后加预应力梁侧叠合大跨混凝土梁的抗裂性能研究  

Research on Crack Resistance of Post-prestressed Side Superimposed Long Span Concrete Beams

作　　者：张建永 Zhang Jianyong(Shanxi Vocational University of Engineering Science and Technology,Jinzhong,Shanxi 030602)

机构地区：[1]山西工程科技职业大学,山西晋中030602

出　　处：《江西建材》2024年第7期332-334,共3页

摘　　要：文中以某钢筋混凝土框架结构建筑项目为例,提出体外预应力和增大截面组合加固方案,并采用仿真和监测手段分析后加预应力梁侧叠合大跨混凝土梁的抗裂性能。结果表明,大跨混凝土梁顶混凝土跨中应力实测值为2.34 MPa,计算值为2.73 MPa;混凝土梁底混凝土跨中应力实测值为2.44 MPa,计算值为2.98 MPa;两者差异性较小,验证了所建仿真模型的准确性。加固前后混凝土梁的应力及挠度沿着跨长的分布形状从U型变为W型,且预应力加固后有效提升了大跨混凝土梁的承载性能及抗变形能力。In this paper,a reinforced concrete frame construction project is taken as an example,and the combination of external prestressing and increasing section is proposed.Simulation and monitoring methods are used to analyze the crack resistance of the superimposed long-span concrete beams.The results show that the measured value and the calculated value are 2.34 MPa and 2.73 MPa respectively.The measured stress in the middle span of concrete beam bottom is 2.44 MPa and the calculated stress is 2.98 MPa.The difference between the two is relatively small,which verifies the accuracy of the simulation model.The stress and deflection of concrete beams before and after reinforcement change from U shape to W shape along the span length.The bearing capacity and deformation resistance of long-span concrete beams are improved effectively after prestressed reinforcement.

关 键 词：混凝土梁 预应力 大跨度 监测方案 模型建立 抗裂性能 

分 类 号：TU74[建筑科学—建筑技术科学]