A Damage Index for the Seismic Analysis of Reinforced Concrete Members

This article proposes a damage index for the seismic analysis of Reinforced Concrete members using the hysteretic energy dissipated by a structural member and a drift ratio related to failure in the structure. The index was calibrated against observed damage in laboratory tests of 76 RC column units under various protocols. Values obtained in this calibration had acceptable agreement with the levels of damage observed in the test specimens. An analysis of the parameters involved in the definition of the proposed damage index shows the importance of displacement history in the drift ratio capacity of structures.     

Geography in the Republics of Central Asia

A review of the last 50 years of geographic research in the four Central Asian republics of Uzbekistan, Kirghizia, Tadzhikistan, and Turkmenia, where the dominant desert and mountain landscapes impose a specific character on geographic investigations. Physical geography has tended to focus on glaciation in mountains and on surface runoff in the desert as potential sources of water for irrigation. Economic geography has emphasized the utilization of desert pastures.     

THE CAREER OF L. S. BERG

The following appraisal is by Eduard M. Murzayev, physical geographer and toponymist, with interests in Mongolia and Central Asia, who was a student of Berg at Leningrad University, and since this graduation in 1930 has been associated with the Institute of Geography of the Academy of Sciences USSR, first in Leningrad and after 1936 in Moscow. This article is based on a talk given by Murzayev in March 1976 at a memorial session of the Geographical Society USSR in Leningrad.     

Marginal Cost Estimates of the Water Resources of the USSR

A water-management regionalization and determination of marginal cost estimates of water resources over the next three decades (to about 2000) outlines a set of priorities for the construction of dams and interbasin diversion projects. The predicted water requirements are based on the assumption that irrigation needs will increase at a moderate rate (30 million hectares by the end of the forecast period). The resulting marginal cost estimates are expected to affect long-term plans for the location of water-intensive activities (irrigation, water transport, thermal power generation, chemicals, pulp and paper) for which water costs may represent 40 to 50 percent of the total cost difference between alternate locations.     

RECENT POPULATION TRENDS IN THE USSR

Pending the publication of new Soviet population data based on the 1979 census, to be hald next January, the author reviews population trends in the 1970's. After a steady decline through much of the Soviet period, birth rates and death rates have stabilized for the country as a whole, although marked regional differences continue. An unexplained rise in infant mortality and an apparent reduction of life expectancy have led to the suppression of data in these areas. No ready explanation is found for a recent increase in female fertility and age-specific death rates. Abnormalities in the age-sex structure, resulting from past population catastrophes, continue to persist and indicate future labor shortages. Geographical differences in population growth rates, resulting from differential rates of natural increase and migration, are analyzed. Urbanization, a typical phenomenon of the Soviet period, continues apace, with the biggest increases in large cities despite a policy designed to discourage big-city growth. A crucial question is the optimal disposition of the growing labor pool in the Central Asian region-whether to foster local employment or encourage migration from Central Asia to labor deficit areas elsewhere in the Soviet Union.     

SOVIET POPULATION CHANGE AND CITY GROWTH 1970-79: A PRELIMINARY REPORT

The total, urban and rural population of major civil divisions of the Soviet Union and the population of cities over 100,000 are analyzed and mapped on the basis of preliminary results of the 1979 census. Total population growth rates declined during the 1970–79 intercensal period compared with the 1959–70 period while urbanization continued apace, although unevenly on a regional basis. The Slavic and other western republics, which show the highest urbanization levels of 60 percent and more, were also characterized by the lowest overall growth rates of 6 to 8 percent. Rural population declined almost everywhere outside a southwestern belt of high growth extending from parts of the southern Ukraine through Transcaucasia to Central Asia. Among large cities, moderate growth continues among cities with a multifunctional economy; high rates are evident in cities with major current industrial projects (automotive, for example) and in oil production regions; low rates are typical of some coal-mining and steelmaking centers. (For another report on the 1979 census, see “News Notes,” Soviet Geography, September 1979.)