预应力混凝土连续梁板中跨数影响系数取值  

Selection of Spans Effect Coefficient in Prestressed Continuous Concrete Beams and Slabs

作　　者：郑文忠[1] 王晓东[1] 

机构地区：[1]哈尔滨工业大学土木工程学院,哈尔滨150090

出　　处：《武汉理工大学学报》2009年第15期49-51,57,共4页Journal of Wuhan University of Technology

基　　金：国家自然科学基金(50178026);教育部新世纪优秀人才支持计划项目(教科司[2005]290号)

摘　　要：无粘结筋极限应力增量的合理取值是无粘结预应力混凝土连续梁板抗力计算的基础。当仅一跨发生破坏时,连续梁板中无粘结筋的应力增量相对于各跨均同时破坏时要小。针对这一问题,提出连续梁板中无粘结筋极限应力增量应为各跨同时破坏时无粘结筋应力增量计算值与跨数影响系数的乘积。探索了关键参数对跨数影响系数的影响,提出了跨数影响系数的计算思路与取值建议。Reasonable selection of stress increment in unbounded tendons is basis of calculating the resistance in unbounded prestressed continuous beams and slabs. The stress increment in unbounded tendons is smaller when only one span of continuous beams and slabs was damaged than that all the spans were damaged at the same time. Ultimate stress increment in unbounded tendons is proposed to be multiplied stress increment in unbounded tendons when all the spans were damaged at the same time by spans affect coefficient. The influence of key parameters to the spans effect coefficient was explored, and thoughts of spans effect coefficient calculating and determining suggestion were proposed.

关 键 词：预应力混凝土 梁 板 无粘结筋 跨数影响系数 

分 类 号：TU378.1[建筑科学—结构工程]