Construction Monitoring Of Self-anchored Suspension Bridge

Self-anchored suspension bridge is is a kind of suspension bridge system,in which the main cable is anchored at the end of stiffening beam without gravity anchor,and the horizontal and vertical components of the end of the main cable are borne.Compared with the conventional suspension bridge,the self anchored suspension bridge has a beautiful construction structure and strong adaptability to geological conditions,but its structural stress problem is relatively complex,involving multiple system transformations in the construction process.Therefore,through comprehensive and scientific construction monitoring work,through scientific prediction,data analysis,onsite control and other methods in all stages of construction,the bridge structure stress and bridge line are guaranteed The shape is consistent with the ideal design state,which is very important for the successful completion of self anchored suspension bridge.In this paper,the whole construction monitoring of self anchored suspension bridge is taken as the research object,including the following research contents:(1)According to the existing requirements of the overall construction control,through the analysis of the main influence parameters,combined with the previous research results,the construction monitoring method combining adaptive control and stress-free length control is proposed;(2)In this paper,the characteristics and principles of suspender tension are defined,three different feasible schemes are put forward correspondingly,and the optimal scheme is determined by comparing the suspender cable force,bridge tower stress and tower top displacement of the three schemes in the process of tension;(3)Midas civil 2013 beam grid model is established and verified to determine the correctness of the model;the reasonable completion state and main data of each construction stage are obtained by using the model analysis.(4)the actual and theoretical values of the final overall bridge stress,line shape,tower deviation and other data are compared and the reasons for the errors are analyzed.According to the comparison results,it is shown that the monitoring scheme adopted in this paper can be used as a reference for the construction monitoring of Bridges of the same type.