Concept Design Research For Seismic Disaster Monitoring System Of Suspension Bridge

With the continuous development of national economy, long span suspensionbridge construction increased such as bamboo shoots after a spring rain in our country.Meanwhile, our country was prone to earthquakes, and earthquake caused a great harm forsuspension bridge, so it is importantly significant to study the suspension bridge seismicresearch. In order to guide seismic design, experiments and simulation calculation areusually used to analyze the suspension bridge seismic. However, due to the lack of the datawhich reflect the actual response of suspension bridge to a strong earthquake, it isuncertain whether the results of theses studies were objective. This essay proposes aconcept design research for small probability event monitoring, that is, suspension bridgeseismic disaster monitoring system. The data of the response of bridge structure to strongearthquake, collected through this system, is used to verify the seismic experiment andsimulation calculation results and to further guide the seismic design better. Following aremainly work:(1) Developed a suspension bridge seismic disaster monitoring system design principles,strategies and steps to provide guidance for the following design.(2) Used large-scale finite element analysis software MIDAS / CIVIL to model andanalyze the dynamic characteristics of LiShui suspension bridge which is in theexpressway from ZhangJiajie to HuaYuan. It comes to a conclusion that suspensionbridge`s self vibration period is longer, LiShui suspension bridge`s vibration period is14.9s. First few modes are girder vibration, then following by main cable vibration,and vibration and torsion of main tower is later.(3) Used the spectrum and time history analysis to get response characteristics underlongitudinal, transverse, vertical seismic condition from LiShui suspension bridge. thesystem is designed through these critical response data result.(4) Taking Lishui suspension bridge dynamic characteristics and seismic analysis result asthe foundation, used dual coding genetic algorithm to optimize sensor placement,obtain the optimal sensor placement scheme.(5) Taking the optimal sensor placement scheme as foundation, finished LiShuisuspension bridge seismic disaster monitoring hardware selection and system designthrough the investigation from monitoring equipment which is domestic andinternational production and sales for the civil engineering structure monitoring.(6) Used ASP.NET to program the data access system, in order to realize remote dataaccess. finished system software frame design.(7) Completed LiShui suspension bridge seismic disaster monitoring system operationalmode design.