摘要
通过配置600 MPa钢筋的无黏结部分预应力混凝土梁受弯试验,分析了无黏结预应力筋应力增量的发展规律及其影响因素,提出了配置600 MPa钢筋的部分预应力混凝土梁的无黏结预应力筋极限应力增量计算式。试验结果表明:中前期普通钢筋主要承受拉应力,预应力筋应力增量发展较为缓慢;当普通钢筋屈服后,预应力筋应力增量显著提高,从而保证600 MPa钢筋强度得以充分发挥。采用文中算式验算了69根试验梁的无黏结预应力筋极限应力增量,计算值与实测值较为接近,分析结果表明该算式计算准确性较好,适用范围合理。
Based on flexural experiment of the partially prestressed concrete beams with 600MPa steel bars,the development laws and influencing factors of stress increment of unbonded prestressed tendons were analyzed.The formula for calculating the ultimate stress increment of the unbonded prestressed tendons,adopted to partially prestressed concrete beams with 600 MPa steel bars was proposed.The results indicated that there was only a slight growth of stress increment of unbonded prestressed tendons in earlier stage,while the non-prestressed steel bars bore the majority of tensile stress.The growth of stress increment of tendons accelerated obviously after steel bars yielding,resulting in full use of strength of 600 MPa steel bars.Through checking and calculating the ultimate stress increment for 69 beams,the results showed that the proposed formula had the reasonable applied scope and high accuracy.
作者
李强
马卫华
康洪震
朱志东
LI Qiang;MA Weihua;KANG Hongzhen;ZHU Zhidong(Collge of Civil Engineering,Tangshan University,Tangshan 063000,China;Hebei Key Laboratory of Building Engineering and Tailings Utilization,Tangshan 063000,China;Tangshan Jianyuan Construction Engineering Material Testing Co.,Ltd.,Tangshan 063000,China)
出处
《工业建筑》
CSCD
北大核心
2022年第1期79-82,73,共5页
Industrial Construction
基金
河北省高等学校科学技术研究项目(QN2021319,BJ2020204)
唐山市科技计划项目(21130206C)
唐山市重点研发计划(19150233E)。
关键词
部分预应力混凝土梁
600
MPa钢筋
无黏结预应力筋
应力增量
综合配筋指标
partially prestressed concrete beam
600 MPa steel bar
unbonded prestressed tendons
stress increment
composite reinforcement index
