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20320140502009
1.
International Journal of
Civil Engineering and Technology (IJCIET), ISSN 0976 â 6308 (Print), ISSN 0976 â 6316(Online) Volume 5, Issue 2, February (2014), pp. 88-96 © IAEME 88 STUDY OF STRESSES ON COMPOSITE GIRDER BRIDGE OVER SQUARE AND SKEW SPAN M. AMEERUTHEEN1 , Sri. ARAVINDAN2 1 M.Tech, Student, VI semester, Bharath Institute of Science and Technology, Bharath University, Chennai - 600 073 2 Assistant Professor, Bharath Institute of Science and Technology, Bharath University, Chennai - 600 073 ABSTRACT Generally a bridge is defined as a structure spanning a river, road, valley, depression or any other type of obstruction with a purpose to provide through passage of communication. This project is taken to study the stresses on the two lane solid slab and on beam and slab arrangement (composite) on various skew angles by imposing a load of 1t/sq.m and compare the results to study the characteristics of skew deck and also to investigate the skew effect if the bridge is subjected to IRC loading. The following analysis are going to be made using the software STAAD-PRO 1. The effect of stresses in Solid slab & Composite Bridge Deck slab- comparative study 2. The effect of Skew angle in Composite Bridge. 3. To find out the Critical section where skew angle has to be considered for design INTRODUCTION 1.1 GENERAL Reinforced concrete slab on top of PSC girders, also come under the purview of Composite construction. But due to practical problems composite construction using a reinforced concrete slab on top of steel girders are more familiar nowadays & RDSO also insists Railways to go with reinforced concrete slab on top of steel girders in ROB areas. INTERNATIONAL JOURNAL OF CIVIL ENGINEERING AND TECHNOLOGY (IJCIET) ISSN 0976 â 6308 (Print) ISSN 0976 â 6316(Online) Volume 5, Issue 2, February (2014), pp. 88-96 © IAEME: www.iaeme.com/ijciet.asp Journal Impact Factor (2014): 3.7120 (Calculated by GISI) www.jifactor.com IJCIET ©IAEME
2.
International Journal of
Civil Engineering and Technology (IJCIET), ISSN 0976 â 6308 (Print), ISSN 0976 â 6316(Online) Volume 5, Issue 2, February (2014), pp. 88-96 © IAEME 89 Thus using a reinforced concrete slab on top of steel girders is an economical and popular form of construction for highway & in Railway bridges. It can be used over a wide range of span sizes. 1.1.1 Beam and slab construction (Composite Bridges) The form of construction considered in this publication is the beam and slab type, where a reinforced concrete deck slab sits on top of several I-section steel girders, side-by-side, and acts compositely with them in bending. It is one of the most common types of recent highway bridge in construction .A typical cross section, for a composite bridge two-lane road with footways, is shown in Figure 1.1 Figure 1.1: Typical cross section of a composite bridge two-lane road with footways Composite action is generated by shear connectors welded on the top flanges of the steel girders. The concrete slab is cast around the connectors. This effectively creates a series of parallel T-beams, side by side. The traffic runs on a non-structural wearing course on top of the slab (there is a waterproofing membrane between). The load of the traffic is distributed by bending action of the reinforced concrete deck slab, either transversely to the longitudinal beams or, in some cases, by longitudinal bending to cross-beams and thence transversely to a pair of longitudinal main beams. The steel girders can be of rolled section, for fairly short spans, or can be fabricated from plate. Figure 1.2: Composite steel girder bridge of span 32m and skew 12 degree at Singaperamolkovil Railway station near Chengalpet (work under construction) Deck slab Steel girder / PSC girder
3.
International Journal of
Civil Engineering and Technology (IJCIET), ISSN 0976 â 6308 (Print), ISSN 0976 â 6316(Online) Volume 5, Issue 2, February (2014), pp. 88-96 © IAEME 90 Greater spans can be achieved if the bridge is lightly loaded a farm access bridge or a footbridge, for example. In both the latter cases, where the beam is shallow relative to the span, considerations of deflection and/or oscillations may control the design. Very little fabrication is necessary with Universal Beams, usually only the fitting of stiffeners over support bearings and the attachment of bracing. Beams can be curved in elevation (camber) by specialist companies using heavy rolling equipment. For highway bridges where spans exceed the limits dictated by the maximum size of Universal Beams, girders must be fabricated from plates. Even for smaller spans, plate girders may be more suitable, because thicker webs and flanges can be provided. Also, Universal Beams of 762 mm serial size and above can often be more economically replaced by a similar plate girder. The use of plate girders gives scope to vary the girder sections to suit the loads carried at different positions along the bridge. A wide variety of different forms in elevation and section has developed. Figures 1.3: Composite Construction of Bridge no 1449A âbetween Samayanllur & Sholavandan in Madurai District Figure 1.4: South India longest Composite Girder Bridge. Over all span 51m.Skew 62Âș
4.
International Journal of
Civil Engineering and Technology (IJCIET), ISSN 0976 â 6308 (Print), ISSN 0976 â 6316(Online) Volume 5, Issue 2, February (2014), pp. 88-96 © IAEME 91 1.1.2 Advantages of Composite Steel Girder The composite girders have several advantages as they can reduce the use of concrete as well as steel; offer greater strength; lesser floor sections and greater speed of construction. The work involves fabrication of steel girders in reputed workshop, transportation, assembling the individual girder with splice joints, erection of âIâ girders one by one with support arrangements & diaphragms and then casting the deck slab at site. Fabrication is done in work shop and the quality can be achieved. No temporary staging and continued speed restriction required only line block is required for erection and hence all the activities can be planned independently. Light weight and therefore easy, fast and safer method of launching and mobilisation of heavier capacity cranes can be avoided resulting to very fast construction. 1.1.3 Some of the guidelines available for Composite (Steel) Construction i. These girders are welded type. ii. End diaphragm girders should be provided along the alignment of the bearing so that the entire span at one end can be lifted with help of synchronous jacks for attending bearings etc. Cross bracing should be provided square to the girder alignment. iii. All field joints of cross bracings and end diaphragms are planned with High Strength Friction Grip Bolts. iv. Stud type/ flexible shear connectors are provided. Rigid shear connectors of structural steel section welded on top flange should not be provided. v. Provision of Abutment/pier at railway boundary is not mandatory. Standard span should be planned over the railway track. Adjacent spans can also be of required standard span vi. General Arrangement Drawing (GAD) for skew crossing may be planned with skew angle in increment of 5 deg. Normally the skew angle more than 45 degree should be avoided. However any skew angle can be provided with proper design and calculation. SKEW BRIDGES 2.1 GENERAL Bridge deck slabs by its nature have their supports only at two edges and the remaining 2 edges are free. They carry traffic on top and cross an obstruction. The supports for such slabs are sometimes not orthogonal for the traffic direction necessitated by many reasons. Such bridge decks are defined as skew bridge decks. From analytical point of view, knowledge on design and behavior is limited and from practical point of view, detailing is quite involved and visibility is restricted. Several practices exist in reducing the skew effects, as there are many apprehensions (anxiety) about the correct prediction of the behavior and proper designs of the skew bridges especially if the skew angle is very high. In some cases skew effects are avoided by proper choice of orientation of supports. Foundations and substructures could be oriented in the direction of flow of river or rail track in a skew crossing. But trestle cap could be provided in such a way so that deck system forms a right deck (not a skew deck). This could also be achieved in a simple way by choosing single circular column pier as shown in figure 2.1.
5.
International Journal of
Civil Engineering and Technology (IJCIET), ISSN 0976 ISSN 0976 â 6316(Online) Volume 5, Issue 2, February (2014), pp. Figure 2.1: Skew spans converted as right span girders by placement of bed block on top of pier 2.2 Behavior of Skew Bridge Decks Normally a rectangular slab bridge and transverse direction. The principal moments are also in the traffic direction and in the normal to the traffic. The direction and the principal moment can well be recognized by the deformation pattern as shown in fig.2.2, which is reality. Figure 2.2: The slab bends longitudinally leading to a sagging moment. Hence deflection of the middle longitudinal strip will be less than the deflection of edge longitudinal strip. The middle longitudinal strip along xx is supported by adjoining strip on either side. The longitudinal strip near free edges say along x1x1 is supported by adjoining strip only on one side, the other side being a free edge. International Journal of Civil Engineering and Technology (IJCIET), ISSN 0976 6316(Online) Volume 5, Issue 2, February (2014), pp. 88-96 © IAEME 92 Skew spans converted as right span girders by placement of bed block on top of pier 2.2 Behavior of Skew Bridge Decks rectangular slab bridge deck behaves in flexure orthogonally in the longitudinal rse direction. The principal moments are also in the traffic direction and in the normal to the traffic. The direction and the principal moment can well be recognized by the deformation pattern as shown in fig.2.2, which is reality. Figure 2.2: Deflection profiles in a right deck The slab bends longitudinally leading to a sagging moment. Hence deflection of the middle longitudinal strip will be less than the deflection of edge longitudinal strip. The middle longitudinal supported by adjoining strip on either side. The longitudinal strip near free edges say is supported by adjoining strip only on one side, the other side being a free edge. International Journal of Civil Engineering and Technology (IJCIET), ISSN 0976 â 6308 (Print), Skew spans converted as right span girders by placement of bed block on top of pier deck behaves in flexure orthogonally in the longitudinal rse direction. The principal moments are also in the traffic direction and in the normal to the traffic. The direction and the principal moment can well be recognized by the deformation pattern The slab bends longitudinally leading to a sagging moment. Hence deflection of the middle longitudinal strip will be less than the deflection of edge longitudinal strip. The middle longitudinal supported by adjoining strip on either side. The longitudinal strip near free edges say is supported by adjoining strip only on one side, the other side being a free edge.
6.
International Journal of
Civil Engineering and Technology (IJCIET), ISSN 0976 â 6308 (Print), ISSN 0976 â 6316(Online) Volume 5, Issue 2, February (2014), pp. 88-96 © IAEME 93 For skew slabs the force flow is through the strip of area connecting the obtuse angled corners and the slab primarily bends along the line joining the obtuse angled corners. The width of the primary bending strip is a function of skew angle and the ratio between the skew span and the width of the deck (aspect ratio). The areas on either side of the strip do not transfer the load to the supports directly but transfer the load only to the strip as cantilever. Hence the skew slab is subjected to twisting moments. This twisting moment is not small and hence cannot be neglected. Because of this, the principal moment direction also varies and it is the function of a skew slab. The transfer of the load from the strip to support line is over a defined length along the support line from the obtuse angled corners. Then the force gets redistributed for full length. The force flow is shown in fig 2.4 (a&b). The thin lines in fig.2.4 (a) indicate deformation shape. The distribution of reaction forces along the length of the supports is also shown on both the support sides. The deflection of the slab also is not uniform and symmetrical as it is in a right deck. There will be warping leading to higher deflection near obtuse angled corner areas and less deflection near acute angled corner areas. Fig. 2.3 & 2.4 show the deformation pattern of a right slab deck and also the skew slab deck. Figure 2.3: Deflection profile in a skew deck slab
7.
International Journal of
Civil Engineering and Technology (IJCIET), ISSN 0976 ISSN 0976 â 6316(Online) Volume 5, Issue 2, February (2014), pp. Figure 2.4 Figure 2.4 (b): Force flow pattern in skew deck slab 2.3 Significant characteristics of Skew Deck with respect to Right Deck The characteristic differences in behavior of skew deck with respect to right deck are: I. High reaction at obtuse corners. II. Possible uplift at acute corners, especially in case of slab with very high skew angles. III. Negative moment along support line, high shear and high torsion near obtuse corners. IV. Sagging moments orthogonal to abutments in central region. V. At free edges, maximum moment nearer to obtuse corners rather than at center. VI. The points of maximum deflection nearer maximum deflection towards obtuse corners is more if the skew angle is more). VII. Maximum longitudinal moment and also the deflection reduce with increase of skew angle for a given aspect ratio of the skew slab. VIII. As skew increases, more reaction is thrown towards obtuse angled corners and less on the acute angled corner. Hence the distribution of reaction forces is non support line. It is generally believed that for skew angle up to 15 values and its direction is very small. The analysis considering the slab as if it is right deck with skew span as one side and right width as another side is adequate for design purposes. When skew angle increases beyond 15o , more accurate analysis is required since change in the behavior of slab is considerable. It may be understood that behavior is not only dependent on skew angle but also on aspect ratio, namely skew span to right width ratio. If the width of the slab is large, connecting the obtuse angled corner will also be large. The bending strip also will be very nearly orthogonal to supports. To reduce the twisting moment on the load obtuse angled corners, an elastic support can be given along the free ends for the slab and this support is achieved by provision of an edge beam. If stiff edge beam is provided, it acts as a line support for the slab, which effectively extends right up to the International Journal of Civil Engineering and Technology (IJCIET), ISSN 0976 6316(Online) Volume 5, Issue 2, February (2014), pp. 88-96 © IAEME 94 Figure 2.4 (a) Force flow in a skew deck (b): Force flow pattern in skew deck slab of Skew Deck with respect to Right Deck The characteristic differences in behavior of skew deck with respect to right deck are: High reaction at obtuse corners. Possible uplift at acute corners, especially in case of slab with very high skew angles. ve moment along support line, high shear and high torsion near obtuse corners. Sagging moments orthogonal to abutments in central region. At free edges, maximum moment nearer to obtuse corners rather than at center. The points of maximum deflection nearer obtuse angle corners. (This shift of point of maximum deflection towards obtuse corners is more if the skew angle is more). Maximum longitudinal moment and also the deflection reduce with increase of skew angle for a given aspect ratio of the skew slab. skew increases, more reaction is thrown towards obtuse angled corners and less on the acute angled corner. Hence the distribution of reaction forces is non- It is generally believed that for skew angle up to 15o , effect of skew on principal moment values and its direction is very small. The analysis considering the slab as if it is right deck with skew span as one side and right width as another side is adequate for design purposes. When skew accurate analysis is required since change in the behavior of slab is considerable. It may be understood that behavior is not only dependent on skew angle but also on aspect ratio, namely skew span to right width ratio. If the width of the slab is large, the cantilevering portion from the primary bending strip connecting the obtuse angled corner will also be large. The bending strip also will be very nearly orthogonal to supports. To reduce the twisting moment on the load-bearing strip connecting the e angled corners, an elastic support can be given along the free ends for the slab and this support is achieved by provision of an edge beam. If stiff edge beam is provided, it acts as a line support for the slab, which effectively extends right up to the abutment. International Journal of Civil Engineering and Technology (IJCIET), ISSN 0976 â 6308 (Print), The characteristic differences in behavior of skew deck with respect to right deck are: Possible uplift at acute corners, especially in case of slab with very high skew angles. ve moment along support line, high shear and high torsion near obtuse corners. At free edges, maximum moment nearer to obtuse corners rather than at center. obtuse angle corners. (This shift of point of maximum deflection towards obtuse corners is more if the skew angle is more). Maximum longitudinal moment and also the deflection reduce with increase of skew skew increases, more reaction is thrown towards obtuse angled corners and less on -uniform over the kew on principal moment values and its direction is very small. The analysis considering the slab as if it is right deck with skew span as one side and right width as another side is adequate for design purposes. When skew accurate analysis is required since change in the behavior of slab is considerable. It may be understood that behavior is not only dependent on skew angle but also on the cantilevering portion from the primary bending strip connecting the obtuse angled corner will also be large. The bending strip also will be very nearly bearing strip connecting the e angled corners, an elastic support can be given along the free ends for the slab and this support is achieved by provision of an edge beam. If stiff edge beam is provided, it acts as a line
8.
International Journal of
Civil Engineering and Technology (IJCIET), ISSN 0976 â 6308 (Print), ISSN 0976 â 6316(Online) Volume 5, Issue 2, February (2014), pp. 88-96 © IAEME 95 TABLE 2.1: BRIEF HISTORY OF STUDY Girder dimensions Effective span 49.20m Depth of girder 255.00cm Overall span 50.90m No. of Girders 5 Nos Spacing of girders 1.50m Overall width of deck 10.25m Footpath slab width 1.50m Wearing coat Thickness 65.00mm Carriageway width 7.50m Skew angle 00.00 Width of top flange @ centre exterior girder 77.50cm Width of top flange @ centre interior girder 56.00cm Thickness of top flange at centre for exterior girder 8.00cm Thickness of top flange at centre for interior girder 2.50cm Thickness of top flange at end for exterior girder 4.00cm Thickness of top flange at end for interior girder 2.50cm Web Width of cantilever slab 212.50cm c/c between webs (at mid span) 150.00cm Thickness of web at centre for exterior and interior 1.60cm Thickness of web at supportfor exterior and interior 1.60cm Slab c/c of expansion joint 52.61m Width of top slab/kerb 287.50cm Thickness of top slab at centre 20.00cm Thickness of top slab at expansion joint 20.00cm Width of bottom flange @ centre for exterior girder 77.50cm Width of bottom flange @ centre for interior girder 56.00cm Thickness of bottom flange at centre for exterior girder 8.00cm Thickness of bottom flange at centre for interior girder 2.50cm Thickness of bottom flange at end for exterior girder 4.00cm Thickness of bottom flange at end for interior girder 2.50cm Diaphragms Depth of diaphragms between flange 240cm c/c of diaphragm 6.40m Thickness of top & bottom flange 2.00cm Thickness of web 1.20cm Composite girder Yes INTRODUCTION TO STAAD-PRO 3.1 GENERAL This is an introduction to STAAD software, which is a structural engineering software widely used for the design of multistoreyed buildings. Abstract STAAD Pro is a comprehensive structural engineering software that addresses all aspects of structural engineering including model
9.
International Journal of
Civil Engineering and Technology (IJCIET), ISSN 0976 â 6308 (Print), ISSN 0976 â 6316(Online) Volume 5, Issue 2, February (2014), pp. 88-96 © IAEME 96 development, verification, analysis, design and review of results. It includes advanced dynamic analysis and push over analysis for wind load and earthquake load. 3.2 STRUCTURAL DESIGN AND ANALYSIS USING STAAD.PRO STAAD.Pro is a comprehensive and integrated design and finite element analysis tool. The exponential growth of the Indian as well as the global construction industry has directly impacted the demand for structural engineers. It has become important for civil design engineers to be well equipped with the structural software like STAAD.Pro, since most of the companies are using STAAD as a tool for designing massive structures, it is imperative that professionals should get trained in this field too to gain advantage in the highly competitive construction market. Itâs a known fact that computers reduce man hours required to complete a project, and knowledge of STAAD will ensure fast and efficient planning as well as accurate execution. Significance of STAAD.Pro i. Fast and gives accurate results. ii. Accurate and quick production of plans for massive constructions iii. Reduces cost and saves labor. iv. STAAD is the base for structural design and analysis for any construction company. REFERENCES 1. âComposite construction in ROBâs âpresent scenarioâ, G. Radhakrishnan (SSE/Bridges/MDU) Southern Railway Civil Engg News Digest Apri l2012. 2. âQuality control in fabrication of composite girdersâ, G. Radhakrishnan (SSE/Bridges/MDU) Southern Railway Civil Engg News digest September 2012. 3. âComparative study of prestressed steel-concrete composite bridge of different span length and girder spacingâ, Vikash khatri, Pramod Kumar Singh and P. R. Maiti International Journal of Modern Engineering Research Vol.2, Issue 5, Sept-Oct 2012. 4. âInfluence of skew angle on continous composite girder bridgeâ, Gholamreza Nouri & Zahed Ahmadi. American Society of Civil Engineers. 5. âDevelopment of an innovative connector system for fiber-reinforced polymer bridge decks to steel stringersâ, Julio F. Davalos & Karl E. Barth. NCHRP-IDEA Project 66. 6. âLong-term stress of simply supported steel-concrete composite beamsâ, Min Ding, Xiugen Jiang, Zichen Lin & Jinsan Ju. The open construction and building technology journal, 2011, 5, 1-7. 7. Indian Railway standard âConcrete Bridge code. 8. Indian Railway standard-Substructure & foundation code. 9. âPresentation on Skew Slabs & Girder Bridgesâ, Prof. N. Rajagopalan (Retd. Professor & Dean, I.I.T. Chennai) Chief Technical Advisor â Bridges & Structures M/s. L&T- RAMBĂLL Consulting Engineers Limited, Chennai. 10. Patil Yashavant S. and Prof. Shinde Sangita B., âComparative Analysis and Design of Box Girder Bridge Sub-Structure with Two Different Codesâ, International Journal of Advanced Research in Engineering & Technology (IJARET), Volume 4, Issue 5, 2013, pp. 134 - 139, ISSN Print: 0976-6480, ISSN Online: 0976-6499. 11. Patil Yashavant S. and Prof.Shinde Sangita B., âComparative Analysis of Box Girder Bridge with Two Different Codesâ, International Journal of Civil Engineering & Technology (IJCIET), Volume 4, Issue 3, 2013, pp. 111 - 120, ISSN Print: 0976 â 6308, ISSN Online: 0976 â 6316.
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