This module will cover the analysis and design of reinforced concrete beams and one-way slabs. Upon successful completion of this module, you will earn 3 hours of continuing education credits
Let us briefly discuss the two main learning objectives of this module.
The first objective is for the user to acquire a basic understanding of analysis methods for reinforced concrete beams and one-way slabs. Included a discussion on an approximate method that can use in lieu of a more exact analysis procedure or computer software.
The second learning objective is for the user to acquire. A basic understanding of the design requirements for flexure, serviceability, shear, and torsion. Included is information on code-prescribed requirements, simplified design methods, reinforcement detailing, and economical formwork.
Please note that this learning module focuses on analysis and design of concrete beams and one-way slabs that contain nonprestressed reinforcement only. The design of prestressed concrete members not covered in this module.
Analysis methods for concrete beams and one-way slabs will be presented first. As mentioned a moment ago, an approximate method will introduce that gives reasonably conservative values for typical concrete framing systems. Design requirements are presented next for flexure, serviceability, shear, and torsion. In general, provisions will presente on (1) how to size the cross-section,
(2) how to determine the required amount of reinforcement, and (3) how to detail the reinforcement. Design examples provide that illustrate the analysis and design methods noted previously. These completely worked-out example problems provide a better understanding of how to apply the code-prescribed requirements. Additionally, software solutions will provide, which can save time and effort. When analyzing and designing beams and one-way slabs. When the user feels confidant that he or she mastered the learning objectives of this module. A quiz can complete and submit. Successfully passing the quiz earns the user 3 hours of continuing education credit.
The information presented in this module base on the requirements. in the 2005 edition of ACI 318 Building Code Requirements for Structural Concrete. Since the Section numbers referenced herein are taken from this standard. It recommends that a copy of this publication is available for easy reference when going through this module.
Let us now begin our discussion with analysis methods for reinforced concrete beams and one-way slabs.
Chapter 8 in ACI 318-05 contains the general requirements for the analysis of any concrete structure. The first step in the frame analysis is the determination of service gravity loads and lateral loads, such as wind and seismic.
The general building code under which the project is to design and construct is to use to determine the service loads, lateral loads, and all other applicable loads on the structure. inin fact ASCE 7, Minimum Design Loads for Buildings and Other Structures, referenced in the latest edition of the International Building Code, which adopte in many jurisdictions throughout the U.S. For a specific project, however, the governing local building code should consulte for any variances from the IBC or ASCE 7.
since thoses Methods of analysis for reinforced concrete structures present in Section 8.3 of ACI 318-05. Factored loads service loads multiply by appropriate load factors, which gave in Section 9.2. These load factors will discuss later. For the strength design method. An elastic analysis uses to obtain bending moments, shear forces, and other reactions. The assumptions that specify in Sections 8.6 through 8.9 may use in such an analysis. Let us now briefly go over those assumptions.
The first assumption has to do with member stiffness. Ideally, flexural and torsional stiffnesses should reflect the degree of cracking and inelastic action that occurred along the length of each member before yielding. Determining these quantities in even a relatively simple frame is very complex. Such a procedure is not efficient for use in design offices. Thus, simpler assumptions require to define flexural and torsional stiffnesses
For braced frames, one of two sets of usual assumptions are made for stiffness. first of all, the gross flexural stiffness values used for all members, while in the second set, half of the gross flexural stiffness of the beam stem for beams and the gross flexural stiffness for the columns used.
Let us now move on to the second analysis assumption, which has to do with span length. When determining bending moments in frames or similar types of continuous construction, the span length shall take as the distance between the centerlines of the supports.