钢腹板弯折剪切连梁受力性能试验研究  

Experimental study on mechanical performance of shear links with bent steel web panels

作　　者：庄亮东 聂鑫[1] 黄达 聂建国[1] ZHUANG Liangdong;NIE Xin;HUANG Da;NIE Jianguo(Department of Civil Engineering,Tsinghua University,Beijing 100084,China)

机构地区：[1]清华大学土木工程系,北京100084

出　　处：《建筑结构学报》2021年第3期175-184,共10页Journal of Building Structures

基　　金：国家自然科学基金项目(51722808)。

摘　　要：在偏心支撑钢-混凝土组合框架结构中,采用传统的剪切连梁虽然可以有效提升框架结构的抗侧刚度和耗能能力,但是其引起的附加弯矩会导致框架梁跨中混凝土严重开裂,不利于地震后的结构修复。为避免框架梁跨中混凝土板的开裂破坏,提出钢腹板弯折的剪切连梁,该连梁从框架梁侧面与梁腹板连接,可以有效地减少剪切连梁对框架梁引起的附加弯矩,从而防止其跨中混凝土板的开裂。试验中共设计制作5个钢腹板弯折的剪切连梁并进行了拟静力试验,分析了不同材料、弯折工艺以及加劲肋构造对剪切连梁受力性能的影响。结果表明:钢腹板弯折的剪切连梁具有稳定的耗能能力,采用低屈服点LY160钢材相比于传统的Q235钢材可使剪切连梁延性系数从2.66提高至3.77,弯折工艺对于剪切连梁受力性能的影响较小,加劲肋可有效约束剪切连梁腹板的面外变形,防止面外屈曲破坏的发生,并使得构件的极限荷载提高53.7%,极限塑性转角提高55.5%,耗散的能量增加190%。面外肋板约束构造不仅能起到与加劲肋一样的效果,还能进一步提升构件的延性和耗能效率。In eccentrically braced steel-concrete composite frame structure,adopting traditional shear links would efficiently enhance the lateral stiffness and energy dissipation capacity,whereas the additional moment caused by which would also significantly develop cracks in concrete of the mid span,making it hard for repair after earthquakes. To avoid concrete from cracking in the mid span,a kind of bent steel web panels was put forward. The panel is connected laterally to the web of beams,which would remarkably reduce the additional moment given to frame beams,and prevent the occurrence of concrete cracks. Five bent steel web panels were designed for quasi-static test. Panels with different kinds of test materials,bending methods and stiffener configuration were experimented. The results indicate that bent steel web panels are capable of energy dissipation,and the ductility factor of bent shear panel made of Q235 steel increases from 2. 66 to 3. 77 when LY160 steel is adopted. Bending method has less impact on mechanical performance towards shear panels. Stiffener would constrain the lateral deformation of web panels,prevent the out-ofplane buckling,and increase the peak strength,ultimate plastic rotation angle and dissipation energy by 53. 7%,55. 5% and 190%,respectively. Lateral brace could not only contribute beneficial effects to the shear link as the stiffener,but also further improve the ductility and energy dissipation efficiency of the link.

关 键 词：钢-混凝土组合框架 偏心支撑 剪切连梁 拟静力试验 受力性能 

分 类 号：TU398.9[建筑科学—结构工程] TU317.1