【摘要】 为研究HRB635级钢筋混凝土梁的受弯性能，共进行24根配置HRB635级钢筋和4根配置HRB400级钢筋的混凝土梁静力受弯试验，研究635MPa钢筋混凝土梁的破坏特征与最大裂缝宽度影响因素。试验结果表明：635MPa钢筋混凝土梁的破坏特征与普通钢筋混凝土梁相仿；提高混凝土强度会使最大裂缝宽度减小，增大钢筋直径和保护层厚度会使最大裂缝宽度增大；短期荷载作用下最大裂缝宽度实测值小于现行规范计算值，根据试验结果对短期裂缝宽度扩大系数、混凝土自身伸长对裂缝影响系数加以修正，根据修正结果提出具有95%保证率的综合调整系数，经相关公开试验数据校核后得出修正后计算值更加符合实际。更多还原

【Abstract】 In order to study the flexural behavior of HRB635 reinforced concrete beams, a total of 24 concrete beams with HRB635 grade steel bars and 4 concrete beams with HRB400 grade steel bars are tested under static bending. The failure characteristics of 635MPa reinforced concrete beams and the influencing factors of maximum crack width are studied. The test results show that the failure characteristics of 635MPa reinforced concrete beams are similar to those of ordinary reinforced concrete beams. Increasing the strength of concrete will reduce the maximum crack width, and increasing the diameter of steel bar and the thickness of protective layer will increase the maximum crack width. The measured value of the maximum crack width under short-term load is less than the calculated value of the current code. According to the test results, the short-term crack width expansion coefficient and the influence coefficient of concrete elongation on the crack are corrected. According to the correction results, a comprehensive adjustment coefficient with 95 % guarantee rate is proposed. After checking the relevant public test data, it is concluded that the corrected calculated value is more in line with the actual situation.更多还原