Analysis of an aeroelastic bridge system consisting of the fundamental vertical and torsional modes of vibration offers an expeditious assessment of bridge flutter performance. It also produces valuable insight into the multimode coupled bridge response to strong winds. This paper presents closed-form formulations for estimating the modal frequencies, damping ratios, and coupled motions of the ...

The free vibration analysis of simply supported box-girder bridges is carried out using the finite element method. fundamental frequency determined in straight, skew, curved and skew-curved bridges. It important to analyse combined effect skewness curvature because bridge behaviour cannot be predicted by adding individual effects curvature. At first, an existing model considered validate presen...

There are a number of parameters influencing the dynamic and seismic response of bridges. Of these, two important parameters warranting special notice include: the properties of the neoperenes in the state of connection between girders and columns and the shear stiffness of underlying soil in the level of bridge substructure’s connectivity to the ground. In this paper, the effects of these tw...

In a continuing effort to provide a solution, engineers in the Construction and Technology Division (C&T) of the Michigan Department of Transportation (MDOT) are studying alternative bridge deck designs. C&T engineers are six years into a study which could eventually save Michigan motorists a considerable amount of tax dollars. The study compares the performance of isotropic bridge decks with d...

conclusions intelligence care is a comprehensive strategy that in addition to recognizing barriers and bridges of nursing care, with predisposing and precipitating forces it can convert barriers to bridges. results intelligence care emerged as a main theme, has a broad spectrum of categories and subcategories with bridges and barriers, including equality of bridges and barriers (contingency car...

Research on Active Vibration Control System (AVCS) is being carried out to reduce structural vibrations caused by unwanted vibrations in many application areas such as in space, aircraft structures, satellites, automobiles and civil structures (bridges), particularly at low frequencies. The unwanted vibration may cause damage to the structure or degradation to the structure’s performance. The A...

In the 1970's it was reported that there were approximately 2300 track miles of timber railroad bridges in the United States and Canada. For short spans, they offer an attractive alternative to other types of bridges as they are economical, faster to construct and easy to maintain. Current design practices do not allow an independent consideration of the effects of the dynamic loads in sizing o...