钢-预应力混凝土组合梁滑移规律分析及连接件局部加强设计  

SLIP LAW ANALYSIS AND CONNECTORS' LOGICAL STRENGTHENING DESIGN OF PRESTRESSED STEEL-CONCRETE COMPOSITE BEAMS

作　　者：李运生[1] 张彦玲[1] 樊健生[2] 

机构地区：[1]石家庄铁道大学土木学院,石家庄050043 [2]清华大学土木工程系,北京100084

出　　处：《工程力学》2011年第1期192-198,共7页Engineering Mechanics

基　　金：国家自然科学基金项目(50408001);河北省自然基金项目(E2009000893);河北省教育厅基金项目(927017)

摘　　要：为了对预加力阶段组合梁剪力连接件的局部加强设计提供理论依据,采用能量变分法,考虑翼板剪力滞效应和钢梁与混凝土板之间相对滑移的影响,推导了钢-混凝土预应力组合梁在预加轴力作用下荷载效应的解析解,计算结果与试验结果吻合较好,并在解析解基础上分析了预加轴力作用下组合梁结合面的相对滑移规律。分析表明:组合梁在预应力锚固区的界面滑移及由此产生的纵向剪力远远大于跨中,纵向剪力出现集中分布现象,当张拉控制应力较大时会成为连接件设计的控制条件,可按照该文给出的结合面纵向剪力的计算方法进行连接件的局部加强设计。In order to provide a reference for connectors＇ local strengthening design of prestressed steel-concrete composite beams,the analytical solutions of load effects under prestressing axial load were deduced by energy-variation principle,in which the influence of shear lag and slip between the steel girder and concrete slab were considered.The numerical results agreed well with the test results.Based on the analytical results,the mechanism of slip between the steel girder and concrete slab was developed.It was shown that the slip deformation and the longitudinal shear force at the anchorage zone were much larger than those at the middle span,which may control the design of the shear connectors if the stretching control stress was too large.The calculation method of longitudinal shear force suggested in this paper can be used in connectors＇ local strengthening design of prestressed steel-concrete composite beams.

关 键 词：钢-混凝土组合梁 滑移规律分析 能量变分原理 预应力 剪力滞 

分 类 号：U448.21[建筑科学—桥梁与隧道工程]