Study On Shear Resistance Of PVA-ECC In Alveolar Bridge Deck Pavement

This paper aims at solving problem of pavement layer deformation,delamination and strength failure at domestic and overseas steel bridge deck pavements.This paper puts forward a reasonable alveolar bridge deck/PVA-ECC pavement structure.Through compression and shear tests,three test parameters of tooth spacing,tooth width and tooth height were analyzed.The failure morphology,shear strength?,?-?curve,tangential feature length?₀,and shear modulus K₀ of PVA-ECC pavement were analyzed.The DIC digital image correlation software was used to analyze the displacement field and strain field of the test specimens,and the ABAQUS finite element analysis software was used to simulate the steel bridge deck pavement and compare the stress characteristics of different pavement layer structures,now draw the following conclusions:?1?After PVA-ECC material detachmenting the alveolar of bridge deck structure,it still maintains high shear strength and toughness.?2?The?-?curve of the alveolar bridge deck/PVA-ECC pavement layer mainly includes five phases:contact phase,linear growth phase,nonlinear yield phase,secondary yield phase and slip phase.The tangential feature length?₀ increases first and then decreases with the increase of tooth spacing.The shear strength?and the tangential feature length?₀ increase with the increase of tooth width and height,and the tooth height has the most significant effect on?and?₀.The shear modulus K₀ is mainly determined by the shear modulus of the paving material.?3?According to the DIC digital image correlation technology,the displacement of the pavement layer decreases along the height decreases in alveolar bridge deck/PVA-ECC pavement.The tooth structure bears most of the shear force and transmits the load to the steel deck,protecting the bond between the PVA-ECC and the steel deck.?4?The shear span ratio?₀ has a significant effect on the pavement damage characteristics.By introducing the verticall influence coefficient?,it can be concluded that the shear capacity of the alveolar bridge deck/PVA-ECC pavement is greater when the theoretical shear ratio?₀<1,but it is prone to baroclinic damage.?5?Using DIC analysis,the bonding layer in the epoxy gravel structure bears the major tangential stress,while the pavement material did not participate in the resistance to tangential stress.The?max of the alveolar structure is 10 times that of the epoxy gravel structure,and the tangential feature length?₀ is 0.1 to 0.4mm higher.?6?Using ABAQUS finite element analysis of stress distribution in the alveolar bridge deck/PVA-ECC pavement,and the direction of the principal stress.It can be concluded that the stress distribution of the alveolar pavement layer in each section is more uniform and reasonable than that of the shear nail structure.