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Wenchuan earthquake "shock" across the Taiwan Strait, but also sparked a strong earthquake disaster reduction concerns. In June, held in Fuzhou "Second Green Building and Energy Conservation Fair" (the "Green Fair") on the mainland and Taiwan from the construction and engineering seismic experts, focusing on improving the seismic performance of buildings, to promote disaster prevention and early warning and disaster emergency treatment technology and other issues, conducted in-depth discussion.
Seismic zoning map should be adjusted
Earthquake caused building collapse, is the main factor causing casualties. The "Green Fair" forum, Chinese Academy of Sciences Zhou Xiyuan made a "seismic zoning and earthquake-proof," keynote speech. The combination of well-known expert of China Earthquake Seismic characteristics and regional distribution of seismic construction status of China's earthquake-proof construction and creative ideas put forward for particular attention.
Founding of New China, the state has developed four generations of seismic zoning map, the figure is divided into every city, town of seismic intensity, earthquake-proof projects became the foundation and precondition. For decades our country from the actual situation of the earthquake, seismic zoning map of the seismic zone as defined in the basic line with reality, but there are a considerable number of earthquakes occurred in the low-intensity zoning map or the surrounding area, while inferior to the actual seismic intensity zoning Map of fortification intensity is much greater.
Do this, experts suggest, considering the national economic strength and improve the standards of seismic fortification may increase the cost of seismic zoning adjustments.
Seismic levels need to improve Half a century, domestic engineers and technicians learn lessons from previous earthquake experience, continuing to set various conditions for seismic technology works. Xingtai earthquake in 1966 that "a bit deeper foundation, walls thicker, softer roof" concept, to the Tangshan earthquake in 1976, the brick building to create additional "structural column and circle beam" technology, even today the implementation of "minor earthquake , the shock can repair, earthquake is not down "of the earthquake-proof theory, engineering standards for seismic design specifications gradually improved and perfected.
Earthquake, however, still result in more than 650 million homes collapsed and 2.300 million houses were damaged, the North River, Yingxiu and some other towns were razed to the ground. In this regard, Zhou Xiyuan Academy explained that one of three reasons: First, there is no standard construction, two more than the expected strength of the earthquake, three is the quality of the project, but related. In addition, the farmers did not fortification of basic housing, which collapsed in the earthquake the worst.
But also to see the other side of the building by 7 degrees, such as fortification, installation cost (Note: The construction and installation cost per square meter) to 10%, 20% of 8 degrees to 9 degrees to increase 40%. Would like to improve the housing large earthquake standards, is clearly not realistic. How to spend less and also enhance the seismic capacity of earthquake engineering profession need to be fully overcome the problem.
Experts suggest governmental organizations around the seismic and construction experts from the local rural realities and affordability starting to study the seismic capacity of room to improve agricultural measures. Moreover, you should tell the farmers not only need the standard building design, but also in accordance with the standards of construction, or seismic capacity will be compromised.
"Green Fair" period, China Architecture Design and Research Institute of Seismic Research Fellow former director WANG Yayong came in Fujian, did entitled "earthquake damage of buildings," the report.
Him: "Since the earthquake can not be avoided, earthquake prediction is not yet solved the world's problems, then we should focus on how to improve the seismic performance of buildings." Combination of their own on-site research, WANG Yayong from coupling beam design, structural integrity, strong column and weak beam, seismic joints, staircases, non-structural components and teleseismic long-period effect of the seven aspects, described Seismic Design of Buildings multiple seismic fortification of thinking.
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