The document discusses stress ribbon bridges, which are a type of suspension bridge where cables are embedded in the deck below the walking surface. Stress ribbon bridges follow a catenary profile and transmit loads via tension in the sagging deck to anchored abutments. The document outlines the history, form, construction techniques, applications, advantages, and recent advances of stress ribbon bridges. Stress ribbon bridges are economically efficient, aesthetically pleasing, require minimal maintenance, and can be erected without falsework.
A stressed ribbon bridge (also stress-ribbon bridge or catenary bridge) is a tension structure (similar in many ways to a simple suspension bridge). The suspension cables are embedded in the deck which follows a catenary arc between supports. Unlike the simple span, the ribbon is stressed in traction, which adds to the stiffness of the structure (simple suspension spans tend to sway and bounce).
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Suspension bridges are suspended from cables. The earliest suspension bridges were made of ropes or vines covered with pieces of bamboo. In modern bridges, the cables hang from towers that are attached to caissons or cofferdams. The caissons or cofferdams are implanted deep into the bed of the lake, river or sea. Sub-types include the simple suspension bridge, the stressed ribbon bridge, the underspanned suspension bridge, the suspended-deck suspension bridge, and the self-anchored suspension bridge. There is also what is sometimes called a "semi-suspension" bridge, of which the Ferry Bridge in Burton-upon-Trent is the only one of its kind in Europe.[19]
The longest suspension bridge in the world is the 3,909 m (12,825 ft) Akashi Kaikyō Bridge in Japan.
A Stress Ribbon Bridge is a tension structure (similar in many ways to a simple suspension bridge). The suspension cables are embedded in the deck which follows a catenary arc between supports.
A stressed ribbon bridge (also stress-ribbon bridge or catenary bridge) is a tension structure (similar in many ways to a simple suspension bridge). The suspension cables are embedded in the deck which follows a catenary arc between supports. Unlike the simple span, the ribbon is stressed in traction, which adds to the stiffness of the structure (simple suspension spans tend to sway and bounce).
what is a ribbon bridge
stress ribbon pedestrian bridges
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bridge materials for sale
materials used to build bridges
used bridge
material used in construction
interesting civil engineering topics
civil engineering topics for presentation
seminar topics pdf
best seminar topics for civil engineering
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Suspension bridges are suspended from cables. The earliest suspension bridges were made of ropes or vines covered with pieces of bamboo. In modern bridges, the cables hang from towers that are attached to caissons or cofferdams. The caissons or cofferdams are implanted deep into the bed of the lake, river or sea. Sub-types include the simple suspension bridge, the stressed ribbon bridge, the underspanned suspension bridge, the suspended-deck suspension bridge, and the self-anchored suspension bridge. There is also what is sometimes called a "semi-suspension" bridge, of which the Ferry Bridge in Burton-upon-Trent is the only one of its kind in Europe.[19]
The longest suspension bridge in the world is the 3,909 m (12,825 ft) Akashi Kaikyō Bridge in Japan.
A Stress Ribbon Bridge is a tension structure (similar in many ways to a simple suspension bridge). The suspension cables are embedded in the deck which follows a catenary arc between supports.
Regarding basics of prestressed such as inventor, types of prestressing systems, methods of prestressing, types of grouting, types of cables used for prestressed structure and method of construction etc..
Workshop under the Capacity Building Programme of the Southern Road Connectivity Project / Expressway Connectivity Improvement Plan Project, March 2016
Shear, bond bearing,camber & deflection in prestressed concreteMAHFUZUR RAHMAN
This Presentation was presented as a partial fulfillment of Prestressed Concrete Design Lab Course. Behavior & Design of Prestress on above topic is shortly discussed on the presentation. The part "Shear & Shear Design in Prestressed" Concrete was prepared by me. Other topics were prepared by other members of my group. Thanks to all my teachers & friends who helped us in different stages during preparation of the total presentation.
The vacuum dewatering process basically improves strength, durability, and other properties of concrete by reducing the water-cement ratio immediately after the mix is placed, usually in floors and other flatwork. A Bridgeport, Connecticut vacuum dewatering demonstration, although it involved no new ...
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what is polymer concrete, types, properties, material used in manufacturing process , manufacturing process, applications and their advantages. case study on polymer composite concrete.
Regarding basics of prestressed such as inventor, types of prestressing systems, methods of prestressing, types of grouting, types of cables used for prestressed structure and method of construction etc..
Workshop under the Capacity Building Programme of the Southern Road Connectivity Project / Expressway Connectivity Improvement Plan Project, March 2016
Shear, bond bearing,camber & deflection in prestressed concreteMAHFUZUR RAHMAN
This Presentation was presented as a partial fulfillment of Prestressed Concrete Design Lab Course. Behavior & Design of Prestress on above topic is shortly discussed on the presentation. The part "Shear & Shear Design in Prestressed" Concrete was prepared by me. Other topics were prepared by other members of my group. Thanks to all my teachers & friends who helped us in different stages during preparation of the total presentation.
The vacuum dewatering process basically improves strength, durability, and other properties of concrete by reducing the water-cement ratio immediately after the mix is placed, usually in floors and other flatwork. A Bridgeport, Connecticut vacuum dewatering demonstration, although it involved no new ...
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what is polymer concrete, types, properties, material used in manufacturing process , manufacturing process, applications and their advantages. case study on polymer composite concrete.
A bridge is the key element in a transportation system; it controls both the volume and weight of the traffic. Balance must be achieved between handling future traffic volume and loads and the cost of heavier and wider bridge structure. Economic Analysis and comparisons against competing alternatives is required as Bridges are the most expensive part of a road transportation network. Monetized & Non-Monetized Benefits that will accrue like time savings to road users, benefits to business activities (and to the economy in general) and salvage value benefits like Right-of-Way and substructure use need to be assessed as well.
well foundation of six lane new ganga bridge near kacchi dargah in district P...Arman Hashmi
WELL FOUNDATION PPT, well foundation of six lane new ganga bridge near kacchi dargah in district Patna on NH-30 to near Bidupur in vishali district on NH-103 from bihar state road developement corporation limited
Running Head BRIDGE DESIGN1BRIDGE DESIGN31.docxtoddr4
Running Head: BRIDGE DESIGN 1
BRIDGE DESIGN 31
Title:
Student Name:
Institution:
Course:
Date:
BRIDGE DESIGN FOR THE MOTOR WAY BELOW
8m
Embankment
A
Motorway
16m
10m
Central Reservation
Motorway
16m
Grass Verge
Existing Factory Units
Footway
A
Carriagewaym
Existing Factory Units
Fixed Factory Entrance
Fixed Factory Entrance
3m
2m
3m
2m
10mm
Existing Highway to Proposed Bridge
Existing Development
Proposed Development
Existing Development
Existing Retaining Wall – 500mm thick rc construction indicated by old record drawings
Central Reservation
10m
10m
Section A-A
2m footway
1.2m high parapets
10m carriageway
Bridge Deck Section
Figure 1
Bridge design
Most suitable bridge forms
· Beam bridge
· Arch bridge
The beam bridge: Beam and slab with ladder decks
This form of bridges comprises of slab which sits on top of steel I-beams. This form is mostly used for mid span highway bridge which is where our required bridge falls in.
Slab in this system is supported on tow main girders with a spacing of about 3.5m and it lies longitudinally between the girders as per the below diagram.
Figure 1
The bridge will use plate girders giving us a scope to vary the flange and web sizes to fit and suit the bridge load carrying capabilities. In the design process, ability of the bridge to carry the maximum load expected and the loading at the various stages of construction will guide on the proportion of girders that is their depth, width of tension and compression flanges and web thickness.
The girders are erected firmly on the ground and have stud connectors welded on the top flange to provide composite action between the slab and girder. The number of studs and spacing vary depending on expected level of shear flow between steel girder and concrete slab.
The girders rest on bearings fastened to the bottom flange. The girders are stiffened to carry the bearing loads at these points. Some cases apply bracing between the girders at support to carry lateral forces and provide torsional restraint.
Bridge description
· The bridge will have a span of 50m.
· The bridge will be raised to a height of 10m on both sides to be in level with the existing highway. The girders will have constant height.
· The bridge cross section will have the reinforced concrete slab sitting on top of two main abutment substructures and an extra substructure which will be on the central reservation. The main substructure will be located at the embarkment of the road.
Construction sequence
Abutment substructure construction
Girder construction
The bridge will consist of two main girder I beams. The girders will be of the same height. To make the I-beam, steel plates will be used. The steel plate is cut into the required sizes for the bottom flange and top flange and for the web. The cut pieces are then fillet welded into the I-section. This is done either by machine manual assembling in jig or through improved pressing machine .
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CW RADAR, FMCW RADAR, FMCW ALTIMETER, AND THEIR PARAMETERSveerababupersonal22
It consists of cw radar and fmcw radar ,range measurement,if amplifier and fmcw altimeterThe CW radar operates using continuous wave transmission, while the FMCW radar employs frequency-modulated continuous wave technology. Range measurement is a crucial aspect of radar systems, providing information about the distance to a target. The IF amplifier plays a key role in signal processing, amplifying intermediate frequency signals for further analysis. The FMCW altimeter utilizes frequency-modulated continuous wave technology to accurately measure altitude above a reference point.
We have compiled the most important slides from each speaker's presentation. This year’s compilation, available for free, captures the key insights and contributions shared during the DfMAy 2024 conference.
Overview of the fundamental roles in Hydropower generation and the components involved in wider Electrical Engineering.
This paper presents the design and construction of hydroelectric dams from the hydrologist’s survey of the valley before construction, all aspects and involved disciplines, fluid dynamics, structural engineering, generation and mains frequency regulation to the very transmission of power through the network in the United Kingdom.
Author: Robbie Edward Sayers
Collaborators and co editors: Charlie Sims and Connor Healey.
(C) 2024 Robbie E. Sayers
Cosmetic shop management system project report.pdfKamal Acharya
Buying new cosmetic products is difficult. It can even be scary for those who have sensitive skin and are prone to skin trouble. The information needed to alleviate this problem is on the back of each product, but it's thought to interpret those ingredient lists unless you have a background in chemistry.
Instead of buying and hoping for the best, we can use data science to help us predict which products may be good fits for us. It includes various function programs to do the above mentioned tasks.
Data file handling has been effectively used in the program.
The automated cosmetic shop management system should deal with the automation of general workflow and administration process of the shop. The main processes of the system focus on customer's request where the system is able to search the most appropriate products and deliver it to the customers. It should help the employees to quickly identify the list of cosmetic product that have reached the minimum quantity and also keep a track of expired date for each cosmetic product. It should help the employees to find the rack number in which the product is placed.It is also Faster and more efficient way.
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Our project explains about the student management. This project mainly explains the various actions related to student details. This project shows some ease in adding, editing and deleting the student details. It also provides a less time consuming process for viewing, adding, editing and deleting the marks of the students.
Welcome to WIPAC Monthly the magazine brought to you by the LinkedIn Group Water Industry Process Automation & Control.
In this month's edition, along with this month's industry news to celebrate the 13 years since the group was created we have articles including
A case study of the used of Advanced Process Control at the Wastewater Treatment works at Lleida in Spain
A look back on an article on smart wastewater networks in order to see how the industry has measured up in the interim around the adoption of Digital Transformation in the Water Industry.
Immunizing Image Classifiers Against Localized Adversary Attacksgerogepatton
This paper addresses the vulnerability of deep learning models, particularly convolutional neural networks
(CNN)s, to adversarial attacks and presents a proactive training technique designed to counter them. We
introduce a novel volumization algorithm, which transforms 2D images into 3D volumetric representations.
When combined with 3D convolution and deep curriculum learning optimization (CLO), itsignificantly improves
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2. OVERVIEW
• Introduction
• Form of a stress ribbon bridge
• Construction techniques
• Modified stress ribbon bridge
• Advantages
• Applications
• Recent advances
• Conclusion
• References
2SEMINAR ON STRESS RIBBON BRIDGE
3. Introduction
What is stress ribbon bridge?
Special type of suspension bridge where in the cables are
embedded in the deck just below the walking surface.
Bridge follows a catenary (funicular) profile and sags
between supports.
3SEMINAR ON STRESS RIBBON BRIDGE
Catenary profile of a stress ribbon bridge
4. Introduction(Contd.)
Uses the theory of a catenary transmitting loads via tension in the deck to
abutments which are anchored to the ground.
Concept was first introduced by a German engineer Ulrich Finsterwalder.
Prestressing the deck segments stiffens the structure, providing stability to
the cables.
The first stress ribbon bridge was constructed in Switzerland in the
1960s.
The new bridge at Lake Hodges is the sixth ribbon bridge in North
America, with three equal spans of 330 feet is the longest of this type.
SEMINAR ON STRESS RIBBON BRIDGE 4
5. SEMINAR ON STRESS RIBBON BRIDGE 5
Stress ribbon bridge: Modern analogy of ROPE BRIDGE
6. Finsterwalder’s Stress Ribbon
Bridge Theory :
Stress ribbon bridge combines a suspended concave span
(radius= 8200ft) and a supported convex span (radius
9800ft,based on design speed of bridge).
The stress ribbon itself is a reinforced concrete slab
(thickness=25.4cm).
Reinforcement consists of three to four layers of 1 inch (2.5cm) to
1 ¼ inch (1.2cm) diameter, high strength steel.
Layers are spaced so that the prestressing pipe sleeve
couplings can be used as spacers both vertically and horizontally.
SEMINAR ON STRESS RIBBON BRIDGE 6
7. SEMINAR ON STRESS RIBBON BRIDGE 7
To resist bending moments from traffic, the slab is heavily
reinforced at the top and bottom in the transverse direction.
The high strength steel tendons are stressed piece by piece
during erection to produce the desired upward deflection .
A temporary catwalk is provided to stress the first tendons.
Concrete is placed from the middle of the freely hanging 63
suspended concave part and continues without interruption to
the supports .
8. Form of a Stress Ribbon Bridge
SEMINAR ON STRESS RIBBON BRIDGE 8
Form of a stress ribbon bridge
9. Superstructure
1. Stress ribbon bridge deck consists of precast concrete planks with bearing
tendons to support them during construction and separate prestressing
tendons which are tensioned to create the final designed geometric form.
2. The prestressing tendons transfer horizontal forces in to the abutments
and then to the ground most often using ground anchors.
Substructure
1. The abutments are designed to transfer the horizontal forces from the
deck cables into the ground via ground anchors.
2. The ground anchors are normally tensioned in 2 stages, the first step is
tensioned before the deck is erected and the rest, after the deck is complete.
3. The soil pressure, overturnings and sliding has to be checked for
construction.
SEMINAR ON STRESS RIBBON BRIDGE 9
10. Ground Conditions
1. The ideal ground condition for resisting large horizontal forces from the
ribbon is a rock base.
2. In some cases where soil conditions do not permit the use of anchors,
piles can also be used.
3. Battered micropiling is another alternative which can resist the load from
the ribbon because of its compression and tension capacity.
SEMINAR ON STRESS RIBBON BRIDGE 10
deck Lake Hodges Bridge, USA
11. Construction Techniques
• Abutments and piers are built.
• Bearing cables are stretched from abutment to abutment and
draped over steel saddles that rested atop the piers.
• Precast panels are suspended via support rods located at the four
corners of each panel. At this point the bridge sagged into its
catenary shape.
• Post tensioning ducts are placed directly above the bearing cables
and support rods .
• The cast-in place concrete was placed and is allowed to harden
before the final tensioning is carried out.
SEMINAR ON STRESS RIBBON BRIDGE 11
12. • Once the concrete is cured and achieved its full strength, the bridge
is post tensioned.
• The post tensioning lifts each span, closes the gap between the
panels, puts the entire bridge in to compression and transforms the
bridge in to continuous ribbon of prestressed concrete.
SEMINAR ON STRESS RIBBON BRIDGE 12
Construction Techniques(Contd.)
13. Modified stress ribbon bridges
Stress ribbon bridges stiffened by arches
SEMINAR ON STRESS RIBBON BRIDGE 13
14. Modified stress ribbon bridges(Contd.)
Stress ribbon bridges suspended on arches
SEMINAR ON STRESS RIBBON BRIDGE 14
15. Static loading test
• 1.Vehicles were placed on the entire length of the
bridge
• 2.Vehicles placed on each span
• During the test only the deformations in the middle
of the spans and the horizontal displacements of all
supports were measured
» Prague troja bridge ,Czech Republic
SEMINAR ON STRESS RIBBON BRIDGE 15
16. Comparison with simple suspension bridge
• Similar in many ways to simple suspension bridge
• But the suspension cables are embedded in the deck
slab
• In suspension bridge cables carry the load, but in
stress ribbon bridges the highly stiffened deck
shares the axial tension
• Comparing to simple suspension bridges,both sway
and bounce are less in stress ribbon bridges
SEMINAR ON STRESS RIBBON BRIDGE 16
17. Advantages
• Stress ribbon pedestrian bridges are very economical,
aesthetical
• Minimal environmental and visual impact
• Can be erected without falsework or shoring
• Minimal long-term maintenance is required
• Are highly desirable at places as shown below:
SEMINAR ON STRESS RIBBON BRIDGE 17
21. Conclusion
• Stress ribbon bridges are a versatile form of bridge.
• Slender decks are visually pleasing and have a visual
impact on surroundings giving a light aesthetic
impression.
• Post tensioned concrete minimises cracking and
assures durability.
• Bearings and expansion joints are rarely required
minimising maintenance and inspections.
SEMINAR ON STRESS RIBBON BRIDGE 21
22. References
• Roma Agrawal, (2009), Stress ribbon bridges, The structural
engineer, pp 22-27
• Tomas Kulhavy, (1998), Stress ribbon bridges stiffened by arches or
cables, 2nd Int’l phd symposium in civil engineering, Budapest.
• Tony Sanchez, (2010), Path to safety, ASCE journal, pp 68-76.
• Stress Ribbon Bridges: Mechanics of the Stress Ribbon on the
Saddle Arndt Goldack1; Mike Schlaich2; and Moritz Meiselbach
• . Preliminary design of prestressed concrete stress Ribbon bridge
By Diego Cobo del Arco,1 A´ ngel . Aparicio,2 and Antonio R. Marı´,3
Member, ASCE
SEMINAR ON STRESS RIBBON BRIDGE 22