Design of Roadside Barrier Systems Placed on MSE Retaining Walls (2010) / Chapter Skim
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Pages 169-177
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From page 169... ...
169 A P P E N D I X I AASHTO LRFD Format Design Guideline SECTION 1 DESIGN GUIDELINES 1.1 SCOPE This section provides guidelines to design three components: the barrier–moment slab, the MSE wall reinforcement, and the wall panel. The guidelines are applicable for TL-3 and TL-4 criteria as defined in Section 13 of AASHTO LRFD Bridge Design Specifications, and for inextensible MSE wall reinforcement (e.g., strips, bar mats)
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From page 170... ...
170 1.3 NOTATION horizontal shear load on top of the panel (kips) h a = mo ment arm taken as the vertical distance between th e point of impact of the dyna mi c force and the point of rotation A (ft)
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From page 171... ...
171 1.4 GUIDELINES FOR THE BARRIER 1.4.1 General The barrier, the coping, and moment slab should be safe against structural failure. Any section along the coping and moment slab should not fail in bending when the barrier is subjected to the design impact load.
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From page 172... ...
172 1.4.3 Overturning of the Barrier The factored static moment resistance ( M) of the barrier–moment slab system to overturning should satisfy the following condition (Figure 1.4.1)
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From page 173... ...
173 Rotation Point, A C.G. hA lA Fs Ls W Rotation Point, B lBhB He Panel Leveling pad Traffic Barrier Overburden Soil Moment Slab Coping He = effective height of the impact force (AASHTO LRFD Bridge Design Specifications Figure A13.2-1)
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From page 174... ...
174 1.5 GUIDELINES FOR THE SOIL REINFORCEMENT 1.5.1 General The reinforcement guidelines should ensure that the reinforcement does not pullout or break during the impact of the chosen vehicle. C1.5.1 In this section, the recommendations for the load in the reinforcement due to the impact are based on a pressure diagram and line load diagram back calculated by using the design loads in excess of static earth pressure loads recorded in the tests.
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From page 175... ...
175 d = load factor for dynam ic load (1.0) Q d = dyna mic line load to pull out of the reinforcement (Figure 1.5.2)
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From page 176... ...
176 1.5.3 Rupture of the Soil Reinforcement 1.5.3.1 Pressure distribution approach The factored resistance ( R) to rupture of the reinforcement should satisfy the following condition: R s ps At + d pd At + LL p LL At (1.5.3-1)
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From page 177... ...
177 where, resistance factor (1.0) s load factor for static load (1.0)
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