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Rebar Embedment Length |
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Rebar Embedment Length |
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Rebar Embedment Length
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Rebar Embedment Length |
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Rebar Embedment Length |
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This program calculates embedment and splice lengths for deformed steel rebar in concrete. Since typical embedment lengths are readily available in tables, this program is primarily for developing tables of embedment lengths when unusual conditions effect the lengths
Two major categories of embedment calculation are available; straight embedment and hooked embedment. The program calculates the basic tension embedment length for straight and hooked cases, and compression embedment for straight cases only.
This program also lists required lap splice lengths for Class "A" and "B" splices.
Basic Usage
| • | This program provides five columns to specify different rebar sizes and embedment conditions. The entry descriptions below apply to all columns. |
| • | Enter Bar Data. Rebar size # (in 1/8th inch increments), f'c, and Fy. |
| • | Enter Modification Factors. Here you can specify whether the cover and spacing requirements of ACI 12.2.3 are satisfied, whether lightweight concrete is used, bar location, excess steel area ratio, or if the bars are enclosed in spirals. The answers to these items will be used to apply factors to the basic embedment lengths for determining the final Modified embedment lengths. |
| • | The minimum embedment lengths are calculated for both straight and hooked conditions. If your actual construction details provide only limited embedment lengths, you can modify the various factors and recalculate until the desirable lengths are attained. |
Unique Features
To reduce the infrequent task of calculating specialized rebar embedment lengths, this program brings together all the code requirements of ACI sections 12.2, 12.5, 12.16, and 12.17 in a quick, concise, and flexible calculation tool.
Assumptions & Limitations
| • | Rebar areas are chosen from an internally stored table of values typically used in engineering practice. |
| • | Evaluation of embedment lengths and splices follow ACI. |
Example
The data entry for this example is shown in the screen captures that accompany the Data Entry Tabs and Results & Graphics Tabs sections to follow.
Data Entry Tabs
This set of tabs provides entries for all input in this calculation. While you are entering data and switching between these tabs you can view the desired resulting information on the tabs on the right-hand side of the screen (calculated values, sketches, diagrams, etc.). A recalculation is performed after any entry data is changed. After each data entry you can view the results on the right-hand set of tabs.
Rebar Size #
Enter the rebar size # which should be used for the analysis in each column.
f'c
Enter the 28 day concrete compressive strength in this location.
Fy
Enter the steel yield strength in this location.
Code Edition
Select between ACI 318-91 and several later code. This changes the look of the tab slightly to provide the proper items for the selected code.
Actual Rebar Area
Based upon the rebar size number entered immediately above, the typical area used in engineering practice is recalled from an internal table and shown here.
Straight Embedment
ACI 12.2.3
Enter the appropriate multiplication factor depending on how your reinforcing satisfies ACI section 12.2.3. This section is new in the 1989 code, and represents how rebar cover, spacing, and placement effect the required embedment lengths. These provisions are primarily aimed at limiting dangerous crack propagation to the concrete surface.
Lightweight Concrete
Enter 1.33" for lightweight concrete or 1.18" for sand lightweight concrete as defined by the ACI. For normal weight concrete, enter 1".
Top Bar Placement
Enter 1.4" if the rebar is located so that there is more than 12" of concrete below the bar (or other condition that would necessitate a top condition.
As Required / As Actual Ratio
When the required area of steel is less than what has been provided, enter the ratio of required/supplied area here.
Within Ties / Spirals
When the reinforcement is enclosed in a spiral not less than 1/4" diameter nor more than 4 in pitch, enter 0.75".
Hooked Embedment
Adequate Cover
Answer 1" if cover exceeds 2-½" normal to the plane of the hook, or 2" beyond the embedment of the 90 degree hook extension.
Lightweight Concrete
Enter 1.33" for lightweight concrete or 1.18" for sand lightweight concrete as defined by the ACI. For normal weight concrete.
Embedment Lengths
Tension
Basic Before Adjustments : The program calculates the basic tension embedment length per ACI section 12.3.3, but not less than 12".
Final After Adjustments : This value represents the Basic Tension Embedment Length multiplied by all of the adjustment factors specified above.
Compression
Basic Before Adjustments : The program calculates the basic compression embedment length ACI section 12.3, but not less than 8".
Final After Adjustments : This value represents the Basic Compression Embedment Length multiplied by all of the adjustment factors specified above.
Hooked
Basic Before Adjustments : The program calculates the basic tension embedment length per ACI section 12.3.3, but not less than 12".
Final After Adjustments : This value represents the Basic Tension Embedment Length multiplied by all of the adjustment factors specified above.
Splice Lengths
Splice lengths per ACI 12.15 for tension and ACI 12.16 for compression are calculated for the reinforcing.
Sample Printout
