Stress Analysis Of Prestressed Concrete Slab With Open Hole

There are many constructions with the structure of unbonded prestressed floor slabs in China as the unbonded prestressed technology is widely applied in concrete construction.Due to the change of actual use,the situation of making opening hole transformation to the existing prestressted concrete floor slab because of the change of construction function happens more and more.Opening hole transformation for unbonded prestressed concrete floor will lead to fundamental changes in the floor by the force of the state,it is necessary to accurately assess the impact of openings bring to determine a reasonable reinforcement scheme.Given the current calculation,there is little convenient method to calculate and analyze the existing prestressed floor slab after opening hole transformation.In this case,based on the common equivalent loading method for simply calculation on the prestressed floor slab,it will make some theory revisions according to the specific condition.To simplify the calculation of prestressed floor slab after opening hole transforming and repairing has a positive meaning for engineering practice.This thesis,setting a complex reconstruction in Changsha as engineering background,discussed a simple calculation method of stress analysis the existing prestressed concrete floor slab after openings hol transformation,and rechecked the simple calculation by using finite element analysis method.Contents of this paper is completed as follows:Based on the assumptions of equivalent loading method for simply calculation on the prestressed floor slab,and corrected calculation and conditions for some part boundary then to match the characteristics of prestressed plate openings,it will be deduced the simple calculation of stress state for prestressed floor after opening hole transforming and repairing.Combined with the specific project background,the simple calculation method can meet the accuracy requirement of the engineering analysis by applying it to analyze the behavior of floor slab after opening hole,and comparing with the finite element analysis results of SAFF.idered the background of specific project,and based on the simple calculation and analysis,it’s proposed reasonable reinforcement measures and construction attentions for prestressed concrete floor after open hole transforming.Some conclusions of this paper can be referred for the unbonded prestressed floor.