Minimum Requirement for Lap Splice Lengthīoth types of lap splices have a minimum splice length requirement as follows: Lapped Splices for Multiple Concrete Pours The reinforcing bars are allowed to be spaced at a distance of one fifth (1/5) of the lapped length to a maximum of 150 mm or 6 inches. The lapped reinforcing bars MUST be in contact with each other and secured together. There are two main types of lap splices: Contact Lap Splice The length of the splice should be calculated according to the local building codes or by a local engineer and specified on the project plans. Lap splicing is typically overlapping reinforcing steel over a certain length. Types of Lap Spliceįor the purpose and scope of this manual we will only discuss one type of splicing known as lap splicing. The main purpose of the splice is to transform the stresses whether tensile or compression from one steel reinforcing bar or a group of bundled bars to another in a manner to satisfy the governing local building/engineering codes and/or requirements of engineering plans and specs. In such cases where steel reinforcement is required to exceed this length, then a splice is required. Steel reinforcement typically comes in 20 foot (6 meter) lengths. Window and door headers also known as lintels can be subjected to significant bending moment and shear forces depending on several factors. Creating a wall opening in a reinforced concrete wall creates extra stress around that opening especially at the corners. Most walls will have window or door openings or both. Vertical reinforcement bars are slid into place from the top and weaved into the horizontal reinforcement and secured into the proper place according to the project plans and specs. In case of a multistory wall then the vertical reinforcement is placed after the erection of each individual storey. Vertical reinforcement is placed after the wall has been stacked and completely erected. below grade and above grade applications using 8" respectively. This staggered pattern of horizontal reinforcement is necessary to allow for the vertical reinforcement to be placed from the top and weave in between the horizontal steel bars. The fourth course is placed in the same position as the second. The third course is placed in the same position as the first course. The second course of horizontal reinforcement is staggered so that it is placed in the notch towards the center of the concrete wall. Typically the first course of horizontal reinforcement is placed in the notches closer to the EPS panel. Below is the placement of reinforcement in Shear Walls Horizontal ReinforcementĪmvic polypropylene webs are specifically designed to accommodate and secure the horizontal reinforcing steel in place without the need to tie them. Reinforced concrete structures have had a tremendous track record in some of the most complicated structures including dams, bridges and high rise buildings across the globe. The design of reinforced concrete structures have been streamlined particularly over the last century for safety as well as economic feasibility. Therefore reinforced concrete structures are typically designed by engineers such that concrete is mainly utilized for most of the compressive forces and reinforcing steel is utilized for all of the tensile forces and in some cases some of the compressive forces. Reinforcing steel has excellent strength in both compression and tension loads but is more expensive than concrete. However plain concrete is relatively weak in tension (typically can only carry one tenth (1/10) of its compression strength in tension). Compressing a plain concrete cube or cylinder requires a relatively large amount of compressive force before reaching compression failure. Plain concrete is a strong material in compression. Reinforced concrete structures are composed of two different materials The designer should specify the lap splice type and lengths for every section of the wall where splicing is anticipated.off center or towards interior/exterior or centered in the wall). The placement of reinforcing steel, especially the vertical ones should be clearly marked (i.e.Vertical and horizontal reinforcing steel bar sizes, spacing and grade of steel should be clearly marked for every storey in each wall cross section or in a separate note on other sheets.Each cross section should show the wall heights involved for every storey.4, 6, 8, or 10 inch) for the building inspector and installer. Each cross section should clearly show the size of block used (i. The designer (Architect/Engineer) of any project should clearly indicate the following information on his plans:
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