The studies on vibration frequency as well loading capacity of slender systems are very important issues in the design process. Integration smart materials with host structures allows one to create constructions which able adjust different conditions. piezo material belongs group. Application voltage piezoparts leads induction forces can cause prestressing structure. use piezoceramic elements i...

The recovery stress of martensitic shape-memory alloy [SMA] wires can be used to confine concrete, and the confining effectiveness of the SMA wires was previously proved through experimental tests. However, the behavior of SMA wires under recovery stress has not been seriously investigated. Thus, this study conducted a series of tests of NiTiNb martensitic SMA wires under recovery stress with v...

This article presents a simplified stress–strain relationship for the definition of mechanical behavior prestressing strands subjected to chloride-induced corrosion, named SCPS-model (Simplified Model Corroded Prestressing Strands). The constitutive law adopts equivalent spring model, that reproduces overall corroded strand by summing contributions each wire, assumed as working in parallel othe...

The Fe-SMA developed at the Swiss Federal Laboratories for Materials Science and Technology (Empa) has an alloy composition of Fe–17Mn–5Si–10Cr–4Ni–1(V,C) exhibits excellent shape memory effect on heating 160 °C or above. feature equips with a unique self-prestressing ability that can be exploited many civil engineering applications. In addition to ability, high elastic modulus (165 GPa), low c...

This paper presents results from Finite Element Modelling (FEM) of steel-concrete composite beams strengthened with prestressed Carbon Fibre Reinforced Polymer (CFRP) plate. For the purpose of this study, three beams were strengthened using prestressed CFRP plate with three different levels of induced prestressing force. The models were developed using ANSYS FE package. The results of an experi...

The purpose of this study was to compare the known behavior of hydrogen embrittled high-strength steel to the characteristics of environmentallyinduced stress corrosion failure where hydrogen is continuously generated at the specimen surface. The incubation time for the initiation of slow crack growth was accelerated by prestressing for a fixed time below the lower critical limit. These results...

This paper deals with the effect of several residual stress profiles on the fatigue crack propagation in prestressing steel wires subjected to tension loading or bending moment. To this end, a computer program was developed to evaluate the crack front evolution on the basis of the Walker law. Results demonstrate that the absence of residual stresses makes the crack propagate towards a preferent...

This paper discusses the influence of minimum reinforcement on the cracking behaviour of prestressed concrete structures. It deals with the observation and modelling of the reclosing of cracks induced by a permanent compressive stress due to prestressing. A computerised proposed model allows to determine steel-to-concrete slip, bond stress, concrete stress and steel stress along the transmissio...