segmental retaining wall lrfd

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MSE Wall Design by LRFD

This example is from AASHTO LRFD Bridge DesignSpecifications:


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Project Information:

User Name: Anna Date: 8/23/2009 Seismic Analysis OFF

Wall Unit Data Wall DataHu=SRW unit height 0.5 m H=Wall height

Wu=SRW unit width 1 m Hemb=Embedded dept

u=Unit Weight of SRW unit 120 kn/m^3 =Angle of back slope

=Wall batter 0 deg ql=Live Surcharge

su=Shear Capacity between segmental unit 400 KN/M qd=Dead Surcharge

u=apparent angle of friction between segmental unit 30 deg =Front slope

Reinforced Soil Data Retained Soil Data

i=Angle of friction of reinforced soil 38 deg e=Angle of friction of

i=Unit Weight of reinforced soil 17.3 kn/m^3 e=Unit Weight of reta

Foundation Soil Data Groundwater

f=Angle of friction of foundation soil 28 deg Hwd

Cf=cohesion of foundation soil 0 kn/m^2 Hwi

f=Unit Weight of foundation soil 20.5 kn/m^3 Hwe

Reinforcement Data

m

Metal Strip Width Horizontal Spacing Metal Strip Load Capacity

Met

Conn

1.0

m KN

LRFD-2 32.100 0.80

REPORT OF SEGMENTAL RETAINING WALL ANALYS

LRFD-Example 2

INPUT DATA

WITH AASHTO METHOD (LRFD)

Name

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0.1656 m

0.2

Kae=Dynamic Coefficient of Lateral Earth Pressure from Retained Soil 0.2

kdyn=Kae-Ka 0.0

e 0.378 e/L 0.076 Nc 25.80 N 16.72

Direct Sliding Fsl 1.72 Overturning Fot 3.17 Bearing Capacity Fbr 12.06

Layer # Elevation LengthAllowable

Strength

Anchorage

LengthEccentricity

CDR

overstressCDR pullou

1 11.7 5.0 32.1 1.8 0.00 6.25 9.18

2 11.0 5.0 32.1 2.1 0.02 4.02 10.71

3 10.3 5.0 32.1 2.4 0.04 2.97 12.33 4 9.7 5.0 32.1 2.7 0.07 2.34 13.78

5 9.0 5.0 32.1 3.0 0.11 1.89 15.02

6 8.3 5.0 32.1 3.4 0.16 1.60 16.36

7 7.7 5.0 32.1 3.7 0.21 1.36 17.46

8 7.0 5.0 32.1 4.0 0.28 1.16 18.27

9 6.3 5.0 32.1 4.3 0.35 1.02 19.18

10 5.7 5.0 32.1 4.8 0.43 0.59 13.39

LRFD-2

LRFD-2

LRFD-2

LRFD-2

LRFD-2

LRFD-2

LRFD-2

Settlement

RESULT OF ANALYSIS

External Stability

Ka=Coefficient of Lateral Earth Pressure from Retained Soil

Internal Stability

Name

LRFD-2

LRFD-2

LRFD-2

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Dead Load Surcharge, ES - p-ES 1.5 1.5 Geosynthetic Tensile Strength & Connection,

Metal Strip Tensile Strength & Connection,

Live Load Surcharge, LS - p-LS 1.75 1.75 Metal Grid Tensile Strength & Connection,

Seismic Load, EQ - p-EQ 0 1 Pullout Resistance,

Vertical Earth Pressure, EV - p-EV 1.35 1.35 Bearing Capacity,

1 1

Active Horizontal Earth Pressure, EH - p-EH 1.5 1.5

AASHTO LRFD FACTORS

Vertical Earth Pressure, EV - p-EV(Sliding & Eccentricity)

Load Factors

StaticStatic-

Seismic

Sear Resistance, (reinforced soil and foundation soil)

Sear Resistance, (reinforced soil and foundation soil)

Resistance Fa

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segmental retaining wall lrfd

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