摘要
在考虑了影响旧桥承载力的不利因素的基础上 ,分析了对旧钢筋混凝土简支梁桥承载潜力有利的几种因素 ,包括未意识到的连续性、约束性、组合作用、荷载横向分布、混凝土强度和钢筋强度变异性等 .通过室内缩尺模型及实桥荷载试验的结果 ,给出了各潜力因素影响系数的初步定量表示 ,并把这些影响系数体现在荷载效应和抗力效应的表达式中 .在已有的旧桥评定方法基础上 ,提出了考虑旧桥承载潜力的修正公式 ,并结合工程实例说明了使用该修正公式进行旧桥评定的步骤 ,旨在为旧桥改造提供理论依据 .
After considering the unfavorable factors of influencing the bearing capacity of old bridges, the authors analyze several beneficial factors of the potential load bearing capacity of old reinforced concrete simple supported beam bridges, including the unaware continuity, restraint, composite action, lateral load distribution, variation of concrete strength and steel bar strength, etc. Through the results of laboratory scale model tests and practical bridge load tests, each factor’s influential coefficient is given quantitatively, and these factors' coefficients are embodied in the calculation expression of the load effect and structural resistance effect. Based on the existing method of bridges’ assessment, a revised formula of the potential load bearing capacity of old bridges is provided. Combined with an engineering case, the steps of using this revised formula are explained for assessing old bridges, which provides engineers with a theoretical basis to repair and transform old bridges.
出处
《东南大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2001年第3期94-98,共5页
Journal of Southeast University：Natural Science Edition
关键词
旧桥
钢筋混凝土
简支梁桥
承载潜力
old bridge
reinforced concrete
simple supported beam
potential load bearing capacity
