Field Measured Study Of Wind-induced Response Of Coal-shed With Air-supported Membrane Structure

Large-span air-supported membrane structure has the advantages of light weight,large building space,fast construction speed and good economy.In recent years,it has been gradually popularized and applied in the field of closed buildings in storage yard.And it is developing towards super long span and super long direction.With the gradual increase of the span of the structure,the air-supported membrane structure faces new problems in terms of computational analysis theory,design method,fabrication and installation process,etc.,which need to be further studied.The working principle of the air-supported membrane structure is to make a closed space from the membrane material.At the same time,wire ropes are arranged on the outer surface of the membrane material.After inflating the interior of the building with an inflation system,the pressure difference between the inside and outside is used to resist external wind.The air-supported membrane structure is a wind-sensitive structure.With the application of large-span air-supported membrane structures in the high basic wind pressure and complex wind environment,based on field measurements,it is of great significance to study the wind-induced response law of such structures in typhoon areas,Based on the field measurement data of the large-span air-supported membrane structure coal shed health monitoring system deployed by the research group in Zhejiang Yueqing Power Plant,this paper deeply analyzes the wind-induced response characteristics of the structure.The research content and results are as follows:(1)Based on the wind-induced response characteristics of the large-span air-supported membrane structure,relying on the Zhejiang Yueqing Power Plant project,a large-span air-supported membrane structure coal shed health monitoring system was developed and deployed.Based on the field conditions of the air-supported membrane structure coal shed in Zhejiang Yueqing Power Plant,a set of health monitoring system suitable for the large-span air-supported membrane structure coal shed was designed and developed.The permanent monitoring plan and monitoring method for the acceleration and displacement of the membrane control point,the wind pressure on the membrane surface,the strain of the cable,and the external meteorological data were determined,and the optimization plan for the arrangement of the sensor measuring points was completed.According to the construction conditions of the site,the deployment and installation of the health monitoring system has been completed,and functions such as continuous synchronous acquisition of multiple physical quantities,automatic data storage,automatic alarm and long-term monitoring have been realized.(2)Based on the internal pressure adjustment test,the stability and reliability of the monitoring system was verified,and the membrane surface displacement characteristics of the large-span air-supported membrane structure under the action of internal pressure was determined.Before the typhoon "In-Fa" makes landfall in 2021,based on internal pressure adjustment,the response changes of the control point displacement were collected.At the same time,using ANSYS APDL finite element analysis software,the displacement characteristics of the structure in the process of internal pressure adjustment were simulated and analyzed.Based on the field monitoring results and numerical simulation analysis,the stability of the monitoring system was verified.At the same time,the displacement response law of the air-supported membrane structure under the action of internal pressure is revealed.(3)Based on the measured data under the action of typhoons " In-Fa " and "Chan-Thu" in 2021,the wind-induced response characteristics of the large-span air-supported membrane structure coal shed are determined.Based on the measured data under the action of the typhoon "Chan-Thu" in September 2021,the characteristics of the displacement response under the typhoon "Chan-Thu " were analyzed.At the same time,numerical simulation analysis was carried out by using the equivalent static wind load and considering the pulsating wind dynamic load respectively.The measured data and numerical simulation analysis results show that the maximum displacement calculated considering the fluctuating wind load is slightly larger than the measured value,but the maximum displacement calculated based on the equivalent static wind load based on the measured wind speed is much larger than the measured value.Therefore,the dynamic response analysis method considering the pulsating wind effect should be adopted for the wind-induced response of the air-supported membrane structure.