This design example focuses on the analysis and design of a tapered cantilever retaining wall including a comparison with model results from the engineering software programs spwall and spmats. Counterfort retaining wall gandhinagar institute of technology. Ce 537, spring 2011 retaining wall design example 1 8 design a reinforced concrete retaining wall for the following conditions. Dec 05, 2018 asdip retain is a structural engineering software for the design of retaining walls.
The following parameters influence the design of the retaining wall. Reliability analysis of counterfort retaining walls electronic. Jun 21, 2018 counterfort retaining wall design example using asdip retain duration. Design of retaining wall with counterfort engineering. A counterfort retaining wall is a cantilever wall with counterforts, or buttresses, attached to the inside face of the wall to further resist lateral thrust. Basics of retaining wall design 10 editionth a design guide for earth retaining structures contents at a glance.
Sep 20, 2017 design of retaining wall with counterfort according to aci 318 08 retaining structures hold back soil or other loose material where an abrupt change in ground elevation occurs. Oct 25, 2016 counterfort retaining wall gandhinagar institute of technology. Design steps and procedure of counterfort retaining wall is explained in this video. After this present you will be able to do the completecomplete design design andand detailingdetailing ofof differentdifferent typestypes ofof. The wall stem is 16 wide to accommodate mounting a type 7 bridge rail to the top of wall. Reinforced concrete cantilever retaining wall analysis and. The prefabricated concrete counterfort retaining wall s design strength moment and shear surpassed that of the existing system with an overall reduction in concrete volume of 57%. The prefabricated concrete counterfort retaining walls design strength moment and shear surpassed that of the existing system with an overall reduction in concrete volume of 57%. Worked example to accompany mbie guidance on the seismic design of retaining structures for residential sites in greater christchurch version 2 november 2014.
Retaining counterfort wall design bending deep foundation. Pdf black hole algorithm for sustainable design of. Cantilever retaining wall ouestion for the retaining wall and the profile shown below, calculate. Gravity walls are the earliest known retaining structures. Counterfort wall concrete design eurocode standards.
Reinforced concrete wall design basics mike oshea, p. As an example, consider the retaining wall shown below, which. Within these groups many common variations exist, for example cantilever walls may have additional supporting ties into the retained material. Counterfort retaining wall spreadsheet welcome to sefp. The retaining wall is fixed to the reinforced concrete slab. Design principles of totally prefabricated counterfort. Analysis and design of a retaining wall download project. A counterfort retaining wall is generally a catilever wall with additional support, often in the form of a cable or anchor acting as a brace at specified intervals home building and carpentry. Asdip retain is a structural engineering software for the design of retaining walls. The following section presents the formulation reliability index or probability of failure vs. This type of wall is economical to a height of about 8 m 25 ft. Counterfort retaining wall architecture britannica. Thickness of heel slab and stem 5% of height of wall. Most common materials used for retaining walls are.
Design and detailing of retaining walls learning outcomes. Structural design of cantilever retaining wall is depend on separating each part of wall and design it as a cantilever, so its called cantilever r. Design of cantilever and counterfort retaining walls pdf. The walls must resist the lateral pressures generated by loose soils or, in some cases, water pressures. The optimization of the cost and co 2 emissions in earth retaining walls is of relevance, since these structures are often used in civil engineering. Worked example 2 design of concrete cantilever retaining. Analysis and design of a retaining wall chapter one introduction retaining walls cantilever rw rankin theory forces on cantilever rw counterfort rw forces on counterfort rw the gravity rw forces on gravity rw chapter two stability of retaining wall soil properties of rws drainage in rw allowable bearing capacity chapter three procedure for the. The load that presents the greatest problem and its primary concern is the lateral earth pressure induced by the retained soil. Aci 318 08 design of retaining wall with counterfort. This document is a stepbystep design example of a typical counterfort retaining wall using asdip retain. Design principles of totally prefabricated counterfort retaining wall system compared with existing castin.
Within these groups many common variations exist, for example cantilever walls may have additional supporting ties into. Design and analysis of configurations and loading conditions make it easy and increase productivity. These dimensions are only a guide, and thinner walls of 1015 cm thick sections may be used if structural stability is satisfied. Pdf analysis of counterfort retaining wall with and without. As a second example, a fully precast concrete bridge was constructed. Cantilever retaining walls can be precast in a factory or formed on site and considered economical up to about 25 ft in height.
This approach is very useful for new less experienced civil engineers for optimum design of counterfort earth retaining wall. This design example focuses on the analysis and design of a tapered cantilever retaining wall including a comparison with model results. Counterfort retaining wall design example epub pdf sport. A basement wall counterfort retaining wall design example thus one kind of counterfort retaining wall design example wall. This session is not intended to teach concrete design, but more of an awareness of why things are the way they are. I have to design a stepped retaining wall for 22m height. Mar 04, 2019 to further understand the designed approach, here is a worked example of the design of the retaining wall. The geotechnical failure modes, which need to be considered in the design of a counterfort retaining wall are i horizontal sliding along the base of the wall, ii the rotation about the toe of the wall overturning, and iii bearing capac. The optimization of costs is essential for the competitiveness of the construction company, and the. Thickness of toe slab buttress not provided 8% of height of wall. Basics of retaining wall design page x preface to the tenth edition this tenth edition, like its predecessors, become necessary because building codes change seismic design requirements for example and as we receive suggestions for topics to be added or expanded. Types of retaining walls tieback wall tieback is a horizontal wire or rod, or a helical anchor use to reinforce retaining wall for stability one end of the tieback is secured to the wall, while the other end is anchored to a stable structure i. The retaining wall supports 150 of level roadway embankment measured from top of wall to top of footing. Typical design of reinforced concrete cantilever retaining walls and geogrid retaining walls has been provided for the purpose of cost, quality, timeconsumption and appearance.
Therefore, they are usually not reinforced with steel. This project represents design of stabilized walls as suggested by different codes researchers. Counterfort retaining wall guidelines for design of counterfort retaining walls pillai and menon, 2009 are available at. Concrete retaining walls may be considered in terms of three basic categories. Design and detailing of counterfort retaining wall design and detailing of counterfort retaining wall when the height of the retaining wall exceeds about 6 m, the thickness of the stem and heel slab works out to be. Gravity retaining wall 3 cantilever retaining wall with shear key batter drainage. Counterfort retaining wall design example using asdip retain. The counterfort wall is more commonly used because it has a clean, uncluttered exposed face and allows for more efficient use of space in front of the wall. Analysis and design of stepped cantilever retaining wall. Because of provision of counterforts, the vertical stem as well as the heel slab acts as a continuous slab, in. Some common materials used for retaining walls are treated lumber, concrete block systems, poured concrete, stone, and brick. After this present you will be able to do the completecomplete design design andand detailingdetailing ofof. However, retaining walls can also be constructed for aesthetic landscaping purposes.
In this type of retaining wall, counterforts cantilevers are provided on the earth side between wall and footing to support the wall, which essentially spans as a. The purpose of this article is for the reader to fully understand the principle behind it. The following figure shows theses different types of retaining walls. Jan 31, 2018 but if a retaining wall is retaining backfill having sloppy face for insulation purposes lets say, then it should not experience the pressure due to full height in my opinion. Section is changed if its undesirable from the stability or economy point of view. Rw backfill counterfort buttress weep hole counterfort rw buttress rw 7 earth. Design and analysis of retaining walls 2 economical when the wall height exceeds 8m. Home temblor en design of cantilever and counterfort retaining walls pdf. The wall will be built adjacent to the roadway shoulder where traffic is 2 ft. So, to retain the soil, so we have to build the structure for this type of retaining wall.
Assuming that the allowable bearing pressure of the soil is 120 knm 2, the. Pdf design and detailing of retaining walls arch fox. The use of a counterfort will be determined by the relative costs of. Retaining wall design design example 1 design a cantilever retaining wall t type to retain earth for a height of 4m. Jun 19, 2018 design steps and procedure of counterfort retaining wall is explained in this video. Design of cantilever retaining wall, design of cantilever steel beam, design of cantilever steel plate, design of cantilevered retaining walls, design of cantilevered metal stud wall, design of cantilever sign base, design of cantilevered stair vibration, design. We will discuss about various type of retaining wall, how to choose the dimension. Design of retaining wall with counterfort according to aci 318 08. In such a case counterforts having trapezoidal section fixed at the base slab are provided at intervals of 1. Provide the distribution steel 25 design example cantilever retaining wall. It is a power point presentation on counterfort retaining wall. Department of civil engineering 6 in the counterfort retaining wall, the stem and the base and the base slab are tied together by counterforts, at suitable intervals.
The retained material or backfill exerts a push on the structure and thus tends to overturn or slide it, or both. Retaining counterfort wall design free download as pdf file. All the above methods have been discussed with an example of typical counterfort retaining wall. They are built from solid concrete or rock rubble mortared together. Design principles of totally prefabricated counterfort retaining wall. Because soil is having slope on opposite side, away from wall and hence if a failure plan would occur, it will cause soil to slide away from wall, not towards wall. Retaining wall, because retaining wall is very important structure in geotechnical engineering. Design principles of totally prefabricated counterfort retaining wall system compared with existing castinplace concrete structures. Sep 20, 2016 analysis and design of a retaining wall chapter one introduction retaining walls cantilever rw rankin theory forces on cantilever rw counterfort rw forces on counterfort rw the gravity rw forces on gravity rw chapter two stability of retaining wall soil properties of rws drainage in rw allowable bearing capacity chapter three procedure for the continue reading analysis and design of a. Design and detailing of counterfort retaining wall when the height of the retaining wall exceeds about 6 m, the thickness of the stem and heel slab works out to be sufficiently large and the design becomes uneconomical. The objective of this research was to conduct a field performance study on a full scale cantilever retaining wall in order to verify or modifyu current design. D ata sheet concrete retaining walls concrete retaining walls provide a durable solution that is required of a structure in contact.
Preliminary proportioning of counterfort retaining wall. Cantilever concrete retaining walls are commonly used for residential purposes, often as integral basement walls. Reliability analysis of counterfort retaining walls. Then, stability of wall is checked for these dimensions. Guidelines for design of counterfort retaining walls. We stand for making engineering education a practical approach. In no case thickness of any component be less than 300mm. In this example, the structural design of the three retaining wall components is performed by hand. Lateral forces on retaining wallsence 454 assakkaf design of retaining walls the design of retaining wall must account for all applied loads. The counterfort wall system is designed in accordance with american railway engineering and maintenance of way association arema, american association of state highway and transportation officials aashto and state department of transportation dot codes, based on load resistance factor designs with service level checks where required by code. The counterfort wall system is designed in accordance with american railway engineering and maintenanceofway association arema, american association of state highway and transportation officials aashto and state department of transportation dot codes, based on load resistance factor designs with service level checks where required by code. The safety factor against sliding minimum required f. There are another type of retaining wall called counterfort rw and is a. This example is intended to be readily calculated by hand although a lot of structural spreadsheets and software such as prokon are available.
Retaining walls are structure used to retain soil, rock or other materials in a vertical condition. Whereas, if bracing is in front of the wall and is in compression instead of tension, the wall is called buttress retaining wall. Proportioning first, approximate dimensions are chosen for the retaining wall. Post graduate student, walchand institute of technology, solapur. Sketches of the retaining wall forces should be considered to properly distinguish the different forces acting on our retaining wall as tackled in the previous article, retaining wall. Types of reinforced concrete retaining walls are cantilever retaining walls and counterfort retaining walls. Hence they provide a lateral support to vertical slopes of soil that would otherwise collapse into a more natural shape. As for this height, cantilever retaining wall is not recommended and counter fort retaining wall is not economical. Counterfort retaining wall spreadsheet concrete design. Retainpro is an established engineering design software specifically for retaining walls. This document is a stepbystep design example of a typical.
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