Rccii design steps for cantilever retaining wall youtube. They are composed of a light form of concrete that is further blended with aggregates to make the blocks sturdier. Mar 24, 2018 example of rc retaining wall design in tedds 2018. Reinforced concrete cantilever retaining wall analysis and design. Retaining walls types details with analysis and design.
Retaining wall design example applied and interdisciplinary. Consider the great wall of china, for example, where transverse bamboo poles were used to tie the walls together a forerunner of todays mechanically. Worked example 2 design of concrete cantilever retaining. Worked examples presented at the workshop eurocode 7. The wall will be built adjacent to the roadway shoulder where traffic is 2 ft. 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. Retaining wall design for the railroad infrastructure. Staad pro retaining wall analysis and designcantilever type 2018 easy method duration.
Where the backfill is greater than 12 ft in height, such proposed walls shall be designed per a geotechnical investigation and report prepared by a licensed geotechnical engineer and shall. This session is not intended to teach concrete design, but more of an awareness of why things are the way they are. Examples of this include cip cantilever, mse and modular block walls. For retaining wall design, the applicable train liveload surcharge is the cooper e80, which can be approximated as 1,880 pounds per square foot per foot psfft of rail.
Staad pro retaining wall analysis and design cantilever type 2018 easy method duration. In this example, the structural design of the three retaining wall components is performed by hand. The safety factor against sliding minimum required f. In such a case counterforts having trapezoidal section fixed at the base slab are provided at intervals of 1. This example is intended to be readily calculated by hand although a lot of structural spreadsheets and software such as prokon are available. A n beal earth retaining structures worked examples 1 worked examples of retaining wall design to bs8002 the following worked examples have been prepared to illustrate the application of bs8002 to retaining wall design. Retaining wall designrev bogor agricultural university. These design methods are discussed in detail in allowable stress design of concrete masonry, tek 147a, and strength design of concrete masonry, tek 144a refs. The compaction plant can be represented approximately by a surcharge load equal to the weight of the roller. Ce 437537, spring 2011 retaining wall design example 1 8 design a reinforced concrete retaining wall for the following conditions. Earthquake load the force exerted on the structure by earthquake action, acting on either or both the face of the retaining wall and any other structure supported by the retaining wall. The procedure is more of a general summary and an appreciation of the role of subsurface exploration in geotechnical design. Design the reinforced concrete masonry cantilever retaining wall shown in figure 2.
Example 1 retaining wall designs using retaining blocks. Some easytoadopt retaining wall design ideas have been listed below. Design of soldier pile retaining wall data required for soldier pile wall design. The wall thickness is generally considered to be the width of the vertical element and facing. Lateral forces on retaining wallsence 454 assakkaf design of retaining walls the design of retaining wall must account for all applied loads. We believe that a twelve degree setback maximizes the leverage achieved by a battered wall, while providing a finished retaining wall that fulfills the. A n beal earth retaining structures worked examples. Principles of retaining wall design the constructor. Retaining walls in theory and practice, a textbook for.
Stability limit state a limit state of loss of static equilibrium of a structure or part thereof, when considered as a rigid body. The following worked example is for a freestanding cantilever wall that is considered. This is where geogrid comes in allan blocks reinforcement grid provides a simple solution by creating a solid structure with more resistance to soil pressure and surcharges for retaining walls under 6 ft. 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. Assuming that the allowable bearing pressure of the soil is 120 knm.
Cantilever retaining wall reinforced concrete wall with small dimensions and it is the most economical type and the most common note. 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. We believe that a twelve degree setback maximizes the leverage achieved by a battered wall, while providing a finished retaining wall that fulfills the goal of more useable flat land. Active earth pressure tends to deflect the wall away from the backfill. The paper covers a theoretical approach in data acquisition needed for design of a retaining wall.
Type of retaining wall failure to design retaining walls, it is necessary to know how wall can fail. Reinforced concrete wall design basics mike oshea, p. Analysis and design of a retaining wall download project. Worked example 2 design of concrete cantilever retaining walls to. Retaining counterfort wall design free download as pdf file. These includes nature of the soil, friction angle of the soil, density of the soil, passive and active allowable pressures, arching factors to use, and other recommendations which specifically related to the site. Learn more about reinforced retaining wall construction. The objective of this guideline is to provide information on retaining wall design in accordance with the city of nanaimo the city and the british columbia building code bcbc requirements. 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.
In general, they are used to hold back or support soil banks and water or to maintain difference in the elevation of the ground surface on each of wall sides. Concrete masonry reinforced cantilever retaining walls edition e3, may 20 isbn 0 909407 56 8. This design example focuses on the analysis and design of a tapered cantilever retaining wall including a comparison with model results. Geotechnical investigation and analysis performed by the geotechnical section 3. The following text provides a general discussion and design guidelines for these flexible wall. Norfolk and tasman retaining walls au keystone retaining wall systems.
The retaining wall supports 150 of level roadway embankment measured from top of wall to top of footing. The ab stones provide a nominal setback of twelve degrees from vertical. Then, stability of wall is checked for these dimensions. However, retaining walls can also be constructed for aesthetic landscaping purposes. Preface standards australia has published as 46782002 for the design of earth retaining structures, which.
There various parts of a retaining wall and design principles of these retaining wall components based on different factors and. For example, the buildings with shallow foundation may be taken as a uniform surcharge of 10kpa per storey. Mar 04, 2019 to further understand the designed approach, here is a worked example of the design of the retaining wall. Cantilever retaining wall ouestion for the retaining wall and the profile shown below, calculate. However this isnt the case if the retaining wall is. For details of other type the book foundation analysis and design by j. There various parts of a retaining wall and design principles of these retaining wall components based on. Wisdot bridge manual chapter 14 retaining walls january 2019 147 14. Worked example to accompany mbie guidance on the seismic design of retaining structures for residential sites in greater christchurch version 2 november 2014. Basics of retaining wall design 10 editionth a design guide for earth retaining structures contents at a glance.
Detailed design and plan development the bridge design bureau is normally responsible for producing the final wall plans and specifications, based on the. Consider the cantilever retaining wall with the cross section shown in the above figure a. Active earth pressure or earth pressure pa and passive earth pressure p p. Design of retaining wall with counterfort engineering. Variations on the basic design, including curves, tiers, railings, stairs, walkways and the like are making them more and more attractive to designers and architects. Retaining wall design proceeds with the selection of tentative dimensions, see fig. Retaining blocks are among the easiest of constructional elements used for building retaining walls. The cantilever retaining wall shown below is backfilled with granular material having a unit weight. Proportioning first, approximate dimensions are chosen for the retaining wall. Usually the cantilever wall stem is of concrete block construction rising from an insitu concrete foundation.
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 example the following design example briefly illustrates some of the basic steps used in the allowable stress design of a reinforced concrete masonry cantilever retaining wall. They are not full detailed calculations such as might be prepared for a real wall design but are limited to the calculation of earth pressure and bearing capacity, showing how the recommendations of bs8002 are applied in practice. The purpose of this article is for the reader to fully understand the principle behind it. Cantilever concrete retaining walls are commonly used for residential purposes, often as integral basement walls. A slope above a retaining wall will add more pressure and weight, while slopes below the retaining wall may make the. Compaction of backfill behind a retaining wall is normally affected by the compactors. Example 8 cantilever wingwall design loads 6 21 design section b summary the abutment width along the skew, a 3. Geotechnical design dublin, 14 june, 20 support to the implementation, harmonization and further development of the eurocodes eurocode 7. Figure 1 illustrates typical cantilever retaining wall detailing requirements.
The retaining wall is fixed to the reinforced concrete slab. Course objectives they seem to crop up everywhere, like cell phone towers. 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. Determine the factors of safety against sliding and overturning. Conditions above and behind the retaining wall will determine how tall the retaining wall can be before reinforcement is needed. 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. Surcharge large surcharge loads are induced on retaining walls in close proximity to track. Soldier pile retaining wall components and design of. The wall stem is 16 wide to accommodate mounting a type 7 bridge rail to the top of wall. Retaining wall design example free download as pdf file. The following worked examples have been prepared to illustrate the application of bs8002 to retaining wall design. Section is changed if its undesirable from the stability or economy point of view.
Final duevel arema retaining wall design for the railroad. Reinforced concrete cantilever retaining wall analysis and. The load that presents the greatest problem and its primary concern is the lateral earth pressure induced by the retained soil. Concrete masonry reinforced cantilever retaining walls. The focus of the guideline is the geotechnical aspects of retaining wall design. Mechanically stabilized earth mse retaining walls are growing in popularity. After this present you will be able to do the completecomplete design design andand detailingdetailing ofof differentdifferent typestypes ofof. Common design issues are described in the following sections. However, retaining wallscanalsobeconstructed for aesthetic landscaping purposes. Mcgrawhill international edition, 1997 may be referred.
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