How to determine the percentage of longitudinal steel lap joint

The lap percentage is the percentage of rebar joints in the same lap section to the number of rebar roots. Suppose a beam has 8 20 steel bars, if there are 2 laps in the same section, the percentage is 25%, if there are 4, it is naturally 50%.

First calculate the lap length of the steel bar you use, according to the requirements of the drawings (the drawings do not require the atlas number to be used, find out from the atlas) anchorage multiple country la, find out the lap multiple lae, when the joint rate is 25%, lae=la*; lae=la* at 50% splicing ratio, lae=la* at 100% splicing ratio.

One lap section = rebar lap length * times.

In fact, under normal circumstances, the anchorage and lap multiples will be given on the drawing, so you don't need to calculate the percentages yourself.

03j has a general 31d on it

By: 281344959 - Level 4.

I rely on such as this line of the landlord means that the allowable range of the rebar cold lap is not it? But it's all cold tied Who said that only a lot of percent is allowed Just look at the lap rate more than a lot Add the corresponding coefficient in front 100% lap is a multiple coefficient!

100% lap coefficient of reinforcing bar! Hello, I am glad to answer for you<> the 100% lap coefficient of the pro-steel bar is the diameter of the steel bar d15, which is the 100% lap coefficient. The length of the rebar lashing lap is equal to the anchorage length la(lae) multiplied by the correction coefficient of the base, and the percentage of the area of the rebar lap joint is as follows:

The coefficient less than or equal to 25% is; 50% is; 100% is another different diameter of steel bars laughing hole lap according to the small diameter of the steel bar, in any case the lap length shall not be less than 300mm. Specification 1: When the steel bar is 100% lapped, the distance between the two joints with the longest distance among all the steel joints, the lashing lap does not exceed the lap length, and the welding and mechanical connection does not exceed 35d Specification 2:

The length of 100% lap of steel bars generally refers to the lap length specification of Lao Shengjin steel bar binding connection: when the steel bar is 100% lapped, the mechanical reinforcement joint is used, and the position of the stressed steel bar joint should be staggered accordingly, and the non-welded lap joint is used, hoping that I can help you <>

Do you have any other questions?

Refers to the percentage of the area of the longitudinal reinforcement lap joint in the same connecting section, which is the ratio of the cross-sectional area of the longitudinal stressed reinforcement with connecting joints to the cross-sectional area of all longitudinal reinforcement in the section.

Length of connecting sections: lashing lap is; 35d for mechanical connection; Welded to 35d and 500.

ll＝ζl la。

d is the small diameter of two interconnected steel bars; When the length of the connection section is calculated differently for different connection reinforcements in the same component, the larger value is taken. All joints, midpoint, located within the length of the connection section, the connection joints belong to the same connection section.

Steel bar, also known as grained steel, is a strip of steel that is a type of building material. For example, in reinforced concrete, it is used to support the skeleton of the structure. [2] Including round steel bars, ribbed steel bars, and torsion steel bars.

There are many types of steel bars, which are usually classified according to chemical composition, production process, rolling profile, form, diameter size, and use in the structure.

Steel bars are mainly subjected to tensile stresses in concrete. Due to the action of ribs, the deformed steel bar has a greater bonding capacity with concrete, so it can better withstand the action of external force. Steel bars are widely used in various building structures, especially large, heavy, lightweight, thin-walled and high-rise building structures.

The percentage of rebar lap joints is also the percentage of longitudinal rebar lap joint area. It refers to the ratio of the longitudinal reinforcement cross-sectional area of all connecting joints to the cross-sectional area of all longitudinal reinforcement bars in the same connection section.

There are three cases of the staggered lap percentage of rebar:

1.Percentage of staggered lap joints of rebar: 25%. It is mostly used for slabs, walls and other components. The following is a vertical view:

The diameter of the steel bars in the figure is the same, and there are 8 steel bars in the same connection area, 2 of which are in the same connection section.

2.Staggered lap rate of reinforcement: 50%. It is mostly used for columns, beams and other components. As shown below:

The reinforcing bars in the figure have the same diameter, and there are 8 rebars in the same connecting area, and 4 of them are in the same connecting section.

3.Staggered lap rate of steel pure ruler with reinforcement: 100%. It is mostly used for post-pouring tape. As shown below:

When the rebar is connected, there is no need to stagger the joint position, and all the rebar is overlapped at the same position.

For details on how to lap rebar, please refer to pages 2-4 of the 22G101-1 atlas.

The lap length of the reinforcement can refer to page -6 of 22G101-1.

The joint position of the secondary beam and the reinforcement is detailed in the construction of the non-frame beam. In 22G101-1 Atlas 2-40 pages.

When we build a house, we will first use steel bars to build a rough frame, and then fill the materials in turn according to the frame, then, some people do not know the steel bar lap.

What is the percentage, this is very unfamiliar, because of the fact that there will be doubts in the process of construction. When we build a house, we will first use steel bars to build a rough frame, and then according to the frame of the build in turn to fill the material, then, some people do not know what the percentage of steel lap is, this is very unfamiliar, so there will be doubts in the process of construction, and do not understand what are the requirements for steel lap, this needs to be known in advance, let's learn about it together.

What is the percentage of rebar lap

Refers to the proportion of the internal joint reinforcement to the total reinforcement (refers to the longitudinal reinforcement.

It can be expressed by the formula as: longitudinal reinforcement joint.

Percentage (cross-sectional area of longitudinally jointed reinforcement on the cross-section of the component at which the rebar joint is located, the total cross-sectional area of all longitudinal reinforcement bars) 100

The percentage of rebar lap joint area is the percentage of the number of lap bars in the same lap section to the total quantity. That is, at the same cross-sectional position (perpendicular to the direction of the reinforcement), the reinforcement area of the joint accounts for half of the total reinforcement area. For example, the percentage is 50, that is, 5 of the 10 steel bars are connected in the same place, that is, 5 heels, and the other 5 must be 1 3 times the lap length before they can be lapped.

Rebar lap requirements

1) The distance between the end of the lap length and the bending place of the steel bar shall not be less than 10 times the diameter of the steel bar, and the joint should not be located at the bending moment of the component;

2) In the tensile area, the end of the I-grade steel bar binding and joint length should be hooked, and the bureau-grade steel bar can not be hooked;

3) The end of the compression grade I steel bar with a diameter equal to or less than 12mm, and the end of the stressed steel bar of any diameter in the axial compression member, can not be hooked, but the lap length should not be less than 35 times the diameter of the steel bar.

The lap joints of the steel bars should be firmly tied with iron wires in the center and at both ends. The positions of the lashing joints of the stressed steel bars should be staggered from each other. From the center of any lashing joint to the length of the lap joint z, there is a stressed steel bar of the binding joint within the range of 1 3 times the section, and its cross-sectional area accounts for the percentage of the total cross-sectional area of the stressed steel bar as follows:

The tension area shall not exceed 25; The compression zone must not exceed 50.

After reading through the introduction of this article above, we already know what the percentage of steel lap is, and the above has told you the answer, so that we can quickly solve this problem in the process of construction, and also know what the requirements for steel lap are, we must be familiar with these requirements, which are very important, and must be carried out in strict accordance with the requirements during construction.

Summary. This question is up to me, it takes a little time to type, so please be patient.

How to calculate the percentage of the area of the longitudinal reinforcement lap joint.

This question is up to me, it takes a little time to type, so please be patient.

The white fraction rate of the joint area is divided by the ratio of the number of lap roots of the longitudinal tensile steel bar on the same section of the component divided by the total number of tensile steel bars: if the tension longitudinal bar in the middle section of the simply supported beam is 4 at the bottom, if there are 2 lap joints here, it is 50%, and 1 lap is 25%. It is the distance between the centers of the lap length segment, and the percentage on the basis of the lap length must be ensured.

That is, within a certain length, the longitudinal reinforcement with joints accounts for the percentage of all longitudinal reinforcement. For example, if you have seen the reinforcement welding of the column, it is stipulated that 50 area area division is required, that is, within a certain length, the column reinforcement is only 50 at most in this area of the reinforcement to leave joints.

For example, there are 4 longitudinal bars in the same cross-section, (the cross-sectional areas of these four bars are not necessarily equal), assuming that the area of each bar is A, B, C, D respectively. If the area of a and b, the two steel bars are overlapped, and the percentage of the area of the longitudinal steel bar lap joint = (a+b) (a+b+c+d) 50% of the lap joint.