Behaviour at the Mid-span of Post Tensioned, Simple Span, Skewed Box Girder Bridges PDF Download
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Author: Shree Krishna Tripathi Publisher: ISBN: Category : Box girder bridges Languages : en Pages : 188
Book Description
Many highway bridges are skewed to maintain the profile of natural obstacles to road like rivers, and depressions. Generally, we analyze straight bridge girders making it a line element which makes our hand calculations simpler. However, if we follow the same procedure for skewed bridges like straight ones, we cannot fully visualize and determine their behavior properly which may lead to over estimation or underestimation on different structural forces like bending moment, shear force and most importantly deflection. It is because when we look on skewed bridges in three dimension, the ends of the bridges are skewed to the centerline of the bridges and we can clearly realize that the concrete materials in the acute side is less than that in the obtuse side. If the skew angle is relatively large, it might be the case that there is unbalancing forces along the cross section of the skewed bridge which might lead to the camber at the center of the bridge to be inclined to the vertical which might tend to rotate the entire bridge about the vertical plane. This implies that highly skewed bridges tend to attract more torsion making the design more complicated. If these aspects are not taken into consideration, the skewed bridges might not be good fit while taking the limit state of serviceability. This thesis paper investigates into the three-dimensional analysis of a skewed bridge. Finite element modeling is utilized to analyze the skewed bridges and we can know how it behaves. After the modeling and analysis of a simple span cast in place post tensioned skewed bridge, it is seen that the deflection and bending moment at the mid-span of a skewed bridge is less compared to the non-skewed bridge. Moreover, a skew effect factor is also found which is very useful while designing skewed bridges.
Author: Shree Krishna Tripathi Publisher: ISBN: Category : Box girder bridges Languages : en Pages : 188
Book Description
Many highway bridges are skewed to maintain the profile of natural obstacles to road like rivers, and depressions. Generally, we analyze straight bridge girders making it a line element which makes our hand calculations simpler. However, if we follow the same procedure for skewed bridges like straight ones, we cannot fully visualize and determine their behavior properly which may lead to over estimation or underestimation on different structural forces like bending moment, shear force and most importantly deflection. It is because when we look on skewed bridges in three dimension, the ends of the bridges are skewed to the centerline of the bridges and we can clearly realize that the concrete materials in the acute side is less than that in the obtuse side. If the skew angle is relatively large, it might be the case that there is unbalancing forces along the cross section of the skewed bridge which might lead to the camber at the center of the bridge to be inclined to the vertical which might tend to rotate the entire bridge about the vertical plane. This implies that highly skewed bridges tend to attract more torsion making the design more complicated. If these aspects are not taken into consideration, the skewed bridges might not be good fit while taking the limit state of serviceability. This thesis paper investigates into the three-dimensional analysis of a skewed bridge. Finite element modeling is utilized to analyze the skewed bridges and we can know how it behaves. After the modeling and analysis of a simple span cast in place post tensioned skewed bridge, it is seen that the deflection and bending moment at the mid-span of a skewed bridge is less compared to the non-skewed bridge. Moreover, a skew effect factor is also found which is very useful while designing skewed bridges.
Author: Phillip M. Holthaus Publisher: ISBN: Category : Languages : en Pages : 42
Book Description
In today's textbooks, analyzing prestressed members and bridges takes a two-dimensional approach. Two-dimensional analysis is the only way to analyze prestressed bridges and members because otherwise the hand calculations are extremely difficult. Skewed bridges, however, need to be analyzed and designed three-dimensionally. Based on engineering inspection, it is possible to tell how a non-skewed symmetric bridge will behave. However, the knowledge of how a skewed bridge will behave cannot be obtained by inspection only. Finite element analysis can be used to model a bridge and discover how the bridge will react to dead loads and post-tensioning forces. When a bridge is built on a skew, the acute corners of the bridge support much less concrete weight than the obtuse corners of the bridge. If the post-tensioning force causes a decrease in load at the acute corners of the skewed bridge and if the skew of the bridge is great enough, there is a concern that there could be uplift at these acute corners of the bridge. Uplift at any corner of the bridge should not be allowed. The objective of this study is to investigate a simple span skewed box girder bridge to see if any uplift occurs at the acute corners of the bridge due to post-tensioning forces. After careful study of a skewed simple span cast-in-place post-tensioned box girder bridge, it was found that the post-tensioning force actually transfers more downward force into the acute corners of the bridge. Based on this study, the post-tensioning force will not cause uplift in the acute corners of the skewed bridge.
Author: Fadzli Mohamed Nazri Publisher: Springer ISBN: 303011984X Category : Technology & Engineering Languages : en Pages : 82
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: J. Paul Guyer, P.E., R.A. Publisher: Guyer Partners ISBN: Category : Technology & Engineering Languages : en Pages : 79
Book Description
Introductory technical guidance for civil and structural engineers interested in design of post-tension box girders for highway and bridge structures. Here is what is discussed: 1. INTRODUCTION 2. MODELING CONCEPTS 3. STRENGTH LIMIT VERIFICATION—FLEXURE 4. STRENGTH LIMIT VERIFICATION—SHEAR.
Author: J. Paul Guyer, P.E., R.A. Publisher: Guyer Partners ISBN: Category : Technology & Engineering Languages : en Pages : 80
Book Description
Introductory technical guidance for civil engineers, structural engineers, highway engineers, bridge engineers and other professional engineers and construction managers interested in design and construction of box girder bridge structures. Here is what is discussed: 1. INTRODUCTION, 2. MODELING CONCEPTS, 3. STRENGTH LIMIT VERIFICATION—FLEXURE, 4. STRENGTH LIMIT VERIFICATION—SHEAR.
Author: Shree Krishna Tripathi
Author: Shree Krishna Tripathi
Author: Phillip M. Holthaus
Author: Fadzli Mohamed Nazri
Author: J. Paul Guyer, P.E., R.A.
Author: 
Author: A. I. Fadl
Author: J. Paul Guyer, P.E., R.A.
Author: 
Author: Alex C. Scordelis
Author: