| The working environment of air conditioning pipeline system in high-rise building is complex, which is subjected to the loads of bearing capacity, earthquake, water hammer impact caused by the accident of stop valve and stop pump. In addition to the previous loads, the pipeline system from the super high-rise 117 building which is under construction now also has the characters of large elevation difference and intermediate pressure, which create big challenges for the installation and the design of mounting brackets.In this thesis, the safety performance and the safety evaluation of pipeline system in the 117 building under different loads were analyzed by the methods of theoretic calculation and numerical simulation. The main research work and the results are shown as follows:(1) Two multilevel fixation type with corbel reinforcing structure and double-plate reinforced structure were proposed, and the optimal design scheme were obtained by stress analysis and comparison of these two fixation types with ANSYS software.(2) Seismic performance evaluation of the pipeline system under both OBE and SSE seismic response spectrum were conducted by numerical simulation according to the more stringent code of ASME-AG-1-2003, both strength and stiffness were analyzed in the thesis.(3) The pressure fluctuation of air conditioning pipeline system were analyzed by using fluid analysis software FLOWMASTER, which concludes different operations of pump stopped and valve closed, and the fluctuation law of water hammer in pipeline system under three kinds of accidents is obtained. Then, this thesis put forwards most valuable closing operation scheme, which can be conductive to inhibit water hammer shock.The safety study of air conditioning pipeline system in the 117 building under multiple loads provided a reference for the design and installation of pipeline system in the other high-rise buildings, which has much practical significance. |
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