Multisectio Curved Line Steel-concrete Composite Continuous Beam Negative Moment Construction Simulation And Control

Steel-Concrete composite beam includes higher tensile properties of steel andgives full play the characteristics of high compressive strength of concrete.Steel-Concrete composite beam is widely applied in modern large span bridges andother structural engineering. There are many common about structural design andconstruction technology between the trestle of port project and continuous beambridge of bridge engineering, which can learn from each other. If the compositestructure can be successfully introduced into waterway engineering construction,which can overcome the common unfavorable natural conditions such asdepth ,strong wind, wave height in the wharf trestle design and construction. Thespan trestle can reduce the number of deepwater foundation, greatly reduce projectcost, create a better economic and social benefits, promote waterway cause healthyand rapid development. However, the negative moment area of continuouscomposite beam medium support produce the unfavorable conditions of steelcompressed and concrete pulled, which may induce the bridge deck concreteslab cracking and affect the durability and service life of structure. The cracks ofbridge deck concrete due to being pulled can be solved through the impositionof certain pre stressed bridge deck concrete.Taking combined with construction of the steel-concrete composite beam as anexample, this paper establish the elaborate finite element model of the mixingunit by adopting the large scaled finite element software ANSYS12.0. It issimulation analyzed that the mechanical characteristics of the whole composite beamnegative moment construction process. The whole combine construction process isall-round monitored according to monitoring scheme detailed made on the result ofsimulation analysis and the characteristics of field construction. The constructioncontrol suggestion put forward provides a certain reference about design andconstruction of similar composite beam. The main contents are as follows:(1)Introducing the application prospect on the steel-concrete composite beamin the port and water way engineering, explaining the calculation theory oncalculation of bending strength of composite beam negative moment and theprocessing method of negative moment area.(2)Combining with the bridge composite beam construction process, according to the geometric features and the mechanical characteristics of the structure, base onelasticity theory assuming, amplifying the creation process of finite element modeland carrying on construction simulation analysis.(3)Through analysis the result of finite element of the stress of steel beam, thetop lift and anchoring force, this paper determine the key of construction control andprovide effective proof for picking the construction machinery equipment.(4)This paper formulates a detailed and feasible scheme and real-time monitorthe construction process. Analyzing the monitoring data, the results showthat the method can effectively exert compressive stress on the bridge deck concrete,the steel beam structure is safe and under control, construction equip-ment meet the requirements of construction.(5)By comparing the theoretical data and the monitoring data, this paper identi-fy construction control parameter, put forward the construction control suggestion,attempt to establish a multi-first-order linear regression model for bridge deck conc-rete compressive stress prediction, the predicted and measured values are very close.