连续刚构桥单箱两室截面主梁在偏载作用下的静力分析

发布时间：2018-02-27 05:07

本文关键词： 连续刚构桥偏载桥墩弯曲变形剪力滞静力分析　出处：《中北大学学报(自然科学版)》2017年05期 　论文类型：期刊论文

【摘要】：为了研究连续刚构桥单箱两室截面主梁在偏载作用下考虑剪力滞效应的力学特性,依据能量变分原理,考虑桥墩弯曲变形和主梁剪力滞效应,建立了单箱两室截面连续刚构桥在偏载作用下的力学模型.以三角函数为基函数表示主梁的位移,以幂函数表示桥墩的位移,得到了结构的刚度方程.据此计算了新九江大桥6×50m引桥在成桥荷载试验下的应变和挠度,并与测试结果进行了对比.结果表明,偏载作用下,主梁应变横向分布不均匀,加载应变大于非加载侧;腹板变形符合平面变形假定;若不考虑桥墩的弯曲变形影响,将高估连续刚构桥主梁的最大位移和最大应变;本文结果与测试值较为吻合.
[Abstract]:In order to study the mechanical properties of single box and two room cross-section main beam of continuous rigid frame bridge considering shear lag effect under eccentric load, according to the energy variational principle, the bending deformation of pier and shear lag effect of main beam are considered. The mechanical model of continuous rigid frame bridge with single box and two chambers is established. The displacement of main beam is expressed by trigonometric function, and the displacement of pier is expressed by power function. The stiffness equation of the structure is obtained. The strain and deflection of the 6 脳 50m approach bridge of Xinjiujiang Bridge under the load test of the bridge are calculated and compared with the test results. The results show that the transverse distribution of the main beam strain is not uniform under the action of partial load. The loading strain is larger than that of the non-loaded side; the web deformation accords with the plane deformation assumption; the maximum displacement and the maximum strain of the main beam of the continuous rigid frame bridge will be overestimated if the influence of the bending deformation of the pier is not considered. The results obtained in this paper are in good agreement with the measured values.
【作者单位】：佛山科学技术学院土木工程系;湖南大学土木工程学院;
【基金】：国家自然科学基金资助项目(10772046) 广东省自然科学基金资助项目(S2011010005037)
【分类号】：U441;U448.23

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