波形钢腹板预应力混凝土组合箱梁试验  

Experimental research on pre-stressed concrete composite box girders with corrugated steel webs

作　　者：狄谨[1] 周绪红[1,2,3] 孔祥福[1,4] 程德林[1] 张茜[1] 

机构地区：[1]长安大学公路学院,陕西西安710064 [2]兰州大学土木工程与力学学院,甘肃兰州730000 [3]湖南大学土木工程学院,湖南长沙410082 [4]山东省交通规划设计院,山东济南250031

出　　处：《长安大学学报（自然科学版）》2009年第5期64-70,共7页Journal of Chang’an University(Natural Science Edition)

基　　金：国家西部交通建设科技项目(200431822315)

摘　　要：介绍了波形钢腹板预应力混凝土组合箱梁的发展与应用概况,为研究该类结构的受力性能,根据依托工程设计制作了缩尺比例为1∶4的模型试验梁,按分级加载的方式进行了静力荷载试验,对波形钢腹板预应力混凝土组合箱梁的弯曲、剪切及扭转性能进行了试验研究,得到了各级荷载作用下的箱梁挠度,混凝土顶底板、波形钢腹板、横隔板的应变,支座反力以及开裂荷载与破坏荷载。试验结果表明:波形钢腹板预应力混凝土组合箱梁的受力性能与普通预应力混凝土箱梁相比有其自身的特点;在试验荷载作用下,其弯矩由混凝土顶底板承担,绝大部分剪力由波形钢腹板承担;在4点对称荷载作用下,箱梁跨中截面顶板存在负剪力滞现象;在弹性范围内,混凝土顶底板纵向应变呈线性变化,符合梁理论的平截面假定;箱梁受弯过程可分为3个阶段,弹性工作阶段、带裂缝工作阶段和屈服破坏阶段;布置中横隔板能有效地提高箱梁的抗扭刚度。The development and application of pre-stressed concrete composite box girders with corrugated steel webs were presented. A model （1 ： 4） of the pre-stressed concrete composite box girder with corrugated steel webs was made in order to research the mechanics properties of the composite box girders. Through the static loading test, the experimental research on bending, shear and torsion of the pre-stressed concrete composite box girder with corrugated steel webs was performed. The deformation of the box girder, the strain of top and bottom concrete slabs, the corrugated steel webs and the diaphragms, reactive force, crack load and failure load were obtained under the multi-stage loading. The results show that compared with the common prestressed concrete box girders, the pre-stressed concrete composite box girders with corrugated steel webs have particular mechanical properties. Under loading, bending moment is only borne by top and bottom concrete slabs, and most shear force is borne by the corrugated steel webs. Negative shear lag occurs on the top concrete slabs of mid-span under symmetric loadings. Within elastic range, longitudinal strains on top and bottom concrete slabs distribute linearly which accord with dummy horizontal section assumption. The bending course of box girder has three stacord with dummy horizontal section assumption. The bending course of box girder has three stages, which include of elastic stage, crack stage and failure behavior stage. Torsional stiffness of box girder was availably improved by diaphragms. 20 figs, 11 refs.

关 键 词：桥梁工程 波形钢腹板 箱梁 极限承载力 试验 

分 类 号：U448.38[建筑科学—桥梁与隧道工程]