在海港和水工钢筋混凝土构件中,常常由于钢筋防腐蚀的需要,加大了混凝土的保护层厚度。保护层加大,混凝土塑性影响系数γ值可能减小,混凝土表面的裂缝间距和裂缝宽度均会加大。过去国内缺少这方面的试验资料,现行规范计算公式中也没有考虑这一重要因素。为了积累资料,我们受有关部门的委托进行了这方面的试验,现将初步分析介绍于下,以供讨论。 In seaport and hydraulic steel reinforced concrete members, the thickness of protective layer of concrete is often increased due to the need of anti-corrosion reinforcement. As the protective layer increases, the plastic effect coefficient γ of the concrete may decrease, and the crack spacing and crack width on the concrete surface will increase. In the past, there was a lack of test data in this respect in China, and this important factor was not taken into consideration in the existing formula for calculating norms. In order to accumulate data, we have been commissioned by the relevant departments conducted experiments in this area, the preliminary analysis is now introduced below, for discussion.