| Because of natural disasters, bridge structure disease or overload causes, bridgecollapse fracture accidents often happen. The bridge is usually an important node Road,disruption of the bridge will greatly affect the disaster rescue, car travel, the emergencytemporary traffic bridge emerges as the times requiring. The traditional emergencybridge ("321" Bailey bridge) build conveniently, however it can only be used asemergency temporary bridge, later it need to demolition and reconstruction a new one,this leads to traffic disruption or choosing other bridge issues. This paper relies on theChongqing city traffic science and technology project "The fast assembling emergencybridge and change it into a permanent bridge technology research", it puts forward forquick-assembly type steel concrete composite bridge to emergency use, its structure,design and construction method are studied, the main research contents and results asfollows:①The rapid assembly of steel-concrete composite bridge for emergency use,girders are precast concrete bridge deck and steel girder composite structure, which notonly can restore the traffic within a relatively short time, ensure that the disaster relief,travel and other emergency needs, but also can avoid the repeated construction of theemergency bridge and the long-term bridge, it easily and quickly realizes the translationof emergency bridge to long-term bridge, it is conducive to save resource and protectenvironmental.②The rapid assembly of steel-concrete composite bridge consists of steel deckemergency bridge and concrete bridge deck emergency bridge according to thetemporary bridge panel material in emergency building. The construction speed of steeldeck bridge is faster for concrete deck bridge, and the erection of steel deck bridge ismore convenient, but when turning to the long-term bridge the concrete deck is moreconvenient and efficient. Through the force analysis of the whole process of the twoschemes, its feasibility is verified.③The rapid assembly type steel-concrete composite bridge for emergency use, thegirder structure, design load, strength and stiffness requirements and other aspects havedifferent requirements in emergency bridge and the long bridge phase, this paper hasstudied the design method. It based on the theory of structure optimization to establish acontrol condition equation of the main beam of steel and concrete stress using the material cost as objective function. In the characteristics calculation of sections of thecomposite girder it used the reasonable assumptions and simplification, it proposed thesteel-concrete composite beam design optimization method and through the mat labprogram to realize. The optimization calculation procedure can be based on the bridgespan, bridge width, the load parameters quickly calculate the main parameters of thenumber of girder, section type and size.④For the rapid assembly of steel-concrete composite bridges for emergency usestructure and construction requirements, it used the steel truss cross link structure andfinite element software of Abaques to establish the fine solid model analysis of steeltruss mechanical behavior and to design its structure. Cross linked with the upper andlower chords asymmetric design, supporting plate is provided with a set of edge effectson the top deck steel truss tie chords to reducing the displacement difference betweenboth sides bridge panel gap under wheel loads. Analysis shows that the bridge deckdisplacement difference can reduce to21.23%~54.45%when it sets the supporting platethan not.⑤By using the MIDAS, as the performance analysis of the transverse distributionparameter of the beam bridge, this paper compared the beam lattice of spatial finiteelement calculation results with traditional method. This paper by means of calculatingthickness of bridge deck is suitable for correcting the hinge plates method of similarI-steel and concrete bridge deck composite structure (beam). Comparison showed thatthe correction hinge plates (beam) method is similar with beam space finite elementresults. |
PDF Full Text Request