波形钢腹板组合箱梁抗扭性能的试验及理论研究  

Experimental and Theoretical Research on Torsional Performance of Composite Box Girders with Corrugated Steel Webs

作　　者：张彦玲 刘宇坤[1,2] 李运生 Zhang Yanling;Liu Yukun;Li Yunsheng(School of Civil Engineering,Shijiazhuang Tiedao University,Shijiazhuang 050043,China;Key Laboratory of Roads and Railway Engineering Safety Control of Ministry of Education,Shijiazhuang Tiedao University,Shijiazhuang 050043,China)

机构地区：[1]石家庄铁道大学土木工程学院,河北石家庄050043 [2]石家庄铁道大学道路与铁道工程安全保障省部共建教育部重点实验室,河北石家庄050043

出　　处：《石家庄铁道大学学报（自然科学版）》2021年第2期1-9,共9页Journal of Shijiazhuang Tiedao University(Natural Science Edition)

基　　金：国家自然科学基金(51778377,51508348);河北省自然科学基金(E2018210149)。

摘　　要：为了研究波形钢腹板组合箱梁的扭转性能,分别对2根单箱单室截面和单箱双室截面波形钢腹板预应力混凝土组合箱梁在纯扭作用下的受力性能进行了全过程加载试验研究,测试了试验梁的扭转角、截面应变和裂缝随荷载发展的规律,获得了波形钢腹板组合梁纯扭破坏现象,并根据试验结果给出了开裂扭矩和极限扭矩的计算方法。结果表明,波形钢腹板组合箱梁在纯扭作用下,混凝土顶、底板斜裂缝与梁轴线呈40°~45°的夹角;混凝土开裂前扭率与扭矩呈线性增长关系,开裂以后试验梁扭转刚度降低,扭率与扭矩呈非线性增长;开裂扭矩和极限扭矩均可以表示为闭口截面与混凝土板式截面所承担的扭矩的叠加。In order to study the torsional behavior of the prestressed composite box girder with corrugated steel webs,torsional experiments were conducted on two test girders with a single-box single-cell section for one and a single-box double-cell section for the other.The torsion angle,sectional strain and cracks of the concrete slab were measured under the pure torsional load,and the pure torsional failure modes were obtained.Based on the experimental data,the calculation methods for the cracking and ultimate torsional moment were suggested.The results show that under the pure torsion,the angle between the diagonal cracks and the beam axis is approximately 40°~45°on the concrete slabs;the torque rate increases with the torque linearly before the cracking of the concrete but non-linearly after cracking due to the decrease of the torsional stiffness.The cracking and ultimate torsional moments all can be dealt with the superimposition of the torsional moments resisted by the closed box section and the concrete slabs.

关 键 词：组合箱梁 波形钢腹板 纯扭性能 开裂扭矩 极限扭矩 

分 类 号：U448.216[建筑科学—桥梁与隧道工程]