摘要
为探究剪力连接程度对预应力钢-混凝土连续组合梁的荷载-跨中挠度特征、沿梁纵向的相对滑移分布规律、沿截面高度的应变分布、预应力增量变化以及连续梁的内力重分布过程、破坏机理与极限强度等的影响,进行了4根预应力钢-混凝土连续组合梁的静载全过程试验研究。研究结果表明,随着剪力连接程度的降低,变形及界面滑移明显增大,承载能力有所降低,但降低程度小于剪力连接的降低程度,2根剪力连接程度系数为0.7的组合梁承载力比完全剪力连接组合梁均降低不到10%,随着剪力连接程度的降低连续梁相应弯矩的调幅值也会降低。
The static load of four prestressed steel concrete continuous composite beams was tested in order to research the effects of the degree of shear connection on the bending behaviors of prestressed steel concrete continuous composite beams,such as the load-deflection characteristic,the load-slip along the span of beams,the strain distribution along the height of composite section,the load-stress increment of prestressed tendons,the interal force redistribution,the failure mode and the ultimate strength of the structure.The research results show that the deformation and interface slip increase and the bending capacity decreases with the reduction of shear connection,but it is less than the direct proportion of the reduction of shear connection.The bending capacity of two composite beams with the shear connection coefficient of 0.7 was less than 10 percent compared with the full shear connection.The bending moment modulation value of continuous composite beams also decreases with the reduction of shear connection.
出处
《建筑结构》
CSCD
北大核心
2013年第6期64-67,33,共5页
Building Structure
基金
中央级公益性科研院所基本科研业务费重大项目(Y410006)
关键词
部分剪力连接
预应力
连续组合梁
抗弯性能
试验研究
partial shear connection
prestressed
continuous composite beam
bending behavior
experimental study
