体内体外混合配束节段预制箱梁受弯性能试验  

Experimental on flexural behavior of segmental precast concrete beam with internal tendons and external tendons

作　　者：袁爱民[1] 吴闻秀 孙大松[3] 戴航[4] 

机构地区：[1]河海大学土木与交通学院,江苏南京210098 [2]金华市公路管理局,浙江金华321013 [3]江苏省交通规划设计院股份有限公司,江苏南京210005 [4]东南大学土木工程学院,江苏南京210096

出　　处：《长安大学学报（自然科学版）》2015年第5期73-81,103,共10页Journal of Chang’an University(Natural Science Edition)

基　　金：江苏省交通科学研究计划项目(08Y08);博士点基金项目(20100094120013);中央高校基科研业务费专项资金项目(2009B13914)

摘　　要：为了探索体内体外配束比对节段预制箱梁受弯性能的影响,考虑3种水平的体内体外混合配束比,制作3根节段预制拼装箱梁进行极限承载力试验,研究了体内体外不同配束比下,节段预制箱梁的变形特点、裂缝分布特征及破坏模式。研究结果表明：体内束布置越多,节段预制箱梁的承载力越高;梁体变形主要集中在节段接缝处;梁体的裂缝是沿胶接缝的素混凝土开裂,张开的接缝沿梁高方向分布符合平截面假定;极限承载力状态下,体外束的应力可达1 400-1 600 MPa,应力增量可达35%-45%;当梁体破坏时,普通钢筋的累积应变仍小于钢筋屈服应变,建议普通钢筋按照构造配筋配置。In order to investigate the effect of ratio of internal tendons and external tendons on performance of the SPCB, three different ratios of internal tendons and external tendons were considered to make three segmental precast concrete beams for the experiment of ultimate strength destructive tests. The deformation properties, cracks distribution characteristics and failure modes of the three concrete beams were studied. The results show that the more internal tendons are, the higher ultimate strength capacity will be. The deformation of SPCB is mainly focused on the segment joints and the cracks of SPCB are mainly epoxy opening between the joints. The opening width of the joints along vertical direction are in accord with the plane section assumption. The ultimate stress of external tendons can be up to 1 400 MPa-1 600 MPa and the stress increment is about 35%-45%, whose contribution to the ultimate bearing capacity should not be neglected. The load-strain curve of plain reinforcement of SPCB shows an obvious turning point at the moment of joint cracking. The strain grows faster after cracking, but is still less than the yield strain. Therefore, the minimum reinforcement ratio is recommended. 3 tabs, 16 figs, 16 refs.

关 键 词：桥梁工程 体内体外混合配束 节段预制箱梁 受弯性能 破坏模式 

分 类 号：U448.21[建筑科学—桥梁与隧道工程] TU378.2[交通运输工程—道路与铁道工程]