无伸缩缝桥梁荷载横向分布的影响参数分析  

Parametric Analysis of Transverse Load Distribution Factors for Jointless Bridges

作　　者：李秀芳[1,2] 高轩能[1] 

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

出　　处：《华侨大学学报（自然科学版）》2014年第1期82-87,共6页Journal of Huaqiao University(Natural Science)

基　　金：国家自然科学基金资助项目(51278208);福建省教育厅A类科技计划项目(JA12259);福建省高校产学合作科技重大项目(2012Y4010)

摘　　要：分析无伸缩缝桥梁荷载横向分布的影响参数,应用ANSYS有限元程序建立实桥的三维仿真模型.数值计算与实验数据的对比表明:所建有限元模型能很好地模拟该桥在荷载作用下的力学性能,且数值模型的承载力偏于安全.基于验证过的模型,评价等效桩长、桩的纵向抗弯刚度、桩的相对刚度、宽跨比等参数对荷载横向分布系数mc的影响性大小.结果表明:跨中mc随着等效桩长的增加而减小,当等效桩长超过一定值后,这一规律趋于收敛;桥梁边梁mc随着桩纵向抗弯刚度的减弱而变小;宽跨比越小,荷载横向分布影响线斜率越大,mc相应变大;宽跨比低时,mc没有显著差异,差值≤1.6%;宽跨比超过0.4之后,mc随着桥宽加大呈直线下降,最大差值达17.34%.A three-dimensional simulation model for the actual bridge with integral abutment was established by the finite element program ANSYS to analysis the influence parameters of load transverse distribution （mc） in jointless bridge. The comparative analysis between numerical results and experimental results shows that the mechanical behavior of the test bridge could be well simulated in FEA model and the bearing capacity of the model conservative. Based on the proven model, the influence parameters of load transverse distribution in jointless bridge are discussed, including the effective pile length （lc）, the bending stiffness of pile, the comparative bending stiffness of pile and the width-span ratio （B/L）. The research results show that the mc decreases gradually with the increase of lc, when lo reaches a certain value, mc converges to a stable state. The mc of boundary beam decreases with the decrease f the longitudinal bending stiffness. The smaller the B/L causes the greater slop of influence line of load transverse distribution and me. The mc decreases slowly when B/ L〈0.4, the difference-value is less than 1.6 %. When B/L〉0. 4, the mc will decrease linearly with the increase of the bridge width, the maximum difference-value is about 17.34%.

关 键 词：桥梁 无伸缩缝 荷载 横向分布 影响参数 数值模型 

分 类 号：U448.21[建筑科学—桥梁与隧道工程]