Design Guide for Bridges for Service Life (2013) / Chapter Skim
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Pages 589-597
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From page 589... ...
587 Expansion joints are one of the main causes for high maintenance costs in bridges. A new seamless bridge system was envisioned within SHRP 2 Project R19A that should result in bridges with long service lives by eliminating the joints over the entire length of the bridge, approach slab, and a segment of the roadway (Ala and Azizinamini in press a and b)
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588 DESiGN GUiDE FOR BRiDGES FOR SERviCE LiFE costs. Figure E.2 shows a transition in which the reinforcement detail helps to maintain the desirable crack pattern (Jung et al.
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589 Appendix E DESiGN STEpS FOR SEAMLESS BRiDGE SySTEM DEvELOpED By ShRp 2 pROJECT R19A Analysis, design, and construction of a seamless bridge and approach slab system are similar to other bridge structures.
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From page 592... ...
590 DESiGN GUiDE FOR BRiDGES FOR SERviCE LiFE developmental phase of the concept of the small piles used to connect the transition slab to the secondary slab. The initial system design is an iterative process in which the length of the transition and secondary slabs; the shape, size, and spacing of small piles; and the embedment depth of the secondary slab are determined via structural analyses of various system configurations.
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From page 593... ...
591 Appendix E DESiGN STEpS FOR SEAMLESS BRiDGE SySTEM DEvELOpED By ShRp 2 pROJECT R19A E.2.1 Approach Slab and Bridge Deck Extra reinforcement may be required in the approach slab for crack control under the tensile in-plane forces resulting from thermal expansion.
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From page 594... ...
592 DESiGN GUiDE FOR BRiDGES FOR SERviCE LiFE E.2.4 Small Piles The stiffness, number, and arrangement of small piles connecting the transition and secondary slabs should be determined to control the longitudinal movement of the transition slab at the end where it meets the pavement. This limit eliminates expansion joint devices at these locations.
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From page 595... ...
593 Appendix E DESiGN STEpS FOR SEAMLESS BRiDGE SySTEM DEvELOpED By ShRp 2 pROJECT R19A E.2.6 geomaterial Design of the geomaterial consists of the selection of the geomaterial type and the compaction requirement.
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From page 596... ...
594 DESiGN GUiDE FOR BRiDGES FOR SERviCE LiFE As shown in Figure E.5, the parameter d Ac 3 can be determined to be d S d2c c 3 for both one and two layers of reinforcement. The crack width allowed is inserted in Equation E.1 to obtain the service stress and strain in the reinforcement.
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From page 597... ...
595 Appendix E DESiGN STEpS FOR SEAMLESS BRiDGE SySTEM DEvELOpED By ShRp 2 pROJECT R19A During the cracked section analysis, if the force in a segment of the slab is smaller than Pcr, the slab will not crack, and no modification will be required in the structural analysis.
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