Strengthening Effect of the External Prestressing Method That Simulated a Deterioration Bridge

Abstract

Various methods for strengthening existing structures have been developed owing to the increase in human and property damages caused by the deterioration of structures. Among the various reinforcing methods, the external prestressing method increases the usability and safety of a structure by directly applying tension to the weak tensile area that suffers the greatest deflection during the structure usage. The external prestressing method is advantageous in reducing cracks caused by the introduced tension and restoration of the deflection. Since the strengthening method is applied to deterioration bridges, the strengthening effect is affected by the condition of the existing structure. However, studies on the strengthening effect according to the degree of deterioration are insufficient. Therefore, the behavior according to the strengthening status was analyzed, and the strengthening effect was identified in this study by simulating the deteriorated bridge, reducing the compressive strength and reinforcement quantity, and conducting a four-point loading test. As a result of the experiment, a reinforcement effect of 215% crack load, 161% yield load, and the difference in behavior according to the reinforcement parameters were confirmed.

Research of the Failure Mechanism and Preventive Strengthening of Prefabricated Small Box Girder under Car Explosion

“…There are several strengthening measures available to improve the working performance of concrete beams in response to their decreased operational state [9][10][11]. However, there is a lack of relevant research on the failure mechanism and preventive strengthening of preventive small box beams under car explosion.…”

Modern Methods of Diaphragm Walls Design

“…The bridge technology described in the article is the prestressing of concrete structures [11,12] (prestressing is a well-known technology in construction, and is used in several types of structures besides concrete, such as steel and wood). The first known use of the prestressing method was recorded in 1930.…”