Through vehicle loads test, the finite element method with the software ANSYSto establish the entire space models and calculation analysis, checking crack width byhand, it is discovered that transverse stress in box girder exceeding tensile strength ofconcrete is the main cause of longitudinal cracks in prestress concrete continuous boxgirder bridge.
The theoretical model and the practical formulas for calculating the shear crack width of steel fiber reinforced prestressed concrete beams are proposed.
Establishment of the Chart of the Artificial Fracture Width Versus Permeability of Carboniferous Carbonate Rocks in East Sichuan and the Classification of Reservoir
Based on the tests of prismaticle specimens with large sizes, the relationships between average corrosional depth and maximum cracking width, or between average corrosional depth and maximum depth of corroded pits, are obtained.
the actual working conditions are simulated via the model of Ansys. The distribution of stress, the width of crack, and the working condition of rebar are understanded clearly. Accordingly, the security and reliability of the structural design of hydraulic reinforced concrete tunnel are improved.
When the water cement ratio decrease from 0.44 to 0.28, the total length of crack is 2.1 times than before, the max width of crack is 5.9 times than before and the fractal dimension increase form 0.95 to 1.14.The research shows that the plastic shrinkage cracking of concrete is aggravated by reducing the water cement ratio.
Through the research of factors affecting the quantity of water flow in cracks,the authors plot the relation curve between unit water flow and width of crack and obtain the time and the width of cracks which maybe lead to the self-heal of concrete cracks.
Maximum crack width of mortars containing PC is lower, but the development rate of maximum crack width of mortars containing H-UNF is faster in comparison with control mortars.
The proposed theory, which is based on nonlinear analysis and the critical flexural crack width, predicted the debonding failure loads of the specimens relatively well, and can be used for the analysis and design of GFRP-strengthened RC beams.
The purpose of the project was to study the effect of various adhesives used for self-repair on the repair of concrete considering factors such as stress transfer capability, varying crack width, and damping.
To explain the local character of the failure process, a simplified fracture model is introduced which resulted in a relation between a fracture probability parameter and the fracture width in the damaged materials.
Satisfactory fits of maximum load data as well as resistance curves are achieved and values of the three material parameters involved, namely the fracture energy, the strength, and the width of crack band front, are determined from test data.