الفهرس يوجد فقط 14 صفحة متاحة للعرض العام
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المستخلص
In this dissertation, the overall structural behavior of composite stub-girder floor system is examined.
Two theoretical approaches are presented for the purpose of determination of the ultimate load-carrying capacity of the stub-girder, and tracing the load-deflection curves from zero load until collapse.
The first approach employs thc finite element method - using standard son ware - for the nonlinear material analysis of idealized two-dimensional stub girder model. This approach furnishes results that are in reasonable agreement with the experimental results.
The second approach presents an analytical model for analyzing the stub-girder system considering the effect of partial-interaction due to shear studs. In the elastic range the method treats the stub-girder as a beam with three distinct layers, the top and bottom layers behave according to the normal beam bending theory, while the middle layer is a shear layer without any bending stiffness. At the interface between the steel and concrete elements, the headed stud shear connectors are modeled as linear elastic built in cantilevers. The method therefore smears the effects of all the contributing shear clements, stubs and studs, along thc span. The differential equation for the girder is derived then the general expression for the elastic deflection is obtained for the case when one concentrated load is applied. The plastic range is based on the plastic zone theory for in- plane beam. In this range the stub-girder is divided into a number of in plane beam segments, and the sections of these segments are further divided into a number of strip elements parallel to the bending axis. The stiffness of each section is obtained by integrating the stiffness of the elastic area of each strip, and the internal axial force and moment of the section are also obtained by integrating the contribution of the resultant force of each strip. [n this approach, the gradual spreading of plastic-zone in the sections and along members can be explicitly traced. Based on this approach a computer program called ”PZA” has been developed. Resu[ts given by the program ”PZA” are in relatively close agreement with the experimental finding.