According to statistics, one hundred and thity huge earthquake disasters in the world, 90% to 95% of the casualties are due to the collapse of the building caused. Therefore, the residents of housing, office buildings, schools and school buildings, hospitals, factories and even water, electricity, gas, communications and other lifeline projects, whether to resist the earthquake attacks, whether the earthquake disasters down to the lowest or not, so that "building plans, earthquake first." Therefore, in the "People's Republic of China Earthquake Disaster Mitigation Law" clearly stipulates that the construction project must be in accordance with the requirements of seismic fortification and seismic design specifications for seismic design, and in accordance with the seismic design for construction. Therefore, it is an important mean to strengthen the engineering measures to improve the seismic capacity of the existing engineering structures. Engineering measures are called engineering seismic fortification, including three components as follows:
Seismic safety evaluation work: Seismic safety assessment refers to the study of seismic geology, geophysics, seismicity, and terrain deformation in the specific construction area or site, using the seismic hazard probability analysis method, according to the risk Probability level, and scientifically give the corresponding engineering planning and design requirements for seismic fortification requirements of the ground motion parameters and basic data.
The main contents of seismic safety assessment include: seismic intensity review, design of ground motion parameters (acceleration, design response spectrum, ground motion time curve), seismic zoning, field and surrounding seismic geological stability evaluation, field seismic disaster prediction and so on.
The results of the seismic safety assessment, which have been approved, can be determined as the seismic fortification requirements for the specific construction project.
Damage and fortification of major facilities and lifeline projects: major engineering and lifeline engineering refers to large hydropower stations, nuclear power plants, communications, transportation and water supply, etc.These facilities, earthquake damage, harmful, serious losses, and sometimes cause the city function paralysis, Therefore, relative to the general structure of the building, requiring major engineering and lifeline projects to improve the corresponding seismic fortification requirements.
(2) seismic fortification of industrial and civil buildings. General civil engineering, must be in accordance with the requirements of seismic fortification seismic design, construction, to ensure that the safety of about 6 in the earthquake conditions.
(3) the country should be designated to monitor the defense area of the old buildings, especially the population of public places, the identification of seismic performance, substandard and unsafe to be reinforced to enable it to have the statutory seismic capacity.
All kinds of buildings as long as the provisions of the state in accordance with the seismic design reinforcement, you can achieve a small earthquake is not bad, the earthquake can be repaired, the earthquake does not fall the basic security effect.
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