楼盖梁计算翼缘宽度对现浇预应力框架梁抗裂验算的影响  

Influence of Flange Width of Prestressed Concrete Beam on Requirement for Cracking Capacity

作　　者：邬喆华[1] 楼文娟[2] 何丽波 许国平 刘占海 

机构地区：[1]同济大学土木工程学院,上海200092 [2]浙江大学建筑工程学院,杭州200092 [3]宁波市建筑设计研究院,315010 [4]上海建通工程建设咨询监理有限公司,200030

出　　处：《建筑结构》2005年第4期35-37,共3页Building Structure

摘　　要：根据结构力学原理,选用不同的计算翼缘宽度,研究了楼层、梁柱线刚度比、恒活载比、预应力筋反弯点位置、梁跨度、梁跨高比、翼缘厚度等各种因素对构件抗裂验算的影响,分析了单跨框架梁计算翼缘宽度的取值对预应力筋配置量、框架梁裂缝控制截面位置的影响。分析表明,框架梁计算翼缘宽度会对框架梁预应力筋配置量有一定的影响,要根据框架梁所在的楼层做相应的调整,调整幅度一般小于1 0 %。框架梁计算翼缘宽度会对底层框架梁控制截面有所改变,但不改变顶层和中间各层框架梁控制截面的位置。Flange width of prestressed concrete beam directly affects geometric dimension decision and mechanics characteristic of structure.Applying the principle of structural mechanics,the formulas for estimating internal force of the frame are provided.Some factors affecting cracking capacity, such as floor,span,the ratio of height to span of beam,the ratio of dead loads to live loads,the site of prestressed steel recurve point and the ratio of column to beam, are discussed.It is suggested that the quantity of prestressed steel should be added less than 10 percent.Controlling section of beam will be only changed in the first floor.Quasi-permanent combinations is the most unfavourable load combination.The simple method for designing is put forward to satisfy requirement of cracking capacity.

关 键 词：翼缘宽度 抗裂验算 预应力框架梁 计算 现浇 盖梁 预应力筋 控制截面 力学原理 刚度比 跨高比 梁裂缝 分析表 楼层 配置 调整 梁柱 单跨 底层 顶层 

分 类 号：TU225[建筑科学—建筑设计及理论] TU37