期刊论文

Experimental investigation for concrete cable-stayed bridges with long-span

中文

长安大学学报(自然科学版)

1671-8879

2019

39

5

78-87

10.19721/j.cnki.1671-8879.2019.05.009

国家重点基础研究发展计划(“973”计划)项目(2015CB057706) 国家自然科学基金项目(51678068) 湖南省自然科学基金项目(2017JJ5029) 湖南省教育厅科学研究项目(18B140)

本校为第一机构

为在有限的空间内进行具有足够精度的模型试验以体现斜拉桥整体受力特点,提出了混凝土斜拉桥节段缩尺相似法的模型试验方法。选择主梁塑性最强的跨中附近区域作为试验节段,在节段两端设置无索区并施以弹性支撑,以模拟原结构在边界处的受力状态并消除边界模拟的误差;调整无索区长度和两端弹性支撑刚度,直至试验梁和在外荷载作用下控制截面和控制索的内力增量与原结构保持一致,以正确反映整体结构的受力特征;确定缩尺比例、制作试验梁段和弹簧支座,以混凝土裂缝宽度为控制指标设计了加载工况并完成了加载试验,并对局部节段和整体模型控制截面的计算和实测结果进行对比。试验结果表明:在弹性受力范...

A nonlinear local-global design method test for concrete cable-stayed bridges was proposed, to simulate the spatial structural behavior while considering both the model space and test accuracy, and to reflect the overall mechanical characteristics of cable-stayed bridges. The mid-span region of main girder with the strongest plasticity was selected as the test section. A cable-free zone was set at both ends of the segment, and an elastic support was applied, to simulate the stress states of the original structure at its boundaries and eliminate simulation errors. The length of the cable-free z...