基于应力可行域法的斜拉桥合理成桥状态确定

发布时间：2018-07-23 12:27

【摘要】：现有确定斜拉桥合理成桥状态的方法主要有影响矩阵法和分布算法,但各自都有其局限性,鉴于此,提出将最小弯曲能量法和应力可行域法相结合形成分布算法,确定斜拉桥合理成桥状态。首先计算主梁恒载下的应力及其所有可变作用效应的应力包络图;其次根据预应力产生的应力和主梁可变作用效应的应力包络图,分别计算出主梁截面上、下缘在恒载作用下的应力可行域,形成应力判别图;然后根据应力判别图中主梁恒载应力与应力可行域的相互关系,调整成桥索力,使主梁恒载应力落在应力可行域中居中的位置,得到合理成桥状态。将该方法应用于一座单塔斜拉桥,计算结果表明该方法方便有效,整个优化过程将定性判断和定量判别相结合,优化效果直观。
[Abstract]:The existing methods for determining the reasonable bridge state of cable-stayed bridges mainly include the influence matrix method and the distribution algorithm, but each has its limitations. In view of this, the minimum bending energy method and the stress feasible region method are combined to form the distribution algorithm. Determine the reasonable state of the cable-stayed bridge. First, the stress envelope diagram of the main beam under dead load and all the variable effects is calculated. Secondly, according to the stress envelope diagram of the prestressed stress and the variable action effect of the main beam, the section of the main beam is calculated respectively. The stress feasible region of the lower edge under the action of dead load forms the stress discriminant diagram, and then adjusts the bridge cable force according to the relationship between the dead load stress and the stress feasible region of the main beam in the stress discriminant diagram. The dead load stress of the main beam is placed in the middle of the stress feasible region, and the reasonable bridge state is obtained. The method is applied to a single tower cable-stayed bridge. The calculation results show that the method is convenient and effective. The whole optimization process combines qualitative judgment with quantitative discrimination and the optimization effect is intuitionistic.
【作者单位】：大连理工大学土木工程学院;大连理工大学建筑设计研究院有限公司;大连普湾新区城市建设管理与行政执法局;
【分类号】：U448.27

【参考文献】