EFFECTS OF GROUNDWATER LEVEL FLUCTUATION ON SUPERSTRUCTURE’S SEISMIC BEHAVIOUR IN DHAKA CITY

سال انتشار: 1398
نوع سند: مقاله کنفرانسی
زبان: انگلیسی
مشاهده: 165

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شناسه ملی سند علمی:

SEE08_364

تاریخ نمایه سازی: 23 آبان 1399

چکیده مقاله:

During an earthquake, site surface ground motion is different in terms of amplitude and frequency content in comparison to the bedrock motion. These changes are due to dynamic response of subsoil layers. This dynamic behaviour is a function of strain level of soil and pore presser level. In Dhaka city, during the monsoon seasons, because of high precipitation, the ground water level goes up in some areas. This, in turn, may result in a higher pore water pressure during an earthquake, which consequently filters some of the high frequency content of the earthquake motion and amplifies some other frequencies. In this study, the effects of such changes (both in ground motion frequency content and in amplification factor) and their effects on superstructure’s behaviour are calculated. At first stage, the site soil profile is modelled and analysed by use of one dimensional nonlinear site response analysis. The soil profile is modelled using an equivalent system of spring and dashpot as shown in Figure 1.The deformation of subsoil layers due to earthquake shaking generates irreversible deformation in soil that results in excess pore pressures development. This excess pore pressure reduces the soil effective stress and soil strength. The model proposed by Matasovic and Vucetic (1995) is used in this study to account for pore pressure as a function of number of cycles and cyclic strain

نویسندگان

Abbas FATHI AZAR

M.Sc. Graduate, Power and Water University of Technology (PWUT), Tehran, Iran

Hamidul AHASAN

Design Engineer, Smart Development Engineering (SDE) Ltd, Dhaka, Bangladesh

Raquib AHSAN

Director, Japan Institute of Disaster Prevention and Urban Safety, BUET, Bangladesh

Mehedi A. ANSARY

Professor, Department of Civil Engineering, BUET, Bangladesh