DESIGN & ANALYSIS OF DECK SLAB BRIDGE

PRESENTED BY:PRESENTED BY:ANIMESHANIMESH

Purpose Of BridgePurpose Of BridgeA bridge is a structure providing A bridge is a structure providing passage over an obstacle without closing passage over an obstacle without closing the way beneath.the way beneath.The required passage may be for a The required passage may be for a road, a railway, pedestrians, a canal or a road, a railway, pedestrians, a canal or a pipeline. pipeline. The obstacle to be crossed may be a The obstacle to be crossed may be a river, a road, railway or a valley.river, a road, railway or a valley.

Components of Components of Bridge StructureBridge Structure

PLANNING FOR PLANNING FOR BRIDGEBRIDGE

DATA COLLECTIONDATA COLLECTIONLocation of bridge site.Location of bridge site.Transportation of bridge site.Transportation of bridge site.Nature of crossing and affordability.Nature of crossing and affordability.Availability of local material.Availability of local material.Traffic volume.Traffic volume.Availability of local bridge builders.Availability of local bridge builders.Temporary crossing.Temporary crossing.Local participation.Local participation.

ANALYSIS OF DATAANALYSIS OF DATA

SHORTEST DISTANCE SHORTEST DISTANCE FOR THE BRIDGEFOR THE BRIDGE

To construct a bridge the first part of To construct a bridge the first part of analysis is to decide the shortest route analysis is to decide the shortest route for the bridge from starting point to the for the bridge from starting point to the end point. & whether it is necessary & end point. & whether it is necessary & economical to construct a bridge. In this economical to construct a bridge. In this part of analysis, curves ends of river are part of analysis, curves ends of river are excluded so as the distance will excluded so as the distance will decrease between the ends of bridge decrease between the ends of bridge unless there is no other plan is possible unless there is no other plan is possible for the bridge.for the bridge.

ECONOMICAL SPANECONOMICAL SPAN Economic Economic Span Depend Span Depend Upon The Upon The Cost Of:Cost Of:SubstructureSubstructureSuperstructurSuperstructuree

SCOUR DEPTHSCOUR DEPTH

Depth of scour Depth of scour below the High below the High Flood LevelFlood LevelScour depth has Scour depth has importance in importance in determination of determination of depth of foundationdepth of foundationIf mean score depth If mean score depth is ‘d’, then max is ‘d’, then max scour depth for piers scour depth for piers is ‘2d’is ‘2d’

The depth which is produced due to the scouring The depth which is produced due to the scouring action of water.action of water.

VERTICAL VERTICAL CLEARANCECLEARANCE

Minimum vertical clearance Minimum vertical clearance of 5m should be ensure over of 5m should be ensure over the full width of roadway.the full width of roadway.

The vertical clearance The vertical clearance should be measured with should be measured with regard to the highest point of regard to the highest point of carriageway.carriageway.

Allowance for any future Allowance for any future raising of pavement is also be raising of pavement is also be made. made.

TRAFFIC PROJECTIONTRAFFIC PROJECTION Analysis of traffic is also Analysis of traffic is also necessary for the bridge necessary for the bridge designing. Traffic projection designing. Traffic projection defines the amount of traffic defines the amount of traffic passing through the bridge. passing through the bridge. This helps in estimating the This helps in estimating the type of loading. Sometimes in type of loading. Sometimes in case of emergency the case of emergency the amount of traffic increases so amount of traffic increases so that a sufficient space is that a sufficient space is provided for the vehicles to provided for the vehicles to go through the bridge without go through the bridge without facing any problems.facing any problems.

SELECTION OF SELECTION OF BRIDGE TYPEBRIDGE TYPE

•Geometric condition of the site(road alignment, design flood and Geometric condition of the site(road alignment, design flood and highest water mark)highest water mark)•Traffic capacity.Traffic capacity.•Structural stability.Structural stability.•Foundation conditions and strength of a abutment.Foundation conditions and strength of a abutment.•Available material.Available material.•Knowledge and equipment of the contractor.Knowledge and equipment of the contractor.•Clearance requirement above and below the road way.Clearance requirement above and below the road way.•General requirements with respect to location ,financing and General requirements with respect to location ,financing and community values.community values.

What is deck slab What is deck slab bridge?bridge?

•A bridge with an upper horizontal beams that A bridge with an upper horizontal beams that carries Roadway or Railway is known as ‘Deck’ carries Roadway or Railway is known as ‘Deck’ of the Bridge.of the Bridge.

•In Deck Slab Bridges, the deck itself is the In Deck Slab Bridges, the deck itself is the structural frame or the entire deck is thin beam structural frame or the entire deck is thin beam acting entirely as one primary member. These acting entirely as one primary member. These types are used where the depth of structure is types are used where the depth of structure is critical factor.critical factor.

•A slab deck is one where the deck is analyzed A slab deck is one where the deck is analyzed as a plate. If the slab has the different stiffness as a plate. If the slab has the different stiffness in two directions right angle to each other, the in two directions right angle to each other, the bridge is analyzed as the orthotropic deck and bridge is analyzed as the orthotropic deck and the bridge is known to be the Deck Slab Bridge.the bridge is known to be the Deck Slab Bridge.

Deck slab bridgeDeck slab bridge

BRIDGES- BRIDGES- STRUCTURAL DESIGNSTRUCTURAL DESIGN

Dead loadsDead loads Centrifugal ForcesCentrifugal Forces

Live LoadsLive Loads Live Load SurchargeLive Load Surcharge

Snow LoadsSnow Loads BuoyancyBuoyancy

Impact & dynamic LoadsImpact & dynamic Loads Temperature EffectsTemperature Effects

Earth PressureEarth Pressure Deformation EffectsDeformation Effects

Vehicle Collision LoadsVehicle Collision Loads Secondary EffectsSecondary Effects

Wind LoadsWind Loads Seismic forcesSeismic forces

Impact Due to Floating Impact Due to Floating BodiesBodies

Wave PressureWave Pressure

Water CurrentsWater Currents Grade EffectsGrade Effects

THANK YOUTHANK YOU

TO BE CONTINUED…TO BE CONTINUED…