF release: A Case for Partial Prestressing

By Bruno Thürlimann (auth.)

ISBN-10: 3034859481

ISBN-13: 9783034859486

ISBN-10: 3764306300

ISBN-13: 9783764306304

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19). In summary it follows that partial prestressing with mixed reinforcement can lead to an improved structural performance and overall cost savings. PARTIAL PRESTRESSING 299 As a simple preliminary design rule the mixed reinforcement can be chosen as follows. The dead load moments should be counterbalanced by the moments due to prestress. For the extreme loading conditions the required strength will be provided by the addition of ordinary reinforcement. A slight modification of such a selection may be necessary depending on the dead to live load ratio and special structural requirements.

17), fewer splices of bars etc. The cost ratio between prestressing and ordinary reinforcement shows a clear tendency to decrease (Fig. 17) such that in many instances the use of prestressing reinforcement is more economical (Fig. 19). In summary it follows that partial prestressing with mixed reinforcement can lead to an improved structural performance and overall cost savings. PARTIAL PRESTRESSING 299 As a simple preliminary design rule the mixed reinforcement can be chosen as follows. The dead load moments should be counterbalanced by the moments due to prestress.

If partial prestressing is used a constant pr~stressing forc~ over the entire length is applied. The extreme moment sections are then covered with additional reinforcing steel. Such solutions lead to greater economy. The'latter is also influenced by the relative costs of ordinary and prestressing steel. Fig. 18 shows the price development in Switzerland over the years 1958 to 1970. The price in Swiss Francs per kilogramm of reinforcing bars, diameter larger than 16 mm, including placing is compared to the price of prestressing cable~ including end anchorages, placing, prestressing and grouting.

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A Case for Partial Prestressing by Bruno Thürlimann (auth.)


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