Functions of deformation joints what are the types

2022-07-22
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We seldom hear about deformation joints in our life, and they are often used in construction sites. Deformation joint is the general term of temperature joint, settlement joint and seismic joint. In industrial and civil buildings, due to the influence of temperature change, uneven settlement of foundation and earthquake, additional stress and deformation will occur in the building structure. If not handled properly, the building will be damaged, cracks or even collapse, affecting the use and safety

what should we do at this time? Deformation joints work: strengthen the integrity of the building, so that it has enough strength and stiffness to overcome these failure stresses without damage; Disconnect the structure at these deformation sensitive parts in advance, leaving a certain gap to ensure that each part of the building has sufficient deformation width in these gaps without causing damage to the building. This kind of reserved gap that separates the building vertically is called deformation joint. Next, Xiaobian will introduce the function of deformation joint in detail

[structure of deformation joint]

1. Set double walls or columns on both sides of the deformation joint &mdash& mdash; The method is relatively simple, but it is easy to make the structural foundation on both sides of the joint eccentric (when used for expansion joints, because the foundation can be continuously opened, this problem can be avoided)

2. Use horizontal component cantilever on both sides of the deformation joint to pick out in the direction of the deformation joint &mdash& mdash; The foundation part is easy to be disengaged, and it is convenient to set joints, which is especially suitable for settlement joints

3. Use a simply supported horizontal member for transition treatment &mdash& mdash; It is mainly used for the overhead walkway connecting two buildings, but it should be used with caution in earthquake resistant areas

[types and functions of deformation joints]

deformation joints can be divided into expansion joints, settlement joints and seismic joints

1. Expansion joint: the expansion and contraction deformation of building components will occur due to the change of temperature, humidity and other factors. For this reason, vertical gaps are usually set at appropriate parts of the building to disconnect the wall, floor, roof and other components of the building from above the foundation, and separate the building into several independent parts. The joint set to overcome the excessive temperature difference can be continuously disconnected from the foundation top to the roof along the structure

2. Seismic joint: the joint set to make the building more regular and conducive to the seismic resistance of the structure, and the foundation can be continuously opened. Its setting purpose is to separate large buildings into smaller parts to form relatively independent earthquake proof units, so as to avoid the damage caused by the uncoordinated vibration of the whole building caused by the earthquake

in the seismic fortification area, settlement joints and expansion joints must meet the requirements of seismic joints

3. Settlement joint: refers to the building structural joint set to avoid the cracking of the wall or other structural parts caused by uneven settlement when the same building has a wide difference in height, the upper load distribution is uneven, or it is built on different foundation soils. The settlement joint divides the building into several sections, forming a system, which is not connected from the foundation, wall, floor to the roof. The seam width is generally 30~70 mm. A vertical joint that completely separates a building or structure into sections from the foundation to the top. So as to avoid cracks caused by uneven subsidence of each section. It is usually set between the parts of the building with great differences in height, load or foundation bearing capacity, as well as at the connection of new and old buildings

conclusion: the above introduces the function of deformation joint, and I hope it will be helpful to you. For more relevant knowledge, please continue to pay attention to the information platform. More wonderful content will be presented for you in the follow-up

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