Research On The Vibration Serviceability And The Structure-borne Noise Of Over-track Buildings On The Workshop By Crane Loads

Over-track buildings can improve the urban land utilization efficiently as well as bring us great social and economic benefits. Therefore, they are developing rapidly these years. However, the vibration serviceability and structure-borne noise of these over-track buildings caused by the moving train and crane loads have been one of the main bottlenecks restricting its development. Many research and field measurements on the analysis model of environmental vibration induced by trains, the propagation rule and the effect on buildings have been conducted by scholars at home and abroad and had achieved great achievements. However, the research of the vibration and structure-borne noise caused by crane load haven’t been reported yet. Many studies show that the crane induced vibration and noise will not produce structural safety issues, but it will affect users’ work efficiency and their quality of life and thus reducing the applicability of these structures. Therefore, the control of vibration and noise can actively promote the development of over-track buildings in the urban construction. Based on an over-track structure, this paper has studied the characteristics of crane load. Meanwhile, the sophisticated FEM model of the structure for serviceability has been constructed through field measurement and numerical analysis. Finally, this paper studied the vibration response and structure-borne noise excited by moving crane. The following research works are carried out:1. Combining with domestic and foreign standards and codes in the field of vibration serviceability and structure-borne noise have been summarized, and based on the available standards, the vibration and structure-borne noise caused by moving crane load are evaluated;2. The differences of the model simplification methods of a structure under strong and week vibration is analyzed, and the necessity of a sophisticated structure model for vibration serviceability is presented. Consequently, considering the non-structural components’ contribution to the stiffness and damping of the structure, the sophisticated FEM model is constructed;3. The calculation model of the crane-track beam is established. The supporting force of the track beam support under crane load is extracted to be input into the sophisticated FEM model. Then, the calculated vibration response in the upper structure is compared with the measured data to verify the effectiveness of the sophisticated FEM model.4. The structure-borne noise of this structure is predicted according to the prediction method and compared with the measured results to check the applicability of the equation. Then the acoustics finite element model has been established by using Virtual. Lab Acoustics software to study the vibration and acoustic characteristics of this structure;5. Steel columns were replaced by reinforced concrete columns in sophisticated calculation model, and then this paper studied the different vibration response and structure-borne noise level between these two materials in order to get good guidance to the design of similar structures.Finally, based on the summaries and conclusions of all research works, some suggestions and prospect for further researches are put forward.