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ALTERNATIVE # 1: NO BUILD DOWNTOWN DALLAS DART LRT Louise Ave Main St Spur 366 Live Oak St Ross Ave Gaston Ave DEEP ELLUM COMMUNITY Applicable to Entire Project - All 66 Bridge Units BENEFITS CHALLENGES - No Initial Capital Cost - Expected Increase in the Frequency of Repairs - Expected Increase in the Amount of Repairs I-345 FEASIBILITY STUDY PUBLIC MEETING ALTERNATIVE #2: STRENGTHENING SUPERSTRUCTURE BY CONNECTING TOP OF STEEL GIRDERS TO CONCRETE DECK e v A ise ou L F1S F1N DOWNTOWN DALLAS F2S F2N F3S CR6S CR7S CR F3N 1S CR5S CR2S CR4S CR3S CR 8S F 4S F 4N F5S F14S F13S F12S F10S F11S F6S F7S F8S F9S F15 S F5N CR1N F9N F10N F11N F6N F8N F7N F12N CR2N F16S CR8N F1 3N CR3N N CR7 CR4N F14N 6N Drilling into Girders Top Flange and Concrete Deck to Insert CR5N CR F 1 5 N F 1 7 Bolt-Like Connectors. Applicable to All 66 Bridge Units. S F 1 6 N DEEP ELLUM COMMUNITYt F 1 7 N F 1 8 S S BENEFITS n DAR F 1 8 ai T L N F R 1 9 T S - Reduction in Girders M F 1 9 N F 2 0 Deflection, Vibration, S F 20 Bending Stresses, and e N e F 21 v S v A Local Distortion A F 21 N n L i o v F 2 ss 2 - Improve the Structural t S s e o CHALLENGES F 22 N Behavior a O R F 2 3 G S a - Minimize Roadway Impact N F 2 k 3 N F 2 4 - Reduce Maintenance Cost S F 2 S 4 During Construction. N 366 t r I-345 FEASIBILITY STUDY PUBLIC MEETING pu S CONCRETE DECK GAP BETWEEN DECK AND GIRDER GIRDER A TRANSVERSE FLOOR BEAM TRANSVERSE STRANDS AT DECK MID DEPTH LONGITUDINAL DRAPED TENDONS EXISTING CONCRETE COLUMN (TYP) GIRDER B ELEVATION GROUT INFILL HILTI ADHESIVE ANCHORS SECTION AT GIRDER TOP FLANGE ALTERNATIVE #3: ADD COLUMNS FOR SYMMETRICAL SUPPORT [ IH 345 | NB IH 345 [ IH 345 [ IH 345 [ IH 345 | NB IH 345 | NB IH 345 | NB IH 345 PGL PGL PGL LONGITUDINAL JACKED TRANSVERSE GIRDER (TYP) SUPERSTRUCTURE EXISTING FLOOR BEAM POSITION SUPERSTRUCTURE FINAL POSITION SUPERSTRUCTURE POSITION EXISTING CONFIGURATION EXISTING PROPOSED 4'x 4' FRICTION COLLAR PROPOSED 4'x 4' EXISTING EXISTING EXISTING CONCRETE COLUMN EXISTING COLUMNS CONCRETE COLUMN & HYDRAULIC JACK COLUMN ADDITIONAL SYMMETRICAL COLUMNS (NO ROADWAY IMPACT) TO REMAIN COLUMN COLUMN PROPOSED 4'x 4' ADDITIONAL SYMMETRICAL COLUMNS (ROADWAY IMPACT) EXISTING CONCRETE COLUMN EXISTING GRADE EXISTING EXISTING GRADE GRADE GRADE PROPOSED PROPOSED PROPOSED 60" DIA 60" DIA 60" DIA DR SHAFT DR SHAFT DR SHAFT EXISTING TYPICAL SECTION COLUMN CONSTRUCTION SUPERSTRUCTURE JACKING FINAL CONDITION EXISTING STRUCTURE CONSTRUCT ADDITIONAL INSTALL FRICTION COLLAR INSTALL NEW BEARING PAD ASYMMETRIC AT VARIOUS COLUMNS PRIOR TO ROAD AND RAISE SUPERSTRUCTURE AND LOWER SUPERSTRUCTURE LOCATIONS CLOSURE AS REQUIRED USING HYDRAULIC JACK TO FINAL POSITION PROPOSED CONSTRUCTION SEQUENCING UNIT F17S DOWNTOWN DALLAS I-345 BRIDGE PLAN (MAINLANES) FROM LOUISE AVE TO ROSS AVE SCALE= 1"= 200' LEGEND: SPANS WITH ASYMMETRICAL COLUMNS F16S Oak Live SPANS WITH SYMMETRICAL COLUMNS 230+00 F17S F15S 230+00 EXISTING COLUMNS F14Sb 235+00 SB COLL F14Sa 230+00 ADDITIONAL COLUMNS (NO ROADWAY IMPACTS) F14N F13S225+00 F15N 235+00 ADDITIONAL COLUMNS (WITH ROADWAY IMPACTS) F13N RAMP N F16N 235+00 F18S EXISTING BRIDGE COMPONENTS F12N F12S RAMP M 240+00 F17N F11N F19S 220+00 240+00 F11S NB COLL F18N 240+00 F20S F10N F19N 245+00 F10S 215+00 F9N 245+00 Ave Ross F9S F21S RAMP L F20N 245+00 F8S F8N 250+00 F7S F22S 250+00 210+00 F21N SOUTHBOUND F7N 250+00 I-45 / US 75 CONN G F6S CONN J F23S Pacific Ave DART LRT 255+00 F22N CONN N EXISTING - UNIT F20N F6N 255+00 F5S 205+00 255+00 SOUTHBOUND F4S F5N F23N I-45 / US 75 F3S 200+00 F2S 195+00 F4N F1S 190+00 260+00 F3N NORTHBOUND F2N CONN P I-45 / US 75 F1N St Oak Live 120+00 NORTHBOUND Main St 260+00 ADDITIONAL COLUMNS I-45 / US 75 DEEP ELLUM COMMUNITY Ave Gaston 100 0 100 200 SCALE IN FEET San Jacinto St Jacinto San PROPOSED - UNIT F20N Ave Louise Not Applicable to Entire Project, Only Units with Existing Asymmetrical Column Spacing BENEFITS CHALLENGES -Reduce Span Lengths -Minimize Roadway Impacts During Construction -Reduce Local Distortion -Maintaining Horizontal / Vertical Clearances -Reduce Structural Stresses -Construction of Columns / Installation of Bearings -Reduce Maintenance Costs I-345 FEASIBILITY STUDY PUBLIC MEETING ALTERNATIVE #4: STRENGTHEN LOCAL CONNECTIONS eam r B G loo ird F er Floor Beam Welded Threaded Girder Studs with F2437 DTIs A325 Bolts with A325 Bolts with F959 DTIs F959 DTIs Not Applicable to Entire Project - Only Connections That Need Improvement BENEFITS CHALLENGES - Reduce Local Stresses - Minimize Roadway Impact During Construction - Strengthen Connections - Reduce Maintenance Costs I-345 FEASIBILITY STUDY PUBLIC MEETING ALTERNATIVE #5: STRENGTHENING SUPERSTRUCTURE BY ADDING GIRDERS AND BENT CAPS Units where Alternative 5 Applies N DOWNTOWN DALLAS e v A e v s A s T o e R L 366 R s RT i DA r L ou i pu v L e S t e O S v a n A i k a n S o M t t s a DEEP ELLUM COMMUNITY G Additional precast bent caps at existing columns and longitudinal steel girders from below bridge deck. Applicable to 51 bridge units out of a total of 66 bridge units R E D BENEFITS CHALLENGES IR G L - Reduce Deflection, Bending - Maintain Required Vertical TEE S W E Stresses, and Local Distortion in the Clearances N Girders - Minimize Roadway Impact ENT CAP NEW CONCRETE B - Improve Structural Performance During Construction - Reduce Maintenance Cost I-345 FEASIBILITY STUDY PUBLIC MEETING ALTERNATIVE #6: RAPID BRIDGE REPLACEMENT (ROLL - OUT / ROLL - IN) A TYPICAL ROLLING SEQUENCE ROLLED OUT DECK UNIT CONSTRUCTION 1 Erect towers on both sides of existing deck (ED). (ED) TOWERS 2 Build new decks (ND), north and south units EXISTING S.B. DECK UNIT (ED) CL I 345 on tower lower and upper platforms. EXISTING N.B. DECK UNIT (ED) 3 As needed, some substructures may be abandoned and new aligned columns or bents will be NEW DECK UNIT (ND) CONSTRUCTION constructed. TOWERS A 4 Roll-out existing decks (ED) over rolling platform to (ESTABLISHED BY STRESS PATTERNS) construction towers. PLAN 5 Hydraulically lower existing deck unit (ED) for controlled dismantling. EXISTING EXISTING BRIDGE BRIDGE 7 6 Roll-in new deck unit into final position. 6 (ED) (ED) (ND) 4 (ED) (ND) (ED) 1 3 5 1 7 Connect precast rails to (ND). ROLLING PLATFORM 2 8 Dismantle and relocate towers and footings to CONSTRUCTION/LIFT next unit to be replaced. PLATFORMS SECTION A-A Applicable at selected bridge units temporary towers can be erected BENEFITS CHALLENGES - Fast Construction - Construction of Temporary - Minimum Roadway Impact Foundation for Each Tower - Improve Structural Performance - Limited Application - Reduce Maintenance Cost I-345 FEASIBILITY STUDY PUBLIC MEETING ALTERNATIVE #7: FAST TRACK SUPERSTRUCTURE AND BENT CAP REPLACEMENT (SIMILAR TO I-45 "PIERCE ELEVATED", HOUSTON) [ IH 345 [ IH 345 | SB IH 345 | NB IH 345 | SB IH 345 | NB IH 345 12'-0" 12'-0" 12'-0" [ IH 345 [ IH 345 56'-0" ROADWAY 56'-0" ROADWAY 56'-0" ROADWAY [ IH 345 | SB IH 345 | NB IH 345 | SB IH 345 | NB IH 345 | SB IH 345 | NB IH 345 PGL PGL PGL PGL PGL PGL PGL PGL 2.083% 2.083% 2.083% ADDITIONAL COLUMN EXISTING COLUMNS TO REMAIN EXISTING EXISTING EXISTING EXISTING EXISTING GROUND GROUND GROUND GROUND GROUND EXISTING TYPICAL SECTION SUPERSTRUCTURE REMOVAL COLUMN MODIFICATION CAP INSTALLATION SUPERSTRUCTURE CONSTRUCTION CONSTRUCT ADDITIONAL REMOVE EXISTING REMOVE TOP OF COLUMN INSTALL BENT CAPS INSTALL PRESTRESSED COLUMNS PRIOR TO ROAD SUPERSTRUCTURE AS AND ADD BENT ONTO EXISTING COLUMNS CONCRETE GIRDERS. CAST CLOSURE AS REQUIRED SHOWN CROSS-HATCHED CONNECTION RODS BRIDGE DECK AND RAIL. CONSTRUCTION SEQUENCING DOWNTOWN DALLAS I-345 BRIDGE PLAN (MAINLANES) FROM LOUISE AVE TO ROSS AVE SCALE= 1"= 200' LEGEND: EXISTING COLUMNS F16S Oak Live ADDITIONAL COLUMNS 230+00 F17S F15S 230+00 PROPOSED SUPERSTRUCTURE FRAMING F14Sb 235+00 SB COLL F14Sa 230+00 PROPOSED BENT F13S225+00 F14N F15N 235+00 PROPOSED BENT / END OF DECK F13N RAMP N F16N 235+00 F18S DEMOLITION OF EXISTING F12N F12S RAMP M 240+00 F17N F11N F19S 220+00 240+00 F11S NB COLL F18N 240+00 F20S F10N F19N 245+00 PIERCE ELEVATED CORRIDOR - HOUSTON F10S 215+00 F9N 245+00 Ave Ross F9S F21S RAMP L F20N 245+00 F8S F8N 250+00 F7S F22S 250+00 210+00 F21N SOUTHBOUND F7N 250+00 I-45 / US 75 CONN G F6S CONN J F23S Pacific Ave DART LRT 255+00 F22N CONN N F6N 255+00 F5S 205+00 255+00 SOUTHBOUND F4S F5N F23N IHI-45 45 / / US US 7575 F3S 200+00 F2S 195+00 F4N F1S 190+00 260+00 F3N NORTHBOUND F2N CONN P I-45 / US 75 F1N St Oak Live 120+00 NORTHBOUND Main St 260+00 IHI-45 45 / / US US 7575 COLUMN MODIFICATION DEEP ELLUM COMMUNITY Ave Gaston 100 0 100 200 SCALE IN FEET San Jacinto St Jacinto San Louise Ave Louise Similar to I-345, TxDOT successfully temporarily closed 1.5 Miles of elevated I-45 in Downtown Houston and reconstructed Northbound Bridge in 88 Days and Southbound Bridge in 72 Days. CAP INSTALLATION BENEFITS CHALLENGES -Conventional Bridge Construction -Traffic Operations During Construction -Short Construction Duration -Geometric Design Criteria -Reduce Maintenance Costs -Business / Resident Impacts During Construction PRECAST CAP / SUPERSTRUCTURE CONSTR.