摘要
本文以悬链线拱桥娄底市沙江桥为研究对象,通过MIDAS CIVIL计算软件建立拱桥的有限元计算模型,对服役后的石砌桥的挠度和应变进行仿真模拟,并结合多工况条件下的现场静载试验,研究其现阶段的实际承载能力.试验结果和理论分析表明,沙江桥在各种不利荷载作用下各关键部位都没有出现拉应力,且不存在明显的应力集中现象,实测应变与计算结果吻合比较好,拱脚处最大沉降量为0.002 mm,最大实测水平位移为0.152 mm,均不影响该桥的正常使用;拱顶关键控制截面承载力均大于相应荷载组合下的最不利内力值,在公路-Ⅱ级荷载下的承载能力均能满足要求.本文计算方法和有限元计算模型可较为准确地计算悬链线拱桥承载能力,计算数据可为悬链线拱桥的数值仿真计算提供参考,计算结果可弥补试验数据不足等.
Taking Shajiang Bridge, a catenary arch bridge in Loudi as the research object, the finite element model of arch bridge through MIDAS CIVIL calculation software is established. Combining with multi operating condition static load test, the deflection and strainof stone bridge in use is simulated to study actual bearing capacity at present. Test results and theoretical analysis show that tensile stress does not appear in the key parts of Shajiang Bridge under adverse load, and there is no obvious stress concentration phenomenon. Measured strainis corresponding to the calculation results.The largest settling volume at the arch foot is 0.002 mm, the largest the measured horizontal displacement 0.152 mm, which do not affect the normal use of the bridge;Vault control section bearing capacity is greater than the corresponding load under the most unfavorable internal force value, which can satisfy the requirements of the highway load bearing capacitylevel II. The calculation method and finite element calculation model can calculatethe catenary arch bridge bearing capacitymore accurately. The calculation data of catenary arch bridge can offer reference to the numerical simulation calculation. The calculation results can make up the lack of experimental data.
作者
张志坚
ZHANG Zhijian(Chengdu Branch of China Railway No.5 Engineering Group Co., LTD, Chengdu, Sichuan 610000, China)
出处
《湖南城市学院学报（自然科学版）》
CAS
2017年第4期26-32,共7页
Journal of Hunan City University:Natural Science
作者简介
张志坚（1976-），男，湖南浏阳人，工程师，主要从事交通土建工程研究．E-mail：244949212@qq．com
