通过裂缝特征快速评估桥梁承载能力的试验研究

桥梁承载能力的评定有多种方法,但都很难对其进行快速评定.针对钢筋混凝土简支板梁桥弯曲受力裂缝的成因,从结构承载能力研究入手,以期达到快速评估.利用5片钢筋混凝土矩形小梁模型,在跨径三分点处同时分级施加集中荷载进行破坏性试验,得出了裂缝最大高度、平均高度、裂缝宽度与承载能力之间的关系,通过回归得出了经验公式.提出了采用裂缝特征方法对桥梁承载力进行快速检测评估.经与实测桥梁的荷载试验数据分析对比,证明该方法可靠且可行.

Quick Assessment of Loading Capacity of Bridge by Cracking Characteristics

According to the structural cause of flexural crack in a simply-supported reinforced concrete slab bridge,how to assess its loading capacity quickly was investigated experimentally.With 5 rectangular RC slab beams as specimens,the destructive tests were carried out the way the multi-stage concentrated load was exerted at both the tripartite points of the span simultaneously.Then,the relationship was obtained,in between the maximum and mean heights of cracks,crack width and loading capacity.An empirical formula is thus fitted by means of regression analysis,with a quick assessment of loading capacity of bridge proposed by cracking characteristics.Comparing the values measured with the assessed results,the feasibility and reliability of the proposed method are demonstrated.