Download - Overpass Design at Vellore
-
8/2/2019 Overpass Design at Vellore
1/23
Improvement of AccessRoad to Vellore city
Over Pass construction
By
Aravindh Prasanth
Karthickeyan .S
Karumanchi Ashok
Prabakaran M
-
8/2/2019 Overpass Design at Vellore
2/23
Problem Identification
City road of 6m width connects NH-234 with vellorecity. The length of the road is 0.7 km.
The Road is congested due to traffic generated byCMC college and Hospital as well residential areas .
We have identified that during peak hours ie.4 pm to8 pm the road is becoming inaccessible .
Thousands of patients coming to the CMC hospitalfacing so many problems with traffic, and if it is anemergency case means no body can assure theirlife.
-
8/2/2019 Overpass Design at Vellore
3/23
OBJECTIVE
To review of previous studies and plans relatedto the project, analysis of most effective andefficient roads development of the project.
To carry out necessary engineering surveys. To complete a detailed design for execution of
the project.
To carry out construction planning and cost
estimate. To prepare a draft tender documents for
execution of the project
-
8/2/2019 Overpass Design at Vellore
4/23
Location
Vellore NH234 near CMC hospital
-
8/2/2019 Overpass Design at Vellore
5/23
-
8/2/2019 Overpass Design at Vellore
6/23
Methodology1. Preliminary study
1.1. To review the feasibility study conducted by DGH andother related information
1.2. To conduct supplementary present condition survey
2. Natural Condition Surveys
2.1. Topographic survey2.2. Geotechnical survey
2.3. Hydrological survey
3. Traffic Survey
3.1. To examine existing traffic data and analyze thepresent and future traffic flow
3.2. To carry out an additional traffic survey
-
8/2/2019 Overpass Design at Vellore
7/23
Methodology
4. Conduct of the Basic Design of the projects
5. Conduct of the Detailed Design6. Conduct of the Construction Plan
7. Preparation of Draft Tender Documents
8. Preparation on Environmental Management Plan (UKL)
and Environmental Monitoring Plan (UPL) during theconstruction period
9. Preparation of the Right-of-Way Acquisition Plan
10.Overall Evaluation and Recommendation
-
8/2/2019 Overpass Design at Vellore
8/23
W.C
All Dimensions are in mm
Kerb
Cantilever slab Inner slab
-
8/2/2019 Overpass Design at Vellore
9/23
IRC STANDARD LIVE LOADS
Live loads are those caused by vehicles,which pass overthe bridge and are transient in nature. These loadscannot be estimated precisely,and the designer has verylittle control over them once the bridge is opened totraffic. However hypothetical loadings, which are
reasonably realistic need to be evolved and specified toserve as design criteria.
IRC CLASS AA LOADING : This loading consists ofeither a tracked vehicle of 700 KN or a wheeled vehicle
of 400 KN with dimension s as shown in fig.
-
8/2/2019 Overpass Design at Vellore
10/23
IRC CLASS AA Loading
-
8/2/2019 Overpass Design at Vellore
11/23
IRC Class 70R loading
In recent years, there is an increasing tendency tospecify this loading in place of Class AA loading.Thisloading consists of a tracked load of 1000KN. Thetracked vehicle is similar to the Class except that the
contact length of the track is 4.57 m, the nose tail thelength of the vehicle is 7.92 m and the specifiedminimum spacing between the successive vehicles is30m.
-
8/2/2019 Overpass Design at Vellore
12/23
IRC Class 70R loading
-
8/2/2019 Overpass Design at Vellore
13/23
IRC Class A and B loading
Class A loading consists of a wheel load traingcomposed of a driving vehicle and trailers of specifiedaxle apcing and laods,as shown in fig.
-
8/2/2019 Overpass Design at Vellore
14/23
IRC Class A and B loading
-
8/2/2019 Overpass Design at Vellore
15/23
Impact Effect
Live load train produce higher stresses than those whichwould be caused if the loading vehicles were stationary.
In order to take into account the increase in stresses dueto dynamic action and still proceed with simpler
statistical analysis, an impact allowance is made. For I.R.C Class A loading
I = A/(B+L)Where I = Impact factor fractionA = Constant value for 4.5 for R.C. Bridge and 9.0 for
Steel bridgesB = Constant value 6 Reinforced concrete bridgesL = Span in meters.
-
8/2/2019 Overpass Design at Vellore
16/23
Factors
Impact factor for Class A loading = 4.5/(6+2.76)=0.513
Max impact factor for class A loading is 0.5
Impcat factor for Class AA loading is 25%
-
8/2/2019 Overpass Design at Vellore
17/23
Specifications
Clear width of the carriage way = 7.5m
c/c between beams of longitudinal girders =20m
Class AA tracked loading (or) 70R tracked loading (or)
class A wheel load which ever produce severe condition. M25 grade concrete is used and Fe415 steel is used.
-
8/2/2019 Overpass Design at Vellore
18/23
Design of Cantilever slab
Component D.L per m(KN)
Distance ofC.G from
the edge ofthe girder
Moment(KN-M)
Parapet 0.5 1.19 0.525
Kerb 1.478 1.04 3.328
W.C 1.478 0.42 0.621
Slab (rect) 3.72 062 2.306
Slab(Triangle)
2.17 0.413 0.896
Total 7.746
Dead Loads
-
8/2/2019 Overpass Design at Vellore
19/23
57KN
-
8/2/2019 Overpass Design at Vellore
20/23
Reinforcement details
Cantilever slab
Provide 16mm dia bars @ 200mm c/c
Provide 8mm dia bars@ 170mm c/c as distribution bars
Inner slabs 16mm dia bars@ 220mm c/c both top and bottom along
the breadth.
12mm dia bars@ 220mm c/c in longitudinal direction
both at top and bottom.
R i f d il f i d
-
8/2/2019 Overpass Design at Vellore
21/23
Reinforcement details of outer girders
Provide 10 nos 34mm dia bar and 6 nos 25mm dia bars Provide in 4 layers
-
8/2/2019 Overpass Design at Vellore
22/23
1 From edge to 4.18m 10mm dia 2 leggedstirrups@160
mm c/c
2 From 4.18m to 5.225m 10mm dia 2 legged
stirrups@240
mm c/c
3 From 5.225 to 7.5m 12mm dia 2 legged
stirrups@180
mm c/c
4 From 7.5 to 8.108m 12mm dia 2 leggedstirrups@200
mm c/c
5 From 8.1 to 10m 12mm dia 2 legged
stirrups@300
mm c/c
-
8/2/2019 Overpass Design at Vellore
23/23
Referred books and code books
IRC:86-1983 Geometric design standards for urbanroads .
Traffic engineering and transport planning by
L.R .Kadiyali IRC loading class.