![]() ![]() The lapping length provided must not be less than 75 mm.The rebars are staggered and lapped correctly so that they maintain the clear cover of the column.The lapping must be provided alternatively so that the lapping of adjacent rebars does not come in a sequence.The lapping must not be performed at the column-beam junction because the area experiences maximum stress.When bars of two different diameters are to be lapped, the lap length is calculated for the bar with the smaller diameter.As per the ductile reinforcement concept, closely spaced special confined reinforcement is also provided at a distance l o from the top and bottom of the column, as shown in Figure-3. The lateral reinforcement or the links are provided closely in the lap length region.This value is considered if the structural designer does not provide a lap length value. The general lap length for column reinforcement is the greater of development length L d and 30d, where ‘d’ is the diameter of the reinforcement bar.Lapping is not provided on the tension zones (Zone-A).For larger bars, connections can be made either using welding, couplers, or welding with helical reinforcement. Lapping is not used for bars greater than 36 mm.length in table shall be factored for the following conditions horizontal bars more than 12' above bottom of cast member: 1.3xtable length light weight concrete: 1. The important considerations on length, location, and position of lap splices as per IS 456-2000, clause.26.2.5.1 are explained below. length shown conform to non -seismic provisions of aci 318 for uncoated bars enclosed by properly spaced ties or stirrups 2. These zones are classified in order to provide special confining reinforcement as a part of ductile detailing of R.C.C columns. In such a lap splice, two culms are overlapped by at least one internode and lashed together at two or three locations. 20.26 (a)) are the most basic type of this connection ( Jayanetti and Follet, 1998). Then the height of Zone-B is given by (h c- (h/4 + hc/4)) = h c/2. Traditional joining methods rely principally on lashing (Group 3) with or without dowels (Group 4B) lap-splices ( Fig. Figure-3: Column Detailing and Lapping Zone as per IS 13920-1983Īs shown in Figure-3, if the clear distance of the column is h c, then Zone-A has a length of h c/4.
0 Comments
Leave a Reply. |
Details
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |