论文部分内容阅读
根据某连续刚构桥主跨跨中附近底板纵向裂纹的特征,结合桥梁设计参数取值分析、全桥整体空间计算和跨中梁段局部应力分析以及其他桥梁裂纹的分析成果,认为跨中底板在自重和纵向预应力作用下,底板将出现横向拉应力,而波纹管偏离设计位置致使底板混凝土出现更大的局部拉应力,以及预应力钢束张拉时,混凝土强度可能尚未达到要求是导致跨中附近底板混凝土出现纵向裂纹的主要原因。
According to the characteristics of the longitudinal cracks of the floor near the middle span of a continuous rigid frame bridge and the analysis of the design parameters of the bridge, the overall space calculation of the whole bridge and the local stress analysis of the mid-span beam and the analysis of other bridge cracks, Under the influence of self-weight and longitudinal prestressing, the bottom plate will have transverse tensile stress, and the deviation of the corrugated pipe from the design position causes the concrete slab to have greater local tensile stress and the concrete strength may not meet the requirements when the prestressed steel beam is stretched The main reason for longitudinal cracks in the floor concrete near the mid-span.