Worked example 2 design of concrete cantilever retaining. In this example, the structural design of the three retaining wall components is performed by hand. Reinforced concrete design of retaining wall ceref. 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. A sufficient anchorage would need to be provided at the top of the wall to carry 30 lbft. Reinforced concrete stocky wall is where the effective height he divided by the thickness h does not exceed 15 for a braced wall and 10 for an unbraced wall. Fairfax county, virginia typical retaining wall details sheet 7 of 8 concrete retaining walls general requirements 1. Updated and expanded throughout, this new edition covers nearly every type of retaining strucutre.
Typical retaining wall details package based on the 2006 virginia construction code contents timber retaining wall. The following worked example is for a freestanding cantilever wall that is considered sufficiently flexible for active soil pressures to be used for design. Design of reinforced concrete wall concept, calculations reinforced concrete wall is designed as a compression member. Worked example to accompany mbie guidance on the seismic design of retaining structures for residential sites in greater christchurch version 2 november 2014. Mar 22, 20 basics of retaining wall design 9th edition design guide for earth retaining structures. Cantilever retaining walls are investigated, being representive of reinforced concrete retaining corresponding. Cantilever retaining walls are most commonly and widely used type of retaining wall. Classification of retaining walls gravity wallmasonry or plain concrete. Basics of retaining wall design 9th edition design guide for earth retaining structures. The formulation of the problem includes important design variables such. Concrete masonry reinforced cantilever retaining walls edition e3, may 20. The intent of this material is to communicate the best practices for design of segmental retaining walls srw as determined by allan block corporation based on 25 plus years of research, design and field experience. Retaining wall construction details for wall design and. A minimum cost based design of reinforced concrete retaining structures was undertaken by ceranic et al 3.
Retaining wall design of reinforced concrete structure. The design example, buried concrete basement wall design, details strength design durability and other considerations not included for a new buried concrete basement wall in a singlestory masonry building. The bank of supported earth is assumed to weigh 110 lbft. D ata sheet concrete retaining walls concrete retaining walls provide a durable solution that is required of a structure in contact. Reinforced concrete cantilever retaining wall analysis and. The use of the city of alexandria typical retaining wall details for a tiered or stacked retaining wall system is strictly prohibited. The wall design shall address both internal and external 2. Types of retaining wall cantilever retaining wall it consists of a. Design of reinforced concrete load bearing shear wall. Reinforced concrete retaining walls have a vertical or inclined stem cast with. In 1990 the concrete masonry association of australia cmaa published masonry walling guide no 4. Three numerical examples with different wall heights. The example follows the provisions of aci 31811, building code requirements for structural concrete.
Seismic design categories b through f skga web seminar dvd with pdf handout s. Topic 11 seismic design of reinforced concrete structures. Design for earth loads retaining walls, which set out a design. May 29, 2018 the intent of this material is to communicate the best practices for design of segmental retaining walls srw as determined by allan block corporation based on 25 plus years of research, design and field experience. Concrete masonry retaining walls meet these requirements admirably. The construction of a concrete retaining wall shall conform to the dimensions and reinforcing steel requirements shown in figure and table 2. Reinforcing steel shall comply with astm a615 and shall have a yield strength of 60,000 psi. Cantilever concrete retaining walls are commonly used for residential purposes, often as integral basement walls. Pdf optimal design of reinforced concrete retaining. Design of semi gravity retaining walls 1 a semi gravity retaining wall consisting of plain concrete weight 145 lbft.
Costbased optimum design of reinforced concrete retaining. Types of retaining wall cantilever retaining wall it consists of a vertical wall called stem, heel slab and toe slab. Masonry retaining wall design based on aci 53099 and aci 31802. Types of reinforced concrete retaining wall and their parts. The cantilever is the most common type of retaining wall and is used for walls in the range of 3to 6m in height. Stability of srw gravity walls depends solely upon the dead weight resisting moment. Cantilever retaining walls figure b are made of reinforced concrete that. Figure 1reinforced cantilever retaining wall detailing mortar cap or other, as desired bond beam. This force is smaller than the 30 lbft anchorage force from a 5 psf uniform lateral load see example a. With this powerful software, youll have the answers to all the toughest design challenges in your area. When you want to be the goto resource for redirock designs, having a copy of geo5 redirock wall professional is the way to go. Oct 16, 2017 types of retaining wall gravity wall made of plain concrete or brick masonry the stability of the wall is maintained by its own weight made up to a height of 3 m.
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. A reinforced concrete load bearing shear wall supporting for a four story building. Design of concrete cantilever retaining wall civil. 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. Reinforced concrete masonry cantilever reaining walls. They are the simple unreinforced vertical face gravity retaining wall, the steel reinforced cantilever retaining walls, and the segmental retaining wall. Retaining wall design example design a reinforced concrete. Results from pre vious large scale retaining wall tests and field studies are presented. During this lesson you will learn the basics of seismic design of reinforced concrete buildings. The design and planning phase of retaining walls is critical and must address the actual site conditions, including soil and loading, that the wall will be subjected to. This session is not intended to teach concrete design, but more of an awareness of why things are the way they are.
Design of reinforced concrete wall guidelines, concept. Following are the types of reinforced concrete retaining walls. Preliminary wall height guides retaining wall blocks. Panel diaphragms have been used extensively for roofs, walls, floors and partitions, for both new construction and rehabilitation of older buildings. Design of reinforced cantilever retaining walls using. Mse retaining wall design considerations by marcus galvan. In recent years, successful applications of particle. Example 11 castinplace concrete cantilever retaining wall 3 2018 ev 3 ev 1 ev 2 ls v ls h eh dc dc 2 dc 4 dc 3 front face. Fairfax county, virginia home to home inspection inc. Dowels can be lapped above the footing in accordance with figure 14. Types of retaining wall gravity wall made of plain concrete or brick masonry the stability of the wall is maintained by its own weight made up to a height of 3 m. Design load is a vertical load of 40 lbft at an eccentricity of 4 inches outside the wall seismic design.
Retaining walls types details with analysis and design. Reinforced concrete a fundamental approach fifth edition retaining walls ence 454 design of concrete structures department of civil and environmental engineering university of maryland, college park spring 2004 by dr. The stem may have constant thickness along the length or may be tapered based on economic and construction criteria. The following parameters influence the design of the retaining wall. The formulation of the problem includes important design variables such as the geometrical. Standard a description of the analysis method design tables for a limited range of soil conditions and wall geometry a design example which demonstrates the use of the australian standard and analysis method analysis of cohesive soils a site investigation check list a detailed. Mse retaining wall design considerations by marcus galvan, p. Ahmadinedushan and varaee 3 used pso for optimal design of reinforced concrete earthretaining walls. With this powerful software, youll have the answers to all the toughest. The following figure shows the cantilever retaining wall. This study presents analyses and design of cantilever retaining wall which is made from an internal stem of steelreinforced, castinplace concrete often in the shape of an inverted t. Aci e702 example problems buried concrete basement wall l.
In 1990 the concrete masonry association of australia cmaa published masonry walling guide no 4 design for earth loads retaining walls, which set out a design methodology for earth retaining structures. Seismic design categories b through f skga web seminar dvd with pdf handout. Reinforced concrete wall design basics mike oshea, p. Method statement for retaining wall work execution retaining wall work shall be taken up for a length of 10m to 20m to suit the site condition duly considering the safety aspect. Design of semi gravity retaining walls wec civilians. Basics of retaining wall design 10 editionth a design guide for earth retaining structures contents at a glance. Concrete masonry reinforced cantilever retaining walls. Too many forces are at work against a retaining wall that could cause it to tumble over if it is not reinforced correctly. Design horizontal reinforcement for shrinkage and expansion. Babu2 proposed an approach for reliabilitybased design optimization of reinforced concrete cantilever retaining wall. Usually the cantilever wall stem is of concrete block construction rising from an insitu concrete foundation.
To find the optimum solution, the particle swarm optimization pso algorithm is employed. Design concrete shear stress in wall section for inplane bending. A copy of these retaining wall details is required to be on the job site and available to the inspector during the construction and inspection process. Ce 437537, spring 2011 retaining wall design example 1 8 design a reinforced concrete retaining wall for the following conditions. The minimum concrete compressive strength at 28 days shall be 3,500 psi and shall comply with aci 318. Example the example of analysis and design of stepped cantilever retaining wall. Assuming that the allowable bearing pressure of the soil is 120 knm 2, the. The total height of different types of retaining wall shall be cast in 2 or 3 pours, keeping the maximum height of pour of 2. Buried concrete basement wall design problem statement provide a detailed strength design durability and other considerations not included for a new buried concrete basement wall in a singlestory masonry building using the given information. This session is not intended to teach concrete design, but more of an awareness of why things are the way they are american concrete institute building code requirements for. Basics of retaining wall design civil engineering community. Retaining walls must be reinforced in order to be effective.
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. Civil engineering excel sheets or civil engineering spreadsheets are available here for free download for members these civil engineering spreadsheets contain complete design of the structural elements. Wsdot standard plan reinforced concrete retaining wall. Design load is a vertical load of 40 lbft at an eccentricity of 4 inches outside the wall seismic design category a use the 2012 ibc required. Three different types of concrete masonry retaining walls are illustrated in figure 1. Ncma tek national concrete masonry association an information series from the national authority on concrete masonry technology concrete masonry gravity retaining walls tek 156 structural 1995 keywords. Learn how you can reshape the contours of your homes property and create flat space with the help of a retaining wall. Example 5 design a reinforced concrete bearing wall to support a series of steel wideflange beams at 8 ft0 in. Design a reinforced concrete retaining wall for the following conditions. Application to the story nehrp reinforced concrete framewall building design. This study presents analyses and design of cantilever retaining wall which is made from an internal stem of steel reinforced, castinplace concrete often in the shape of an inverted t. The focus of the guideline is the geotechnical aspects of retaining wall design. Pdf this paper concerns with the optimal design of reinforced concrete earth retaining walls.
Reinforced concrete cantilever retaining wall analysis and design aci 31814 reinforced concrete cantilever retaining walls consist of a relatively thin stem and a base slab. Ahmadinedushan and varaee 3 used pso for optimal design of reinforced concrete earth retaining walls. 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. Pdf optimal design of reinforced concrete retaining walls. Reinforced concrete wall is used in case where beam is not provided and load from the slab is heavy or when the masonry wall thickness is restricted. The other two forms of construction are covered in separate guides. 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. 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. Reinforced soil retaining wallsdesign and construction nptel. Designs are in general accordance with ncmas design manual 6. The wall is braced top and bottom against lateral translation.