易伟建1?覮,颜良1,彭真2.无腋角综合管廊结构足尺模型 静载试验与有限元分析[J].湖南大学学报:自然科学版,2019,(7):1~10
无腋角综合管廊结构足尺模型 静载试验与有限元分析
Static Load Test and Finite Element Analysis on Full-scale Model of Utility Tunnel Structure without Axillary Angle
  
DOI:
中文关键词:  无腋角综合管廊  足尺试验  有限元分析  均布荷载  裂缝控制
英文关键词:utility tunnel without axillary angle  full-scale test  finite element analysis  static load  crack control
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作者单位
易伟建1?覮,颜良1,彭真2 (1.湖南大学 土木工程学院湖南 长沙 410082 2.中南市政工程中南设计研究总院有限公司湖北 武汉 430014) 
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中文摘要:
      装配整体式混凝土管廊结构一般不设置腋角,为研究无腋角综合管廊结构的破坏机制、承载能力以及裂缝状况,完成一个多舱无腋角综合管廊节段足尺模型集中荷载下的静载试验,并与带腋角节段模型进行比较. 试验结果表明:集中荷载作用下,管廊长跨顶板裂缝宽度达到短期作用下的裂缝宽度限值0.133 mm为控制条件,顶板最终发生剪切破坏. 建立有限元模型并利用试验结果加以验证,采用非线性有限元方法分析管廊节段模型,结果表明均布荷载和集中荷载下节段模型的力学性能基本相同. 根据节段模型试验和非线性有限元分析可知,无腋角和带腋角管廊结构的设计控制条件均为最大裂缝宽度,但最终破坏均为顶板的剪切破坏. 适当增加管廊顶板的纵筋配筋率,不带腋角的管廊结构性能与带腋角的管廊结构性能接近.
英文摘要:
      Monolithic precast concrete utility tunnel structure generally does not set the axillary angle. In order to study the failure mechanism, bearing capacity and crack condition of the structure of the utility tunnel without axillary angle, a static concentric load test was performed on the full-scale model of a multicellular utility tunnel with and without axillary angle. The results showed that the crack width of the long span roof of the utility tunnel reached a short time limit of 0.133 mm for the control condition,and the roof finally showed shearing damage. The finite element model was established and the test results were used to verify the model. Then, the nonlinear finite element method was used to analyze the utility tunnel model,and the results show that the mechanical properties of the section model under both uniform load and concentric load are basically the same. According to the segmental model test and nonlinear finite element analysis, the design control conditions for the utility tunnel structure with and without axillary angle are the maximum crack width, but the ultimate damage is the shearing failure of the roof. The structure performance of the utility tunnel without axillary angle is close to that of the utility tunnel with axillary angle by properly increasing the longitudinal bar ratio of the roof.
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