冷却塔损伤评价与加固设计方法

以青海省察尔汗盐湖地区某冷却塔为例,研究塔体在酸性气体侵蚀和冬季冷热交替共同作用下的损伤状况,对冷却塔混凝土脱落、裂缝分布与开展、混凝土强度等进行现场检测．应用ABAQUS软件计算了塔体内力,以塔体内力与抗力比值为参数对塔体安全性进行分析．给出塔体外侧后置钢筋混凝土面层、内侧后置砂浆面层并在砂浆面层表面涂抗渗材料的加固方案．论述了加固后承载力验算时所采用的截面材料等效弹性模量与等效强度的计算方法,为同类工程损伤评价与加固设计提供参考．

Damage evaluation and strengthening design of a cooling tower

There is a cooling tower located in the Golmud Salt Lake area, and due to the erosion of the acid gas and the alternate heating and cooling climate in the winter, it is seriously damaged. In order to grasp the damage situation of the cooling tower, the on-site test of the tower on the falling-off of the concrete, the distribution and propagation of the cracks and the concrete strength has been performed. Based on the test result, the internal force of the tower has been calculated with the application of the ABAQUS software, and the safety of the tower has been analyzed with the ratio of the ratio of the tower internal force and the resistance. According to the analytical result, the strengthening scheme has been proposed, namely, adding concrete layer to the outside surface and mortar layer to the inside surface of the tower, and coating the mortar layer with impervious material. Moreover, the calculation methods of the equivalent elastic modulus and the equivalent strength in verifying the bearing capacity after strengthening have been introduced in the paper, which provides reference to the damage evaluation and strengthening design for engineering projects of the same kind.