محمدرضا حسين فلاح

With the expansion an‎d advancement of underground rail transport networks in urban areas, the issue of vibrations caused by passing rail fleets an‎d their impact on adjacent structures has become an important subject in the design an‎d construction of vibration-resistant buildings. In this context, the use of seismic isolators—especially Lead Rubber Bearings (LRB)—is proposed as one of the most effective methods to reduce building vibrations. The aim of this research is to investigate the effect of LRB isolators with different mechanical properties on reducing vibrations transmitted to buildings adjacent to metro tunnels. For this purpose, finite element modeling was employed. A two-dimensional (plane strain) model of the cross-section of a metro tunnel adjacent to a steel frame building was developed in the ABAQUS finite element software. The model was validated using field test results published in previous studies, ensuring the accuracy of the simulation. Then, for parameter studies regarding different LRB properties, two steel-frame buildings with 4 an‎d 8 stories were modeled on three types of soils with varying stiffness (soft, medium, an‎d stiff). Dynamic analyses were conducted, an‎d the effect of installing LRB isolators with different vertical stiffnesses under the building columns was examined. The results showed that reducing the vertical stiffness of the isolator increases the effectiveness of the base isolation system in mitigating vibrations. The influence of various parameters—including soil type an‎d building height—was thoroughly analyzed an‎d compared. Ultimately, the performance of LRB isolators in reducing vibrations was confirmed as an effective solution for the design of resilient structures near underground rail lines. The best efficiency in reducing vibration levels was observed for soil with Cs = 410 m/s an‎d the isolator type LRB-ERB-900, which demonstrated a significant reduction in structural vibration levels.

جداگر لاستيكي با هسته سربي , ارتعاشات ناشي از قطار , تونل هاي ريلي , تحليل اجزا محدود , كاهش ارتعاش

Lead Rubber Bearing , Induced Vibrations , Railway Tunnels , Finite Element Analysis , Finite Element Analysis

MohammadReza Hosein Fallah

AliReza Tolo Kian