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以往在分析刚构桥0块强度形成过程时,没有考虑到钢模板对混凝土提供的强大三向位移约束,因此,计算得到的应力偏小。以实际工程为依托,借助ABAQUS软件建立了有限元模型,分析箱梁0号块从混凝土浇筑到混凝土形成强度的整个过程中梁体的应力-强度关系,总结出0号块空间应力分布及时程变化规律,为裂纹的出现提供理论依据,并将实际桥梁中出现的0号块裂缝病害与分析结论做对比,发现研究结果与实际情况吻合较好,能够证明箱梁0号块开裂病害是箱梁养护过程中,在多种影响因素共同作用下形成的。
In the past, when analyzing the strength formation of Rigid Frame Bridge 0, the strong three-dimensional displacement constraint provided by the steel template to the concrete was not taken into consideration. Therefore, the calculated stress was small. Based on the actual project, the finite element model was established with ABAQUS software to analyze the stress-strength relationship of beam body from the concrete pouring to the concrete forming strength of No. 0 block, and to sum up the spatial stress distribution and time-scale of No. 0 block And provide the theoretical basis for the appearance of cracks. Compared with the analysis results, the crack No. 0 in the actual bridge is found to be in good agreement with the actual situation, and it can be proved that the crack of No. 0 block of box girder is a box Beam curing process, formed under the influence of a variety of factors.