双柱式墩盖梁内力影响因素分析及预应力束布置

用MIDAS对双柱式盖梁进行整体有限元分析,分别比较盖梁高度、桥墩间距和桥墩高度对盖梁控制截面内力的影响,从而为盖梁在不同受力情况下预应力束的合理布置提供依据;同时通过工程实例可得:正确的选取结构计算模型为盖梁预应力束的布置数量和位置奠定了基础。分析表明,当桥墩间距一定时,盖梁高度对盖梁内力影响很小;当盖梁高度一定时,桥墩间距对盖梁内力影响很大,盖梁跨中弯矩随桥墩间距的增大而增大,盖梁支点弯矩随桥墩间距的增大而减小;随着桥墩高度的减小,盖梁跨中弯矩有增大的趋势,支点弯矩有减小的趋势。

Internal Force of Double-Column Pier Coping and Prestress Tendon

The finite element of double-column coping was analyzed by MIDAS.The influence of coping height,pier spacing,and pier height on the control section internal forces of coping was compared separately,so as to provide the basis for the reasonable prestress tendon distribution under different forces of coping.Through engineering examples,the correct selection of structure calculation model lays the foundation for the number and location of prestress tendon.The analysis shows that when the distance of the pier is fixed,copping beam height has little influence on internal force;while the copping beam height is fixed,the distance of the pier has tremendous influence on internal force of the copping beam,the bending moment in the middle span increases with the pier distance,but it goes opposite in the fulcrum of copping beam.With the pier height goes down,the bending moment has the tendency of increasing in the midspan and reducing in the fulcrum.