This approach is very useful for new less experienced civil engineers for optimum design of counterfort earth retaining wall. At regular intervals, however, they have thin vertical concrete slabs known as counterforts that tie the wall and the base slab together. Oct 25, 2016 it is a power point presentation on counterfort retaining wall. Counterfort retaining wall design example using asdip retain duration. Section showing counterfort retaining wall for bus parking area at m level. Abarac current retaining wall design procedures are summarized with emphasis on the prediction of lateral earth pressures using the coulomb and rankine earth pressure theories, and the equivalent fluid pressure method. Design and detailing of retaining walls learning outcomes. Department of civil engineering design of reinforced concrete structure 2170607 counterfort retaining. It is a power point presentation on counterfort retaining wall. Geotechnical engineers should be hired to evaluate the overall stability of the site.
Titling cantilever wall in grand rapids, michigan a tilt of 10o increases the load by 20% this problem likely exacerbated by undercutting of the footing by the grand river, at left. The following figure shows theses different types of retaining walls. 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. Earth pressure p 8 earth pressure is the pressure exerted by the retaining material on the retaining wall. Cantilever retaining wall design counterfort retaining wall. This construction video is the part 2 series of retaining wall design. Active earth pressure tends to variation of earth pressure deflect the wall away from the 5. Asdip retain is a structural engineering software for design of retaining walls.
It includes the design of counterfort retaining walls based on the ibc aci 318 provisions. Design of rectangular column footing design of rectangular column footing are a special case of rectangular columns, formed with the foundation footing. Mar, 2020 the fundamental requirement is that the wall is capable of holding the retained material in place without undue movement arising from deflection, overturning or sliding. Following is a graphical overview of the required design steps, with annotated screenshots of the software. As a second example, a fully precast concrete bridge was constructed. Important points in counterfort retaining wall design. 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. It is affixed with the inside face of the wall to also withstand lateral thrust. Component quality is important due diligence when a designer issues a design certificate a form 15 in queensland, the design is being certified against a specified criteria, for example as 4678, earth retaining structures code. A retaining wall is a structure designed and constructed to resist the lateral pressure of soil when there is a desired change in ground elevation that exceeds the angle of repose of the soil. How to design counterfort retaining walls using asdip retain.
The design of a counterfort retaining wall is similar in many respects to that of a cantilever retaining wall as far as computing overturning and sliding stability, bearing capacity, and soil. A crane is lifting a wall form to cast this reinforcedretaining wall. A counterfort retaining wall is similar to a cantilever wall that contains counterforts, or buttresses. Infill material the soil material placed behind the retaining wall facing. In such a case counterforts having trapezoidal section fixed at the base slab are provided at intervals of 1.
Worked example 2 design of concrete cantilever retaining. Counterfort retaining wall design example using asdip retain. Any design of stacked walls should consider the area of the passive reaction wedge, which may extend 6x the wall height out in front of the foot of the wall, depending on soil friction. Retaining wall construction counterfort retaining wall design. Design of retaining wall with counterfort engineering. Analysis of counterfort retaining wall with and without pressure relief shelf using soft computing technique article pdf available december 2016 with 2,622 reads how we measure reads. In minutes you can design or analyze nearly any configuration or loading condition for cantilevered, restrained, gravity, gabion, soldier pile, or segmental retaining walls. Staad pro retaining wall cantilever design in details. This document is a stepbystep design example of a typical counterfort retaining wall using asdip retain.
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. Pdf analysis of counterfort retaining wall with and without. The delay in construction has lead to a partial erosion of the backfill. Deflection generally governs design for cantilever walls more than 18 feet high. The ab stones provide a nominal setback of twelve degrees from vertical. 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. However, retaining walls can also be constructed for aesthetic landscaping purposes. Consider the cantilever retaining wall with the crosssection shown in the above figure a. This gl pressure tends to deflect the wall outward. It is time consuming to do all the stability and reinforcement design using in house tools. Water must not be allowed to build up behind the wall.
Assuming that the allowable bearing pressure of the soil is 120 knm 2, the. Download the excel based calculation sheets for creating the perfect design of any retaining walls as well as verifying the suitability of this retaining wall against overturning and sliding forces. Design principles of totally prefabricated counterfort retaining wall. The counterfort retaining wall adopted in the present study is based on such guidelines which will ensure the required. Classification of retaining walls gravity wallmasonry or plain concrete cantilever retaining wallrcc inverted t and l counterfort retaining wallrcc buttress wallrcc this excel sheet introduce design of counterfort retaining wall according. Note cables attached to wall and strung to a dead man anchor, outofview to right. As an example, consider the retaining wall shown below, which supports a flat backfill load. Sep 14, 2017 detailed drawing for counterfort retaining wall civil solutions. Types of reinforced concrete retaining walls are cantilever retaining walls and counterfort retaining walls.
It is time consuming to do all the stability and reinforcement design. Weber course content content section 1 retaining walls are structures that support backfill and allow for a change of grade. Earth pressure and retaining wall basics for nongeotechnical engineers richard p. And require design consistent with either cantilever or counterfort design. Reliability analysis of counterfort retaining walls. 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. Apr 03, 2018 asdip retain is a structural engineering software for design of retaining walls.
If you design retaining walls, you know its tedious and timeconsuming. In this video, you will learn various aspects of counterfort retaining wall along with the details of stability checks. A retaining wall refers to a structure that is designed and built up to defend the lateral pressure of soil, when any alteration occurs in ground. Retaining walls are designed to resist earth pressures exerted by only the weight of soil retained. Retaining counterfort wall design free download as pdf file. Drainage is an important aspect of any retainingwall project. Drainage material the crushed rock, gravel or similar material placed behind a retaining wall to convey ground water away from the wall and foundations. The objective of retaining walls is to withhold the soil at a slope that is in excess of it would usually take. The active pressure increases on the retaining wall proportionally from zero at the upper grade level to a maximum value at the lowest depth of the wall. Aci 318 08 design of retaining wall with counterfort. This 30foot tall reinforced concrete wall was being built in atlanta, georgia, in 1980 as part of the renovation of a portion of i75.
This study develops the design principles of the proposed system. Cantilever and restrained retaining wall design software. Retaining wall construction counterfort retaining wall. Basics of retaining wall design 10 editionth a design guide for earth retaining structures contents at a glance. Important points in counterfort retaining wall design written by doityourself staff. Design and analysis of retaining walls 3 f crib walls or coffer dams are cells or units to be filled with soil or builtup members of pieces of precast concrete or metal and are supported by anchor pieces embedded in the soil for. Design steps and procedure of counterfort retaining wall is explained in this video. Retaining wall construction retaining wall excel spreadsheet. Jun 21, 2018 counterfort retaining wall design example using asdip retain duration. Concrete retaining walls may be considered in terms of three basic categories. These are much less than the hydrostatic pressure exerted by water trapped behind the wall.
Pdf analysis of counterfort retaining wall with and. Ab engineering manual retaining walls allan block wall. Retaining wall rww3 is estimated to be in excess of 29 feet. 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. We believe that a twelve degree setback maximizes the leverage achieved by a battered wall, while providing a finished retaining wall that fulfills the. Design of retaining wall with counterfort according to aci. Reinforced concrete design, design theory and examples by t.
Counterfort wall concrete design eurocode standards. Aci 318 08 design of retaining wall with counterfort excelcalcs. This document is a stepbystep design example of a typical. There are another type of retaining wall called counterfort rw and is a. The retained material or backfill exerts a push on the structure and thus tends to overturn or slide it, or both. Design considerations and alternatives for retaining walls. Unfortunately this is not something that many people are aware of when they are building and they could potentially save you from a serious headache. 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. Results from pre vious large scale retaining wall tests and field studies are presented.
Active earth pressure or earth pressure pa and passive earth pressure p p. We stand for making engineering education a practical approach. The fundamental requirement is that the wall is capable of holding the retained material in place without undue movement arising from deflection, overturning or sliding. Concrete masonry reinforced cantilever retaining walls edition e3, may 20 isbn 0 909407 56 8. Department of civil engineering design of reinforced concrete structure 2170607 counterfort retaining wall. Other articles where counterfort retaining wall is discussed. The contractor will use guidance provided in exhibit a. Such structural solution significantly facilitates installation of an element at the construction site.
When it comes to a retaining wall design, the points in counter fort are extremely important. A complete design should address each of these modes of failure where appropriate. The purpose of this calculation is to design retaining wall and check the adequacy of this retaining wall against overturning and sliding forces. Name 120106039 kaizer dave 120106045 kishan vyas 120106061 binoy patel internal guide. The design process for a segmental retaining wall typically has a wall design engineer or site civil engineer responsible for the wall design envelope. Counterfort retaining wall guidelines for design of counterfort retaining walls pillai and menon, 2009 are available at optimal proportions of typical counterfort retaining walls. Earth pressure and retaining wall basics for nongeotechnical. Possible modes of failure for freestanding concrete cantilever retaining walls are illustrated in cartoon fashion in figure x. Counterfort retaining wall design excel jobs, employment. The video includes brief calculation made for cantilever and counterfort wall.
Reliability analysis of counterfort retaining walls electronic. Counterfort retaining wall architecture britannica. 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. The basic design precepts employed in cantilever walls include considerations of dead man tiebacks, taking active pressures to the bottom of the wall and considering any reductions in passive resistance for inclined slopes. Design of retaining wall with counterfort according to aci 318 08. Drainage is an important aspect of any retaining wall project. P a active earth pressure or earth pressure pa and passive earth pressure pp.