In-flood pedestrian safety degree evaluation method based on mechanical analysis
A technology with a high degree of safety and flood, applied in data processing applications, instruments, calculations, etc., can solve problems such as narrow scope of application, greater influence of test objects' physiological and psychological factors, etc.
Inactive Publication Date: 2017-04-26
WUHAN UNIV
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The test results based on the real human body are generally greatly affected by the physiological and psychological factors of the test object; while the theoretical formula derivation based on mechanical analysis often makes too many simplifications or assumptions about the human body structure and flow conditions, and the scope of application is narrow
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[0038] The present invention will be further described below with reference to the accompanying drawings.
[0039] like Figure 1-5 As shown, a method for evaluating the safety degree of pedestrians in floods based on mechanical analysis includes the following steps:
[0040] Step 1, the mechanical analysis of pedestrian instability under flood action, and the derivation of the starting flow velocity formula under different instability modes, including steps 1.1-1.3.
[0041] Step 1.1, in the flood, pedestrians mainly bear the water current drag force F in the horizontal direction D and ground friction force F R Action; bear its own gravity F in the vertical direction g , buoyancy F B and the ground support force F N effect.
[0042] Buoyancy: Due to the irregularity of the human body structure, ergonomic principles are used to calculate the buoyancy, and the dimensions and corresponding volumes of various parts of the human body are considered. According to the charact...
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The invention relates to an in-flood pedestrian safety degree evaluation method based on mechanical analysis. The method comprises steps that force bearing characteristics of a pedestrian in the flood is analyzed, buoyancy borne by a human body and non-uniform flow speed distribution dependent on water depth are considered, in combination with a sediment incipient motion theory in river dynamics, a starting flow speed formula during slipping and tumbling instability of the pedestrian in the flood can be acquired through derivation; a human body model water tank test is developed, a starting flow speed of the pedestrian under different instability mode and water depth conditions is acquired, relevant parameters in the formula are calibrated, and instability conditions of a human body prototype in different water depths are estimated through utilizing a model scale relationship and the calculation formula after calibration; lastly, parameters during sliding and tumbling instability of the pedestrian are re-calibrated through employing an existing real human body water tank test result, in combination with a two-dimensional water power model, flood essential factors are calculated, and a safety degree of the pedestrian in the flood is determined. The method is advantaged in that scientific bases can be provided for flooding zone program, city flood risk management map drafting and flood prevention evaluation.
Description
technical field [0001] The invention relates to the technical field of hydraulic engineering, in particular to a method for evaluating the safety degree of pedestrians in floods based on mechanical analysis. Background technique [0002] In recent years, affected by global warming and human activities, the probability of extreme hydrological events has increased, and urban rainstorms and floods have occurred frequently, resulting in serious casualties. Today's rapid population growth and the continuous expansion of human activities have increased people's risk of flooding. Therefore, the research on the safety of pedestrians in floods is of great significance. [0003] At present, the existing assessment methods for pedestrian safety in floods are mainly reflected by the starting velocity of the human body when the human body is unstable under a certain water depth. There are not only research results based on real human experiments, but also theoretical formulas based on c...
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IPC IPC(8): G06Q10/06G06Q50/26
CPCG06Q10/0635G06Q50/265Y02A10/40
Inventor 夏军强陈倩邓珊珊果鹏周美蓉
Owner WUHAN UNIV