Study On The Key Questions Of Bridge Design For Long-span Rigid Beam-flexible Arch Composite Bridge

Long-span composite box bridges are characterized by the innovative configuration，beautiful shape. Currently，although the beam arch combination bridge has been somestudies，but the study to the architecture of the bridges composed by rigid arch and flexiblebeam is very few. In this paper，with An-Kang Han-jiang Bridge(AKHJB) as an engineeringbackground，intensive study on the static and dynamic characteristic for the combinationsystem of beam soft arch bridge．（1） Firstly，the finite element theory is used to establish the plane frame model inanalyzing the forces during the process of building．By changing the arch rib span ratio，comparing its impact on the beam arch combination of structural internal force distribution.Followed by the mechanical method，The three spans continuous beam arch combinationstructure when it was under the uniform load．Next，presented the expressions on ratio ofload sharing and ratio of moment sharing between beam and arch．To solve the load sharingratio of arch rib，arches and calculation formula of bending moment than and discuss thefactors influence on arch rib load share ratio．（2） Combined with the combination of firm beam soft arch system the mechanicalcharacteristics of the bridge，with the stress of the arch rib section on lower limb as thegoal，this paper proposes a reasonable suitable for the bridge into a completed bridgemethod．In addition to the completed construction process of tensioning sequence isoptimized．（3） In the overall analysis of the full-bridge on the establishment of the binding sitefor the arch of the foot space of refined finite element model，and local stress analysis;Finally arch segment space combined with the stress analysis results are given relative tothe Roof，web plate，plate，diaphragm plate the most unfavorable conditions plate stress andgives recommendations on the design of the arch segments combined．（4） On the basis of the analysis of dynamic characteristics，Further study of theseismic performance of the (AKHJB)．Analysis using the response spectrum and time history analysis of two kinds of analysis method．At last，by the comparison of results fromdifferent methods as well as different directions of earthquake action，the anti-seismicProperties of beams and arches are discussed generally in his thesis．...