35 m折线先张梁力学性能试验研究Ⅱ:承载能力极限状态  

Research on Mechanical Properties of 35 m Curve Strand Pretensioned BeamⅡ:Ultimate Limit State of Bearing Capacity

作　　者：包杰 李晓斌[2] 严猛 何苗苗 BAO Jie;LI Xiao-bin;YAN Meng;HE Miao-miao(Sichuan Provincial Transportation Engineering Quality Supervision Station,Chengdu,610047,China;Southwest Jiaotong University School of Civil Engineering,Chengdu 610031,China;Sichuan Jiaotong University Engineering Testing and Consulting Co.Ltd.,Chengdu 610031,China)

机构地区：[1]四川省交通工程质量监督站,成都市610047 [2]西南交通大学土木工程学院,成都市610031 [3]四川交大工程检测咨询有限公司,成都市610031

出　　处：《公路》2024年第11期138-143,共6页Highway

基　　金：四川省科技服务业示范项目,项目编号2021GFWO20。

摘　　要：为了研究折线先张梁在承载能力极限状态下的力学性能,对梁体开展开裂和破坏试验,根据试验结果对梁体的抗裂性能、极限承载力、延性进行评价。结果表明,开裂工况下,梁体裂缝附近区域呈现出一定的非线性特征,其余区域仍处于弹性受力状态;梁体抗裂储备系数为1.43,抗裂性能较好;梁体的安全储备系数达到4,安全储备较高;梁体的位移延性系数达到4.67,非线性变形能力较强。综合来看,梁体在承载能力极限状态下的力学性能良好,满足设计的安全性要求。In order to study the mechanical properties of the curve strand pretensioned beam under ultimate limit state,cracking and failure tests of the beam are carried out.According to the test results,the crack resistance,ultimate bearing capacity and ductility of the beam are evaluated.The results show that the area near the crack of the beam presents a nonlinear characteristic under the cracking condition,and the rest of the area is still in the elastic state.The crack reserve coefficient of the beam is 1.43,with a good crack resistance.The safety reserve coefficient of the beam is 4,with a high safety reserve.The displacement ductility coefficient of the beam is 4.67,with a strong nonlinear deformation ability.There are good mechanical properties of the beam under ultimate limit state,meeting the safety requirements of the design.

关 键 词：桥梁工程 折线先张梁 四点弯曲试验 承载能力极限状态 抗裂性能 极限承载力 梁体延性 

分 类 号：U441.2[建筑科学—桥梁与隧道工程]