23 research outputs found
Average Crack Spacing of Overlay-Strengthened RC Beams
No full textThe research is focused on evaluating the average crack spacing of overlay-strengthened reinforced concrete (RC) beams. The current equations in different structural codes for predicting the average crack spacing of RC beam with multilayered-reinforcing bars is proved to be inapplicable for overlay-strengthened RC beam, although these two kinds of beams are both with reinforcement in multi-layers. Therefore, a simple, practical and new analytical model that is capable of predicting the average crack spacing of overlay-strengthened beams is developed. An overlay-strengthened beam element is analyzed based on equilibrium and compatibility equations to formulate the average stresses of concrete, overlay and tension reinforcement. A series of verification comparisons with the experimental investigations, which involved various types of beam elements, are performed to verify the validity and reliability of the model. The proposed model performs satisfactorily with respect to measured response from the experimental database
A Design Proposal for Concrete Cover Separation in Beams Strengthened by Various Externally Bonded Tension Reinforcements
No full textPrevious research has shown that the application of externally bonded reinforcements (steel plates, fiber-reinforced polymer (FRP) laminates, overlays, etc.) to strengthen reinforced concrete (RC) beams can lead to brittle debonding failures before the ultimate load is reached. The aim of this study is to develop an analytical approach for the flexural strengthening of existing structures using various types of external reinforcements and predicting the debonding failure. In this study, an analytical model is developed to predict concrete cover separation failure in beams with overlay strengthening that is also applicable to strengthening using other reinforcements, such as steel plates and FRP laminates. An experimental database with various types of beam specimens is used to verify the model's validity and reliability. A concept for determining the effective strengthening capacity in a strengthening design is presented and the main parameters affecting the strengthening capacity are investigated. Finally, a design proposal is presented for the flexural strengthening of RC beams with respect to concrete cover separation failure. This proposal contributes to the application of external flexural strengthening in practical design
A Design Proposal for Concrete Cover Separation in Beams Strengthened by Various Externally Bonded Tension Reinforcements
No full textSTUDY ON PRACTICAL DESIGN METHOD FOR SHEAR OF REINFORCED CONCRETE SLABS LOADED NEAR FREE EDGE
No full text
NUMERICAL SIMULATION OF ULTIMATE CAPACITY OF STEEL PILE ANCHORAGE IN CONCRETE-FILLED STEEL BOX CONNECTION
No full textABSTRACT This paper presents the comparison of experimental and numerical analysis to determine ultimate capacity of steel pile anchorage in concrete filled steel box connection. In order to simulate the post peak behavior of the connection, a new equation for fracture energy of confined concrete is presented. The fracture energy equation is verified with more simple concrete filled steel tube cases and then installed in the FEM program. Based on the experimental results conclusion can be drawn that the load-deflection curve obtained from the simulation show good correlation with the experimental data
