摘要
管幕箱涵一体化隧道结构是打通城市新建道路与既有道路相交形成的断头路的新型地下穿越通道结构,结构横截面抗剪性能对确保隧道安全至关重要。为研究该结构的抗剪性能,开展足尺抗剪试验验证了结构的抗剪能力并明确了结构破坏模式,建立有限元分析模型分析了填充混凝土强度、钢板强度、腹板厚度和CT形一体化接头长度对抗剪承载力的影响,并基于抗剪试验现象和有限元分析结果推导了抗剪承载力理论计算公式。试验与理论分析结果表明:CT形一体化接头的脱空破坏导致结构刚性显著减弱引导结构破坏;结构破坏模式主要表现为临界斜裂缝贯通破坏、跨中竖向剪切裂缝贯通破坏和CT形一体化接头区域受剪破坏;抗剪承载力随着材料强度的提高而提高,相比于填充混凝土,钢板的强度提升对抗剪承载力的提升效果更加明显;腹板厚度对抗剪承载力的影响最显著,腹板增厚66.67%能够引起44.54%的承载力提升;CT形一体化接头长度越小,抗剪承载力越大,但影响效果较小,53.33%的接头长度变化只能造成7.71%的承载力变化;根据从试验现象和有限元分析结果总结得到的合理理论假定、混凝土斜压杆传力机制和接头三角区破坏推导的抗剪承载力理论计算公式,考虑了腹板和CT形一体化接头的影响,能够以很小的误差(平均误差-2.30%、标准偏差2.75%)预测试验和有限元分析的抗剪承载力结果。
The pipe roof-box culvert integration tunnel structure is a novel underpass structure that solves the traffic bottleneck formed by the intersection of new urban roads and existing roads,its shear behavior is crucial to ensure the safety of the tunnel.To study the shear behavior of this structure,a full-scale shear test was conducted to verify the shear resistance and determine the failure mode.Finite element analysis models were established to analyze the effects of the filling concrete strength,steel plate strength,web plate thickness,and CT-shaped integrated joint length on the shear bearing capacity.And a theoretical calculation formula for shear bearing capacity was derived based on the test phenomena and finite element analysis results.The experimental and theoretical analysis results indicate that the void failure of the CT-shaped integrated joint leads to a significant reduction in structural rigidity,leading to structural failure;The main structural failure modes are critical diagonal crack penetration failure,mid span vertical shear crack penetration failure,and shear failure in the CT shaped integrated joint area;The shear bearing capacity increases with the increase of material strength.Compared to filling concrete,the strength improvement of steel plates has a more significant effect on the shear bearing capacity;The thickness of the web plate has the most significant impact on the shear bearing capacity,with an increase of 66.67%in web plate thickness leading to an increase of 44.54%in bearing capacity;The smaller the length of the CT-shaped integrated joint,the greater the shear bearing capacity,but the effect is relatively small.53.33%of the joint length change can only cause 7.71%of the bearing capacity change;Based on reasonable theoretical assumptions summarized from experimental phenomena and finite element analysis results,the shear bearing capacity theoretical calculation formula derived from the force transmission mechanism of concrete diagonal compression strut and the triangular area failure around the joint takes into account the influence of web plates and CT-shaped integrated joints,and can predict the shear bearing capacity results of experiments and finite element analysis with very small errors(average error-2.30%,standard deviation 2.75%).
作者
谢雄耀
邹佳
周彪
戴清
韩建军
曾英俊
XIE Xiong-yao;ZOU Jia;ZHOU Biao;DAI Qing;HAN Jian-jun;ZENG Ying-jun(College of Civil Engineering,Tongji University,Shanghai 200092,China;Shanghai Architectural and Engineering Consultants Co.Ltd.,Shanghai 200092,China;Shanghai Research Institute of Building Sciences Co.Ltd.,Shanghai 200092,China;Shanghai Urban Construction Municipal Engineering Co.Ltd.,Shanghai 200092,China)
出处
《中国公路学报》
EI
CAS
CSCD
北大核心
2023年第11期278-288,共11页
China Journal of Highway and Transport
基金
国家自然科学基金项目(52038008)
上海市科委项目(22DZ1203004,20DZ1202004)
国网上海市电力公司科技项目(52090W220001)。
关键词
隧道工程
抗剪性能
足尺试验
管幕箱涵一体化隧道结构
CT形一体化接头
tunnel engineering
shear behavior
full-scale shear test
pipe roof-box culvert integration tunnel structure
CT-shaped integrated joint
