Design Guidelines for Test Level 3 through Test Level 5 Roadside Barrier Systems Placed on Mechanically Stabilized Earth Retaining Walls (2022) / Chapter Skim
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100 5 REINFORCEMENT LOADS The BMS systems designed and evaluated in section 4 were placed on top of an approximately 9.8-ft (3 m) tall MSE wall model.
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101 5.1.1 MSE Wall Capacity The forces expected in the reinforcement strips due to gravity load were computed according to AASHTO LRFD (3)
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102 Table 5-2 Unfactored resistance and force in the reinforcing strips for TL-5 MSE wall Test Level Strips Length (ft) Layer Depth (ft)
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103 a) Three-dimensional view of the MSE wall model b)
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104 a) Detail of the panels from RECO b)
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105 - Precast, steel reinforced concrete barrier-coping sections - Cast-in-place steel reinforced moment slabs - Backfill and overburden soil material - Precast steel reinforced concrete wall panels - Unreinforced concrete bearing pad and concrete leveling pad - Steel reinforcement shear dowels connecting the moment slab sections - Steel soil reinforcing strips The elements of the barrier, the panels, and the soil surrounding the impact location were remeshed with an element characteristic size ranging from 0.8 in.
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106 The information collected from the FE analyses includes impact force, barrier displacement, and loads and displacements in the reinforcing strips. For record keeping purposes, the barriers and selected strip locations were assigned an alphanumeric designator that describes their horizontal and vertical position as shown in Figure 5-5.
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107 a) Three-dimensional view of the TL-4 MSE wall model b)
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108 9" 4' 6" 9" 2 5/8" 5" 5 1/2" 5 3/4" 2' 3 4" 1' #6 @ 10"A-A B-B 3'-6" #4 Long. bars (10 in total)
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109 Figure 5-5 Elevation view of the MSE wall showing the strip distribution (TL-4 Impact)
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110 Table 5-3 Summary of the impact loads and barrier displacements for the MASH TL-4 impact simulation. Strip Length (ft)
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111 a) 10 ft long strips b)
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112 Table 5-4 Summary of the total load for the selected strip location (TL-4 impact) Section 50-msec.
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113 strip section B3-F-2nd, respectively. The load–time history of the selected strips is presented in Figure 5-9.
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114 The distribution of the total load in the highest stressed soil reinforcing strip (B6-C-1st) was also studied.
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115 a) Dynamic displacement (impact region)
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116 The permanent displacement of the 24 ft (7.3 m) long strip is almost zero.
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117 5 3/4" 3'-6" 3' 1' #7 @ 8" 512" 1'-4" 8" 1' 7' 112" 1' A-A B-B #7 Long. bars (10 in total)
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118 a) Three-dimensional view of the TL-5-1 MSE wall model b)
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119 Figure 5-15 Time history of MASH TL-5-1 impact load on barriers (50-msec. average)
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120 a) Front view of the barrier (impact of the rear axle of the trailer)
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121 a) 10 ft model b)
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122 10 ft (3.05 m) long, 16 ft (4.9 m)
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123 a) First layer of soil reinforcement b)
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124 B3-F-2nd, and 0.08 in.
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125 Figure 5-20 Damage profile of the panel at B3 (below IP) for TL-5-1 impact.
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126 (b) Permanent displacement (impact region)
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127 4' 3'-4" 1'-2" #7 @ 8" 512" 1'-812" 1' 9' 112" 10" A-A B-B 712" #7 Long. bars (12 in total)
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128 a) Three-dimensional view of the TL-5-2 MSE wall model b)
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129 second and third impact of the tractor-van-trailer for the 9-ft (2.74 m) wide moment slab were 64 kips (285 kN)
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130 (a) Front view of the barrier (impact of the trailer)
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131 a) 10-ft reinforcement length and 9-ft moment slab width b)
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132 simulated in this chapter was modeled on top of the MSE wall panels and, therefore, was designed to rotate about point B The overturning capacity around point A is generally less than that around point B
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133 Table 5-8 Summary of the total load for the selected strip location (TL-5-2 impact) Section 50-msec.
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134 a) First layer of soil reinforcement b)
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135 the second layer for the 12 ft (3.66m) moment slab model with 16 ft (4.9 m)
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136 Figure 5-29 Distribution of the total load (TL-5-2)
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137 (a) Dynamic displacement (b)
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138 3. The loads in the reinforcing strips were found to be larger than the static resistance for pullout.
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139 10. The recommended dynamic pressure distribution for pullout and yielding analyses of the soil reinforcing strip will be revised after the TL-5-1 full-scale crash test.
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