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- W2330268532 abstract "R ecently, two distinct types of precast prestressed segmental bridge design have been developed in Czechoslovakia. These designs are suitable for both urban and highway bridges with spans 'ranging up to 150 ft (45 m). The first design (Fig. 1) consists of box segments transversely connected by the top flange while the second alternative (Fig. 2) utilizes segments of open, double-tee cross sections. The development of these bridges was preceded by the successful construction of several segmental overpasses (Fig. 3). Although these bridges were built under different social and economic conditions, some of their structural features and construction methods have interest and applicability to projects in other parts of the world. The following features are common to all the bridge structures described herein: 1. The superstructure consists of precast match-cast segments with a specified cube strength of about 7000 psi (50 MPa). Shortline horizontal casting was used to produce all constant-depth segments while adjustable forms allowed for both horizontal and vertical curves and variations in superelevation. The segments of the box cross si tions were cast in forms similar to the developed by Campenon and Bernard. 2 T double-tee members were cast in forms i ing a new concept. The segments are c. in one-day production cycles and the curi of the concrete was accelerated by steami the freshly cast components. 2. To control temperature and humid variations, deicing salts, and different ere and shrinkage ratios of the segment sly and webs, the joints between segments we covered with epoxy resin during assemb Also, the faces of the segments were pi vided with multiple keys and erected cantilever. This made it easier for the pi cast segments to adjust to their proper 1 sition after temporary post-tensioning. 3. The erection process was designed such a way that the structural configurati of the bridge would not be affected by t redistribution of creep caused by volume stress changes. 4. During the course of erection, the perstructure was gradually post-tension by two systems of tendons: straight tend( placed in the deck and draped tendons plac" @default.
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- W2330268532 date "1986-01-01" @default.
- W2330268532 modified "2023-09-26" @default.
- W2330268532 title "Short Span Segmental Bridges in Czechoslovakia" @default.
- W2330268532 cites W1552424097 @default.
- W2330268532 cites W2054808441 @default.
- W2330268532 doi "https://doi.org/10.15554/pcij.01011986.106.132" @default.
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