Cara Cepat Menentukan Tulangan Kolom Rumah 2 lantai dan 3 lantai

Summary

This video explains the process of determining the number and size of reinforcement bars (rebar) in columns for 2-3 story residential buildings. It highlights key concepts such as the relationship between the forces acting on a structure (moment and shear) and the requirements outlined in SNI 2847:2019. The presenter calculates the necessary rebar using a 2% ratio for a 22x22 cm column, resulting in a need for 8 main reinforcement bars. Additional details cover common practices for stirrup sizes and spacing, and SNI guidelines for using deformed steel rebar. The video aims to provide practical insights into structural reinforcement design.

Takeaways

• 😀 The video explains how to quickly determine the amount and size of column reinforcement for buildings, particularly for 2/3-story houses.
• 😀 The design of column reinforcement and structure should be based on forces acting on the element, especially bending and shear forces, which are obtained through structural analysis.
• 😀 According to SNI 2847:2019, the minimum reinforcement area should not be less than 1% and should not exceed 8% of the column's gross cross-sectional area.
• 😀 Based on past experience, the reinforcement for 2/3-story buildings is usually around 1.5% to 2% of the cross-sectional area.
• 😀 For a more conservative approach, the video uses a reinforcement ratio of 2% to calculate the required reinforcement area.
• 😀 In the example, for a column size of 22x22 cm, the gross cross-sectional area is 484 cm². The required reinforcement area is 2% of this, which equals 9.68 cm².
• 😀 The video then discusses determining the diameter of reinforcement bars. In this case, it uses a 13mm diameter bar and calculates how many are needed by dividing the required reinforcement area by the area of the 13mm bar.
• 😀 The area of a 13mm bar is 1.327 cm², so dividing the required reinforcement area by this gives 7.29 bars. This number is rounded up to 8 bars.
• 😀 The video also discusses the importance of shear reinforcement or stirrups, which are based on the shear forces acting on the column. However, common practice suggests using 8mm stirrups with a spacing of 150mm or 10mm stirrups with 200mm spacing.
• 😀 SNI standards require the use of deformed steel bars for main reinforcement, with a tensile strength of 400 MPa or 4 tons per cm², which is widely available in the Indonesian market in sizes like D13, D16, D19, D25, D29, and D32.
• 😀 The video concludes with a reminder about the importance of structural analysis and appropriate selection of reinforcement based on building type and size, ensuring the structure's safety and stability.

Q & A

What is the main topic discussed in the video script?

The video script discusses the process of determining the amount and size of reinforcement bars (tulangan) for columns, particularly for 2-3 story residential buildings.

How is the column reinforcement designed according to the script?

The column reinforcement is designed based on the forces acting on the structural element, especially the bending and shear forces, which are determined through structural analysis.

What does the SNI 2847 standard state about the minimum and maximum reinforcement for columns?

SNI 2847:2019 limits the minimum reinforcement to 1% and the maximum to 8% of the gross column cross-sectional area.

What is the typical reinforcement percentage used in 2-3 story buildings based on the experience mentioned in the script?

Based on the experience shared in the script, the reinforcement percentage typically ranges from 1.5% to a maximum of 2% for 2-3 story buildings.

How is the required reinforcement area calculated in the script?

The required reinforcement area is calculated by multiplying the gross column cross-sectional area by the selected reinforcement ratio, in this case, 2%.

What is the size of the column used in the example provided in the script?

In the example, the column size used is 22 cm x 22 cm, giving a gross cross-sectional area of 484 cm².

How is the number of reinforcement bars determined in the example?

The number of reinforcement bars is determined by dividing the required reinforcement area by the cross-sectional area of a single reinforcement bar (D13 in this case). This gives 7.29, which is rounded up to 8 bars.

What diameter of reinforcement bars is used in the example, and why?

The diameter of the reinforcement bars used in the example is D13 because this is commonly used for the required column size and strength.

What are the recommended diameters and spacing for stirrups (Sengkang) in the columns?

The script suggests using a D8 stirrup with a spacing of 150 mm or a D10 stirrup with a spacing of 200 mm based on previous experience for adequate performance.

What type of steel is required for the main reinforcement bars according to SNI 2847?

According to SNI 2847, the main reinforcement bars must be made of ribbed steel with a tensile capacity of 400 MPa (which equals 4 tons per square centimeter).