摘要
对4根矩形截面高强钢筋混凝土梁进行静力抗弯试验,并结合现行规范分析了构件的受力特征、正截面承载能力、裂缝和挠度。结果表明,400 MPa细晶粒高强钢筋混凝土梁的受力特征与普通钢筋混凝土梁相同,混凝土平均应变沿截面保持平面;构件实测受弯承载力和裂缝平均间距与规范计算值符合较好,仍可按现行规范进行计算;最大裂缝宽度不适宜按现行规范进行计算;构件挠度按现行规范计算的理论值较试验实测值稍小,建议将规范的刚度计算公式乘以0.85的折减系数进行调整;在正常使用状态下构件裂缝宽度、挠度均满足现行规范要求。
In order to investigate the flexural behavior of concrete beam reinforced with 400 MPa fine grain high steel bars,the static bending tests on four rectangle cross-section concrete beams were made.Mechanical characteristics,flexural capacity of normal section,crack and deflection were analyzed according to present code.The results show that the flexural behavior of concrete beam reinforced with 400 MPa fine grain high steel bars is similar to normal concrete beam,the average concrete strain of different height keeps plane;flexural capacity and crack spacing could still be calculated by the current code for their values are close to the tested values.The current code was not suit able for calculating crack width;deflection value calculated by current code was a little smaller than the test value,so the stiffness-calculating formula was proposed to multiply 0.85 for adjustment;under the state of serviceability,crack width and deflection meet the requirements of the current code.
出处
《工业建筑》
CSCD
北大核心
2011年第6期71-74,共4页
Industrial Construction
基金
国家863高技术研究发展计划资助项目(2007AA03Z550)
