Author: Publisher: ISBN: 9780921303152 Category : Languages : en Pages : 12
Book Description
The dynamic response of the structure to moving vehicle load is an important consideration in the design of bridges. Dynamic interaction between the vehicle and the bridge amplifies the deflections and stresses in the bridge structure in comparison to those resulting from static application of the vehicle loads. Also, the induced vibrations may cause discomfort to pedestrians using the bridge. A number of theoretical investigations, most of them based on an idealized one-dimensional beam model of the bridge, have been carried out during the past to study the dynamic response of different kinds of bridge. It is obvious that one-dimensional bridge models can not account for the transverse flexural and torsional mode of vibration, particularly in the case of box girder bridges. Three-dimensional vibration studies of such bridges are, therefore, necessary. The study reported in this paper uses the finite method to analyze the dynamic response of simple-span box girder bridges. The bridge structure is discretized by quadrilateral flat thin shell elements. The vehicle is idealized as a two axle, four wheel sprung mass system. The formulation of the equations of motion is presented. Analytical studies are carried out to obtain the characteristic frequencies and mode shapes of the system to investigate the influence of parameters such as aspect ratio, number of diaphragms, and number of bracing on the vibration characteristics of the bridge. For the covering abstract of the Conference see IRRD Abstract no. 807839.
Author: Publisher: ISBN: Category : Languages : en Pages : 13
Book Description
Experimental data from static and dynamic tests on 1/7-scale direct models of simply supported, one- and two-cell, box girder bridges are presented. Variation of flexural and torsional stiffnesses and dynamic characteristics, such as the natural frequency of vibrations and dampinig ratios of the bridge models at different levels of cracking damage, are examined; in turn, these dynamic characteristics can be used to estimate the cracking damage in the bridge. the physical model proved to be an adequate tool for the study of static and dynamic responses of box girder bridges at all load levels.
Author: Fadzli Mohamed Nazri Publisher: Springer ISBN: 303011984X Category : Technology & Engineering Languages : en Pages : 74
Book Description
This book explores the fundamentals of the elastic behaviour of erected precast segmental box girders (SBG) when subjected to static load, as well as the construction process (casting and erection work) involved. It analyzes and compares the experimental results with those obtained using the finite element method and theoretical calculations. A short-term deflection analysis for different loads is obtained by determining the maximum deflection, stress and strain value of single span precast SBG under a variety of transversal slope. The outcome of this work provides a better understanding of the behaviour of precast SBG in terms of structural responses as well as defects, so that maintenance work can then be focused on the critical section at mid span area specifically for the bridge project longitudinally and transversely. The book is of interest to industry professionals involved in conducting static load tests on bridges, and all researchers, designers, and engineers seeking to validate experimental work with numerical and analytical approaches.
Author: Nutt, Redfield, and Valentine Publisher: Transportation Research Board ISBN: 030911750X Category : Box girder bridges Languages : en Pages : 97
Book Description
This report provides specifications, commentary, and examples for the design of horizontally curved concrete box-girder highway bridges. The report details the development of the design procedures. Recommended Load and Resistance Factor Design (LRFD) specifications and design examples illustrating the application of the design methods and specifications are included in appendixes (available on the TRB website at http://trb.org/news/blurb_detail.asp?id=9596).
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Author: Marvin A. Jones
Author: Alex A. Okereke
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Author: Fadzli Mohamed Nazri
Author: Nutt, Redfield, and Valentine
Author: Chang-huan Kou
Author: Chang-huan Kou
Author: Rahmat Ollah Rabizadeh