Difference between revisions of "Category:756 Seismic Design"

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All new bridges on the state system shall include some level of seismic design and/or detailing to resist earthquakes based upon an expected seismic event for a given return period. For example, in Seismic Performance Categories B, C and D, both design and detailing work is needed because of the increased probability of damaging earthquakes.
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|[[Media:756 Visio-SeismicRetrofitFlow LFD.pdf|Bridge Seismic Design Process Flowchart]]
 
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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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|[[Image:756 Figure Seismic Performance Categories.gif|340px|center|thumb|<center>'''LFD Seismic Performance Categories'''<br/>The entire state of Missouri outside of<br/>Categories B, C and D is Category A.</center>]]||[[Image:756 Figure St. Louis Area.gif|280px|center|thumb|<center>'''LFD Seismic Performance Categories for St. Louis Area'''</center>]]
 
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==LFD==
  
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All new bridges on the state system shall include some level of seismic design and/or detailing to resist earthquakes per the [[media:756 LFD flow chart 2019.pdf|LFD Bridge Seismic Design Process Flowchart]] and an expected seismic event for a given return period. For example, for a multi span bridge in Seismic Performance Categories B, C or D, both design and detailing work is needed or detailing work only needed shall be determined as per “LFD Bridge Seismic Design Process Flowchart”.
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|[[media:756 LFD flow chart 2019.pdf|LFD Bridge Seismic Design Process Flowchart]]
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When existing bridges are identified as needing repairs or maintenance, a decision on whether to include seismic retrofitting in the scope of the project shall be determined per the “LFD Bridge Seismic Design Process Flowchart”, the extent of the rehabilitation work and the expected life 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.
  
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 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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==LRFD==
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|'''Bridge Dampers, Seismic'''
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|[[media:756 LRFD flowchart 2019.pdf|LRFD Bridge Seismic Design Process Flowchart]]
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|[http://library.modot.mo.gov/RDT/reports/Ri01028/rdt05007.pdf Report 2005]
 
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|[http://library.modot.mo.gov/RDT/reports/Ri01028/rdt05007.pdf Summary 2005]
 
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|'''Bridge, Cable-Stayed, Seismic'''
 
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|[http://library.modot.mo.gov/RDT/reports/Ri05023/or08003.pdf Report 2007]
 
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|'''Earthquake Hazard Assessment'''
 
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|[http://library.modot.mo.gov/RDT/reports/Ri98043/RDT01009.pdf Report 2001]
 
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|[http://library.modot.mo.gov/RDT/reports/Ri98043/Brief.htm Summary 2001]
 
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|'''See also:''' [http://www.modot.gov/services/OR/byDate.htm Innovation Library]
 
 
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All new bridges on the state system shall include some level of seismic design and/or detailing to resist earthquakes per the [[media:756 LRFD flowchart 2019.pdf|LRFD Seismic Bridge Design Process Flowchart]] and an expected seismic event for a given return period. For example, for a bridge in Seismic Design Categories A, B, C or D, seismic analysis or seismic detailing shall be determined as per “LRFD Seismic Bridge Design Process Flowchart”.

Revision as of 15:46, 3 January 2020

LFD Seismic Performance Categories
The entire state of Missouri outside of
Categories B, C and D is Category A.
LFD Seismic Performance Categories for St. Louis Area


LFD

All new bridges on the state system shall include some level of seismic design and/or detailing to resist earthquakes per the LFD Bridge Seismic Design Process Flowchart and an expected seismic event for a given return period. For example, for a multi span bridge in Seismic Performance Categories B, C or D, both design and detailing work is needed or detailing work only needed shall be determined as per “LFD Bridge Seismic Design Process Flowchart”.

LFD Bridge Seismic Design Process Flowchart

When existing bridges are identified as needing repairs or maintenance, a decision on whether to include seismic retrofitting in the scope of the project shall be determined per the “LFD Bridge Seismic Design Process Flowchart”, the extent of the rehabilitation work and the expected life 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.

LRFD

LRFD Bridge Seismic Design Process Flowchart

All new bridges on the state system shall include some level of seismic design and/or detailing to resist earthquakes per the LRFD Seismic Bridge Design Process Flowchart and an expected seismic event for a given return period. For example, for a bridge in Seismic Design Categories A, B, C or D, seismic analysis or seismic detailing shall be determined as per “LRFD Seismic Bridge Design Process Flowchart”.