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Tham khảo tài liệu 'implementation of seismic isolation earthquake protection_5', kinh tế - quản lý, kinh tế học phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | STRATEGIES FOR EARTHQUAKE PROTECTION 217 improvement projects community action plans and others described in more detail in Section 6.6. Traditional Buildings The greatest earthquake risk throughout the world is faced by traditional rural communities that build their own houses from locally gathered materials. These houses variously described as traditional earthen vernacular owner-built non-engineered low-income or low-quality form a high proportion of the building stock of many developed countries. Their earthquake performance is notoriously poor as outlined in Chapter 1 and touched on in each of the subsequent chapters of this book. It is estimated that over 75 of the world s population lives in housing of this type.19 Houses are built by the family itself perhaps employing a skilled builder from within the community to direct operations. Traditional construction materials for this type of house are naturally occurring and used in building construction with only limited processing or quality grading such as earth stone wood and fibre. Increasingly commonly used are modern building materials cement steel concrete blocks fired clay bricks roof tiles sheeting processed timber and other materials bought for cash from nearby markets. These types of communities similarly tend to be beyond the control of urban building regulations or planning requirements imposed from central or urban authorities. Instead development programmes based on capacity building and incentives for self-protection against earthquakes have been more successful. There have been a number of development projects focusing on improving the earthquake protection for traditional rural communities by increasing the capability of local craftworkers and the builders in each community to build earthquake-resistant structures with the skills and materials they have available. These types of projects discussed in Section 6.6 have been mainly pioneered by development agencies but increasingly adopted by .
