Abstract
In order to effectively evaluate the safety status of the cantilever construction of a large-span rigid frame bridge, this paper takes a four-span rigid frame bridge as the engineering background, selects the failure probability of the cantilever construction, the natural environment, the cantilever construction operation, and the management level as the evaluation factors and divides the possibility level into Five levels, an extension model is established to evaluate the cantilever construction of the bridge. This paper first uses fuzzy comprehensive evaluation to quantify the natural environment and cantilever construction technology, then calculates the failure probability of the bridge cantilever construction based on Monte Carlo theory, and finally scores according to the management level of the management system. Invite relevant experts to obtain the weight set of each evaluation factor through the 1-9 scale method, and use the goodness evaluation method in the matter-element extension method for evaluation. The results show that the safety assessment result of the cantilever construction of the bridge is a medium risk, which provides a reliable basis for predicting and avoiding risks. Based on the matter-element extension method, the rigid frame cantilever construction safety assessment takes into account the uncertainty and ambiguity of failure, and more objectively reflects the safety status of the cantilever construction during the construction period. The calculation results of different safety evaluation models are compared with the results of this paper, which verifies the feasibility and effectiveness of the matter-element extension theory applied to the safety evaluation of cantilever construction.
Highlights
In order to effectively evaluate the safety status of the cantilever construction of a large-span rigid frame bridge, this paper takes a four-span rigid frame bridge as the engineering background, selects the failure probability of the cantilever construction, the natural environment, the cantilever construction operation, and the management level as the evaluation factors and divides the possibility level into Five levels, an extension model is established to evaluate the cantilever construction of the bridge
[14] LIU Jun-juan,Wang Wei,Cheng Lin.Interval number fuzzy evaluation based on trapezoid subordinate function[J].Systems Engineering and Electronics,2009,31(2)
[16] Qiao Jiangang,Wang Wei,Li Shixuan.Relative difference function based traffic safety assessment of highway construction[J]
Summary
In order to effectively evaluate the safety status of the cantilever construction of a large-span rigid frame bridge, this paper takes a four-span rigid frame bridge as the engineering background, selects the failure probability of the cantilever construction, the natural environment, the cantilever construction operation, and the management level as the evaluation factors and divides the possibility level into Five levels, an extension model is established to evaluate the cantilever construction of the bridge. 摘要:为了有效评估大跨度刚构桥悬臂施工安全状况,本文以某四跨刚构桥为工程背景,选择悬臂施工失效概率、自然 环境、悬臂施工工艺、管理水平作为评价因子并将风险-划分为五个等级,建立可拓模型对该桥悬臂施工进行评估。本文 首先对自然环境与悬臂施工工艺采用模糊综合评价进行量化处理,然后根据蒙特卡罗理论计算出大桥悬臂施工失效概率, 最后则根据管理系统管理水平进行打分。邀请相关专家通过1~9标度法得到每个评价因子的权重集,采用物元可拓法中 的优度评价法进行评估。结果表明,该桥悬臂施工安全评估结果为中等风险,为预测和避免风险提供了可靠依据。基于 物元可拓法刚构悬臂施工安全评估考虑了失效的不确定性及模糊性,较为客观地反应施工期间悬臂施工的安全状态。将 不同安全评估模型计算的结果与本文结果对比,验证了物元可拓理论应用于悬臂施工安全评估的可行性与有效性。 悬臂施工法具有良好的经济性,因而成为跨越山谷、 河流或桥下净空受到限制时优先考虑的施工方法。但在桥 梁的施工期间,因自然环境、施工工艺不当或者管理不到 位等原因造成桥梁失效事故频发。针对结构可靠性的问题, 穆加宇提出了动态可靠度理论与“理想临界结构”相联系的 概念,将可靠性划分为不同等级并定量计算出结构的可靠 性[1]。刘杨、张建仁在引入特殊的修正联合概率密度函数 的基础上,将有限元法与退火进化算法相结合用以研究结 次分析法)把影响桥梁构件承载力不确定性的因素系统化, 利用模糊数学将定性描述定量化[3]。岐峰军对参数离散性 下刚构桥稳定性可靠度分析方面进行了研究,采用MC法产 生伪样本进行参数预测从可靠度出发准确评估刚构桥安全 性[4]。Davis-McDaniel 等人在结合了大量桥梁失效事故的 基础上,利用故障树建模分析桥梁安全风险[5]。 论与模糊数学往往用不同的表达方式,难以有效综合两者 进行评价。蔡文创立可拓工程学能够描述事物的可变性, 将定性描述转变为定量描述,并通过建立多指标的评估模 型来完整评价事物[6]。杨雅勋应用可拓模型对某连续梁桥 进行状态评估[7]。张海提出将可拓理论应用于对混凝土梁 桥可靠性进行综合评价[8]。张延年运用多指标多级可拓评 价方法评价桥梁下部结构的总体可靠性[9]。
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
