Category:756 Seismic Design: Difference between revisions

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m Per BR, minor updates to Bridge Seismic Design Process Flowchart
EPGsysop (talk | contribs)
Editor, Bureaucrats, modot, Administrators
1,745 edits
m Per BR, clarified seismic information.
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|[[media:756 flow chart 2017.pdf|Bridge Seismic Design Process Flowchart]]
|[[Image:756 Figure Seismic Performance Categories.gif|340px|left|thumb|<center>'''Seismic Performance Categories'''<br/>The entire state of Missouri outside of<br/>Categories B, C and D is Category A.</center>]]
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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 flow chart.pdf|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 “Bridge Seismic Design Process Flow chart”.  
{| style="margin: 1em auto 1em auto" align="left"
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|[[Image:756 Figure Seismic Performance Categories.gif|340px|left|thumb|<center>'''Seismic Performance Categories'''<br/>The entire state of Missouri outside of<br/>Categories B, C and D is Category A.</center>]]||width="5"| ||[[Image:756 Figure St. Louis Area.gif|280px|left|thumb|<center>'''St. Louis Area'''</center>]]||width="5"|
|[[Image:756 Figure St. Louis Area.gif|280px|left|thumb|<center>'''St. Louis Area'''</center>]]
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==LFD==


&nbsp;
All new bridges on the state system shall include some level of seismic design and/or detailing to resist earthquakes per the [[media:756 flow chart.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 flow chart 2017.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 “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 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.
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|'''Bridge Dampers, Seismic'''
==LRFD==
|-
{|style="padding: 0.3em; margin-right:15px; border:2px solid #a9a9a9; text-align:center; font-size: 95%; background:#f5f5f5" width="160px" align="left"  
|[http://library.modot.mo.gov/RDT/reports/Ri01028/rdt05007.pdf Report 2005]
|-
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|[[media:756 LRFD flowchart.pdf|LRFD Bridge Seismic Design Process Flowchart]]
|[http://library.modot.mo.gov/RDT/reports/Ri01028/rdt05007.pdf Summary 2005]
|-
|'''[[media:756 cable stayed bridge.doc|Bridge, Cable-Stayed]], Seismic'''
|-
|[http://library.modot.mo.gov/RDT/reports/Ri05023/or08003.pdf Report 2007]
|-
|'''Earthquake Hazard Assessment'''
|-
|[http://library.modot.mo.gov/RDT/reports/Ri98043/RDT01009.pdf Report 2001]
|-
|[http://library.modot.mo.gov/RDT/reports/Ri98043/Brief.htm Summary 2001]
|-
|'''See also:''' [http://www.modot.gov/services/OR/byDate.htm Innovation Library]
|}
|}
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.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 14:12, 20 March 2018

Seismic Performance Categories
The entire state of Missouri outside of
Categories B, C and D is Category A.
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”.

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