Abstract:A suspension bridge is the most suitable type for a long-span bridge due to rational use of structural materials. Increased deformability, which is conditioned by the appearance of the elastic and kinematic displacements, is the major disadvantage of suspension bridges. The problem of increased kinematic displacements under the action of symmetrical and non-symmetrical load can be solved by the prestressing. A prestressed suspension bridge with span of 200 m was considered as an object of investigations. The c… Show more
“…The electronic dynamometer work principle is based on changes of electrical bridge resistance. The precision of measurements for the electronic dynamometer is 2.5 N [26]. To connect the deck with the load bearing cable, adjustable suspensions are used, that allow levelling of the deck.…”
Section: Description Of Experimental Modelmentioning
confidence: 99%
“…The deck is connected to the main cable by suspensions in 15 points. Width of the model is equal to 0.4 m [24][25]. The elements of the model of the prestressed suspension structure are made of steel cables with modulus of elasticity 60000 MPa.…”
Section: Description Of Experimental Modelmentioning
confidence: 99%
“…To connect the deck with the load bearing cable, adjustable suspensions are used, that allow levelling of the deck. The suspensions are connected to the cables using U-bolt clips [26], see Fig. 10.…”
Section: Description Of Experimental Modelmentioning
A suspension bridge is the most suitable type for a long-span bridge. Increased kinematic displacements are the major disadvantage of suspension bridges. This problem can be solved by application of prestressed cable truss. Dynamic approach is one of regulated bridge design parts. Simplified determination method of natural-vibration frequencies of prestressed suspension structure and its experimental validation is presented in this paper. Natural-vibration frequencies and mode shapes of the model depending on the prestressing level were determined. It was experimentally proved, that mode shape with one half-wave does not appear for the model. The difference between results, which were calculated by the developed simplified determination method of natural-vibration frequencies of prestressed suspension structure and experimentally achieved by the model testing, does not exceed 20%. Therefore the method is applicable for preliminary dynamic analyses of structures.
“…The electronic dynamometer work principle is based on changes of electrical bridge resistance. The precision of measurements for the electronic dynamometer is 2.5 N [26]. To connect the deck with the load bearing cable, adjustable suspensions are used, that allow levelling of the deck.…”
Section: Description Of Experimental Modelmentioning
confidence: 99%
“…The deck is connected to the main cable by suspensions in 15 points. Width of the model is equal to 0.4 m [24][25]. The elements of the model of the prestressed suspension structure are made of steel cables with modulus of elasticity 60000 MPa.…”
Section: Description Of Experimental Modelmentioning
confidence: 99%
“…To connect the deck with the load bearing cable, adjustable suspensions are used, that allow levelling of the deck. The suspensions are connected to the cables using U-bolt clips [26], see Fig. 10.…”
Section: Description Of Experimental Modelmentioning
A suspension bridge is the most suitable type for a long-span bridge. Increased kinematic displacements are the major disadvantage of suspension bridges. This problem can be solved by application of prestressed cable truss. Dynamic approach is one of regulated bridge design parts. Simplified determination method of natural-vibration frequencies of prestressed suspension structure and its experimental validation is presented in this paper. Natural-vibration frequencies and mode shapes of the model depending on the prestressing level were determined. It was experimentally proved, that mode shape with one half-wave does not appear for the model. The difference between results, which were calculated by the developed simplified determination method of natural-vibration frequencies of prestressed suspension structure and experimentally achieved by the model testing, does not exceed 20%. Therefore the method is applicable for preliminary dynamic analyses of structures.
“…The structure is prestressed. The prestressing level is equal to 60% of the main cable load bearing capacity (Goremikins et al 2012b). …”
Section: Description Of the Investigation Objectmentioning
confidence: 99%
“…2). Usage of cable trusses allows for the construction of bridges with reduced requirements for girder stiffness, but overall bridge rigidity will be ensured by prestressing of stabilization cable (Goremikins et al 2012a). The deck can be made of light composite materials (Goremikins et al 2010a).…”
Abstract.A prestressed suspension structure is a type of structures that allows covering long spans due to rational use of structural materials. Prestressing of a suspension structure allows minimizing cinematic displacements. The prestressed suspension structure with the main span equal to 200 m was considered as an object of investigation. Replacement of a single steel main cable of the prestressed suspension structure by the hybrid composite cable with CFRP (Carbon Fibre Reinforced Polymer) middle layer and external steel layers with cross-section variable by the cable length considerably decreases dead weight of the cable. Hybrid composite cable ensures functioning of the structure in case of destruction of the middle CFRP layer. The considered prestressed suspension structure was investigated by the FEM software ANSYS. Rational steel distribution by the cable length was determined by optimization. Behaviour of the hybrid composite main cable in the case of destruction of the middle CFRP layer was experimentally tested using the physical model. The dynamic coefficient was obtained.
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