无伸缩缝桥梁荷载横向分布系数的有限元分析  

FEA of Transverse Load Distribution Factors for Jointless Bridge

作　　者：李秀芳[1,2] 吴锐福 

机构地区：[1]厦门理工学院土木工程与建筑学院,福建厦门361024 [2]华侨大学土木工程学院,福建厦门361021 [3]厦门市公路局,福建厦门361009

出　　处：《公路交通科技》2013年第12期86-92,共7页Journal of Highway and Transportation Research and Development

基　　金：福建省教育厅A类项目(JA12259);国家自然科学基金项目(51278208);福建省科技计划重大项目(2012Y4010)

摘　　要：建立ANSYS模型模拟整体式桥台无伸缩缝桥梁,比较半波正弦荷载、均布荷载和集中荷载3种不同的加载方式对荷载横向分布影响线(ILTLD)的影响,对比分析挠度、内力2种不同物理量荷载横向分布系数m c,分析无伸缩缝桥梁m c沿桥跨的变化规律,讨论了无伸缩缝桥梁由于内横梁对桥面系刚度贡献引起的荷载横向分布变化。与传统简支桥梁、无伸缩缝斜交桥对比分析荷载的横向分布,同时,通过试验验证了FEA的准确性、可行性。试验和分析结果发现:在无伸缩缝桥梁中,可以采用单位集中荷载下挠度的ILTLD来研究荷载横向分布规律;无伸缩缝桥梁的荷载横向分布较简支梁更加均匀;FEA计算结果和试验模型的测试结果吻合良好,并可以在全桥跨近似取值m=m c。The ANSYS model is established for simulating jointless bridges in integral abutments. The effects of different load types （half-wave sinusoidal load, uniform load and concentrated load） on the influence line of transverse load distribution （ILTLD） is compared. The load lateral distribution factor （ mc ） of internal force and deflection are compared and analyzed. The changing regularity of load lateral distribution factor along span is analysed. The change of load lateral distribution due to the interior crossbeams contribute to the stiffness of deck system of jointless bridge is discussed. Then, load lateral distributions of conventional simply supported bridge and jointless bridge are compared and analyzed, and the accuracy and feasibility of the FEA model is verified by test. The test and analysis results show that the ILTLD of deflection under unit concentrated load can be used to study the load lateral distribution pattern; the load lateral distribution pattern of jointless bridge is more evenly than that of simply supported bridge. The test data agree well with the calculated values by FEA, and the load lateral distribution factor mc can be adopted as that of the whole span, that is m = mc.

关 键 词：桥梁工程 无伸缩缝桥梁 荷载横向分布系数 荷载横向分布影响线 

分 类 号：U448.21[建筑科学—桥梁与隧道工程]