NONLINEAR DYNAMIC ANALYSIS OF RC BEAMS STRENGTHENED BY VARIOUS PLATING TECHNIQUES
NESREEN MOHMED AHEMED KASSEM;
Abstract
Nowadays strengthening reinforced concrete members by external various types of plates is one of the most rational techniques for repair and rehabilitation. Many materials are used in this field such as steel plate bonding SPB, glass fiber reinforced polymer GFRP and carbon fiber reinforced polymer CFRP and the choice of the appropriate material depends on the structural requirement economical and practical considerations.
In this study, nonlinear finite element analysis is used to distinguish the salient features of plated beams. Five groups of reinforced concrete plated beams flexurally damaged are studied under quasi static loading using various plating types, taking into consideration the effect of material nonlinearity, plate material , thickness of plate, loading history of reinforced concrete plated beams, curtailment length of plate and internal shear steel reinforcement.
In addition, eight groups of reinforced concrete plated beams are investigated under free vibration using various plating types. The effect of plate material, concrete properties of reinforced concrete plated beam, plate thickness , plate width , curtailment length of plate , internal compression steel reinforcement, internal tensile steel reinforcement and internal shear steel reinforcement are considered in this research.
In view of the finite element predictions and analytical stand point, a mathematical fonnula for choosing a suitable plate for flexurally damaged reinforced concrete beam is derived. The main end plate parameters the suitable plate thickness and curtailment length can then be computed . Concepts of continuos damage mechanics CDM are applied to determine the deflection of plated beams taking into consideration the effect of preloading of plated beams. For free vibration analysis, an equivalent damped system for plated beams is proposed to evaluate the response parameters.
The present work indicates that the ultimate loads of the plated beams are generally greater for CFRP then SPB, , while GFRP yields the least capacity. In addition, the geometry of the plate has a direct effect on the ultimate capacity and mode of failure. In comparison with unplated beams, SPB and CFRP are noted to increase the natural frequency under free vibration. However, existence of the plate is found to induce a resisting force to motion which represents an equivalent external damper to plated beams
In this study, nonlinear finite element analysis is used to distinguish the salient features of plated beams. Five groups of reinforced concrete plated beams flexurally damaged are studied under quasi static loading using various plating types, taking into consideration the effect of material nonlinearity, plate material , thickness of plate, loading history of reinforced concrete plated beams, curtailment length of plate and internal shear steel reinforcement.
In addition, eight groups of reinforced concrete plated beams are investigated under free vibration using various plating types. The effect of plate material, concrete properties of reinforced concrete plated beam, plate thickness , plate width , curtailment length of plate , internal compression steel reinforcement, internal tensile steel reinforcement and internal shear steel reinforcement are considered in this research.
In view of the finite element predictions and analytical stand point, a mathematical fonnula for choosing a suitable plate for flexurally damaged reinforced concrete beam is derived. The main end plate parameters the suitable plate thickness and curtailment length can then be computed . Concepts of continuos damage mechanics CDM are applied to determine the deflection of plated beams taking into consideration the effect of preloading of plated beams. For free vibration analysis, an equivalent damped system for plated beams is proposed to evaluate the response parameters.
The present work indicates that the ultimate loads of the plated beams are generally greater for CFRP then SPB, , while GFRP yields the least capacity. In addition, the geometry of the plate has a direct effect on the ultimate capacity and mode of failure. In comparison with unplated beams, SPB and CFRP are noted to increase the natural frequency under free vibration. However, existence of the plate is found to induce a resisting force to motion which represents an equivalent external damper to plated beams
Other data
| Title | NONLINEAR DYNAMIC ANALYSIS OF RC BEAMS STRENGTHENED BY VARIOUS PLATING TECHNIQUES | Other Titles | التحليل اللاخطي الديناميكي للكمرات الخرسانية المسلحة المقواه باستخدام انواع مختلفة من الصفائح | Authors | NESREEN MOHMED AHEMED KASSEM | Issue Date | 2000 |
Attached Files
| File | Size | Format | |
|---|---|---|---|
| NESREEN MOHMED AHEMED KASSEM.pdf | 1.5 MB | Adobe PDF | View/Open |
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