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Unbonded Monostrands for Camber AdjustmentSethi, Vivek 15 March 2006 (has links)
Prestressed concrete structural members camber upwards or downwards depending upon the location of application of prestress force. Identical members do not camber equally due to variability of the factors influencing it. Differential camber in the beams, if significant, results in excessively tall haunches or girder top flange extending into the bottom of the slab. For adjacent members like deck bulb-tees and box girders that are to be transversely post-tensioned the differential camber causes problems during the fit up process. This variation is undesirable and hinders the smooth progress of construction work if not properly accounted for at the design stage.
Various factors influence camber and camber growth in prestressed members. Some of the factors are concrete strength and modulus, concrete creep and shrinkage properties, curing conditions, maturity of concrete at release of prestress force, initial strand stress, climatic conditions in storage and length of time in storage. Combinations of these variables result in variation of camber of otherwise similar beams at the time they are erected.
One way to increase the precision of camber estimation is to use Monte Carlo simulation based upon the randomized parameters affecting the camber and camber growth. In this method, the parameters, in the form of a probability distribution function, are combined and passed through a deterministic model resulting in camber and camber growth prediction with narrowed probability bounds as compared to single definite value given by most contemporary methods. This outcome gives the expected range of cambers for a given girder design. After determining the expected range of camber, the ultimate goal is to provide guidelines for using unbonded monostrands for camber adjustment. / Master of Science
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Zesílení silničního mostu / Strengthening of the road bridgeNeděla, Lukáš January 2017 (has links)
This thesis deals with the reconstruction of a road bridge with two simple fields over the river Olše in Třinec. The reconstruction of the bridge structure is designed in two versions, for which there is an executed design and assessment of a supporting structure according to applicable standards. The calculation of internal strenght is carried out by using the Scia Engineer 2016 program. This work contains a static calculation, a drawing documentation , an economical comparison of variants and visualization.
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Rekonstrukce mostu / Reconstruction of the road bridgeLaczko, Zoltán January 2012 (has links)
The subject of this thesis is to design a new slab structure instead of the steel concrete slab. The structure of the new load bearing structure is post-stressed cast-in-situ slab with continuous slab structure consisting of three spans. The slab is pre-stressed by monostrands. The load bearing structure is evaluated for first and second limit state too. The construction is modeled in software named Scia Engineer 2011.
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Statické zajištění kostela / Static securing of churchJelínek, Lukáš January 2014 (has links)
This thesis addresses the static security chapel in Medlice. The chapel is a single-Gothic style. The other two dimensions 8x14 m chapels are part of the chapel tower is 20 m high with dimensions of 2,6 x2, 6 m Chapel was built in 1901. The truss chapel was damaged by pests, and therefore, a need to examine and exchange truss. On this occasion, establish a reinforced concrete ring that object until now lacked. In bearing walls of the chapel are visible cracks and occurs because the horizontal bracing object using a technology called monostrands.
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Předpjatá stropní konstrukce nákupního centra / The prestressed floor construction of the shopping centreMiechová, Zuzana January 2012 (has links)
The aim of the Master´s thesis is to design the prestressed floor construction of the shopping centre. The construction is supported by the columns with the maximal span dimensions 16,0*16,6 m. The design is made according to the VSL (VSL International Ltd.)slab system - post-tensioned slab prestressed by the unbonded system of 4 monostrand units. In the thesis there is also made a simplified design of the reinforced concrete floor construction supported with the bigger amount of the columns. It is made a comparison of the both types of the floor slabs and the evaluation of their advantages and disadvantages. The statical analysis and the calculation of the internal forces is assessed by the program Nexis 3.60.15 32.
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