DIANA后张板桥开裂的调查起因和维修.pptx

FORENSIC STRUCTURAL ENGINEERING:INVESTIGATIONS, CAUSES REFURBISHMENT OF CRACKING IN A POST-TENSION SLAB BRIDGEANA IRENE LOREA – INGENIERíA ZERO S.L. FORENSIC STRUCTURAL ENGINEERING: INVESTIGATIONS, CAUSES REFURBISHMENT OF CRACKINGIN A POST-TENSION SLAB BRIDGEFSE INVESTIGATIONS, CAUSES REFURBISHMENT OF CRACKING IN A POST-TENSION SLAB BRIDGESCENARIOCURRENT STATE OF THE BRIDGEOPERATING PROCEDURE HYPOTHETICAL CAUSESIDEALISATION OF THE STRUCTUREGEOMETRYPOST-TENSIONING TENDONSREINFORCEMENTSMATERIALSSTAGESMODEL ISSUESSIMULATION AND ANALYSISGLOBAL RESISTANCESERVICEABILITY LIMIT STATESREFURBISHMENTCONCLUSIONS SCENARIO THE BRIDGEFSE INVESTIGATIONS, CAUSES REFURBISHMENT OF CRACKING IN A POST-TENSION SLAB BRIDGEAGETYPOLOGY– 12 years– post-tension concrete slab bridge PC-45MPaMAIN FEATURES– curved in plan R=70m– skewed abutments– structural concrete upper spine– h.b = 1.10+0.25+1.05 = 2.40m– L.c = 48.0m– L.a = 37.5m slenderness = L/20 apparent slend. = L/37 FSE INVESTIGATIONS, CAUSES REFURBISHMENT OF CRACKING IN A POST-TENSION SLAB BRIDGEdeck SCENARIO CURRENT STATE OF THE BRIDGE EXCESIVE CRACKING - overpasses crack width limit – bottom footpath- abt.2 footpathabt.2– bottom deck- abt.2 abt.2 FSE INVESTIGATIONS, CAUSES REFURBISHMENT OF CRACKING IN A POST-TENSION SLAB BRIDGE– upper spine – side face abt.2SCENARIO CURRENT STATE OF THE BRIDGE – upper spine - top face FSE INVESTIGATIONS, CAUSES REFURBISHMENT OF CRACKING IN A POST-TENSION SLAB BRIDGESCENARIO CURRENT STATE OF THE BRIDGE – upper spine - side face abt.1 OPERATING PROCEDUREFSE INVESTIGATIONS, CAUSES REFURBISHMENT OF CRACKING IN A POST-TENSION SLAB BRIDGEIDEALISATION HYPOTHETICAL CAUSES SIMULATIONREFURBISHMENT REPAIR ANALYSIS FSE INVESTIGATIONS, CAUSES REFURBISHMENT OF CRACKING IN A POST-TENSION SLAB BRIDGEOPERATING PROCEDURE - HYPOTHETICAL CAUSESEARLY THERMAL CRACKcrack inducer.REINFORCEMENT DIRECTIONnot orthogonal.CONCRETED IN AUGUST WITH 40 DEGREESdecrease of concrete resistance (fck a