Research On Safety Monitoring Ofthe Construction Process Of Giant Overhanging Structure

With the rapid increase of national economy level,due to the large cantilever structure has the special advantage in structure shape,the lower structure with the diversity of space operation,can realize multi-function area design,and more beautiful sex,especially since entering the 21 st century,construction technology and the innovation of new building materials,gives its rapid development.But giant cantilever stress complex structural system,construction conditions,during construction structure stiffness,load changing,structures will occur,the internal force redistribution and cantilever end vertical rigidity is weak,it is very bad for seismic,and if the structure of the natural vibration frequency and frequency close to people walking,easy to produce resonance,trigger the body’s reaction,therefore,the structural dynamic characteristics test,to obtain the modal parameters,for the structure of service after the accumulation of seismic evaluation parameters,evaluation of the cantilever end human body comfort becomes focus on the problem.To sum up,it is necessary to carry out safety monitoring of the construction process of giant overhanging structure.Based on some typical giant cantilever construction process of structure safety monitoring project,for example,in the first place in the first chapter introduces the significance of large cantilever structure safety monitoring,this paper discusses the classification of safety monitoring,and surveillance of the static and dynamic characteristics tests of the commonly used method,provide the basis for later study.Then this article in the second chapter introduces the general situation of the project engineering,and the structure of plus or minus zero giant ring beam deformation monitoring method,process,and discusses the monitoring results,key is to select the facade giant steel truss rods process of stress and strain monitoring and data analysis to do a lot of research results.Then in chapter 3 with the dynamic characteristics of fa? Ade giant steel truss in testing,on the basis of modal parameter identification method,obtained the dynamic performance of the whole structure,using the finite element analysis software MIDAS-Gen do to this giant cantilever structure modal analysis,contrast the simulated values and measured values.In chapter 4,we select a typical room with the largest span of overhang and make a comfortable analysis,and compare the results with relevant specifications.The static monitoring results of the construction process show that the overall settlement amount is small.Good stress on key parts.The dynamic monitoring results show that the measured value of dynamic test is in good agreement with the simulated value.The hanging end is comfortably within safe range.The overall safety monitoring results show that the construction process is good and the project meets the design expectation.It aims to provide reference for the monitoring of the same type structure.