How to compare the seismic performance of steel structures

The seismic capacity of frame structure is better than that of brick-concrete structure.

But these two structures are the same in normal use.

The only difference is that the residential building adopts brick-concrete structure and the public building adopts frame structure. The following is my brief introduction to various types of structures.

1. Brick walls are load-bearing and are called brick-concrete structures.

Commonly used in ordinary multi-storey houses below 7 floors.

Advantages: low cost, simple and fast construction.

Disadvantages: it is not suitable for complex architectural forms, and has strict structural requirements such as height and room size, and its seismic capacity is slightly weak.

2. The bearing capacity of concrete beams and columns is called frame structure.

It is often used in multi-storey public buildings below 10, such as office buildings and shopping malls. It is also used for high-rise buildings in non-earthquake areas.

Advantages: the indoor space is large, which can meet the complex architectural forms and has a slightly strong earthquake resistance. The partition wall of the room can be removed and replaced at will.

Disadvantages: the frame column is too large, which is not suitable for civil residence. It is difficult for the earthquake zone to exceed 7 stories.

3. Concrete beams and concrete walls bear loads, which is called shear wall structure.

It is often used in ordinary high-rise houses, as well as multi-storey houses and villas with very complicated room types.

Advantages: the load-bearing structure is a flaky concrete wall, and there is no column angle in the room, which is more suitable for living than the frame structure. The concrete wall has the strongest seismic capacity and high safety.

Disadvantages: There is a large amount of concrete, and the total height usually does not exceed 150m. The concrete wall is a high-strength load-bearing wall, so the room cannot be demolished.

4. Frame structure mixed with some concrete walls is called frame shear wall structure.

Commonly used in high-rise office buildings, shopping malls, hotels.

Advantages: the utilization of indoor space and the demolition and transformation of room partitions are as flexible as frame structures. Seismic performance is as strong as pure shear wall structure.

Disadvantages: There is a large amount of concrete, and the total height usually does not exceed 150m.

5. Steel columns and beams bear loads and are called steel structures.

Commonly used in factories, super high-rise civil buildings and landmark buildings.

Advantages: light weight and fast construction. It can be built to a height of more than 500 meters or even higher. Because it is a flexible structure, the seismic destructive power has little influence on it.

Disadvantages: steel is afraid of corrosion, building maintenance is difficult, and maintenance costs are expensive. Steel is most afraid of high temperature, and fire is steel structure housing's natural enemy (the World Trade Center was a fire caused by a plane collision, which caused the whole building to collapse).

6. The frame column in the frame shear wall structure is made of steel, or wrapped with steel on the outside of the column, which is called a mixed structure.

Commonly used in super high-rise civil buildings and landmark buildings.

Advantages: The concrete structure mixed with large cross-section steel can effectively reduce the size of concrete columns, reduce the weight of the structure, and strengthen the seismic and load-bearing performance of the columns. It can be repaired higher than the ordinary frame shear wall structure, and the highest can be repaired to 300 meters or even higher.

Disadvantages: due to the combination of the advantages of frame-shear wall structure and steel structure, this structure is widely used in buildings of 150m ~ 300m, with fewer disadvantages.