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Reaserch on the Long-Term Creep Deflection of Prestressing Concrete Continuous Rigid Frame Bridges

Author: GaoShuangJian
Tutor: XiangTianYu
School: Southwest Jiaotong University
Course: Bridge and Tunnel Engineering
Keywords: Large span continuous rigid frame bridge Creep effect Loss of prestress Cross Deflection Cracking
CLC: U448.23
Type: Master's thesis
Year: 2011
Downloads: 30
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Abstract


With the rapid development of China 's transport undertakings , large span continuous rigid frame bridge simple and beautiful styling , ride comfort , conservation , convenience and low cost construction is widely used , and has become a very competitive within the range of 250 m span bridge type . Certainly our bridges career achievements should see early construction girder bridge also exposed to varying degrees across the middle and lower - scratch disease , current research how to control the continuous rigid frame bridge creep the long scratch on the significance . The Laoshan Bridge relying on engineering, launched a study of the impact of continuous rigid frame bridge the long-term deflection . First introduces the the concrete creep basic theory , analysis of the creep effect of continuous rigid frame bridge deflection as well as the sensitivity of the main factors affect creep ; Second prestress loss calculation method of analysis the prestress loss as well as friction parameter μ k value rigid frame bridge deflection ; finally pointed out the inadequacies of the current settings Precamber , and explore several possible options to control the deflection continuous rigid frame bridge the long-term . Comprehensive research on this thesis, the following main conclusions : factors affecting the characteristics of concrete creep has a complex and extensive , it is necessary to carry out a small amount of targeted short-term trials to fix the parameters of the model , the forecast model is more in line with certain the specific concrete creep characteristics ; creep effect of continuous rigid frame bridge deflection rely solely on the theoretical calculation is unreliable and must be corrected through real-time monitoring of the theoretical results ; recommended the construction of temporary cable auxiliary control under continuous rigid frame flex for new ideas have emerged disease bridge external prestressing reinforcement , another can try on the design described in this paper .

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CLC: > Transportation > Road transport > Bridges and Culverts > All kinds of bridges > Bridge: Structure > Rigid Frame Bridge
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