Tool for analysis of early age transverse cracking of composite bridge decks.
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2011-08-29
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Abstract:"Executive Summary: Computational methods and associated software were developed ; to compute stresses in HP concrete composite bridge decks due to temperature, shrinkage, and ; vehicle loading. The structural analysis program uses a layered finite element model. Before ; running the structural analysis code, layer-by-layer time history temperatures due to hydration ; heat are computed using a thermal finite element analysis program. Nodal coordinates for the ; thermal finite element analysis are generated from the layer thicknesses of the structural analysis ; finite element model. Autogeneous shrinkage, drying shrinkage, and stress relaxation due to ; creep are taken into account using models based on HP concrete test data. The software ; computes time-history residual stresses for 28 days. After 28 days an HS25 vehicle load is ; additionally applied. Longitudinal stress levels are printed layer by layer for comparison with the ; modulus of rupture and assessment of cracking. A composite bridge specimen was built in the ; structures testing lab in Clarkson University with thermocouple and strain gage instrumentation. ; After monitoring temperatures and strains for 28 days, the test specimen was loaded by a ; concentrated load applied by universal testing machine. Cracking under loading was observed ; and monitored. Software predictions were compared with test data. A one-day training course ; was conducted in Albany for NYSDOT engineers on August 3, 2011 to communicate the ; research findings and recommendations as well as provide training for the use of the developed ; software. ; This report is organized into seven parts. Each part number is associated with the corresponding ; task number."
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Main Document Checksum:urn:sha-512:7b1b2c3ff7e19556d9507238c7a7c2d00c8488b279e0d7615ac679065ebd78312971f7511bd26c861935f27c2aa20de2b8cf77348c9e0b32084bf043fc7cce43