CAJ | 학술논문

针对采用板壳有限元方法计算悬索桥板桁结合型加劲梁桥面系剪力滞的建模工作量巨大、效率低下的情况，根据该类结构剪力滞的特性，研究其简化计算方法。该方法采用换算梁法将板桁结合桥面系桁梁换算为连续薄壁梁；建立能够考虑剪切变形影响的单主梁悬索桥有限元模型；以变分法为基础，将考虑了结构几何非线性影响的加载影响区间作为等效简支梁的跨度，将作用于该区间的活载、吊索力和支座反力作为荷载；根据叠加原理进行组合荷载作用下的剪力滞求解。以拟修建的某铁路悬索桥为例，采用ANSYS建立全桥板壳有限元模型与简化方法进行对比分析，结果表明简化方法具有较高的计算精度。
침대채용판각유한원방법계산현색교판항결합형가경량교면계전력체적건모공작량거대、효솔저하적정황，근거해류결구전력체적특성，연구기간화계산방법。해방법채용환산량법장판항결합교면계항량환산위련속박벽량；건립능구고필전절변형영향적단주량현색교유한원모형；이변분법위기출，장고필료결구궤하비선성영향적가재영향구간작위등효간지량적과도，장작용우해구간적활재、조색력화지좌반력작위하재；근거첩가원리진행조합하재작용하적전력체구해。이의수건적모철로현색교위례，채용ANSYS건립전교판각유한원모형여간화방법진행대비분석，결과표명간화방법구유교고적계산정도。
T he simplified calculation method for the shear lag of floor system of the plate and truss composite stiffening girder of suspension bridge was researched in the light of the shear lag characteristics of such type of the structure because the work load of modeling for calculating the shear lag ,using the plate and shell finite element method was enormous and the working efficiency was low .In the simplified method ,the truss in the floor system was converted into a continuous thin‐wall girder by the equivalent beam method and the finite element model of the single main girder suspension bridge that could consider the shear deformation influences w as set up .Based on the variational calculus ,the loading influential intervals that considered the structural geometric nonlinearity influences were taken as the span length of an equivalent simply‐supported girder ,the live load ,suspender forces and bearing reaction forces acting on the intervals were taken as the loads and the shear lag under the action of the combination load was solved on the principle of su‐perposition .By way of example of a railway suspension bridge to be built ,the ANSYS was used to set up the plate and shell finite element model for the w hole bridge of the bridge and the calculation of the shear lag of the model w as analyzed and compared to that implemented by the simplified method .The results of the analysis and comparison proved that the simplified method has high cal‐culation accuracy .