Steel structure buildings have the best seismic performance.
What kind of house has better seismic performance? What is the seismic effect of more and more high-rise buildings? According to experts, according to the earthquake level from low to high, it can be divided into several situations. In Brunei, rural houses with civil structures have the worst seismic capacity.
90% collapsed in the Sichuan earthquake; Secondly, the multi-layer brick-concrete structure, with 6 to 10 layer more common, because of the large amount of bricks and strong brittleness; The third is the bottom frame structure, that is, the bottom layer is the frame structure, which is used as the commercial outlets and bays facing the street.
Large, more than two floors are brick-concrete structures, because the two materials have different stiffness and are top-heavy, and the bottom floor is easy to collapse after the earthquake.
Frame structure is relatively strong and earthquake-resistant, which is more common in buildings above 10 floor; Frame shear wall structure is better, and pure shear wall structure is better. There is also the strongest steel structure, which is mostly used in shopping malls, passenger stations and other buildings, and is also widely used in Japan and other countries. Good elasticity, can absorb earthquake force, but the cost is very high.
At present, most high-rise buildings with more than 30 stories are frame-shear wall structures, which were not damaged in the Wenchuan earthquake and have very good performance. According to reports, the shear wall is a concrete structure with high stiffness, strong horizontal seismic capacity and strong strength. "So don't look at the height of the building, the key is to look at the building structure."
Don't tear down the house decoration, pay attention to earthquake prevention.
Experts remind people who are going to buy a house that the design of the house has clear indicators. Before buying a house, you can consult the developer or ask for relevant documents to check the seismic fortification standard of the property, at least 7 degrees.
The higher the seismic grade, it means that the more materials are invested, the better the safety. If you already have a real estate license, you can also know the structure of the house by looking at the real estate license. Structure 1
In this column, the words "mixed" and "frame" are generally indicated.
In addition, in order to ensure the seismic safety performance of the house, residents should never tear it down privately when decorating the house. In particular, it is forbidden to demolish and change the foundation, walls, beams, columns, floors and other load-bearing structures of houses.
How to choose an "earthquake-resistant house"?
The last question is definitely lingering for the majority of property buyers. In the face of a potentially devastating earthquake, everyone wants their house to be more "solid", so how can we choose an "earthquake-resistant house"? In this regard, we can pay attention to the following:
First of all, the new house is better than the old one.
The staff of the Housing Quality Inspection Station of Shanghai Housing Architecture Design Institute told the reporter: "From the perspective of earthquake resistance, the general old houses have less consideration in this respect and the standards are correspondingly low. In the 1990s,
After that, the new buildings have higher requirements in this respect, and the seismic performance can be assured. Generally speaking, the seismic standard will be adjusted every 10 year according to the actual situation. With the development of social and economic aspects, it
It is also getting stricter and stricter, and the standards are constantly improving. From this point of view, the older the house, the worse the seismic performance. For example, since 1992, all buildings in Shanghai have suffered a 7-degree earthquake.
Standard fortification construction, the standard can resist the damage of local earthquakes of magnitude 5 to 5.5. Of course, for the houses built before 1992, the municipal government also adopts different ways such as reinforcement and demolition to improve the seismic performance.
Force. ?
The second is the quality of building materials, day
Jiang Chun, deputy director of Tianjin Housing Quality and Safety Appraisal and Testing Center, believes that the seismic performance of residential buildings mainly depends on the quality of building materials, including the tensile strength of steel, structural columns, core columns, ring beams and other components.
At the same time, it will affect the seismic capacity of buildings. Because the anti-seismic facilities of houses are concentrated in concrete shear walls, beams and floors, buyers can learn more about these aspects of houses if they have the conditions. What are the main points when closing the house?
Reference suggestion: 1. Check whether there is any crack at the joint of beam and column. If there is, the crack should not be greater than the thickness of business card; 2. The structural reinforcement shall not be exposed; 3. Buildings should not have basements or walls.
Seepage occurs; 4. Pay attention to whether the concrete is smooth and crack-free. If problems are found, the construction party shall be required to repair them in time. ?
Third, generally speaking, the seismic performance of shear walls is better, so from the perspective of building types, the seismic performance of high-rise buildings will be better, because they are all reinforced concrete structures, also known as shear wall structures. However, many old factory buildings in 1960s and 1970s are brick-concrete structures with poor seismic performance. ?
Fourth, the "certificate" is complete to ensure safety. Can the developer provide the "residential quality guarantee" and "residential instruction manual" and other related certificates for commercial housing? In these documents, the safety performance of buildings, including seismic performance, will be described in detail. In addition, checking the relevant acceptance procedures of development and construction units is also the simplest and most effective way for buyers to inspect the seismic performance of houses. ?
Fifth, in recent years, room decoration is in the ascendant, but at the same time, there are some phenomena that ignore earthquake prevention, such as opening doors on the gable of a building to do business, which weakens the overall performance of the whole building and shortens the service life and form of the house.
Hidden dangers of earthquake damage; Some people use overweight marble floor tiles to pave the ground, which increases the load of the floor and reduces the seismic function of the building. To this end, the Ministry of Construction issued the "Regulations on the Administration of Seismic Fortification of Housing Construction Projects".
It has been implemented since April, 2006 1, so buyers must remember not to destroy the structure of the house when decorating the house.
(The above answers were published on 20 15-09- 17. Please refer to the current actual purchase policy. )
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