What is frame-shear wall structure and what are its characteristics?

Every time we see high-rise buildings, many of us like to comment. How is the design of this building? Why are the designs of these buildings all the same? In fact, there are many forms of building structure design, and frame-shear wall structure is one of them. So, what is a frame-shear wall structure? What are the advantages and disadvantages of frame shear wall structure? < < < Click here to get free room measurement by professional designers > > >

what is a frame shear wall?

before introducing what is a frame-shear wall structure, let's understand what is a shear wall structure. Shear walls, also known as wind-resistant walls or earthquake-resistant walls, are mainly used to bear horizontal loads caused by wind loads or earthquakes in building construction and prevent structural shear damage. They are divided into plane shear walls and three-dimensional shear walls, which are generally made of reinforced concrete and cast-in-place reinforced concrete.

let's learn about the frame structure. Frame structure refers to the structure composed of beams and columns connected by rigid joints or hinges, which constitutes a load-bearing system, that is, the frame composed of beams and columns resists both horizontal and vertical loads in use. The structure of the building wall is not load-bearing, but only plays the role of enclosure and separation.

what about the frame-shear wall structure? Frame-shear wall structure is also called frame-shear wall structure. Literally speaking, a certain number of shear walls are arranged in the frame structure to form a flexible and free use space. The stress characteristics are composed of two different lateral force resisting structures, namely frame and shear wall structure. The interaction between frame and shear wall makes the whole frame-shear wall structure more stable.

Advantages and disadvantages of frame-shear wall structure:

Advantages:

(1) The frame structure is flexible in architectural layout and can form a larger space, but its ability to resist horizontal load is poor, while the shear wall structure is the opposite.

(2) Frame-shear wall structure combines the two to learn from each other.

(3) Shear walls are arranged between some columns of the frame, thus forming a structural system with large bearing capacity and flexible architectural layout. In this structure, the frame and shear wall work together, the frame mainly bears vertical load, and the shear wall mainly bears horizontal load.

scope of application of frame-shear wall structure: this structure is generally suitable for buildings with 1-2 floors.

1. Frame structure

Advantages:

(1) Flexible space separation and light weight, which is beneficial to earthquake resistance and saves materials;

(2) It has the advantage that it can flexibly cooperate with the layout of buildings, which is conducive to the arrangement of building structures that need more space;

(3) The beam and column members of the frame structure are easy to be standardized and finalized, and it is convenient to adopt the assembled integral structure to shorten the construction period;

(4) When the cast-in-place concrete frame is used, the integrity and rigidity of the structure are good, and the seismic effect can be achieved if the design is handled well, and the beam or column can be cast into various required cross-sectional shapes.

Disadvantages:

(1) The stress concentration of frame joints is obvious;

(2) The lateral stiffness of the frame structure is small, which is a flexible structure frame. Under the strong earthquake, the horizontal displacement of the structure is large, which is easy to cause serious non-structural failure;

(3) The consumption of steel and cement is large, the total number of components is large, the hoisting times are large, the workload of joints is large, and there are many processes, which wastes manpower and the construction is greatly affected by seasons and environment;

application scope of frame structure: it is not suitable for building high-rise buildings, but generally suitable for building houses with no more than 15 floors.

2. Shear wall structure

Advantages:

(1) Good integrity;

(2) the lateral stiffness is large, and the lateral displacement is small under the action of horizontal force;

(3) Because there are no beams and columns exposed and protruding, it is convenient for the interior layout of the room.

Disadvantages:

(1) Can't provide a large space house;

(2) The ductility of the structure is poor.

scope of application of shear wall structure: shear wall structure can bear vertical force and horizontal force, and has high lateral stiffness, so it can build a building with more floors than frame structure. However, only small rooms can be used as the main houses, such as houses, hotels and single dormitories. In hotels, foyers, restaurants, shopping malls and so on, which need large space, are often set in other building units. Generally, it is applicable within 3m height.

Layout principle of frame-shear wall structure:

Principle 1. Frame-shear wall structure should be designed as a two-way lateral force resisting system, and it is not suitable to use hinge between main structural members. In seismic design, shear walls should be arranged in both principal axes. The center line of beam and column or column and shear wall should overlap, and the eccentricity between beam and column center line of frame should not be greater than 1/4 of column width.

Principle 2. The layout of shear walls in frame-shear wall structures is generally in accordance with the principle of "uniformity, symmetry, dispersion and periphery":

(1)? Shear walls should be evenly and symmetrically arranged near the periphery of buildings, elevator rooms, and parts with large plane shape changes and dead loads; Shear walls should not be set at both sides of expansion joints, settlement joints and seismic joint.

(2) When the plane shape is uneven, it is advisable to arrange shear walls near the ends of the protruding parts.

(3) When arranging shear walls, if it is impossible to set shear walls in one direction, such as vertical or horizontal, wall-type frames or supports can be used in this direction, but the displacement values in the two directions under the action of horizontal force should be close. The seismic grade of wall frame should be considered according to the seismic grade of shear wall.

(4) The layout of shear walls should be evenly distributed, and the stiffness of single wall should be close. The long shear walls should be provided with holes and coupling beams to form a double-limb wall or a multi-limb wall, and the length of the wall limb of a single-limb wall or a multi-limb wall should not be greater than 8? m。 The shear force generated by the horizontal force at the bottom of each shear wall should not exceed 4% of the total shear force at the bottom of the structure.

(5) The longitudinal shear wall should be arranged in the middle section of the structural unit. When the longitudinal length of the building is long, it is not advisable to concentrate on arranging longitudinal shear walls at both ends, otherwise, post-cast strips should be set at appropriate positions in the plane to reduce the influence of shrinkage stress during concrete hardening, and roof insulation should be strengthened to reduce the influence of temperature change.

(6)? When a staircase or shaft causes a hole in a continuous floor, it is advisable to set a shear wall at the edge of the hole, and try to combine it with the nearby lateral force resisting structure, and it is not advisable to arrange it in the middle part outside the single lateral force resisting structure or column network in isolation.

(7)? The spacing between shear walls should not be too large, and it should meet the requirements of floor plane stiffness, otherwise the influence of floor plane deformation should be considered.

principle 3. the shear wall in the frame-shear wall structure should be designed as a framed shear wall with beams and columns (or hidden beams and columns) around it. Adjacent shear walls in vertical and horizontal directions should be connected together to form L-shape, T-shape and mouth shape, so as to increase the stiffness and torsion resistance of shear walls.

Principle 4. In a building with a long rectangular plane or plane, the layout of shear walls should meet the following requirements:

(1) When there is a large opening in the floor between shear walls, the spacing between shear walls should be reduced.

(2) The longitudinal shear wall should not be centrally arranged at both ends.

principle 5. the shear wall should run through the whole height of the building, and the thickness of the wall along the height should be gradually reduced to avoid sudden stiffness change. When the shear wall can not be completely penetrated, the stiffness of adjacent floors should not be weakened by more than 3%, and the structural measures should be strengthened according to the requirements of the transfer floor in the floor slab with sudden stiffness change.

That's all about what frame-shear wall structure is and its advantages and disadvantages. These contents are necessary for architectural designers, but they are not often heard by people who are not familiar with this industry. Interested friends can learn about it. < < < Click here to apply for decoration insurance for free, so as to avoid the decoration trap > > >

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