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AASHTO LRFD

AASHTO LRFD


DeepEX implements AASHTO LRFD specifications and load combinations for shoring design and analysis. This section examines and presents the AASHTO LRFD specifications.


AASHTO LRFD is the general governing design code for bridges and other highway structures in the United States. In AASHTO all structures shall be designed for specified limit states to achieve the objectives of constructibility, safety, and serviceability, with due regard to issues of inspectability, economy, and aesthetics. These design factors also apply to the design of earth retention systems such as vertical pile walls, gravity walls, etc.


LRFD stands for Load Factor Resistance Design. In the LRFD philosophy the design of each structure is performed by examining a set of load and resistance force combinations. As such, loads are multiplied by partial safety factors while resistances are divided by another set of partial safety factors and this in theory produces an ultimate limit state (i.e. just prior to failure). All partial safety factors are supposed to be calibrated against a wide number of cases that in essence produced similar overall safety factors with older allowable stress design methods.


In AASHTO LRFD the load combinations are described as Limit States. Further AASHTO differentiates between Strength and Extreme limit states with the following specific decriptions:


Strength I—Basic load combination relating to the normal vehicular use of the bridge without wind.


Strength II—Load combination relating to the use of the bridge by Owner-specified special design vehicles, evaluation permit vehicles, or both without wind.


Strength III—Load combination relating to the bridge exposed to wind velocity exceeding 55 mph.


Strength IV—Load combination relating to very high dead load to live load force effect ratios.


Strength V—Load combination relating to normal vehicular use of the bridge with wind of 55 mph velocity.


Extreme Event I—Load combination including earthquake. The load factor for live load γEQ, shall be determined on a project-specific basis.


Extreme Event II—Load combination relating to ice load, collision by vessels and vehicles, check floods, and certain hydraulic events with a reduced live load other than that which is part of the vehicular collision load, CT. The cases of check floods shall not be combined with CV, CT, or IC.


Further combinations are also defined for serviceability and fatigue although the latter are not particularly important for earth retaining structures and deep excavations.


Our software DeepEX includes all AASHTO LRFD 2010 bridge design combinations.


 

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AASHTO LRFD LOAD COMBINATIONS


AASHTO LRFD 2010 Bridge Design Specifications utilize a number of partial safety factors on loads and resistances for the design of all structures. Each factor relates to a limit state as described in the AASHTO LRFD page within our webpage. For earth retaining structures many combinations do not make significant difference unless considerable external loads are applied to the earth retaining structure.


AASHTO LRFD Load Combinations


AASHTO LRFD Load Combinations


Ultimate Limit State and LRFD Design for Deep Excavations


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DeepEX - Shoring Design Software

DeepEX - Shoring Design Software


DeepEX is the ultimate software program for design and analysis of Deep Excavations! Design any wall type and support system in the most efficient way!

  • Structural and Geotechnical Design

  • Modern Interactive Interface

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  • Limit Equilibrium - Non-Linear - Finite Element Analysis

  • 2D Design Sections  - 3D Frame Analysis



 

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Wall Types in DeepEX


  • Soldier pile and lagging walls

  • Secant and tangent pile walls

  • Sheet pile and box sheet pile walls

  • Diaphragm (slurry) walls

  • Soldier pile and tremied concrete (SPTC) walls

  • Combined sheet pile walls

  • Create unlimited wall sections in each project

  • Check quickly different options

  • Extensive international databases of steel beams and steel sheets

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  • Manage all properties througn user-friendly dialogs



 

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Support Types in DeepEX


  • Ground anchors (Tieback supports)

  • Struts

  • Slabs

  • Rakers

  • Fixed supports

  • Springs

  • Walers

  • Add waler beams to supports

  • Add passive heelblocks to rakers

  • Graphically add supports

  • Manage support properties through user-friendly dialogs

  • Select support steel sections from implemented lists

  • Optimize supports



 

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External Loads in DeepEX


  • Linear loads and surcharges on ground surface

  • Linear loads and surcharges on the walls

  • Prescribed conditions on the walls

  • External moments on the walls

  • 3D loads (3D surface loads, buildings, footings)

  • Graphically add loads

  • Manage load properties from user-friendly dialogs

  • Elastic load equations



 

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