An analysis model accounting for time-dependent shear lag effects in assembled composite bridge decks
An analysis model accounting for time-dependent shear lag effects in assembled composite bridge decks
复制标题
DOI：
10.1177/13694332221080601
复制
发表时间：
2022-04
影响因子：
2.6
通讯作者：
Dunwen Huang;Jun Wei;Hui Peng;Hengliang Guo;Bowen Wang
中科院分区：
文献类型：
--
作者：
Dunwen Huang;Jun Wei;Hui Peng;Hengliang Guo;Bowen Wang
装配式钢-混凝土组合桥梁的混凝土桥面由预制板和板间的施工缝组成。考虑梁段纵向接缝混凝土与预制板混凝土（新老混凝土）的龄期差异时，拼装板的时变特性不同于整个预制板的时变特性。基于虚功原理，建立了新老混凝土跨梁截面时变性对组合梁剪力滞效应影响的微分方程。算例分析表明，该模型比传统模型更准确，特别是在分析接缝混凝土的长期应力时，传统模型忽略了梁截面上混凝土的年龄差异。该模型得到的节点混凝土长期应力随时间的减小速度快于传统模型，增加了应力沿混凝土翼缘分布的不均匀性。总体而言，该模型能够合理预测组合桥面组合梁的长期性能，有利于组合桥梁的全寿命设计和使用行为分析。
The concrete deck of steel-concrete composite bridges made via prefabricated construction consists of precast slabs and construction joints between the slabs. When the age difference between the longitudinal joint concrete and precast slab concrete (new-old concrete) across a beam section is considered, the time-dependent characteristic of the assembled deck is different from that of the whole prefabricated deck. Based on the virtual work principle, differential equations were established to analyse the influence of the time-dependent characteristics of new-old concrete across a beam section on the shear lag effect of the composite beams. The analysis of examples showed that the proposed model was more accurate than the traditional model, which ignores the concrete age difference across a beam section, especially when analysing the long-term stress of joint concrete. The long-term stress of the joint concrete obtained by the proposed model decreased faster than that obtained by the traditional model with time, which increased the non-uniformity of the distribution of stress along the concrete flange. Overall, the proposed model could reasonably forecast the long-term performance of composite beams with assembled decks, which is beneficial to the life-cycle design and service behaviour analysis of composite bridges.