![]() Shows that a second-order polynomial can be developed for which the required area of steel ( A s) can be solved by substituting M u for M n. Regarding the reinforcement, contemporary texts offer elaborate approaches for determining how much steel to use, and computers can make the trial-and-error process relatively quick and painless. As for the width, good proportioning of sizes will often show that widths between one-half and two-thirds of the depth are often appropriate. ![]() This is good precedent for beginning a beam design. You may recall that for a simply supported beam having a total height ( h) not less than span/16, deflection calculations may be omitted. When sizing a beam, it is advisable to start with the ACI provisions for span-to-depth ratios. ![]() Quite simply, the required area of steel is approximately equal to the factored moment (in kip-feet) divided by 4 d, where d is the effective depth from the extreme compression fiber to the centroid of the tensile reinforcement (in inches). This article seeks to address and elaborate upon a few of the simplified methods commonly used for reinforced concrete.įirst, consider the familiar A s~ M u/4 d approach that is commonly used in the design of reinforced concrete beams. Although they should not become the final basis of design, they can serve as effective tools to corroborate more detailed calculations or to estimate geometries, sizes and proportions as part of a preliminary or schematic design. I have also come to understand that, like many other materials, there are simplified approaches for reinforced concrete design. I eventually came to understand that the concepts that pertain to these elements also permeate nearly every aspect of reinforced concrete design, from footings to shear walls. Among the skills that I gained as an undergraduate were the basics of reinforced concrete design, including beams and columns. I simply mean that a four-year college experience laced with a generous dose of liberal arts education requirements barely compares to the experience and learning that take place in actual practice. With this statement, I do not mean to diminish the quality of my education, nor the dedication or expertise of excellent professors. I recall finishing my bachelor’s degree and having a skill set that, in retrospect, might be described as “barely sufficient”. If you are like me, you emerged from your collegiate experience with a broad array of fundamental tools in structural design that, hopefully, armed you adequately for your chosen career. ![]()
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