Due to various construction techniques such as pile driving, quarry blasting etc., a huge amount of ground vibration is induced. Since most infrastructure developments are being carried out across rural areas, residential buildings in rural areas are frequently affected by construction vibrations. Significant damage can be occurred in Unreinforced Masonry buildings (URM) because of low strength of masonry. Propagation of construction vibration depends on factors such as the type and distance of vibration source, soil condition, soil-structure interaction etc. With the increase of Peak Particle Velocity (PPV) which is used to denote the quantity of vibration, induced energy waves due to construction vibrations will be propagated to the surrounding. This research is based on analyzing the impact of construction vibrations on URM buildings using Finite Element Modeling (FEM). Threshold limits and controlling factors of construction vibrations that can be resisted by URM buildings were identified. Analysis of masonry behavior is complicated due to non-homogeneity, several bond types and numerous contact surfaces in masonry. With the software ABAQUS CAE, simplified micro modeling was used to model the masonry behavior considering the reliability and accuracy level of simulations. It was revealed that applying a concrete footing instead of rubble footing is effective to reduce the vibration impact on URM buildings whilst providing a concrete frame together with a concrete footing is more effective. Screening vibrations with an in-filled trench was identified as another method to reduce the impact of construction vibrations on URM buildings. Though the rigidity of URM building is less, via applying the in-filled trench, the damage to URM building can be significantly reduced.

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Propagation and Attenuation Characteristics of Ground Vibrations Due to Construction Activities

  • Thilini Rajapaksha,
  • Sudhira De Silva

摘要

Due to various construction techniques such as pile driving, quarry blasting etc., a huge amount of ground vibration is induced. Since most infrastructure developments are being carried out across rural areas, residential buildings in rural areas are frequently affected by construction vibrations. Significant damage can be occurred in Unreinforced Masonry buildings (URM) because of low strength of masonry. Propagation of construction vibration depends on factors such as the type and distance of vibration source, soil condition, soil-structure interaction etc. With the increase of Peak Particle Velocity (PPV) which is used to denote the quantity of vibration, induced energy waves due to construction vibrations will be propagated to the surrounding. This research is based on analyzing the impact of construction vibrations on URM buildings using Finite Element Modeling (FEM). Threshold limits and controlling factors of construction vibrations that can be resisted by URM buildings were identified. Analysis of masonry behavior is complicated due to non-homogeneity, several bond types and numerous contact surfaces in masonry. With the software ABAQUS CAE, simplified micro modeling was used to model the masonry behavior considering the reliability and accuracy level of simulations. It was revealed that applying a concrete footing instead of rubble footing is effective to reduce the vibration impact on URM buildings whilst providing a concrete frame together with a concrete footing is more effective. Screening vibrations with an in-filled trench was identified as another method to reduce the impact of construction vibrations on URM buildings. Though the rigidity of URM building is less, via applying the in-filled trench, the damage to URM building can be significantly reduced.