钢-UHPC轻型组合桥面板横向受力性能

发布时间：2018-04-08 20:26

本文选题：桥梁工程　切入点：钢-UHPC轻型组合桥面板　出处：《中国公路学报》2017年09期

【摘要】：为研究一种正交异性钢-超高性能混凝土(UHPC)轻型组合桥面结构,在局部车轮荷载作用下的横向受力性能与横向受力组成,进行了足尺模型静载试验和有限元数值模拟。静载试验对同一足尺模型分别进行了横向简支工况和横向悬臂工况的加载试验,通过边界条件的变化来模拟组合桥面板不同的受力状态,并将试验结果与有限元分析结果进行对比,验证有限元模型的正确性,而后利用有限元模型的分析结果,得到组合桥面板在局部车轮荷载下的横向受力组成。研究结果表明:组合桥面板在车轮荷载作用下,其横向受力局部效应明显,横向应力主要局限于荷载作用区域附近的两道U肋范围内;在车轮荷载影响区域内,由横肋弯曲产生的桥面板整体附加弯矩的影响很小,组合桥面受力以第3体系为主,相应截面弯矩达到了总弯矩的75%,而在其他区域,第3体系受力所占比重迅速衰减,组合桥面受力以第2体系为主;加载至300kN时,组合桥面板受力仍处于弹性阶段,UHPC层顶面最大横向应力达到11.9 MPa仍未开裂,满足设计要求。
[Abstract]:As a study on orthotropic steel and ultra high performance concrete (UHPC) light composite deck structure, in the role of local wheel load transverse force and lateral force performance, a full scale model of static load test and finite element numerical simulation. The static load test of a full-scale model of lateral loading test simply supported condition and transverse cantilever condition, by changing the boundary conditions to simulate the composite bridge deck in different stress state, and the test results were compared with the results of finite element analysis, to validate the finite element model, and then using the analysis results of finite element models are combined in the local bridge deck under wheel load the transverse force composition. The results show that the composite bridge deck under wheel loads, the lateral force of local effect is obvious, the transverse stress is mainly confined to near the loading area of two U fan rib Within the affected area; in wheel load, the influence produced by the transverse bending bridge deck overall bending moment is very small, the force in third composite deck system, the corresponding bending moment reached 75% of the total moment, and in other regions, the third system stress proportion rapidly decline, by the combination of deck the second system is the main force; loading to 300kN, composite deck were still in the elastic phase, UHPC layer of the top surface of the transverse stress reaches 11.9 MPa, not cracking, meet the design requirements.

【作者单位】：湖南大学土木工程学院;湖南大学风工程与桥梁工程湖南省重点实验室;中铁大桥勘测设计院集团有限公司;
【基金】：国家自然科学基金项目(51178177) 交通运输部重大科技项目(2011318494160) 湖南省科学技术厅项目(2012FJ2007)
【分类号】：U441

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