For this height of sand, determine the maximum bending moment in the sheet pile wall. Design requirements for retaining walls and associated structures retaining wall performance standards during design life 3. The stem is a vertical cantilever beam, acted on by the horizontal earth pressure. 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. We require this information in order to email you a working demo. Lrfd resistance factors for maryland retaining walls. P a active earth pressure or earth pressure pa and passive earth pressure pp. Worked example 1 design of cantilever pol retaining. Support and documentation for the geo5 software using standards and analysis settings inputting the geological profile creating an output report bim export in the geo5 software. Cantilever retaining wall ouestion for the retaining wall and the profile shown below, calculate. Mechanically stabilized earth mse retaining walls are growing in popularity. Reinforced concrete cantilever retaining walls consist of a relatively thin stem and a base slab. Cantilever retaining wall analysis and design aci 31814 design example. Basics of retaining wall design 10 editionth a design guide for earth retaining structures contents at a glance.
Full details of masonry wall construction are provided in reinforced concrete masonry cantilever retaining walls design and. If you design retaining walls, you know its tedious and timeconsuming. This is a simple web app that is able provide a basic design of a cantilever retaining wall based on user inputs. Ce 537, spring 2011 retaining wall design example 3 8 3. Here is a listing of design capabilities contained in this cantilevered retaining wall module. The purpose of this paper is to describe the design and construction of reinforced cantilevered retaining walls. Ground water behind a retaining wall, whether static or percolating through a subsoil, can have adverse effects upon the design and stability. Such walls are known as semi gravity retaining wall. Active earth pressure tends to variation of earth pressure deflect the wall away from the 5.
Concrete masonry reinforced cantilever retaining walls. In cantilever retaining wall also, the similar type of failure occurs as that of in the gravity wall. Ab engineering manual retaining walls allan block wall. It is so named because its individual parts toe, heel, and stem behave as, and design as, cantilever beams. The design of the above retaining wall structures must consider all the. For situations where walls above a slope cannot be avoided, conduct a rigorous stability analysis following conditions identified in the design considerations section of this chapter. Many engineers use the cantilever wall term to actually describe gravity walls. Earth pressure p 8 earth pressure is the pressure exerted by the retaining material on the retaining wall. Retaining walls and chapter 730 steep reinforced slopes. Cantilever retaining wall cantilever retaining walls are made of reinforced cement concrete. Final duevel arema retaining wall design for the railroad.
Worked example 2 design of concrete cantilever retaining. Request documents that are not currently available by emailing. At the first calculation phase, the back analysis was performed in. The stem is a vertical cantilever beam, acted on by the horizontal earth. It offers a number of retaining wall shapes and analyzes rc crosssections. Course objectives they seem to crop up everywhere, like cell phone towers. Examples of this include cip cantilever, mse and modular block walls. Assuming that the allowable bearing pressure of the soil is 120 knm 2, the. Worked example 1 design of cantilever pol retaining walls. Our experience is in substructual engineering, geotechnic al engineering and higher level computer languages. Identical to cantilever retaining walls but thin slab stems is applied at some space to affix the base slab and stem so as to minimize the shear force and bending moment to reduce the design costs significantly.
Design and detailing of retaining walls learning outcomes. Static pressure on retaining wall the seismic behavior of retaining wall depends on the total lateral earth. The focus of the guideline is the geotechnical aspects of retaining wall design. Semigravity retaining wall the size of section of a gravity retaining wall may be reduced if a small amount of reinforcement is provided near the back face. Active earth pressure or earth pressure pa and passive earth pressure p p. The wall is assumed to be located in the christchurch port hills.
Feb 06, 2018 staad pro retaining wall analysis and design cantilever type 2018 easy method duration. This is an extremely popular system offering benefits that include zero lot lines, a vertical wall face and a range of possible finishes. You may also include a weightless fence on top of the wall for the purpose of collecting. Stepbystep design of a cantilevered retaining wall. An earth retaining system or retaining wall is one of the key road design elements.
For illustration purposes, the following figures provide a sample of the input modules and results. The example calculations are made here using mathcad. An earthretaining system or retaining wall is one of the key roaddesign elements. Design guidelines are shown in figure 2, and include. Main features calculate earth pressure coefficients based on rankines theory and coulombs theory. Design of the retaining wall structures on the m4 smart motorway. Retaining wall design guide to retaining wall design. Staad pro retaining wall analysis and designcantilever type 2018 easy method duration. Cantilever walls are walls that do not have any supports and thus have a free unsupported excavation. Surcharge large surcharge loads are induced on retaining walls in close proximity to track. Determine the factors of safety against sliding and overturning. Pdf a large number of relatively high cantilever retaining structures in.
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. Cantilever walls restrain retained earth by the passive resistance provided by the soil below the excavation. Calculate lateral earth pressure forces acting on the wall. Bartoskewitz engineering research associate research report no. Cantilever retaining wall functions and design considerations. Two case studies of retaining wall failures are presented. In addition, the flexural failure mechanism also occurs in cantilever wall. Worked example to accompany mbie guidance on the seismic design of retaining structures for residential sites in greater christchurch version 2 november 2014. Cantilever wall is an intuitive program for cantilever retaining walls design.
The ab stones provide a nominal setback of twelve degrees from vertical. 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. Cantilever walls cantilever wall design deep excavation. 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. 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. Cantilever timber pole walls are probably the most commonly used form of. Cantilevered st em wall can have up to five different stem sections, of either masonry or concrete, each with a different thickness andor reinforcing size and spacing. Because our engineers are also consultants, soilstructure software is in sync with current state of practice. Design of cantilever pole retaining walls to resist earthquake loading for residential sites. The wall friction has been neglected in the analysis, but it is required for calculation of sliding factor of safety for the wall. Foundation design 18 example 1 design the cantilever sheet pile wall that satisfy the requirements for stability of the wall. Deflection generally governs design for cantilever walls more than 18 feet high. The following worked example is for a freestanding cantilever wall that is considered sufficiently flexible for active. Aesthetic elements surrounding a particular retaining wall are key to public acceptance of a wall project.
Cantilever walls the cantilever wall figure 1b and figure 2 is the most common type of retaining structure and generally is used for walls in the range from 10 to 25 ft in height. The design of the structure shall readily allow for strengthening of the structure e. The safety factor against sliding minimum required f. 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. Along with the direct function of holding back earth, it provides opportunities for aesthetic enhancement of transportation systems. The geotechnical manual documents the departments standards of practice for geotechnical investigations, design, and reporting. Usually the cantilever wall stem is of concrete block construction rising from an insitu concrete foundation.
Cantilever sheet pile the two basic methods of designing anchored sheet pile walls pressure envelop for braced cut design the struts limit lateral wall, sheet pile wall design example download as pdf file. This document is published by the chief executive of mbie. Common design issues are described in the following sections. Design the reinforced concrete masonry cantilever retaining wall shown in figure 2. Soilstructure software increases the engineers bottom line by eliminating hours of tedious calculations. Design of concrete cantilever retaining walls to resist. For illustration purposes, the following figures provide a sample of the. Gabion is an intuitive program for gabion retaining walls design. We believe that a twelve degree setback maximizes the leverage achieved by a battered wall, while providing a finished retaining wall that fulfills the. You may also include a weightless fence on top of the wall for the purpose of. Cantilever retaining wall reinforced concrete wall with small dimensions and it is the most economical type and the most common note. Cantilever retaining wall design using asdip retain youtube. Reinforced concrete cantilever retaining wall analysis and design.
A retaining wall acts as a link between various highway structures and adjacent land forms. Ce 437537, spring 2011 retaining wall design example 3 8 3. Table 1 provides the order of precedence for reference documents and. 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. Design and construction of cantilevered retaining walls.