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农村在役钢筋混凝土空心板桥因耐久性能不足而造成承载能力下降的问题日益严重,常规的在役桥梁承载能力评估法——“定值分析法”没有考虑影响因素指标的随机性和评估等级划分的模糊性,本文结合随机性和模糊综合评定理论,提出了一种空心板桥上部结构承载能力评估方法。将影响承载能力评定的因素指标作为随机变量考虑,应用随机模拟和模糊综合评定的方法,得到承载能力分项系数和承载能力的概率分布,进而得到具有一定保证率的承载能力。通过某空心板桥的实测数据验证了方法的合理性,结果为农村在役钢筋混凝土空心板桥的承载能力评定和维修加固提供参考。
The problem of the decrease of carrying capacity caused by insufficient durability of reinforced concrete hollow slab bridge in rural areas is becoming more and more serious. The conventional evaluation method of bearing capacity of existing bridges - “Value Analysis Method” does not consider the randomness of the index of influencing factors and In order to evaluate the fuzziness of classification, this paper presents a method to evaluate the bearing capacity of the superstructure of hollow slab bridge by combining the stochastic and fuzzy comprehensive evaluation theory. Considering the factors affecting the carrying capacity assessment as a random variable, the stochastic simulation and fuzzy comprehensive assessment method are used to obtain the probability distribution of the bearing capacity sub-coefficient and carrying capacity, and then the bearing capacity with a certain guaranteed rate is obtained. The feasibility of the method is verified by the measured data of a hollow slab bridge. The results provide a reference for the assessment of the carrying capacity and maintenance and reinforcement of the existing reinforced concrete hollow slab bridge in rural areas.