【摘要】 同时采用空间梁格模型和实体单元模型,对一座斜交角较大的预应力混凝土连续斜交桥梁进行模拟计算。通过对建模过程的描述,体现了空间梁格模型的实用性。通过对两种模型计算结果的对比分析,也指出梁格模型在模拟方面的可靠性和不足之处:由于空间梁格模型在施加预应力时,边肋的非对称性往往造成较大的平面外弯矩,因而引起很大的应力失真。针对这一现象指出在提取结果时应当注意的事项,这对以后类似斜交桥梁计算具有较大的参考价值。更多还原

【Abstract】 3D beam-grid model and entity-element model are used to calculate a prestressed skew-beam bridge. The process of modeling is described to validate the practicability of beam-grid model and give some advice to improve accuracy. By comparison of these two models, the accuracy and drawback of the beam-grid method is checked. When the beam-grid mode is prestressed, the dissymmetry of side beams brings forth great stress distortion. To solve the problem, some important advice on data collection is listed hereby for reference in calculation of similar bridges.更多还原