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在修复混凝土结构中,必须考虑由于在新浇面层与现有基层之间的不均匀收缩.开展研究了一种新的模型以确定新浇面层梁的应变、正应力及剪应力.这种模型是以交接面上的滑移及剪应力之间的线性关系为基础的,并涉及到整体滑移、局部粘结及整体粘结.对2根6m及8m(19.7英尺和26.2英尺)长的新浇面层混凝土梁的测量结果表明,在梁的两端存在应变集中,这与模型预测的结果相一致.用该模型测得的应变计算出的正应力和剪应力低于混凝土的有效强度.在新浇面层、基层及交接面处没发现裂缝.
In the restoration of concrete structures, a new model has to be developed to account for the strain, normal stress and shear stress of the new sprue when considering the non-uniform shrinkage between the new spar and the existing foundation. The models are based on the linear relationship between slip and shear stress on the interface and relate to overall slippage, partial bonding, and integral bonding. Two 6m and 8m (19.7 and 26.2 ft) The measurements of long, fresh-poured concrete beams show that there is strain concentration at both ends of the beam, consistent with the results predicted by the model. The normalized and shear stresses calculated using this model are lower than those for concrete Effective strength in the new surface layer, the grassroots and the junction found no cracks.