采用組合法施工的主拱圈線形與應(yīng)力控制技術(shù)研究
[Abstract]:In the past 30 years, a large number of long-span concrete arch bridges have been constructed by means of cast-in-place support method, cable hoisting method, rigid skeleton method and rotating construction method. Since 60's of last century, most of the long-span concrete arch bridges abroad have adopted cantilever pouring method or cantilever casting combined with rigid skeleton construction method. In this century, three reinforced concrete arch bridges have been constructed by cantilever casting method, but the combined construction method of cantilever casting and rigid skeleton has not been studied. Based on the Science and Technology Project "Design and Construction Technology Research of suspended reinforced concrete Box Arch Bridge" (2011 / 12 / 034), this paper takes the 210m Yilang Lake Bridge as the research object. The following research work is carried out as follows: 1 on the basis of collecting and arranging the domestic and foreign research results, the control method and calculation analysis theory used in the construction of cable-stayed bridge, continuous beam bridge and other bridge cantilever casting are used for reference. The construction control method of cantilever pouring of reinforced concrete arch bridge is studied and a set of control system suitable for cantilever pouring construction of reinforced concrete arch bridge is established. 2According to the construction process of cantilever pouring of Yulanghu Bridge, Based on the characteristics of low tensile performance of concrete, the research on "forward analysis algorithm of stress control with predictive mechanism" is carried out in this paper. The stress on the upper and lower edge of the main arch ring concrete in the suspension stage is taken as the constraint variable, and the stress on the bottom edge of concrete is considered as the constraint variable. Combined with the current formed segment fastening force, the feasible zone of tension is obtained, and the tension mode of the cable can be automatically judged by using this feasible region (removing the tension fastener, pouring the whole segment once, pulling once, pouring grade by stage, etc., and using this feasible region) can be used to determine the tension mode of the cable automatically (removing the tension fastener, casting the whole segment once, pulling once, pouring grade by grade. Split tension) and tension. Using APDL language of ANSYS, the calculation and analysis program of reinforced concrete arch bridge using cantilever casting and rigid skeleton combination construction has been developed. 3 the mechanical analysis of rigid frame erection and outside concrete pouring stage has been carried out. The influence of concrete pouring mode on the shape and stress of the main arch ring is discussed.
【學(xué)位授予單位】:重慶交通大學(xué)
【學(xué)位級別】:碩士
【學(xué)位授予年份】:2015
【分類號】:U445.4;U448.22
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