Civil Project on analysis of pre-tensioned concrete girders construction

ABSTRACT:

Reinforced and prestressed concrete are broadly utilized for the development of major structural building structures. Concrete structures experience trouble with time because of ecological and other troublesome working conditions. To survey the wellbeing and functionality of the troubled cement structure and to take the choice on the conceivable repair measures, it is essential to dependably assess the current level of pressure. Assurance of in-situ stretch on the solid surface is one approach to evaluate the prestressing power accessible in the prestressed solid individuals. Evaluating the current level of worry in prestressed solid structures in benefit is decently a troublesome undertaking and the engineers are frequently looked with the absence of genuine outline/development points of interest and natural administration conditions. In-situ push assurance depends on the estimation of strain discharge because of nearby flexible pressure help, caused by center penetrating and production of tranquil limits.

Three systems, specifically concrete center penetrating method, concrete center trepanning system and concrete core-drilling strain gage technique (CDSG) were produced to assess the in-situ worry under uniaxial and biaxial pressure conditions.

The concrete center penetrating system is a test method for evaluation of in-situ worry under uniaxial stretch condition. This procedure was created by utilizing an exceptional course of action of electrical opposition strain gages appropriately put along outspread and extraneous headings of the proposed center. These gages are associated through a Wheatstone connect circuit, in full extension design, to amplify the reaction of the deliberate strain. A 50mm the instance across the center is bored on the structure up to 50mm profundity and the strain irritations around the center are estimated to assess the current pressure. Research center investigations were directed to assess the unwavering quality of this solid center boring method. Adjustment constants assessed in light of trials are contrasted and the qualities assessed utilizing numerical examination. This system is appropriate for prestressed solid supports where braces are longitudinally prestressed. This solid center penetrating strategy can be utilized to decide the in-situ worry with upgraded affectability “in-benefit” prestressed solid structures.

To gauge the in-situ worries under bi-hub stretch state, solid center trepanning strategy was created. This method utilizes a three component strain gage rosette to gauge the strain discharge because of center boring. The unwavering quality of this system was built up by directing trial examinations, in the research center, on solid examples with known stretch/strain field. The consequences of exploratory examination are thought about with those acquired from limited component examination. The numerical investigations and lab tests have unmistakably shown that the proposed strategy is proficient in evaluating the current worries under bi-pivotal pressure state.

Another strategy called solid center penetrating strain gage (CDSG) procedure was created by the reasonable arrangement of electrical opposition strain gages around the center for evaluation of in-situ push. This system utilizes six strain gages in which three strain gages are put radially and the remaining three put digressively and by consolidating the spiral and extraneous gages in a half-connect Wheatstone connect circuit to enhance the pressure estimation exactness. The reasonableness of the gage position and arrangement has been defended utilizing flexible examination of a continuum with a through the gap. Alignment constants assessed in view of exploratory outcomes is looked at

with consequences of limited component technique. The unwavering quality of the method was set up from lab examines with a known pressure field under the bi-hub stretch state.  Three trial systems were created to assess the in-situ worry under uniaxial and biaxial pressure state. The definite approach and methodology of trial and numerical examinations completed to assess the in-situ focuses are exhibited in this postulation.

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