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针对某桥标准跨径为48.5 m的预制长T梁在施工拆模后出现一条环向裂缝的现象,分析了产生裂缝的主要原因可能是台座的不均匀沉降和混凝土的收缩影响造成的。为了确定台座的不均匀沉降产生的应力情况,利用有限元软件ANSYS建立有限元模型计算。通过计算得出台座在不均匀沉降时产生的应力值,再对比施工拆模时混凝土的抗拉强度,找出了开裂的主要原因。为后续T梁施工避免同类裂缝的出现提供了有力的保证。
For a bridge with a standard span of 48.5 m prefabricated long T-beam in the demolition of the mold after the emergence of a ring fracture phenomenon, analysis of the main reasons for the cracks may be caused by uneven settlement of the pedestal and shrinkage of concrete caused. In order to determine the stress caused by uneven settlement of the pedestal, finite element software ANSYS was used to establish the finite element model. By calculating the stress value of pedestal when it is unevenly subsided, the main reason of cracking is found out by comparing with the tensile strength of concrete during demolition. For the follow-up T beam construction to avoid the emergence of similar cracks provide a strong guarantee.