The proposed prefabricated concrete counterfort retaining wall design was developed according to the 2012 aashto lrfd bridge design specifica. Retaining walls types details with analysis and design. Basics of retaining wall design 10 editionth a design guide for earth retaining structures contents at a glance. Rw backfill counterfort buttress weep hole counterfort rw buttress rw 7 earth. Types of retaining walls counterfort wall when the overall height of the wall. So, even if the wall is horizontal so it will act at a angle of delta. Design of retaining wall with counterfort according to aci. This example is intended to be readily calculated by hand although a lot of structural spreadsheets and software such as prokon are available. The system further includes a counterfort beam coupled at a first end to.
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. Hence they provide a lateral support to vertical slopes of soil that would otherwise collapse into a more natural shape. 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. Design and detailing of retaining walls for class held from 2 nd april 07.
Counterfort wall concrete design eurocode standards. 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. Counterfort retaining wall design example using asdip retain duration. Some common materials used for retaining walls are treated lumber, concrete block systems, poured concrete, stone, and brick. Cantilever concrete retaining walls are commonly used for residential purposes, often as integral basement walls.
Counterfort definition, a buttress, especially one for strengthening a basement wall against the pressure of earth. So, delta is the friction angle between soil and the wall. Concrete retaining walls may be considered in terms of three basic categories. So, to retain the soil, so we have to build the structure for this type of retaining wall. However, retaining walls can also be constructed for aesthetic landscaping purposes. Retaining counterfort wall design bending deep foundation.
Aci 318 08 design of retaining wall with counterfort. Counterfort retaining wall architecture britannica. As a second example, a fully precast concrete bridge was constructed. Provide the distribution steel 25 design example cantilever retaining wall.
Counterfort retaining wall design example using asdip retain. Design of a counterfort retaining wall researchgate. All the above methods have been discussed with an example of typical counterfort retaining wall. Pdf design and detailing of retaining walls arch fox. Some examples of tiered and hybrid walls systems are shown in. Retaining wall design design example1 design a cantilever retaining wall t type to retain earth for a height of 4m. Counterfort retaining wall spreadsheet concrete design. Counterfort retaining walls figure c are similar to cantilever walls. Department of civil engineering design of reinforced concrete structure 2170607 counterfort retaining wall gandhinagar institute of technology. 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. Design principles of totally prefabricated counterfort. The following section presents the formulation reliability index or probability of failure vs.
Section showing counterfort retaining wall for bus parking area at m level. It is a power point presentation on counterfort retaining wall. The following figure shows theses different types of retaining walls. We will discuss about various type of retaining wall, how to choose the dimension. P a active earth pressure or earth pressure pa and passive earth pressure pp. 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. Concrete masonry reinforced cantilever retaining walls edition e3, may 20 isbn 0 909407 56 8. 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. Active earth pressure or earth pressure pa and passive earth pressure p p.
There are another type of retaining wall called counterfort rw and is a. Retaining walls are structure used to retain soil, rock or other materials in a vertical condition. 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. So, this is the pa direction for the rankines, but for the coulomb. Counterfort retaining wall guidelines for design of counterfort retaining walls pillai and menon, 2009 are available at optimal. Calculate and compare active and passive earth pressures for both the cases. Aci 318 08 design of retaining wall with counterfort rev1. This document is a stepbystep design example of a typical counterfort retaining wall using asdip retain.
Other articles where counterfort retaining wall is discussed. The design of such walls will be on a casebycase basis, and is not discussed in this chapter. Design of retaining wall with counterfort engineering. Pdf analysis of counterfort retaining wall with and without. Counterfort retaining wall, are similar to the cantilever retaining wall only that this type has counterforts built behind to hold the wall stem and base together and is used where the cantilever is long or for very high pressure behind the wall this counterforts. Worked example 2 design of concrete cantilever retaining. It includes the design of counterfort retaining walls based on the ibc aci 318 provisions. To further understand the designed approach, here is a worked example of the design of the retaining wall. Ce 537, spring 2011 retaining wall design example 6 8 2. The retained material or backfill exerts a push on the structure and thus tends to overturn or slide it, or both. Due to the wall height of 25 feet, the use of counterforts has proven itself to be a more economical solution. Reliability analysis of counterfort retaining walls. 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.
Name 120106039 kaizer dave 120106045 kishan vyas 120106061 binoy patel internal guide. Earth pressure p 8 earth pressure is the pressure exerted by the retaining material on the retaining wall. Assuming that the allowable bearing pressure of the soil is 120 knm 2, the. This gl pressure tends to deflect the wall outward. Example 11 castinplace concrete cantilever retaining wall 4 2020 summary of unfactored loads and moments resolve moments about point a see figure 1 typical section load combinations ev 1 ev 2 dc 2 dc 3 vehicular collision load 18. Design steps and procedure of counterfort retaining wall is explained in this video.
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. As an example, consider the retaining wall shown below, which supports a flat backfill load. 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. In such a case counterforts having trapezoidal section fixed at the base slab are provided at intervals of 1. Gravity retaining wall 3 cantilever retaining wall with shear key batter drainage. The face joint member is partially positioned on a first side of the wall panels and extending between the wall panels through to a second side of the wall panels. This approach is very useful for new less experienced civil engineers for optimum design of counterfort earth retaining wall.
Most common materials used for retaining walls are. 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. Suggest suitable dimensions for the rc retaining wall example 1. The purpose of this article is for the reader to fully understand the principle behind it. Worked example to accompany mbie guidance on the seismic design of retaining structures for residential sites in greater christchurch version 2 november 2014. Retaining wall, because retaining wall is very important structure in geotechnical engineering. Deflection generally governs design for cantilever walls more than 18 feet high. Design principles of totally prefabricated counterfort retaining wall. Within these groups many common variations exist, for example cantilever walls may have additional supporting ties. A counterfort wall of 10 m height retains a noncohesive backfill. The void ratio and angle of internal friction of the backfill respectively are 0.
637 1227 271 139 606 1158 671 1001 111 660 111 550 333 1332 1384 121 758 844 525 504 801 548 100 118 1418 886 93 1170 141 855 1256 1397 416 822