Showing papers by "Ben-Gurion University of the Negev published in 1970"
TL;DR: In this paper, the main aspect of seismic response of two adjacent multistory buildings is their possible pounding due to an earthquake, and the possible occasional pounding of buildings due to earthquake excitation is analyzed by the combination of direct numerical integration of the corresponding differential equations of motion and the classical impact analysis of two rigid laminae in planar motion.
Abstract: The main aspect of seismic response of two adjacent multistory buildings is their possible pounding due to an earthquake. Both buildings are treated as non-symmetric with respect to their mass and/or stiffness characteristics, so, when subjected to earthquake excitation, both buildings perform the corresponding 3D motion. If the mechanical characteristics of buildings are different, buildings perform an out-of-phase motion so, if the initial separation of buildingss is not sufficient, occasional pounding between slabs of the same level is to be expected. The final result of collision between buildings may be a substantial damage, or even worse, a collapse of buildings. Possible occasional pounding of buildings due to earthquake excitation is analyzed by the combination of direct numerical integration of the corresponding differential equations of motion and the classical impact analysis of two rigid laminae in planar motion.
3 citations
TL;DR: In all 4 patients, computed tomography scan revealed a clear retina and no scleral perforation or foreign body intrusion, but bilateral radiodense areas were located anterior to the insertion of the horizontal rectus muscles.
Abstract: Senile scleral plaques are late onset ocular calcifications, and are usually detected incidentally on orbital computed tomography scan following trauma. This report is of 4 elderly patients with senile scleral plaques who were admitted to the emergency room following trauma to the head. A head/orbital computed tomography scan was performed as part of the routine examination. In all 4 patients, computed tomography scan revealed a clear retina and no scleral perforation or foreign body intrusion, but bilateral radiodense areas were located anterior to the insertion of the horizontal rectus muscles. These areas were diagnosed as senile scleral plaques. Even though these ocular calcifications are benign, they have important prognostic implications, and should therefore be identified correctly and not confused with other ocular pathologies.