NUMERICAL STUDY OF SEISMIC BEHAVIOUR OF REINFORCED SOIL BRIDGE ABUTMENTS UNDER DIFFERENT GROUND MOTIONS

سال انتشار: 1398
نوع سند: مقاله کنفرانسی
زبان: انگلیسی
مشاهده: 179

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شناسه ملی سند علمی:

SEE08_348

تاریخ نمایه سازی: 23 آبان 1399

چکیده مقاله:

Reinforced earth walls have gained numerous applications in geotechnical engineering. Reinforced bridge abutments are similar to earth walls except that they carry a surcharge load near the top edge (from the bridge deck) in addition to the soil horizontal pressure behind the reinforced earth zone. Since bridges are among the significant infrastructures, they are expected to remain in service after earthquakes. The reinforced soil abutments of single-span overpass railway bridges were completed near Ahvaz- Khorramshahr highway located southwest Iran, to accommodate two traffic lanes and two sidewalks. It is observed that the bridge deck/ girder load is carried by a strip footing on top of the reinforced abutment. Hence bridge loads are transferred directly to the reinforced soil zone.Due to high seismicity of Iran, it is essential to study the behavior of reinforced soil abutments of single-span overpass railway bridges under seismic excitations. The reinforced soil abutment is one of the overpass bridges having a single-spanof 19 m and 7 m abutment height constructed in Khuzestan Province in southwestern Iran. Foundation soil type was soft to medium stiff clayey deposit with high groundwater level. FLAC 2D was used to simulate the seismic excitations. Different ground motions selected from historical records of some important earthquakes around the world and also artificial harmonic wave were applied to the model to study its behavior under differnet seismic condition. Figure 2 shows the geometry, boundary conditions, loading, reinforcement arrangement, interface elements, and finite difference grid for numerical simulation of abutment.

نویسندگان

Kazem FAKHARIAN

Associate Professor, Amirkabir University of Technology, Tehran, Iran

Mohammadreza KASHKOOLI

M.Sc. Graduate, Amirkabir University of Technology, Tehran, Iran