Amendment 0002 2018 NASA Trent Lott Bascule Load Rating Report.pdf

I. INTRODUCTION

A load rating analysis was performed on all primary superstructure members. The analysis incorporated any deficiencies caused by deterioration, cracks, fractures, and loss of section found in the most recent inspection report. This analysis also examined any repairs installed since the construction of the structure. All ratings were computed in accordance with LFR methodology.

This report includes an analysis of the AASHTO Legal Vehicles (Type 3, Type 3S2, and Type 3- 3), and Specialized Hauling Vehicles (SU4, SU5, SU6, and SU7), which are found in the latest edition of the Manual for Bridge Evaluation (MBE). The Mississippi State Legal Vehicles (H, Concrete, HS-Short, HS-Long, Single Axle, and Tandem Axle) were analyzed as determined by the MDOT’s Bridge Safety Inspection Policy and Procedure Manual. Additionally, the FAST Act’s Emergency Vehicles (EV2 and EV3) were analyzed as determined by FHWA’s Memorandum Information dated on November 3, 2016.

II. ASSUMPTIONS AND GENERAL INFORMATION

o Assumed a 3.0 ksi concrete compressive strength o Assumed a 40 ksi reinforcement yield strength o Detail 24 and 25 on Plan Sheet S25/200CL-A427 not analyzed o Analyzed the Approach #2 beam ends with no taper o Analyzed the floor beam and stringer floor system starting at the trunnion o Assumed an additional 0.1 klf for curb dead load on floor beams from grating, plates, and angles o Assumed a different cross bracing layout between floor beams; however, the correct dead load was achieved o Modeled the steel grid deck as a corrugated steel deck to develop a dead load and moment of inertia because of a Bridge Rating limitation o Applied a linear load to the stringers from the weight of the underside bracing o Modeled the truss as cantilevered between panel points L4 and L0 o Assumed an additional 1% self-load per truss length from connection hardware o Assumed a continuous member at the chord splice locations o Assumed a slip-critical, standard size hole, class A, drilled full size, threads excluded bolt type

III. BRIDGE CONFIGURATION AND RATING DESCRIPTION

This bridge contains four approach spans and one main span. The main span superstructure consists of a double leaf pony truss trunnion bascule, while the approach spans consists of steel multi-girders. The main superstructure supports a steel grid deck with steel curbs and a railing system along the deck edges, and the approach spans support a concrete deck with a concrete curb along the roadway edges. The structure has an overall length of 238.0’ and an overall structure width of 63.67’.

AASHTOWare Bridge Rating Version 6.8.2 was utilized to model and rate the superstructure.

IV. SECTION LOSSES/DEFICIENCIES

No section losses or deficiencies that would affect the load capacity were found in the critical stress regions of this structure based upon the latest bridge inspection report.

V. RECOMMENDATIONS

There are no recommendations at this time. This bridge does not require posting.

Appendix A

LOAD RATING SUMMARY

Bridge Load Rating Summary

Bridge No. 310060704500002 Route 607 Trent Lott Blvd

Feature Intersected Navigable Waterway

LOAD RATING SUMMARY

Truck Type Truck Weight (Tons)

Inventory Rating (Normal Traffic) Operating Traffic (Maximum Load)

Tons Metric Tons Tons Metric Tons

H 20-44 Truck 20 20 18 34 30 HS 20-44 Truck 36 34 30 56 51 Type 3 25 32 29 54 48 Type 3S2 36 46 42 78 70 Type 3-3 40 54 49 91 83

SU4 27 31 28 52 47

SU5 31 32 29 54 49

SU6 34.75 35 32 58 53

SU7 38.75 38 34 63 57

MS H-Truck 26 47 43 MS Concrete Truck 30 44 40 MS HS-Short Truck 40 64 58 MS HS-Long Truck 40 73 66 MS Single Axle 10 27 33 MS Tandem Axle 20 36 24

EV2 28.75 46 42

EV3 43 51 46

DESIGN LOADING: H20-S16-44

X CAPACITY MEETS OR EXCEEDS DESIGN LOAD

CAPACITY IS LESS THAN DESIGN LOAD

ORIGINAL LOAD RATING CALCULATION APPLICABLE

ORIGINAL LOAD RATING CALCULATION REVISED

LOAD RATING ANALYSIS DATE: 6/1/2018

LOAD RATING CONTROLLED BY: GUSSET PLATE U4, MEMBER U4-U3 (FASTENERS);

STRINGERS 2-6 & 11-15 (SERVICE FLEXURE)

LOAD RATING METHOD: LFR

Rated By: Jesse Parrish, E.I. Checked by: Lisa Fruge, P.E.

Date: 6/7/2018 Date: 6/7/2018

Remarks:

Appendix B

TYPICAL SECTION

N ot e:

D im en si on s f ro m p la n se t

Appendix C

TRUCK DIAGRAMS

Appendix D

COMPUTATIONS

Name: JOHN C STENNIS BASCULE BRIDGE Struct-Def: Cantilevered Pony Truss...

Rating Results Summary Report

Bridge ID: 310060704500002 Member: Unit2 Stringer2

NBI: 310060704500002

Member Alt: Stringer 2 Alt

AASHTO LFR Engine Version 6.8.2.3002 Analysis Preference Setting: None Analysis Time: 06/01/2018 08:22:32 Print Time: 06/01/2018 08:51:59

Analyzed By: Bridge Page: 1/1

Live Load Live Load Type

Rating Method

Rating Level

Load Rating (Ton)

Rating Factor Location (ft)

Location Span-(%)

Limit State Impact Lane

H 20-44 Lane LFD Inventory 28.83 1.441 7.27 1 - ( 50.0) Service - Steel As Requested As Requested

H 20-44 Lane LFD Operating 48.14 2.407 7.27 1 - ( 50.0) Service - Steel As Requested As Requested

HS 20-44 Lane LFD Inventory 51.89 1.441 7.27 1 - ( 50.0) Service - Steel As Requested As Requested

HS 20-44 Lane LFD Operating 86.65 2.407 7.27 1 - ( 50.0) Service - Steel As Requested As Requested

H 20-44 Axle Load LFD Inventory 20.41 1.020 7.27 1 - ( 50.0) Service - Steel As Requested As Requested

H 20-44 Axle Load LFD Operating 34.08 1.704 7.27 1 - ( 50.0) Service - Steel As Requested As Requested

HS 20-44 Axle Load LFD Inventory 36.73 1.020 7.27 1 - ( 50.0) Service - Steel As Requested As Requested

HS 20-44 Axle Load LFD Operating 61.34 1.704 7.27 1 - ( 50.0) Service - Steel As Requested As Requested

SU4 Axle Load LFD Inventory 31.21 1.156 7.27 1 - ( 50.0) Service - Steel As Requested As Requested

SU4 Axle Load LFD Operating 52.12 1.930 7.27 1 - ( 50.0) Service - Steel As Requested As Requested

SU5 Axle Load LFD Inventory 35.83 1.156 7.27 1 - ( 50.0) Service - Steel As Requested As Requested

SU5 Axle Load LFD Operating 59.84 1.930 7.27 1 - ( 50.0) Service - Steel As Requested As Requested

SU6 Axle Load LFD Inventory 40.17 1.156 7.27 1 - ( 50.0) Service - Steel As Requested As Requested

SU6 Axle Load LFD Operating 67.08 1.930 7.27 1 - ( 50.0) Service - Steel As Requested As Requested

SU7 Axle Load LFD Inventory 44.79 1.156 7.27 1 - ( 50.0) Service - Steel As Requested As Requested

SU7 Axle Load LFD Operating 74.80 1.930 7.27 1 - ( 50.0) Service - Steel As Requested As Requested

Type 3 Axle Load LFD Inventory 32.48 1.299 5.82 1 - ( 40.0) Service - Steel As Requested As Requested

Type 3 Axle Load LFD Operating 54.25 2.170 5.82 1 - ( 40.0) Service - Steel As Requested As Requested

Type 3-3 Axle Load LFD Inventory 63.11 1.578 5.82 1 - ( 40.0) Service - Steel As Requested As Requested

Type 3-3 Axle Load LFD Operating 105.39 2.635 5.82 1 - ( 40.0) Service - Steel As Requested As Requested

Type 3S2 Axle Load LFD Inventory 51.30 1.425 5.82 1 - ( 40.0) Service - Steel As Requested As Requested

Type 3S2 Axle Load LFD Operating 85.67 2.380 5.82 1 - ( 40.0) Service - Steel As Requested As Requested

EV2 Axle Load LFD Operating 46.79 1.628 7.27 1 - ( 50.0) Service - Steel As Requested As Requested

EV3 Axle Load LFD Operating 51.17 1.190 5.82 1 - ( 40.0) Service - Steel As Requested As Requested

MS1 (H-TRUCK) Axle Load LFD Operating 47.95 1.844 5.82 1 - ( 40.0) Service - Steel As Requested As Requested

MS2 (CONCRETE) Axle Load LFD Operating 44.26 1.475 5.82 1 - ( 40.0) Service - Steel As Requested As Requested

MS3 (HS-SHORT) Axle Load LFD Operating 73.77 1.844 5.82 1 - ( 40.0) Service - Steel As Requested As Requested

MS4 (HS-LONG) Axle Load LFD Operating 73.77 1.844 5.82 1 - ( 40.0) Service - Steel As Requested As Requested

MS5 (TANDEM AXLE Axle Load LFD Operating 36.89 1.844 5.82 1 - ( 40.0) Service - Steel As Requested As Requested

MS6 (SINGLE AXLE) Axle Load LFD Operating 27.26 2.726 7.27 1 - ( 50.0) Service - Steel As Requested As Requested

Stringer 2 through 6 and 11 through 15

Name: JOHN C STENNIS BASCULE BRIDGE Struct-Def: Cantilevered Pony Truss...

Rating Results Summary Report

Bridge ID: 310060704500002 Member: Truss 1

NBI: 310060704500002

Member Alt: Truss 1

AASHTO Truss LFR Engine Version 6.8.2.3001 Analysis Preference Setting: None Analysis Time: 06/07/2018 09:18:24 Print Time: 06/07/2018 09:25:24

Analyzed By: Bridge Page: 1/1

Live Load Live Load Type

Rating Method

Rating Level

Load Rating (Ton)

Rating Factor Element Name

Limit State Impact Lane

EV2 Axle Load LFD Operating 52.29 1.819 U4U3 : U4 Gusset Plate Fastener As Req As Req

EV3 Axle Load LFD Operating 52.98 1.232 U4U3 : U4 Gusset Plate Fastener As Req As Req

H 20-44 Axle Load LFD Inventory 28.66 1.433 U4U3 : U4 Gusset Plate Fastener As Req As Req

H 20-44 Axle Load LFD Operating 47.86 2.393 U4U3 : U4 Gusset Plate Fastener As Req As Req

HS 20-44 Axle Load LFD Inventory 34.12 0.948 U4U3 : U4 Gusset Plate Fastener As Req As Req

HS 20-44 Axle Load LFD Operating 56.98 1.583 U4U3 : U4 Gusset Plate Fastener As Req As Req

SU4 Axle Load LFD Inventory 31.47 1.165 U4U3 : U4 Gusset Plate Fastener As Req As Req

SU4 Axle Load LFD Operating 52.55 1.946 U4U3 : U4 Gusset Plate Fastener As Req As Req

SU5 Axle Load LFD Inventory 32.78 1.057 U4U3 : U4 Gusset Plate Fastener As Req As Req

SU5 Axle Load LFD Operating 54.75 1.766 U4U3 : U4 Gusset Plate Fastener As Req As Req

SU6 Axle Load LFD Inventory 35.28 1.015 U4U3 : U4 Gusset Plate Fastener As Req As Req

SU6 Axle Load LFD Operating 58.91 1.695 U4U3 : U4 Gusset Plate Fastener As Req As Req

SU7 Axle Load LFD Inventory 38.16 0.985 U4U3 : U4 Gusset Plate Fastener As Req As Req

SU7 Axle Load LFD Operating 63.73 1.645 U4U3 : U4 Gusset Plate Fastener As Req As Req

Type 3 Axle Load LFD Inventory 32.33 1.293 U4U3 : U4 Gusset Plate Fastener As Req As Req

Type 3 Axle Load LFD Operating 54.00 2.160 U4U3 : U4 Gusset Plate Fastener As Req As Req

Type 3-3 Axle Load LFD Inventory 54.98 1.374 U4U3 : U4 Gusset Plate Fastener As Req As Req

Type 3-3 Axle Load LFD Operating 91.81 2.295 U4U3 : U4 Gusset Plate Fastener As Req As Req

Type 3S2 Axle Load LFD Inventory 46.77 1.299 U4U3 : U4 Gusset Plate Fastener As Req As Req

Type 3S2 Axle Load LFD Operating 78.11 2.170 U4U3 : U4 Gusset Plate Fastener As Req As Req

MS1 (H-TRUCK) Axle Load LFD Operating 50.89 1.957 U4U3 : U4 Gusset Plate Fastener As Req As Req

MS2 (CONCRETE) Axle Load LFD Operating 49.73 1.658 U4U3 : U4 Gusset Plate Fastener As Req As Req

MS3 (HS-SHORT) Axle Load LFD Operating 64.10 1.603 U4U3 : U4 Gusset Plate Fastener As Req As Req

MS4 (HS-LONG) Axle Load LFD Operating 74.34 1.859 U4U3 : U4 Gusset Plate Fastener As Req As Req

MS5 (TANDEM AXLE) Axle Load LFD Operating 46.94 2.347 U4U3 : U4 Gusset Plate Fastener As Req As Req

MS6 (SINGLE AXLE) Axle Load LFD Operating 44.79 4.479 U4U3 : U4 Gusset Plate Fastener As Req As Req

H 20-44 Lane LFD Inventory 30.26 1.513 L4U4 : L4 Gusset Plate Compression As Req As Req

H 20-44 Lane LFD Operating 50.54 2.527 L4U4 : L4 Gusset Plate Compression As Req As Req

HS 20-44 Lane LFD Inventory 54.48 1.513 L4U4 : L4 Gusset Plate Compression As Req As Req

HS 20-44 Lane LFD Operating 90.97 2.527 L4U4 : L4 Gusset Plate Compression As Req As Req