济南绕城高速公路二环线东环段项目跨胶济铁路立交桥采用两幅T构箱梁(2×80 m T构与2×60 m T构)平行同步转体结构形式。根据高速公路项目结构特点、施工组织及管理模式,针对性地开展BIM建模、模型深化应用及部署BIM管理平台。...济南绕城高速公路二环线东环段项目跨胶济铁路立交桥采用两幅T构箱梁(2×80 m T构与2×60 m T构)平行同步转体结构形式。根据高速公路项目结构特点、施工组织及管理模式,针对性地开展BIM建模、模型深化应用及部署BIM管理平台。通过BIM技术的综合应用,提高项目工程质量、施工进度、协同化管理水平。本文结合跨越铁路转体桥高速公路工程实际BIM技术运用案例,在施工过程中以解决现场实际问题为出发点,从技术建模与管理平台搭建探讨BIM应用价值,为今后转体桥运用BIM技术提供借鉴。展开更多
Double-column bridge piers are prone to local damage during earthquakes,leading to the destruction of bridges.To improve the earthquake resistance of double-column bridge piers,a novel swing column device(SCD),consist...Double-column bridge piers are prone to local damage during earthquakes,leading to the destruction of bridges.To improve the earthquake resistance of double-column bridge piers,a novel swing column device(SCD),consisting of a magnetorheological(MR)damper,a current controller,and a swing column,was designed for the present work.To verify the seismic energy dissipation ability of the SCD,a lumped mass model for a double-column bridge pier with the SCD was established according to the low-order modeling method proposed by Steo.Furthermore,the motion equation of the double-column bridge pier with the SCD was established based on the D′Alembert principle and solved with the use of computational programming.It was found that the displacement response of the double-column bridge pier was effectively controlled by the SCD.However,due to rough current selection and a time delay,there is a significant overshoot of the bridge acceleration using SCD.Hence,to solve the overshoot phenomenon,a current controller was designed based on fuzzy logic theory.It was found that the SCD design based on fuzzy control provided an ideal shock absorption effect,while reducing the displacement and acceleration of the bridge pier by 36.43%‒40.63%and 30.06%‒33.6%,respectively.展开更多
文摘济南绕城高速公路二环线东环段项目跨胶济铁路立交桥采用两幅T构箱梁(2×80 m T构与2×60 m T构)平行同步转体结构形式。根据高速公路项目结构特点、施工组织及管理模式,针对性地开展BIM建模、模型深化应用及部署BIM管理平台。通过BIM技术的综合应用,提高项目工程质量、施工进度、协同化管理水平。本文结合跨越铁路转体桥高速公路工程实际BIM技术运用案例,在施工过程中以解决现场实际问题为出发点,从技术建模与管理平台搭建探讨BIM应用价值,为今后转体桥运用BIM技术提供借鉴。
文摘Double-column bridge piers are prone to local damage during earthquakes,leading to the destruction of bridges.To improve the earthquake resistance of double-column bridge piers,a novel swing column device(SCD),consisting of a magnetorheological(MR)damper,a current controller,and a swing column,was designed for the present work.To verify the seismic energy dissipation ability of the SCD,a lumped mass model for a double-column bridge pier with the SCD was established according to the low-order modeling method proposed by Steo.Furthermore,the motion equation of the double-column bridge pier with the SCD was established based on the D′Alembert principle and solved with the use of computational programming.It was found that the displacement response of the double-column bridge pier was effectively controlled by the SCD.However,due to rough current selection and a time delay,there is a significant overshoot of the bridge acceleration using SCD.Hence,to solve the overshoot phenomenon,a current controller was designed based on fuzzy logic theory.It was found that the SCD design based on fuzzy control provided an ideal shock absorption effect,while reducing the displacement and acceleration of the bridge pier by 36.43%‒40.63%and 30.06%‒33.6%,respectively.
