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本文试图对采用结构加固新技术“高强不锈钢绞线网-渗透性聚合物砂浆”加固梁的正截面承载力的计算方法进行研究。本文对加固梁截面受弯极限状态的应变与应力关系进行了推导,并依据钢筋混凝土极限状态设计理论得到了梁正截面承载力的简化计算公式。通过未加固的混凝土梁和I类、II类、III类加固梁试验结果与计算结果的对比发现:对高强不锈钢绞线网-渗透性聚合物砂浆加固梁体,考虑加固体与原梁体应变与应力滞后的影响,对加固体内钢筋应力进行修正,再按极限状态设计理论计算加固梁的正截面承载力是安全可靠的。
This paper attempts to study the calculation method of the normal cross-section bearing capacity of a new type of structural reinforcement technology “high-strength stainless steel wire mesh-permeable polymer mortar”. In this paper, the relationship between the strain and stress of the reinforced beam section under the ultimate bending state is deduced. According to the design theory of reinforced concrete limit state, a simplified calculation formula of the bearing capacity of the normal beam section is obtained. The comparison between the experimental results and the calculated results of unconfined concrete beams and reinforced concrete beams of type I, II and III shows that for high strength stainless steel wire net-permeable polymer mortar reinforced beam, With the influence of the stress lag, the stress of reinforcing steel body is corrected, and then the ultimate bearing capacity of the reinforcing beam is calculated according to the limit state design theory. It is safe and reliable.