Tezin Türü: Doktora
Tezin Yürütüldüğü Kurum: Orta Doğu Teknik Üniversitesi, Mühendislik Fakültesi, İnşaat Mühendisliği Bölümü, Türkiye
Tezin Onay Tarihi: 1999
Tezin Dili: İngilizce
Öğrenci: Oğuz Çalışan
Danışman: M. YENER ÖZKAN
Özet:ABSTRACT A MODEL STUDY ON THE SEISMIC BEHAVIOR OF GRAVITY RETAINING WALLS ÇALIŞAN, Oğuz Ph.D., Department of Civil Engineering Supervisor: Prof. Dr. M. Yener ÖZKAN January 1999, 168 pages A model study was performed in order to investigate the effect of various factors such as acceleration amplification, wall mass and displacements on seismic pressures developed behind gravity retaining walls. A shaking table creating sinusoidal motions with amplitudes in between 1-5 mm and frequencies 1-5 Hz was designed and constructed. The soil pressures that develop behind a specially manufactured gravity retaining wall model during testing were measured by earth pressure cells. The wall displacements and the accelerations of the backfill were also measured by displacement transducers and accelerometers respectively. The measured values during tests were registered by a computer-controlled data acquisition system specially designed for this study. Shaking table tests on laterally iiibraced walls were also conducted at different displacement amplitudes and frequencies of the input motion. As a result of the experimental study it was found out that there is considerable amplification of acceleration through the backfill during seismic loading of gravity walls. The acceleration amplification behind the laterally braced walls was found out to be negligible. Considerably higher seismic incremental pressures than the ones calculated by Mononobe-Okabe method were measured during the tests conducted on gravity retaining walls. The point of application of the incremental seismic thrust was determined to act at about 0.4H above the bottom of the wall. The magnitude of seismic pressures behind the laterally braced model wall was in agreement with Wood's (1973) solution with the point of application of seismic thrust being at about 0.55H above the wall bottom. Key Words: Gravity Retaining Wall, Laterally Braced Wall, Acceleration Amplification, Seismic Lateral Earth Pressure, Application Point of Seismic Thrust. IV