$$ A_{req'd}= \frac{10\text{ kip/ft} + 12.5 \text{ kip/ft}}{5000\text{ psf} -150\text{ psf} - 4 \text{ ft}\times 120 \text{ pcf}} = 5.15 \frac{\text{ft}^2}{\text{ft}} $$ We thus select a footing width of 62 inches or 5.17 ft. The design of retaining wall almost always involves decision making with a choice or set of choices along with their associated uncertainties and outcomes. Design Example 2 Reinforced Concrete Wall with Coupling Beams OVERVIEW The structure in this design example is a six-story office building with reinforced concrete walls as its seismic-force-resisting system. This mostly comes from the confinement factor, since our footing has large cover and spacing between bars this greatly benefits the development length. 2020. Determine the factors of safety against sliding and overturning. Reinforced Concrete Cantilever Retaining Wall Analysis and Design (ACI 318-14) Reinforced concrete cantilever retaining walls consist of a relatively thin stem and a base slab. o.c. Still need help? The Seismic Design Category is Category D. Reinforced masonry design requires that a grout/reinforcement spacing be assumed. ClearCalcs Soil Bearing. We compare this to the distance to the critical section: $$ \frac{B}{2}-\frac{b}{2} = \frac{5.17 \text{ ft}}{2}-\frac{1 \text{ ft}}{2} =2.09 \text{ ft} = 25 \text{ in} $$ Since 25 inches is larger than 21.9 inches, we know our bars are developed as required. Design the reinforcement in the wall at its base and mid-height. As a result, the concrete cannot develop the compression force required to resist the given bending moment. Reinforced Concrete Shear Wall Analysis and Design A structural reinforced concrete shear wall in a 5-story building provides lateral and gravity load resistance for the applied load as shown in the figure below. It also reduces the applied shear load since we are taking our critical section further away from the wall face. With ClearCalcs, it is just as easy to perform the more detailed calculations of development length, so this is what to do to provide safe and economical designs. At the base of footing the allowable soil pressure is 5000psf and base of footing is 5’ below the existing ground surface. An 8-in. o.c. ²î`bŠ“sø'D”»?¶î07v¤ÐÎÁxƄh‡¿éóê¾È»KÅ^Žšô5ü^¼ w&Âõ>WÐ{²þQà?¼riJ@íÓd ‹Íêç“àÖ. The need for both limit states design methods and working stress design methods in reinforced concrete is perhaps most evident if we look at slender walls as addressed by the American Concrete Institute’s ACI 318-11, section 14.8. The slab has to carry a distributed permanent action of 1.0 kN/m2 (excluding slab self-weight) and … US Concrete Wall Footing - Design Example Problem Statement. The base is divided into two parts, … soldier pile walls berliner wall deep excavation. In this example, the structural design of the three retaining wall components is performed by hand. Once we have this, we can calculate the self-weight: $$ SW = 12 \text{ in} \cdot 150 \frac{\text{lb}}{\text{ft}^3} = 150 \text{ psf} $$ Once we know the self-weight, we immediately remove it from the allowable bearing pressure, together with the weight of the soil above the footing, and then divide the total load by this adjusted bearing pressure to find the required area. Powered by Help Scout. We are using a No.4 bar with large spacing, so we can use the least conservative formula as per the table. DESIGN EXAMPLE. Reinforced Concrete Design Examples Example 3: Design of a raft of high rise building for different soil models and codes ... As a design example for circular rafts, consider the cylindrical core wall shown in Figure (35) as a part of five storeys-office building. The 2012 edition of the Reinforced Concrete Design Manual [SP-17(11)] was developed in accordance with the design provisions of ACI 318-11, and is consistent with the format of SP-17(09). Had this not been the case, we could have used hooks at the ends of the bar to significantly reduce the development length, or made use of the more detailed calculations which can be less conservative and more accurate. As previously discussed, shear reinforcement is usually avoided in footings and the concrete strength was already specified, so we choose to increase the thickness. In the example, they first try with a 12 inch thick footing. Checking in ClearCalcs, we can see that a 5.17 ft wide x 1 ft thick footing efficiently makes full use of the bearing capacity. The fluid level inside Assume a grout spacing of 48 in. The stem may have constant thickness along the length or may be tapered based on economic and construction criteria. Note that we automatically calculate the depth to reinforcement - thus the increase in $d$ from using a smaller bar is automatically calculated which provides us with slightly more capacity! All that's left here is to find the size and spacing required. How to Design Concrete Structures using Eurocode 2 A cement and concrete industry publication. EXAMPLE 11 - CAST-IN-PLACE CONCRETE CANTILEVER RETAINING WALL 2 2020 RESISTANCE FACTORS When not provided in the project-specific geotechnical report, refer to the indicated AASHTO sections. Shear wall section and assumed reinforcement is investigated after analysis to verify suitability for the applied loads. This is a very thorough textbook on reinforced concrete and we recommend it as a reference for concrete design in the United States. Reinforced Concrete 2012 lecture 13/2 Content: Introduction, definition of walls 1. Two equations are … Design of Boundary wall spreadsheet. Design a reinforced concrete to support a concrete wall in a relatively large building. Wall: 12-in. Shear connection between columns and walls and between walls concreted in two different … This is because these weights are cancelled out by their corresponding upwards soil reaction when considering the footing as a free-body. DESIGN EXAMPLE. For simplicity, we use Table 25.4.2.2, which gives a simple equation to calculate the development length. We pick a 13-inch thick footing and repeat the previous steps: $$ \begin{aligned} d &= 9.5 \text{ in} \\ V_u &= 8.01 \text{ kip/ft} \\ \phi V_c &= 9.37\text{ kip/ft} \end{aligned} $$ We see that the 1-inch increase both decreased $V_u$ and increase $\phi V_c$ as we liked.
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