Time-varying Mechanical For The Key Technical Research Of Construction Of Chongqing Chao Tian-men Yangtze Bridge

ChongQing Chao Tian-Men Yangtze Bridge is the first stepping dual-purpose arched bridge of highway and track in the world.This text is as the backing towards the bridge, ask for key technology of construction,such as tower rope strength,pressure weight and A10 node,etc. of this bridge,launched a series of research .This text turns the relation of time-varying mechanical and construction mechanics,and accord with the basic theories of method frozen in time of bridge construction mechanics,and confirms the control principle at the time of the design of this bridge,and puts forward the basic conception of the rational tower rope strength and the rigidity distributes law. This text calculates the rational tower rope strength under this bridge of main construction operating modes,and calculates the pressure weight under calculating every main operating mode. This text utilizes the space finite element procedure to carry on stress analysis by the method to push away to this bridge,and enumerats the result of calculation of the main construction operating mode, and selectes the key node in this bridge construct stage -A10 node,and carries on emulation to analyse and research to A10 node under the operating mode of " installed to E22 ".Then, this text has analysed the result of calculation and real bridge data,the result indicates that close basically,and states that the method of the rigidity distributes law to calculate tower rope strength,not merely convenient and swift and accurate,and has given consideration to the goal of controlled stress and controlled displacement,it is correct to state the idea and analysis method to calculate pressure weight at the same time. Next,carry on sress analysis to this bridge,indicate that the stress of this bridge of poles has not exceeded standard,the structure is safe.Through research of this text,solves some difficult points designed of oversize to step the steel construction trussed arched bridge of the foot-path,in the course of constructing;and offers the nodal design plan with rational economy that can be consulted for bridge of this type;the full text has run through the basic idea of construction mechanics,has used and done some preliminary exploration to study for the project of mechanics changed with time.