Analysis Of Human-induced Vibration Response During Construction Of Long-span Pipeline Suspension Bridge

With the development of China’s economy,a large number of oil and gas pipelines have been growing nationwide.In order to meet the needs of oil and gas transportation,suspension pipeline bridges have been widely used in mountain canyons due to their large spanning capacity,strong adaptability to terrain height differences,and short construction cycles.However,unlike highway suspension bridges,suspension pipeline bridges have a light weight and small structural rigidity,which results in a more intense dynamic response of the structure under dynamic loading.Because the suspension pipeline bridge cannot be installed with large machinery during the construction process,it requires a large number of construction workers to carry out construction operations on the bridge deck.If the bridge deck is disturbed at this time,the staff will have extreme discomfort and uncomfortable A sense of security,which in turn affects the progress of construction operations.At present,there is almost no research on this part at home and abroad,so this paper relies on Chongqing Wujiang Suspension Pipeline Bridge as the engineering background,and mainly performs the following work:(1)The research status of human-induced vibration calculation theory and comfort evaluation are systematically introduced.The calculation formula of single person crossing bridge and crowd crossing bridge calculation is derived by using forced vibration calculation theory,and the bridge vibration response under random distribution of the crowd is analyzed.(2)The dynamic characteristics and analysis methods of long-span suspension pipeline bridges are introduced in detail.Based on these dynamic characteristics,ANSYS is used to establish a finite element model of a suspension pipeline bridge that meets the actual construction conditions.The dynamic characteristics at each construction stage and after the completion of the bridge are analyzed,and the vibration damping effect of the structure after the installation of the wind cable is analyzed.(3)The single-degree-of-freedom resonance method is used to analyze the human-induced vibration response under different working conditions for different population densities,and the human-induced vibration response law under different working conditions is obtained,and the vibration reduction recommendations under the corresponding working conditions are proposed.(4)The dynamic time history analysis method was used to calculate the bridge vibration response under random population distribution and the vibration response of synchronized crowds crossing the bridge,and the results of human-induced vibration responses under different methods were compared.Finally,according to the calculation expression of critical number of people,the number of construction suggestions and comfort evaluation under different working conditions are obtained.