摘要
以1座下承式连续钢桁结合梁桥为例,采用有限元法研究其桥面系的受力特性,考察中支座区域桥面系受力状态与混凝土板板厚、纵梁抗拉刚度及抗弯刚度的关系;针对纵横梁及混凝土板在中支座区域受力比其他区域突出的问题,探讨解决方案。研究结果表明:在中支座两侧节间内,随着纵梁抗拉刚度的增加,纵梁轴力增加速度逐渐减小,且低于抗拉刚度的增加速度;随着纵梁抗弯刚度的增加,纵梁竖向弯矩也增加;采用较高的纵梁或增加混凝土板厚对降低中支座区域纵横梁的应力效果并不明显;选择合适的纵梁高度并增加翼缘厚度或采用4根小纵梁的方法均可降低该区域纵横梁的应力水平,在中支座两侧节间内再布置横梁时,纵横梁的应力可进一步降低。
Taking a through continuous truss composite bridge for example, several problems, including mechanical behavior of floor system, the influence of deck＇s thickness and longitudinal beam＇s tension/bending stiffness on load bearing in middle support region, were studied with the finite element method. And the methods were used to reduce the stress of floor system in the region. The results show that in the two panels near the middle support, increasing speed of longitudinal beam＇s axial force turns slow and less than that of tension stiffness with the growth of tension stiffness. Longitudinal beam＇s bending moment gets large with the increase of bending stiffness, and transversal beam at middle support bears more load with the increase of longitudinal beam＇s tension/bending stiffness and deck＇s thickness. So it is ineffectual to reduce the stress of longitudinal/transversal beam in the middle support region by increasing deck＇s thickness and longitudinal beam＇s height. On the contrary, the methods, such as choosing appropriate height of longitudinal beam or adopting four longitudinal beams can reduce the stress of longitudinal/transversal beam in the region, And adding transversal beam within the two panels near the middle support region, the stress can reduce further.
出处
《中南大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2008年第2期387-393,共7页
Journal of Central South University:Science and Technology
基金
铁道部科技发展计划项目(2003G003)
关键词
连续钢桁结合梁桥
桥面系
受力状态
刚度
continuous truss composite bridge
floor system
load bearing
stiffness
