Frame shear wall structure and its application in construction engineering

In order to alleviate the contradiction between limited land resources and population growth, the current urban housing construction is developing in the direction of high-rise, in order to resist horizontal loads, enhance the stability of buildings, and at the same time meet the diversification of people's use of buildings Demand, the current house building mostly uses the frame shear wall structure system. Under this background, it is of great practical significance to discuss the application of the frame shear wall structure construction technology in the building construction project.

Frame shear wall structure and its characteristics

1. The basic concept of frame shear wall structure

In the house building structure system, the common single system includes frame structure, shear wall structure, frame shear wall structure, barrel structure, etc., although the frame structure can provide a larger space for the building, but the lateral rigidity is small , The ability to resist horizontal loads is slightly worse; while the lateral rigidity of the shear wall structure is large, it has good resistance to horizontal loads such as earthquakes and wind loads, but the spatial layout of the shear wall structure is not flexible and self-important. The frame shear wall structure combines the advantages of both the frame structure and the shear wall structure. First, the frame shear wall structure has the advantages of large lateral rigidity and good stability of the shear wall structure. Second, it can also provide people with The large indoor space makes the space layout more flexible and meets the diversified demands of people on the function of the building.

In the frame shear wall structure, beams and columns are combined by rigid connection or articulation to form the frame of the structure, which is used to bear the vertical load of the building, and the horizontal load is borne by the shear wall.

2. Technical characteristics of frame shear wall structure

Force characteristics

Under the action of pressure and shear force, the frame structure shows that the upper floor has small deformation, the lower floor has large deformation, and the deformation curve is a shear type; the shear wall structure shows that the upper floor has large deformation, the lower floor has small deformation, and the deformation curve is The curved type; the frame shear wall structure combines the advantages of the two and avoids the shortcomings. Through the cooperation of the frame and the shear wall, the deformation curve becomes a curved shear type, which reduces the relative displacement between floors. Make the stress between floors more even.

Stiffness characteristics

In the frame shear wall structure, the configuration of the frame structure and the shear wall structure will affect its stiffness characteristics. The stress performance of the frame shear wall structure is greater when it is close to the shear wall structure, and the force is close to the frame structure. In performance, that is, when the base bending moment accounts for more than 20% of the overall bending moment, the frame stiffness is insufficient, and corresponding structural measures must be taken to solve it.

Seismic characteristics

The seismic rating of a frame-shear wall structure building is determined according to the ratio of the respective contributions of the frame stiffness and the stiffness of the shear wall to the structure's seismic performance. Therefore, the relevant seismic design codes can be formulated according to the local seismic fortification requirements and combined with the housing The function of the system requires scientific design of the frame shear wall structure.

Application of Frame Shear Wall Structure Technology in Building Construction

1. Design of frame shear wall structure

First, the designer should scientifically calculate and arrange the number of shear walls according to the local seismic level, and fully apply new seismic technology measures to fully improve the lateral rigidity of the building; and in areas without seismic fortification requirements The amount and location of the frame shear wall structure should be designed mainly by the method of adjusting the internal force of the frame, so that the building construction can achieve the effect of a large space as much as possible on the premise of meeting the rigidity requirements, to meet the current height of high-rise building construction. standard requirement.

Second, in order to fully guarantee the stability and reliability of the building, the frame beams that coincide with the shear wall can be retained. In addition, in order to achieve better visual effects, the frame beams that coincide with the shear wall can also be made For dark beams with the width equal to the thickness of the shear wall, the height of the dark beam should be the same height as the section of the frame beam, or twice the thickness of the shear wall. The reinforcement of the dark beam should at least meet the minimum reinforcement ratio of the frame beam seismic level Requirements and appropriate configuration according to design and construction requirements.

2. Key points of construction technology of frame shear wall structure

Concrete formwork

The following points should be noted in the relevant work of the concrete template project of the frame shear wall structure:

(1) In order to ensure the accuracy and precision requirements of the formwork configuration, the length of the outer formwork of the outer wall should be greater than the inner formwork by about 250 mm when designing the inner and outer formwork arrangement, and the finished wall as a reference object to make the outer formwork and concrete The wall is closely attached, and elastic materials such as sponge are placed between the formwork and the wall to protect the wall and ensure the integrity of the wall.

(2) In order to avoid the position deviation of the inside formwork during the pouring of concrete, the trend of formwork deviation can be resisted by setting the short steel bar head inside the formwork.

(3) When hoisting the wall formwork, it is necessary to control the location of the hoisting to prevent contact with the steel bar, and control the accuracy and stability of the hoisting, and at the same time do a good job of safety protection to avoid possible injury to the construction personnel during construction.

Reinforcement engineering

(1) In order to prevent the steel bar from shifting during installation and pouring of concrete, the location of the steel bar should be scientifically designed, for example, the method of positioning the steel bar by fixing the stirrup frame, on-site solid lofting, etc.

(2) In the frame shear wall structure system, the reinforcement of beam-column joints is relatively dense. In order to ensure the accurate and orderly reinforcement joints, the computer should be used to draw and loft them before construction to provide a reference for accurate construction.

(3) In order to ensure the consistency of the steel bar project, the model parts should be made before large-scale construction, so that the site construction personnel strictly follow the model parts during the construction process, so as to ensure the construction progress and construction quality of the steel bar project.

Concrete engineering

Concrete engineering has a decisive influence on the lateral stiffness performance of frame shear wall structure houses. The following points should be achieved in actual construction:

(1) Do a good job in quality control of concrete materials. Strict inspection system for cement, aggregate, admixtures, etc., and the preparation of concrete in strict accordance with the design requirements. For the concrete used in shear walls and other structures, the mold entry temperature should be reduced as much as possible, which can be added to the mixture Ice chips reduce the initial temperature of the concrete and prevent cracks.

(2) When pouring concrete of frame shear wall structure, concrete members with high strength grade should be poured first, then concrete structural members with low strength grade should be poured, and the poured concrete should be fully vibrated and compacted.

(3) After the concrete is poured, thermal insulation and moisture conservation work should be carried out in time, and the concrete surface should be kept moist for more than 7 hours.

3. Problems needing attention in the construction of frame shear wall structure

During the construction of the frame shear wall structure, attention should also be paid to the following issues:

First, the structure should be simplified as much as possible to avoid complex structures, so as to enhance the ductility of the members and improve the building's ability to resist deformation and seismic forces.

Second, when the frame shear wall structure is used in areas with high seismic fortification requirements, in addition to ensuring the quality of the raw materials, it should also fully draw on advanced foreign technical experience. For example, Japan ’s technical measures when using frame shear structures It is worth learning.

4 Conclusion

In summary, in the house building structure system, the frame shear wall structure combines the technical advantages of the frame structure and the shear wall structure, which is not only beneficial to increase the internal space of the building, but also increase the rigidity of the building, so it is A more flexible and advanced form of house construction. As a technician, in addition to grasping the above technical points in design and construction, it should continue to innovate to further increase the bearing capacity of the frame shear wall structure in all directions, and Provide more flexible building space.

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