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| − | All new bridges on the state system include small details and design checks to resist earthquakes. In Seismic Performance Categories B, C and D, additional design and detailing work is needed because of the increased probability of damaging earthquakes.
| + | For bridge seismic design considerations, see [[751.9_Bridge_Seismic_Design|EPG 751.9 Bridge Seismic Design]]. |
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| − | |[[Image:756 Figure Seismic Performance Categories.gif|340 px|left|Seismic Performance Categories]]||[[Image:756 Figure St. Louis Area.gif|280 px|St. Louis Area]]
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| − | When existing bridges in SPC B, C and D are identified as needing repairs or maintenance, a decision on whether to include seismic retrofitting in the scope of the project should be made based on the location of the bridge, the extent of the rehabilitation work and the expected life of the of the bridge after the work. For example, if the bridge needs painting or deck patching, no retrofitting is recommended. However, redecking or widening the bridge indicates that MoDOT is planning to keep the bridge in the state system with an expected life of at least 30 more years. In these instances, the project core team should consider cost effective methods of retrofitting the existing bridge.
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| − | [[image:756 seismic design.jpg|center|725px|thumb|<center>'''Examples of new and retrofit design features. Diagram is not to scale.'''</center>]]
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Latest revision as of 14:09, 19 July 2024
