| Summary: | 碩士 === 國立臺灣科技大學 === 營建工程系 === 104 === High Performance Steel (HPS) is recently introduced by China Steel termed as SBHS500 in Taiwan. Unfortunately, the yield strength of SBHS500 is 500 MPa that is barely greater than the threshold value of 485 MPa and categorized as a noncompact section based on AASHTO LRFD 2012. A noncompact section can only develop its nominal moment strength up to yield stress which may reduce the benefit of using high performance steel. Because there is no further information describing the aforementioned concern, one of the goals in this study is aimed to investigate the economic benefit using SBHS500. Based on literatures, hybrid section configuration for the bridge superstructure is proved to give the best advantage in construction cost. Thus, hybrid section using traditional and high performance steel is configured to investigate its construction cost compared to a section using traditional material alone. In addition to yield strength of 500 MPa, material with higher yield strength is investigated as well to examine if higher yield strength could provide further advantage in weight reduction.
The analysis results show that the use of SBHS500 could effectively reduce the construction cost for both cases of I girder and Tub girder. In addition, using higher yield strength material does not guarantee to reduce the structural weight. It was found that fatigue and deflection are often the factors controlling the girder design. The optimal girder configuration using HPS is also discussed in this research.
|
|---|
