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利用组合截面平截面应变假定， 对初始荷载为轴向压力的围套加固钢筋混凝土构件的截面应变进行了推导， 分析了极限状态时组合截面的相对界限受压区高度及混凝土与钢筋的应力大小，并提出实用计算公式。
Using the assumption of the flat section strain of the composite section, the section strain of the reinforced concrete member with reinforced concrete is determined by the axial stress of the initial load. The relative limit of the combined section and the stress of the concrete and the steel are analyzed. And put forward a practical calculation formula.