摘要
某槽形梁斜拉桥塔梁固结区采用预应力混凝土结构,槽形主梁在两侧与塔柱固结、主梁下设横梁与桥塔形成横向框架体系。为研究该槽形梁斜拉桥塔梁固结区的受力特性并验证结构安全性,采用有限元软件ANSYS建立塔梁固结区空间模型,验证模型正确性后分析固结区结构的应力分布情况,并探讨了槽形梁底板上缘与塔柱交接角、槽形梁过人洞与塔柱人洞交接角以及塔柱过人洞折角等构造细节对固结区应力的影响。结果表明:塔梁固结区整体应力满足使用要求,但存在局部应力集中现象。最大主压应力、最大主拉应力分别出现在槽形梁底板上缘与塔柱交接角处及槽形梁过人洞与下塔柱人洞交接角处。构造细节改进后,塔梁固结区应力集中程度明显降低。
The pylon and girder rigid fixity zone of a channel girder cable-stayed bridge is of the prestressed concrete structure. The two sides of the channel main girder of the bridge are rigidly fixed with the pylon column and under the main girder, the cross beam is arranged to form a lateral frame system together with the pylon column. To investigate the mechanical behavior and to check the structural safety of the rigid fixity zone of the bridge, the finite element software ANSYS was used to build up the spatial model for the zone and after the correctness of the model was checked, the stress distribution in the zone was analyzed. The influences of the intersection angles between the upper flanges of the channel girder bottom slab and the pylon column, between the passage openings in the channel girder and in the pylon column and the structural details of the bending angles of the passage opening in the pylon column on the stress in the zone were studied as well. The results of the study show that that the global stress of the pylon and girder rigid fixity zone can satisfy the service requirements, however the phenomenon of local stress concentration exists in the zone. The maximum principal compressive stress and tensile stress respectively appears in the intersection angles between the upper flanges of the channel girder bottom slab and the pylon column and between the passage openings in the channel girder and in the pylon column. After the structural detains there are improved, the degree of the stress concentration in the zone becomes obviously decreased.
出处
《桥梁建设》
EI
CSCD
北大核心
2013年第4期61-67,共7页
Bridge Construction
关键词
斜拉桥
塔梁固结
受力分析
应力
槽形梁
有限元法
cable-stayed bridge
pylon and girder rigid fixity
mechanical analysis
stress
channel girder
finite element method
