EVALUATION PROCEDURE FOR SEISMIC STRESS DEVELOPED IN SHIELD TUNNELS BASED ON SEISMIC DEFORMATION METHOD

Performance-Based Seismic Assessment of Shallow Tunnels Using Pushover Analysis

این مقاله قصد دارد که با استفاده از تحلیل بارافزون به تحلیل لرزه ای بر مبنای عملکرد پوشش تونل های کم عمقی که در خاک ساخته شده اند و تحت بارگذاری موج برشی قائم قرار گرفته اند بپردازد. تحلیل بارافزون یک تحلیل استاتیک غیرخطی است که بر اساس جابجا کردن جانبی مدل دو بعدی خاک و تونل عمل می‌کند. این تحلیل تنها مود تغییر شکل اعوجاج (رکینگ) مقطع عرضی پوشش تونل را ارزیابی می‌کند و نسبت به سایر روشهای عددی...

Displacement-based Rapid Seismic Assessment Procedure for Building Structures

Evaluation of Nsp to Estimate Seismic Deformation : Sdf Systems

Investigated in this paper is the approximation in the ATC-40 nonlinear static procedure (NSP) that the earthquake-induced deformation of an inelastic single-degree-of-freedom (SDF) system can be estimated by an iterative method requiring analysis of a sequence of equivalent linear systems. Several deficiencies in the ATC-40 Procedure A are demonstrated. This iterative procedure did not converg...

New Lateral Force Distribution for Seismic Design of Structures Based on Seismic Demand Ratio

The design of earthquake-resistant buildings starts with defining the maximum lateral earthquake forces or their resultant. The amount of these forces depends on various factors, including coefficient of system behavior which depends on overstrength and its ductility. In this study, a method is presented for designing an earthquake-resistant system in which the distribution of lateral forces is...

Seismic Propagation from Activity in Tunnels and Underground Facilities

Dynamic mechanical activity in a tunnel can be measured as ground vibrations at offset distances. These signals can be processed in sensing algorithms for detection, location, and discrimination of the activity. The objective of this work is to demonstrate that seismic simulations can reveal the effect of the environment on seismic energy as it propagates from tunnels. Using massively parallel ...