Search

This paper proposes a vortex-induced vibration (VIV) reliability analysis method based on the maximum entropy (MaxEnt) principle in which constraints are specified in terms of fractional moments involving uncertain wind characteristics, structural properties, and bluff-body aerodynamics. The multiplicative dimensional reduction method (M-DRM) is used to calculate the fractional moments. A new threshold is obtained based on the stopping sight distance in the highway engineering technique standard, which is less strict than the China–Japan standard and the British code and thus better-suited to VIV reliability evaluation. A long-span cable-stayed bridge model is used to illustrate the accuracy and efficiency of the proposed method in comparison to Monte Carlo simulation (MCS) on three performance functions of VIV reliability. The results indicate that VIV maximum amplitude and wind speed failure probability are not sensitive to the selected performance function, but the effect of the wind attack angle on probability is significant. The M-DRM provides a workable alternative approach to analyzing the highly complex VIV reliability of long-span bridges. [ABSTRACT FROM AUTHOR]

Over the course of the past 150 years, since the first iron- and steel-based bridge was constructed in 1868, Japan has become one of the most advanced countries in the construction of steel structures. Various innovative and elegant steel structures were constructed in the past such as the world's longest suspension bridge called the Akashi Kaikyo Bridge. The advances of steel structures were attributed to a significant extent to the development of high-performance steels. Such materials developed in Japan were characterized by three types of versatilities: strength, functional, and sectional. Some examples of such materials include fairly high and low strength steels, high-bridge performance steel, seismic-resistant steel, fire-resistant steel, and size-flexible H-shaped beam. In Japan, these steel material innovations enabled the progress in steel structures to leap forward and in turn challenging new structures gave birth to further advancements in steel materials. In this paper, the advancements of steel structures and materials were reviewed, focusing largely on the steel materials and their contributions to the construction of steel structures. In addition, in light of recently developed innovative steels and their strength-increasing potential, the further advancements of steel materials were suggested for the future innovations of steel structures. [ABSTRACT FROM AUTHOR]

The article presents a research paper which focuses on the construction of the portal frame bridge (PFB) in Japan. It is said that the use of PFBs as an alternative of the integral abutment bridge (lAB) in Japan began from 1995. In a PFB, the structural detailing of the girder-abutment connection is important and generally steel composite girders are used in PFBs.