Retaining walls in theory and practice, a textbook for. 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. Deflection generally governs design for cantilever walls more than 18 feet high. Design of reinforced concrete nonload bearing shear wall. Underpinning to be formed in continuous reinforced concrete. Retaining walls are utilized in the formation of basement under ground level, wing walls of bridge and to preserve slopes in hilly terrain roads. If the height of earth to be retaining surpasses 5m, the bending moment established in the stem, heel and toe slabs are very huge which lead to greater depth of structural components and turn into expensive. Maximum pressure at base should not exceed the sbc of soil. Worked example to accompany mbie guidance on the seismic design of retaining structures for residential sites in greater christchurch version 2 november 2014. Pro is one of the most widelyused software for developing and analyzing the designs of various structures, such as petrochemical plants, tunnels, bridges etc. A sufficient anchorage would need to be provided at the top of the wall to carry 30 lbft. D ata sheet concrete retaining walls concrete retaining walls provide a durable solution that is required of a structure in contact with soil and exposed to constant wetting and. Earth pressure is the pressure exerted by the retaining material on the retaining wall this on the.
Section is changed if its undesirable from the stability or economy point of view. Online civil engineering courses, university courses, basics of civil engineering, lecture notes, school video training from youtube. Soil is sandy silt with a unit weigh of 120 pcf, angle of internal friction 25 degrees and the water table is 8 ft below retaining wall crest. 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. Design a rcc cantilever retaining wall to remain a soil of 20 feet high. Shown in figure 1 are the cross sections of ty pical gravity retaining walls used earlier, and rcc. Retaining walls introduction in general, retaining walls can be divided into two major categories. 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. Design of a multistoried rc building 16 14 14 3 c 1 b 1 c 2 b 2 c 3 b 3 c 4 b 15 s 1 b 16 s 2 b 17 s 3 b 18 b 4 b 5 b 6 b 7 c 5 c 6 c 7 c 8 c 9 b 20 b 22 14 b 19 s 4 c 10 c 11 b 23 s 5 b 24 s 11. Ce 537, spring 2011 retaining wall design example 1 8 design a reinforced concrete retaining wall for the following conditions. We stand for making engineering education a practical approach.
Pro v8i, the latest version, allows civil engineering individuals to analyze structural designs in terms of factors like force, load, displacements etc. 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. Therefore, they are usually not reinforced with steel. N i n t h e d i t i o ndesign of reinforced concrete aci 31811 code edition jack c. Concrete deadman driven into the ground or anchored into the earth with sufficient resistance. Optimum cost design of reinforced concrete cantilever. Note that the top of the stem of any retaining wall should not be less than about 0. 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. Retaining wall design rcc structures civil engineering.
The wall must be strong enough to resist the bending moment and shear force. This session is not intended to teach concrete design, but more of an awareness of why things are the way they are. Design and detailing of retaining walls learning outcomes. Proportioning first, approximate dimensions are chosen for the retaining wall. Rcc retaining wallcantilevertype excel sheet engineering feed.
Classification of retaining walls cantilever retaining wallrcc inverted t and l counterfort retaining wallrcc buttress wallrcc 3. Cantilever concrete retaining walls are commonly used for residential purposes, often as integral basement walls. Design a rcc cantilever retaining wall to remain a. Gravity walls are the earliest known retaining structures. Retaining walls are used in the construction of basement below ground level, wing walls of bridge and to retain slopes in hilly terrain roads. In order to promote public education and public safety, equal justice for all, a better informed citizenry, the rule of law, world trade and world peace, this legal document is hereby made available on a noncommercial basis, as it is the right of all humans to. It may also be defined as a wall provided to maintain ground at two different levels. This force is smaller than the 30 lbft anchorage force from a 5 psf uniform lateral load see example a. This tek addresses the unreinforced gravity retaining walls only. Rccii design steps for cantilever retaining wall youtube. I m looking for a proper approach for designing a 3.
Design the cantilever wall and give approximate dimensions of heel, toe and base. 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. In this example, the structural design of the three retaining wall components is performed by hand. Basics of retaining wall design 10 editionth a design guide for earth retaining structures contents at a glance. Retaining wall are generally used to retain earth or other material to maintain unequal levels on two faces. Cantilever retaining wall reinforced concrete wall with small dimensions and it is the most economical type and the most common note. Pro v8i, the latest version, allows civil engineering individuals to analyze structural designs in terms of factors like force. Reinforced concrete shear wall analysis and design a structural reinforced concrete shear wall in a 5story building provides lateral and gravity load resistance for the applied load as shown in the figure below. The lateral forces from backfill is resisted by the weight of wall itself, and due to their massive nature, they develop little or no tension.
An rc retaining wall 5 m high above foundation base has to retain earth with a horizontal surface at the top. Gravity retaining wall and reinforced conc rete retaining wall used to retain soil. The density of retained earth is 16 knm3 and angle of repose is 300. 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. 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. Various optimization techniques to obtain the optimal design of cantilever walls have been proposed, where the three basic geotechnical constraints of overturning, sliding and bearing failures have generally been taken into consideration. Design of reinforced concrete wall guidelines, concept. Overview of design of rcc retaining walls deepak pai. Reinforced cement concrete retaining wall cantilever type maximum 6. Worked example 2 design of concrete cantilever retaining. Reinforced concrete design of retaining wall ceref. Ncma tek national concrete masonry association an information series from the national authority on concrete masonry technology concrete masonry cantilever retaining walls tek 157b structural 2005 keywords. The main feature of ga is the ability to change nonlinear constrains problems to linear with no constraint problems.
Gabion retaining wall retaining wall design concrete retaining walls retaining wall construction steel frame construction civil engineering construction design build firms wing wall. I came across following design guideline attached here. Rcc retaining wallcantilevertype excel sheet best online engineering resource. Rcc retaining wall design excel construction of rcc. Design of reinforced concrete wall concept, calculations reinforced concrete wall is designed as a compression member. Types of reinforced concrete retaining walls are cantilever retaining walls and counterfort retaining walls. Retaining walls are structures constructed for the purpose of retaining earth or other materials like coal, ore, water etc. Each of these retaining wall systems has its advantages, and the choice may depend on a number of factors including. Density of earth is 16000 nm 3 and its angle of repose is 30 the safe bearing capacity of soil at a depth of 1m below ground level is 100 knm 2. Shear wall section and assumed reinforcement is investigated after analysis to verify suitability for the applied loads. The focus of the guideline is the geotechnical aspects of retaining wall design. Design horizontal reinforcement for shrinkage and expansion.
Then, stability of wall is checked for these dimensions. Reinforced concrete cantilever retaining wall analysis and. Download spreadsheet for rcc retaining wall horizontally 3. Usually the cantilever wall stem is of concrete block. It is well established that genetic algorithm can be successfully. They are built from solid concrete or rock rubble mortared together. Reinforced concrete wall design basics mike oshea, p. Types of reinforced concrete retaining wall and their parts. Functions and parts of these retaining walls are discussed. The depth of foundation depends on the properties of soil. A reinforced concrete cantilever retaining wall rccrw is one commonly used soil retaining structure in engineering practice.