| The leaning-type arch bridge is a new type of bridge consisted of arch ribs andthe deck system. All the tied booms of the main arch rids and stable rids combine thearch rids and roadway by the medial horizontal beam of the bridge deck system. Forthe lacking of medial horizontal beam between the main arch ribs, lateral stabilitybecomes the key factor of safety design. Leaning-type arch ribs with differentcurvature and the leaning-type arch bridge are studied in this paper, and the flowingresearches are performed:Under the condition of consolidation for main arch rids and stable rids,displacement functions with different curvature are built for the first time. Analyticalsolution of critical loading conditions for lateral instability is also deduced. All theresults are verified in case study by finite element method.Influencing rules of the curvature parameters for critical load for lateralinstability of leaning-type arch ribs are revealed. And effects of main arch rids, stablerids, lateral brace stiffness and stability of arch rib obliquity on the critical load arefurther studied. The results show that the critical load is not affected by increasing ofcurvature of stable rids, when the curvature of main arch ribs keeps a constant.Leaning-type arch ribs with different curvature and the leaning-type arch bridgeare studied in this paper for the first time. Effects of influence of non-keep-directionforce are considered, and calculation method of the critical load is proposed. At thesame time the theoretical results are compared with the results of finite elementanalysis, and the calculation method is verified to be reliable.The curvature parameters effects on the critical load for instability areillustrated. Effects of the main arch rids stiffness and span ratio, stable rids stiffnessand dip angle, medial horizontal beam stiffness and design parameters of the deck,are also considered. Relative rules are concluded for the design of the leaning-typearch bridge. |
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