Recommended LRFD Minimum Flexural Reinforcement Requirements (2010) / Chapter Skim
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6 CHAPTER 1 INTRODUCTION AND RESEARCH APPROACH 1.1 PROBLEM STATEMENT Minimum flexural reinforcement is prescribed in the AASHTO LRFD Bridge Design Specifications (also referred to as the "LRFD specifications") for reinforced and prestressed concrete members to reduce the probability of brittle failure (AASHTO, 2007)
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7 corresponds to Mn in Figure 1. This observation also implies that minimum reinforcement provisions in the current LRFD specifications applied inconsistently for reinforced compared to prestressed concrete members.
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8 Figure 2. Load-displacement response of an interior span of a continuous member 1.2 RESEARCH OBJECTIVES The objective of this research is, to develop recommended revisions to the AASHTO LRFD Bridge Design Specifications and Commentary for rational design of minimum reinforcement to prevent brittle failure of concrete sections.
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9 Task 1. Review U.S.
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10 1.4 RESEARCH WORK PLAN The work plan identified in Task 6 was developed to achieve the objectives of this project after the data collection phase of this project. This work plan consisted of the following items: 1.4.1 Refine the Modified LRFD Method A new approach to determine minimum reinforcement is proposed to meet the objectives of the NCHRP 12-80 project.
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11 To evaluate the appropriateness of the statistical parameters, the cumulative distribution function (CDF) of the modulus-of-rupture is plotted on the normal probability paper.
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