Comparative Study of Prestressed Concrete Girder and Steel Plate Girder for Roadway Over Bridge (original) (raw)
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Economic Review of Variation of Prestressed Girder Length on Bridge Construction Practices
International Journal of GEOMATE, 2020
In the last decade, long-span continuous beam bridges have been built to meet the need of the total bridge length requirements for obstacle avoidance. In almost 100 years of development of bridge construction coupled with the development of concrete technology, the maximum bridge length, which was originally about 20 m, currently has reached a length of 50 m or longer with the use of prestressed construction. The longer girder length will reduce the number of pillars, minimize the possibility of damage to the pillars due to local scouring or expand the coverage of the free area under the bridge. This study aimed to evaluate the economical aspect of the use of prestressed girders with length variations of 40 m, 50 m, and 60 m. The analytical calculations were carried out based on the applicable standards of bridge design. The results of the study indicated that the most economical configuration for a long span bridge (200m-400m) is the use of a prestressed girder length of 50 m with a girder cross-section height of 2.10 m. However for 480m bridge lengths, 60m PCI girder lengths tend to start out lower. It can be concluded that for a longer bridge span, a longer PCI girder is also required.
Analysis and Design of Prestressed Box Girder Bridge by IRC: 112-2011
Bridge construction today has achieved a worldwide level of importance. Bridges are the key elements in any road network and use of prestress girder type bridges gaining popularity in bridge engineering fraternity because of its better stability, serviceability, economy, aesthetic appearance and structural efficiency. In this thesis analysis and design of prestressed concrete bridges (Deck Slab, T-Girder and Box Girder) are carried out using IRC:112-2011. The unified concrete code (IRC:112) published by the Indian Road Congress in November 2011 combining the code for reinforced concrete and prestressed concrete structures represents a new generation code, which is significantly different as compared to previous codes (i.e. IRC:21 for RCC structures and IRC:18 for PSC structures). IRC:21 and IRC:18 stands withdrawn, with the publication of IRC:112. The fundamental difference between IRC:112 and old codes is that IRC:112 based on limit state theory while the previous codes were based on working stress design philosophy.
Analysis and design of prestressed concrete box girder bridge
Bridge construction today has achieved a worldwide level of importance. Bridges are the key elements in any road network Use of box girder is gaining popularity in bridge engineering fraternity because of its better stability, serviceability, economy, aesthetic appearance and structural efficiency. The structural behavior of box girder is complicated, which is difficult to analyze in its actual conditions by conventional methods. In present study a two lane simply supported Box Girder Bridge made up of prestressed concrete which is analysis for moving loads as per Indian Road Congress (IRC:6) recommendations, Prestressed Code (IS: 1343) and also as per IRC: 18 specifications. The analyzed of box girder using SAP 2000 14 Bridge Wizard and prestressed with parabolic tendons in which utilize full section. The various span/ depth ratio considered to get the proportioning depth at which stresses criteria and deflection criteria get satisfied.
OPTIMIZATION OF PRESTRESSED CONCRETE GIRDER
Bridge construction today has achieved a worldwide level of importance. Bridges are the key elements in any road network Use of prestressed concrete I girder bridge is gaining popularity in bridge engineering fraternity because of its better stability, serviceability, economy, aesthetic appearance and structural efficiency. This paper concerned idea about prestressed concrete.In the method of prestressing two types are consider that pre tensioning and post tensioning .At the time of prestressing different losses are consider. These are the losses due to elastic shortening, friction losses, relaxation losses, losses due to creep and shrinkage. In this way total amount of losses in pretensioning and post tensioning calculate and detailed information has given in this report. The objective is to minimize the total cost in the design process of the bridge system considering the cost of materials like steel, concrete, tendons etc. For a particular problem the design variables considered for the cost minimization of the bridge system, are depth of girder, various cross sectional dimensions of the girder, number of tendons, A programme is developed for analysis and designing an low cost prestressed girder in MATLAB R2010a software. The optimtool is used to find out minimum cost of structure Illustrative case of prestressed girder presented and discuss by using active set method from optimtool. Optimization problem is characterized by considering design variables and bound constraints are according to AASHTOO Standards ,IRC 21-2000 bridge specifications .The proposed cost optimization approach is compared with an existing project which leads to a considerable cost saving while resulting in feasible design.
PARAMETRIC STUDY AND ANALYSIS OF PRE-STRESSED CONCRETE BOX GIRDER BRIDGE
The importance of highway bridges in a modern transportation system aims in providing safety and quality in construction. This paper discusses the Parametric study and Analysis of Prestressed Concrete Box-girder bridge and focuses on the Structural Analysis comparison of Simply Supported, Continuous and Overhang bridges for the same loading conditions to find the most economical cross-section for various spans. A three span bridge model with four lanes is considered. Span length being 30m, 36m, 45m, 51m, 60m, 66m, 75m, 81m, 90m, 96m, 105m, 111m and 120m respectively. The live load assigned for the bridge model is IRC Class A Wheeled loading. The Code considered for bridge design is the Indian code (IRC-2000). Analysis is carried out using the computer software CSi Bridge v17.0.
International Journal of Engineering Research and Technology (IJERT), 2021
https://www.ijert.org/a-study-on-the-structural-analysis-and-design-of-a-post-tensioned-girder-bridge-proposed-near-khangaon-village-across-ballari-nala-on-sh-54-in-belagavi-district https://www.ijert.org/research/a-study-on-the-structural-analysis-and-design-of-a-post-tensioned-girder-bridge-proposed-near-khangaon-IJERTCONV9IS09011.pdf This paper focuses on understanding the concept of analysis and design of post-tensioned concrete bridges. For the study, an existing reinforced concrete bridge near Khangaon village, Belagavi, which is in structurally poor condition, is identified. Work has been carried out to propose a new posttensioned prestressed concrete girder bridge with an increased height for the above mentioned site. A post-tensioned girder bridge is designed by working stress method referring to IRC-6, IRC-18, IRC-21 and IS: 1343. Two cases have been studied and a parametric study has been carried out by altering the effective span of the post-tensioned girder, one with an effective span of 30m and the other with 45m. The analysis and design are carried out manually, by preparing analysis and design calculation sheets in MS Excel. The results from the two cases are compared to study the girder forces, structural element sizes and usage of construction material to ultimately propose a cost effective design.
IRJET- ANALYSIS OF PRESTRESSED CONCRETE GIRDER FOR BRIDGES
IRJET, 2020
Bridge construction today has achieved a worldwide level of importance. Bridges are the key elements in any road network and use of pre-stress girder type bridges gaining popularity in bridge engineering fraternity because of its better stability, serviceability, economy, durability, aesthetic appearance and structural efficiency. Normally the type of construction used is reinforced concrete construction, steel construction or steel composite construction. When the span is high reinforced concrete construction is uneconomical due to increase in depth of span. Prestressed member, which are free from tensile stress under working loads, the cross section is more efficiently utilized than reinforced concrete section. Prestressed concrete is used for long span bridges above span length of 10m. Conventionally in Bridge analysis, the Superstructure and Substructure are analyzed separately. The Superstructure is usually a grid consisting of main girders, transverse diaphragms and deck slab. The deck slab is discretized into a grid of line elements. The supports of the main girders are pinned. The superstructure is analyzed for un-factored Gravity loads and Moving vehicular loads as per IRC: 6-2014 and as per IRC: 18-2000. The work discusses about the modelling and analysis pattern of prestressed concrete bridges for different tendon profiles in MIDAS CIVIL software. The curved profile gives reduction in stress level and also deflection compared to straight tendon profile.
International journal of engineering research and technology, 2021
This paper focuses on understanding the concept of analysis and design of post-tensioned concrete bridges. For the study, an existing reinforced concrete bridge near Khangaon village, Belagavi, which is in structurally poor condition, is identified. Work has been carried out to propose a new posttensioned prestressed concrete girder bridge with an increased height for the above mentioned site. A post-tensioned girder bridge is designed by working stress method referring to IRC-6, IRC-18, IRC-21 and IS: 1343. Two cases have been studied and a parametric study has been carried out by altering the effective span of the post-tensioned girder, one with an effective span of 30m and the other with 45m. The analysis and design are carried out manually, by preparing analysis and design calculation sheets in MS Excel. The results from the two cases are compared to study the girder forces, structural element sizes and usage of construction material to ultimately propose a cost effective design.
Dynamic Analysis & Optimization of Prestressed Concrete Box Girder Bridge Superstructure
International Journal for Research in Applied Science and Engineering Technology, 2018
The prestressed concrete bridges have excellent riding characteristics that minimize traffic vibrations, torsional rigidity, less likely to crack prematurely continuous span, strength and the most noteworthy characteristic is natural frequency of vibration hardly matches with vehicle frequency therefore attained spacious acceptance in freeway, highway flyovers, and in modern metro rail systems. As bridges are the important structures should be capable to withstand static as well as dynamic loads specially, earthquake-induced load to achieve a structure that behave at the level of life safety under enormous earthquakes. The present article shows the linear dynamic behaviour of Rectangular girder and Trapezoidal box girder bridge deck and compares static as well as dynamic behaviour. Response spectrum analysis has been performed by using FEM based software in order to check the resonance criteria of bridge and to determine most favourable option from above two. The results show that response parameters for trapezoidal box girder such as bending moment, shear forces, deflection, time period,are increases as the span length increases while fundamental frequency and spectral acceleration decreases. From the study it is finalized that trapezoidal box girder is safer as compared to Rectangular girder bridge superstructure.
IJIERT-LITERATURE REVIEW ON ANALYSIS & DESIGN GIRDER BRIDGE BY USING CSI BRIDGE
NOVATEUR PUBLICATION, 2020
For important and significant reasons, the design of bridges has become very important. Bridges are in favour of improving the road network. Bridges not only help in the flow of traffic without interruption but also maintain the safety of the roads. To check the weather adopted section will perform safely and satisfactorily during the life time of the structure. The bridge designs are compared with different countries design codes and determined which is better and economical. The study shows combination of various loads and sections of girders used to distribute load. the depth of beam decreases, the prestressing force decreases and no of cables decreases attributable to prestressing, additional strength of concrete is used and additionally well governs usefulness.