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In this work, a fatigue crack propagation model developed using dimensional analysis for plain concrete is used in conjunction with the steel closing force to predict the crack growth behavior of reinforced concrete beams. A numerical procedure is followed using the proposed model to compute the fatigue life of RC beams and the dissipated energy in the steel reinforcement due to shake down behavior...
Steel Fiber Reinforced Concrete (SFRC), as a new compound civil engineering material, has been deeply studied in recent years. This paper presents a brief introduction of the basic characters of steel fiber reinforced concrete. Research of SFRC on the following aspects are discussed: the content and size of steel fiber; results of triaxial test; tensile and compressive properties; fatigue resistance;...
The fatigue of cast steel node with initial casting defects was studied by Finite Element Method (FEM) and fracture mechanics. The defects was simulated as cracks in the 3D FEM model and the stress intensity factor of crack tip was calculated. The shape factor function was fitted by the stress intensity factors of different crack length. The permissible defects size could be decided by the fracture...
A 1∶4 model is made to study the fatigue performance of the composite joint for double-deck composite truss bridge. The test results show that the joint remains in a linear elastic state under the fatigue loading. Under constant amplitude loading, the stiffness of the joint reduces gradually. The number of cracks at the interface of steel and concrete is small and the crack length propagates slowly...
The Small-sample up and down fatigue test method was used to test the fatigue limit of casting GS-20Mn5V which is the most popular casting material in civil engineering. The symmetric tension-compression fatigue test was on the high frequency fatigue tester. Ten useful test values were obtained through twelve tests with standard specimens. The mean value of fatigue limit of GS-20Mn5V is 202.8MPa after...
A research program has been carried out to clarify the effect of stray current corrosion of steel in concrete on the fatigue performance of reinforced concrete under the simultaneous action of environmental corrosion and repeated load. The fatigue damage evolution law of reinforcement was analyzed by continuously monitoring the variation of the ultrasound wave velocity flowing through the concrete...
With degeneration of material properties and accumulation of damage under fatigue loading, deformation of steel-concrete composite beams increases. Therefore, it's necessary to evaluate the additional deformation caused by fatigue loads. Based on research results world widely, constitutive relations of materials such as concrete and steel were chosen properly, and simplified calculation formulas of...
Reinforced concrete(RC) structures taking full advantages of concrete and reinforcing steel bars are widely applied in civil engineering. A good-quality concrete provides a highly alkaline environment that forms a passive film on steel bar surface, preventing the reinforcing steel bar from corroding. Under a chloride attack or concrete carbonization, corrosion of embedded reinforcement in concrete...
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