配置HRB500级非预应力筋的无粘结部分预应力梁应力增量试验  

Experiment of Stress Increment of Unbonded Partially Prestressed Concrete Beam with HRB500 Nonprestressed Tendons

作　　者：王荣霞[1] 郭蓉[1] 赵少伟[1] 黄海新[1] 于之静 

机构地区：[1]河北工业大学土木工程学院,天津300401 [2]廊坊市博科工程项目管理有限公司,河北廊坊065000

出　　处：《公路交通科技》2013年第6期56-59,74,共5页Journal of Highway and Transportation Research and Development

基　　金：河北省自然科学基金项目(E2011102054);河北省科技研究与发展计划项目(10215146);河北省建设科技计划项目(2012-2025)

摘　　要：对5片配置不同强度等级非预应力筋的无粘结部分预应力混凝土试验梁进行了加载试验,研究了该结构正常使用阶段和承载能力极限状态下,非预应力筋的强度等级以及高强非预应力筋配筋率对预应力筋应力增量的影响,并根据各国规范对试验梁极限应力增量的计算值与实测值进行了对比分析。研究结果表明:非预应力筋的强度等级差别及配筋率在弹性工作阶段对预应力筋的应力增量影响很小,但在混凝土开裂后至破坏阶段影响显著。各国规范极限应力增量计算值和实测值相比,我国现行规范计算结果更为安全合理。The loading test of 5 unbonded partially pre-stressed concrete beams with ordinary rebars of different strength grades is performed. The influence of strength grade of ordinary rebars and reinforcement ratio of ordinary rebar with excellent strength on stress increment of pre-stressed tendons in serviceability stage and ultimate state is studied. The test and calculation results of ultimate stress increment are compared and analyzed based on different foreign specifications. The result shows that （ 1 ） the strength grade difference and reinforcement ratio of ordinary rebar has little influence on the stress increment of pre-stressed tendons in elastic stage, but has much influence in the stage of concrete cracking to destroy; （2） comparing the test result and calculation results of ultimate stress increment based on different foreign specifications, the calculation result based on Chinese specification is more reliable.

关 键 词：桥梁工程 无粘结部分预应力混凝土梁 应力增量 荷载试验 HRB500级钢筋 

分 类 号：U441.2[建筑科学—桥梁与隧道工程]