Finally, recommendations were made to increase the maximum limit set forth in ACI 318-95 on the effect of transverse reinforcement on development length. Also, because the alternate detail provides a short lap splice in addition to the hooked anchorages, we believe it is superior to the common detail. ![]() Keywords: substandard lap splices, seismic strengthening, RC beams, CFRP. An equation was derived to predict spirally confined lap length. This paper investigates the bond behaviour of lapped steel bars using fifteen. An evaluation of nevelopment length and lap splices has been reported by Orangun et ale (3) This paper. Appendix A is a list of references covering the topic of lap splices. The investigation showed that spiral confinement of lap splices of standard reinforcing bars can result in significant reduction of the required lap length. A review of literature on lap splices of reinforcing bars indicates that very little work has been done to determine per formance under seismic loaning conditions. The results are compared with recently published research recommendations and with the ACI 318-95 provisions. Maximum axial load was recorded as the failure capacity of specimens’ cracking patterns was also observed. Parameters covered in this study include concrete strength, bar size, number of spirals, and lap length. ![]() In the second phase, the chosen splice detail was more extensively studied. The first phase focused on determining the best splicing detail. A total of 119 specimens were tested in axial tension in two phases. This paper presents an investigation of the behavior of spirally confined lap splices of deformed reinforcing bars in concrete. The 1989 Code clarifies this section on the basis that a compressive lap splice has a tension strength of at least one- quarter fy, which simplifies the. Keywords: concretes lap connections splicing. Standard Pool structural Plan.Author(s): Amin Einea, Sherif Yehia, and Maher K. The half lap splice joint is the simplest form of the splice joint and is commonly used to join structural members where either great strength is not required or reinforcement, such as mechanical fasteners, are to be used. It is my opinion that significant problems have not occurred from the use of contact lap splices because swimming pools are typically constructed with #3, grade 40 reinforcing bars that are easily encased by the gunite process for satisfactory re-bar development.ĭue to the substantial additional labor and resultant cost to install non-contact lap splices, it is this firms professional opinion that contact lap splices should be permitted for reinforcing steel installed in gunite swimming pools constructed from Pool Engineering, Inc. There are four main types of splice joints: half lap, bevel lap, tabled, and tapered finger. I believe that the pre-construction tests mentioned in IBC 1908.4.3 is, in reality, the hundreds of thousands of gunite swimming pools that have been built during the last fifty years without significant problems from the use of contact lap splices. Government agencies throughout California typically have permitted (and are continuing to permit) contact lap splices for gunite swimming pool construction. “the use of contact lap splices necessary for support of the reinforcing is permitted when approved by the building official, based on satisfactory pre-construction tests that show that adequate encasement of the bars will be achieved, and provided that the splice is oriented so that a plane through the center of the spliced bars is perpendicular to the surface of the shotcrete” Section 1908.4.3 of the International Building Code states: Splice lengths were increased to 24db for compression and to 36db for tension for Grade 60 column bars in the 1963 ACI code 1. This article is meant to provide information supporting the use of contact lap splices since the requirement for non-contact lap splices is somewhat unusual for swimming pool construction throughout the State of California. Many building inspectors have issued correction notices regarding the use of contact lap splices instead of non- contact lap splices in shotcrete and gunite construction in accordance with Section 1908.4.3 of the 2015 International Building Code (2016 California Building Code). The double pullout specimens were tested applying direct. It is common in swimming pool construction to lap slice reinforcing bar when a continuous bar is not feasible. Grade 400 deformed reinforcing bars with a 300 mm lap splice length were provided in all specimens.
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