摘要
【目的】重力式锚碇悬索桥由于其优越的跨越能力和适用性,被广泛应用于江河峡谷区域的工程建设。重力式锚碇的安全性能评估对工程的设计和施工具有重要意义。【方法】以锚碇-地基结构为研究对象,建立了典型重力式锚碇-地基系统概化模型,构造了(V-M-H)破坏面方程,并提出了几何意义更为明确的改进形式;进而提出了基于V-M-H破坏面的荷载路径相关(LPD)安全系数计算方法,形成了重力式锚碇-地基系统安全评价体系。以云南某大桥典型重力式锚碇工程为依托,应用建立的重力式锚碇-地基系统安全评价体系,计算了设计工况下锚碇-地基LPD安全系数,并与采用有限差分法的结果进行比较。【结果】采用重力式锚碇-地基系统安全评价体系计算所得极限缆力荷载为1826652 kN,LPD安全系数为6.49;采用有限差分法建立了相应的数值计算模型,计算所得极限缆力荷载为2022468 kN,与理论计算结果基本保持一致。【结论】通过对比仿真试验结果,进一步验证了所提方法的有效性。本研究相关方法和结论可为工程设计和施工提供指导,也可为类似工程的建设提供参考。
[Objective]Gravity anchor suspension bridges are widely used in engineering construction in river and valley areas due to the superior spanning capacity and applicability.The gravity anchor safety performance evaluation is of great significance to the project design and construction.[Method]Taking the anchor-foundation structure as the study object,a generalized model of typical gravity anchor-foundation system was established.The vertical,moment and horizontal loading(V-M-H)failure surface equation was constructed.An improved form with clearer geometrical significance was put forward.The load path dependent(LPD)safety factor calculation method was proposed based on V-M-H failure surface.The gravity anchor-foundation system safety evaluation system was formed.Based on a typical bridge gravity anchor project in Yunnan province,the anchor-foundation LPD safety factor under the designed working condition was calculated by using the established gravity anchor-foundation system safety evaluation system.The result was compared with those with finite-difference method.[Result]The ultimate cable force load,calculated with gravity anchor-foundation system safety evaluation system,is 1826652 kN,and the LPD safety factor is 6.49.The corresponding numerical computation model is established by using the finite difference method.The ultimate cable force load is 2022468 kN,which is basically the same as the theoretical calculation result.[Conclusion]The proposed method effectiveness is further verified by comparing the simulation test result.The relevant methods and conclusions of this study can provide the guidance for engineering design and construction,and also provide the reference for similar project construction.
作者
陈伟
田明
钱云华
杜宇翔
陈贺
康景宇
CHEN Wei;TIAN Ming;QIAN Yunhua;DU Yuxiang;CHEN He;KANG Jingyu(Dali Dayang Eryun Expressway Co.,Ltd.,Dali,Yunnan 671000,China;State Key Laboratory of Precision Blasting,Jianghan University,Wuhan,Hubei 430056,China;Broadvision Engineering Consultants,Kunming,Yunnan 650041,China;State Key Laboratory of Geomechanics and Geotechnical Engineering,Institute of Rock and Soil Mechanics,Chinese Academy of Sciences,Wuhan,Hubei 430071,China)
出处
《公路交通科技》
北大核心
2025年第3期195-203,共9页
Journal of Highway and Transportation Research and Development
基金
国家自然科学基金项目(52179117,52209131)
云南交投科技创新计划项目(YCIC-YF-2022-17)
兴滇英才支持计划项目([2022]51)。
关键词
桥梁工程
重力式锚碇
V-M-H破坏面
性能评估
安全系数
bridge engineering
gravity anchor
V-M-H failure surface
performance evaluation
safety factor
