CRSI’s Reinforcement Anchorage and Splices includes tables of required lap splice lengths based on these variables. lap siding requires the use of a starter strip to set the first course on the proper angle and to create a drip edge. The length of the lap varies depend on concrete strength, the rebar grade, size, and spacing. Abstract: Noncontact lap splices are common in reinforced concrete construction and, although the ACI Building Code allows use of the spaced splices, design guidelines are limited. Lap siding installed over walls constructed of concrete masonry units complying with ASTM must C90 be applied in accordance with Tables 5 through 1 The 0. It is recommended that further investigation of the influence of the proportion of bars lapped at a section on splice performance be undertaken. Lap Splices A lap is when two pieces of reinforcing bar (rebar) are overlapped to create a continuous line of rebar. Therefore, the outcome raises the question of the validity of reductions permitted by both the ACI 318-08 and European (EC2) codes, where only a portion of the bars is lap-spliced at a section. Staggered laps were found to be weaker but fail in a less brittle manner when splices are staggered longitudinally as compared to equivalent laps, in which all bars are spliced at the same section whether or not bars were bundled. The results show that the bond strength of individual bars is not reduced on account of their forming part of a bundle (contrary to the provisions of ACI 318-08). Required lap length varies based upon bar size, masonry strength, and cover over the reinforcement. This paper reports an investigation into the performance of lap splices of individual bars within a bundle of two or three. The global slip over the lap splice length comprises the fixed-end slip at the column-footing interface, the slip attributable to yield penetration into the. Lap lengths in the 2002 Building Code Requirements for Masonry Structures reported by the Masonry Standards Joint Committee (MSJC), and the 20 editions of the International Building Code (IBC), have increased over previous editions. Keywords: bond strength brittleness bundles lap splicesĮuropean (EC2) and ACI 318-08 design code rules for lap splices of reinforcing bars within a bundle differ markedly-the former permits the same or shorter lap-splice lengths with respect to splices of individual bars, while the latter requires longer laps.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |