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6 Investigation of Luminaire Pole and PSST Crash Tests and Simulations
Pages 178-208

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From page 178... ... Recently, two full-scale crash tests were conducted on steel luminaire poles with a TB1-17 transformer base according to MASH test no. 3-60 impact conditions at TTI. Read the entire page →
From page 179... ... 730 12.1 6 FAIL -01-1 MASH Limit 440862 Within TTI Full-Scale MASH 3-60 40 Dual 10 11 ga. 553 22.6 5.8 FAIL -01-2 MASH Limit 179 PRE-PUBLICATION DRAFT -- Unedited Text and Graphics Read the entire page →
From page 180... ... under MASH test no. 3-60 impact conditions with a vehicle center impact point, as shown in Figure 143. Read the entire page →
From page 181... ... PRE-PUBLICATION DRAFT -- Unedited Text and Graphics Figure 145. Vehicle Damage – TTI Test No. Read the entire page →
From page 182... ... PRE-PUBLICATION DRAFT -- Unedited Text and Graphics Figure 146. Sequential Photographs, TTI Test No. Read the entire page →
From page 183... ... The total weights of the tested systems were 553 lb and 815 lb for TTI and FOIL, respectively. Unexpectedly, the TTI test failed to meet MASH criteria for both roof crush and OIV, while the FOIL system, with a larger weight and longer mast arms, passed all MASH criteria. Read the entire page →
From page 184... ... Pole Crash Test Setup – TTI Test No. 440862-01-2 [Testing performed under Project 0-6968 used with permission from TTI and TxDOT] Read the entire page →
From page 185... ... PRE-PUBLICATION DRAFT -- Unedited Text and Graphics Figure 149. Vehicle Damage – TTI Test No. Read the entire page →
From page 186... ... PRE-PUBLICATION DRAFT -- Unedited Text and Graphics Figure 150. Sequential Photographs, TTI Test No. Read the entire page →
From page 187... ... 3-60, 3-61, and 3-62 conditions at impact angles of 0 and 25 degrees and impacting the left-quarter, center, and right-quarter points of the vehicle. For efficiency purposes, the pole configurations with maximum wall thicknesses and thus higher weights were exclusively simulated under critical impact conditions (i.e., vehicle center impact point and 0-degree impact angle for MASH 3-60, MASH 3-61, and MASH 3-62 impact conditions) Read the entire page →
From page 188... ... PRE-PUBLICATION DRAFT -- Unedited Text and Graphics Table 33. Updated List of Pole Configurations for Re-Running LS-DYNA Simulations Pole Arm and Mass at CG Mast Arm Mast Thickness Pole Weight Weight Sim. Read the entire page →
From page 189... ... A cell that indicates a medium potential to pass the MASH criteria, meaning that at least one measure of the safety criteria exceeded the preferred limit in MASH or resulted in a concerning value if no preferred limit exists. For occupant compartment deformation, any deformation due to the luminaire pole contacting the vehicle's roof was considered to have medium potential to pass MASH criteria due to the high variability of luminaire pole behavior. Read the entire page →
From page 190... ... In the 25-degree impact, the pole made contact with the center of the vehicle roof, as shown in Figure 151. While acknowledging that such behavior may be a rare occurrence in physical crash tests, the general trend still proves that a 0-degree impact with a center impact point tended to result in more substantial roof crush, recommending this impact scenario for evaluating roof crush. Read the entire page →
From page 191... ... MASH 3-60, Center Impact Point and 0-Degree Impact Angle Figure 151. Case 54-11ga, 20-ft Tall Pole with Dual 4-ft Long Mast Arm – Pole Contacting Vehicle's Roof 191 PRE-PUBLICATION DRAFT -- Unedited Text and Graphics Read the entire page →
From page 192... ... Medium potential to pass MASH (0.0 in. < deformation ≤ 4.0 in.) Read the entire page →
From page 193... ... , MASH 3-61 and MASH 3-62 Pole Arm and Mass at CG MASH 3-61 MASH 3-62 Mast Arm Mast Thickness Pole Weight Left 1/4 Center Right 1/4 Left 1/4 Center Right 1/4 Sim. Read the entire page →
From page 194... ... , MASH 3-60 Ranked Based on Total System Weight Pole Mast Arm Arm and Mass at CG MASH 3-60 Mast Thickness Pole Weight Left 1/4 Center Right 1/4 Sim. Read the entire page →
From page 195... ... No occurrences were observed in MASH 3-61 and 3-62 impacts that would suggest a scenario in which the pole would come into contact with a highspeed vehicle. As of the present, no full-scale crash tests have been conducted under the MASH 3-61 and 3-62 impact conditions, and the LS-DYNA simulations involving high-speed scenarios have not been validated through these tests. Read the entire page →
From page 196... ... are successfully validated through future full-scale crash testing, it may eliminate the need for conducting MASH 3-62 full-scale crash tests on any pole configuration. Based on simulation results, if a pole passes the OIV criteria in MASH 3-61 impacts, it is highly likely to also meet the OIV requirements for MASH 3-62 impacts. Read the entire page →
From page 197... ... As such, center impacts at 0-degrees can be considered a suitable representative for assessing OIV in various impact scenarios. In several MASH 3-60 impacts cases where the base did not break away (indicated as "NB" in Table 34) Read the entire page →
From page 198... ... were due to either occupant compartment deformation values or OIVs that exceeded MASH limits. A test marked "Med" indicates a medium potential to pass the MASH criteria, meaning that at least one measure of the safety criteria exceeded the preferred limit in MASH or resulted in a concerning value if no preferred limit exists (i.e., OIV > 14 ft/s or/and roof crush between 0 and 4 in.) Read the entire page →
From page 199... ... , MASH 3-60, MASH 3-61, and MASH 3-62 Pole Mast Arm Arm Mass at MASH 3-60 MASH 3-61 MASH 3-62 Mast Thickness Pole Weight Sim. Read the entire page →
From page 200... ... , MASH 3-60, MASH 3-61, and MASH 3-62 Ranked Based on Total System Weight Pole Mast Arm Arm Mass at MASH 3-60 MASH 3-61 MASH 3-62 Mast Thickness Pole Weight Sim. Read the entire page →
From page 201... ... (ft) 0 25 0 25 0 25 0 25 0 25 0 25 0 25 0 25 0 25 1-11ga 20 4 S 0.1196 259 12.01 Med Med Med Med Med Low High High High High High High High High High High High High 54-11ga 20 4 D 0.1196 374 14.60 Med Med Med Low High Low High High High High High High High High High High High High 6-11ga 20 15 S 0.1196 305 13.79 High Med Med Med Med Low High High High High High High High High High High High High 59-11ga 20 15 D 0.1196 467 16.73 Med High Med Med Med Low High High High High High High High High High High High High 19-11ga 30 4 S 0.1196 341 16.66 High High Med High High High High High High High High High High High High High High High 72-11ga 30 4 D 0.1196 457 20.00 High High Med High High High High High High High High High High High High High High High 24-11ga 30 15 S 0.1196 387 18.67 High Med Med High High High High High High High High High High High High High High High 77-11ga 30 15 D 0.1196 549 22.30 High High Med Med High High High High High High High High High High High High High High 78-11ga 30 20 S 0.1196 452 20.60 High High Med High High High High High High High High High High High High High High High 79-11ga 30 20 D 0.1196 678 24.60 High Low Med Med High High High High High High High High High High High High High High 19-7ga 30 4 S 0.1880 470 16.20 High Low Med Med High Low High High High High 72-7ga 30 4 D 0.1880 586 18.98 Low Low High High High High 24-7ga 30 15 S 0.1880 516 17.82 Med High High High High High 77-7ga 30 15 D 0.1880 678 21.21 Low Med High High High High 27-7ga 30 30 S 0.1880 787 24.30 Low Low Low Low Low Low Low Low High High 35-11ga 40 4 S 0.1196 483 21.23 Med Med Med High High High High High High High High High High High High High High 88-11ga 40 4 D 0.1196 599 24.85 High Low Low Med High Low High High High High High High High High High High High High 40-11ga 40 15 S 0.1196 529 23.21 High Med Med Low High High High High High High High High High High High High High High 93-11ga 40 15 D 0.1196 691 27.56 High Low Med Med High Low High Med High High High High High High High High High High 41-11ga 40 20 S 0.1196 594 25.29 High Med Med Low High High High High High High High High High High High High High High 94-11ga 40 20 D 0.1196 820 30.04 High High Med Med High Low High Med High High High High High High High High High High 35-7ga 40 4 S 0.1880 694 20.59 High Low Low Med High Low Med Med High High 88-7ga 40 4 D 0.1880 809 23.43 Low Med Med Med High High 40-7ga 40 15 S 0.1880 740 22.10 Low Low Med Med High High 93-7ga 40 15 D 0.1880 902 25.69 Med High Med Med High High 41-7ga 40 20 S 0.1880 804 23.78 Med Med Med Low High High 94-7ga 40 20 D 0.1880 1031 27.94 Med Low Med Med High Low Low Med High High 48-10ga 50 4 S 0.1345 583 24.81 Low Low Low Low Low Low Med Med Med Med Med Med High High High High High High 101-10ga 50 4 D 0.1345 698 28.92 Med Low Low Med Low Low Med Med Med Med Med Med High High High High High High 53-10ga 50 15 S 0.1345 629 26.94 Med Low Low Med Low Low Med Med Med Med Med Med High High High High High High 106-10ga 50 15 D 0.1345 791 31.96 Low Low Low Med Low Low Med Med Med Med Med Med High High High High High High 48-7ga 50 4 S 0.1880 768 24.19 Low Low Low Med Low Low Med Med High High 101-7ga 50 4 D 0.1880 883 27.57 Low Low Med Med High High 53-7ga 50 15 S 0.1880 814 25.91 Low Med Med Med High High 106-7ga 50 15 D 0.1880 976 30.19 Low Low Low Low Low Low Low Med High High 48-3ga 50 4 S 0.2500 983 23.75 Low Low Low Low Low Low Low Low High High 101-3ga 50 4 D 0.2500 1099 26.54 Low Med Low Low High High 53-3ga 50 15 S 0.2500 1029 25.15 Low Med Low Low High High 106-3ga 50 15 D 0.2500 1191 28.80 Low Low Low Low Low Low Low Low High High Low potential to pass MASH Medium potential to pass MASH 201 PRE-PUBLICATION DRAFT -- Unedited Text and Graphics Read the entire page →
From page 202... ... Chapter 4 provides a summary from these tests. While the test outcomes did not match perfectly with the simulation results for all five crash tests, the overall conclusions drawn from the computer simulations were still deemed valid. Read the entire page →
From page 203... ... Varied Impact Locations and Impact Angle 203 PRE-PUBLICATION DRAFT -- Unedited Text and Graphics Read the entire page →
From page 204... ... These metrics are included in the table and used to assess whether the cases would meet MASH criteria. Green shaded cells in the table indicate that the case met all MASH criteria while red shaded cells indicate that one or more metrics did not meet MASH. Read the entire page →
From page 205... ... Pass Detached elements, fragments, or other debris from the test article should not penetrate or show potential for penetrating the occupant compartment, or present undue hazard to other traffic, Pass pedestrians, or personnel in a work zone. D All Deformations of, or intrusions into, the occupant compartment should not exceed limits set forth in Section 5.3 Roof ≤ 4 in. Read the entire page →
From page 206... ... (in) Meets MASH Criteria Does Not Meet MASH Criteria T Symbol after intrusion number indicates "tearing" is predicted. Read the entire page →
From page 207... ... Similar to the original conclusions, if all impact configurations are considered (i.e., all three impacts with different angles and locations have to meet all MASH criteria) , all PSST sign support configurations would not meet MASH. Read the entire page →
From page 208... ... The parameters included: panel size and thickness, impact angle, impact locations, and wind beam. The simulations showed that the evaluated design did not meet the MASH criteria in almost all configurations. Read the entire page →

From page 178...

... Recently, two full-scale crash tests were conducted on steel luminaire poles with a TB1-17 transformer base according to MASH test no. 3-60 impact conditions at TTI.

6 Investigation of Luminaire Pole and PSST Crash Tests and Simulations Pages 178-208

6 Investigation of Luminaire Pole and PSST Crash Tests and Simulations
Pages 178-208