摘要
基于Gjelsvik位移模式与修正的翘曲位移函数,建立一个能同时考虑界面滑移和剪力滞效应的钢-UHPC组合梁模型,研究以矮肋板作为桥面体系的新型组合梁剪力滞效应。利用最小势能原理,得出简支组合梁在均布荷载和集中荷载下的解析解,并将解析解与试验值和ANSYS结果进行对比,验证解析解的适用性和准确性。比较矮肋板与矩形板桥面体系组合梁剪力滞效应的差异,发现相同荷载工况下,矮肋板有效宽度系数比矩形板减少了近17%,说明矮肋板桥面体系组合梁剪力滞效应更明显。对组合梁剪力滞效应影响因素进行分析,发现矮肋板桥面体系组合梁剪力滞效应除与宽跨比、荷载类型、荷载作用位置有关外,还与剪力连接件的剪切刚度、UHPC翼缘板参数取值等因素有关。研究结果还表明:适当减小宽跨比、剪力连接件的剪切刚度都可降低矮肋板桥面体系组合梁剪力滞效应。
Based on Gjelsvik displacement model and modified warping displacement function, this paper established an analytical model of steel-UHPC(ultra-high performance concrete) composite beam accounting for the slip between UHPC slab and steel beam together with the shear lag effect in the UHPC slab. The focus of the paper was pinned on the shear lag effect of the proposed innovative composite beam composed of the short-ribbed slab in the bridge deck system. On the basis of the principle of minimum potential energy, the closed-form solutions were obtained for a simply-supported steel-UHPC composite beam under uniform loads and concentrated loads. The analytical model was then validated by the numerical and experimental results. Compared with the shear lag effect of the composite steel-UHPC beam with a UHPC rectangular slab, it was found that the effective width factor of the counterpart with a short-ribbed slab decreases by 17% under the same load condition. In other words, the shear lag effect of the proposed UHPC composite beam appeared more apparently than that of the latter. The parameter analysis in the final part of the paper revealed that the shear lag effect of the steel-UHPC composite beam is significantly influenced by the following aspects: the flange width-span ratio, the load type and its corresponding position as well;and the shear stiffness of studs together with the geometric parameters ofthe UHPC slab. The results also showed that proper reduction of the width-span ratio or the shear stiffness of studs can moderately mitigate the shear lag effect of the short-ribbed slab bridge deck system.
作者
朱平
杜铁
赵华
邵旭东
ZHU Ping;DU Tie;ZHAO Hua;SHAO Xudong(Key Laboratory for Wind and Bridge Engineering of Hunan Province,Hunan University,Changsha 410082,China;Anhui Transport Consulting&Design Institute Co.,Ltd,Hefei 230088,China)
出处
《铁道科学与工程学报》
CAS
CSCD
北大核心
2019年第12期3013-3023,共11页
Journal of Railway Science and Engineering
基金
国家自然科学基金资助项目(51778223)
中国博士后科学基金资助项目(2016M602411)
湖南省科技重大专项资助项目(2017SK1010)
关键词
钢-UHPC组合梁
剪力滞效应
最小势能原理
矮肋板
有效分布宽度
steel-UHPC composite beam
shear lag effect
principle of minimum potential energy
short-ribbed slab
effective distribution width
