Performance of Steel Beams Strengthened by Steel Pre-Stressed Cables and Memory Alloys under Static and Dynamic Loads
الموضوعات :reza dadkhah tehrani 1 , Davoud Tavakoli 2
1 - Department of civil engineering, Shahrekord Branch, Islamic Azad University, Shahrekord, Iran
2 - Civil Engineering Department, Shahid Rajaee Teacher Training University, Tehran, Iran
الکلمات المفتاحية: Nitinol, Non-linear analysis of time history, Pre-stressed cables,
ملخص المقالة :
With current progress in engineering science and in order to improve the performance of structures, the issue of strengthening of extant structures has caught many researchers’ attention due to different reasons such as application change, loading increase after construction, and modification of regulations. In this study, the role of pre-stressed cables made of steel and Nitinol in a steel beam under dynamic and static loads along with some different mechanisms was examined. Initially, to locate optimal points, a three-floor structure was designed as the extant structure. Then, a beam was arbitrarily modeled using some different mechanisms that included strengthening with steel and Nitinol pre-stressed cables placed under the lower beam wing at the end of it in V-shaped form from the two sides of the beam to its center. Finally, the structure was analyzed and examined via non-linear static and dynamic analysis of time history. The obtained results finally indicated a positive role of applied mechanisms in the steel beam. Further, the results also showed that the performance of steel beam strengthened with steel and Nitinol pre-stressed cables was better than that of the beam with steel cables. In general, it might be observed that the deflection of the beam center in static and dynamic states had an average reduction of 55 and 60% when compared with the ordinary state.
