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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。
In order to study the transverse force performance and transverse force of UHPC light weight composite deck structure under partial wheel load, the full-scale model static load test and finite element method Numerical Simulation. Static load tests were carried out on the same full-scale model, respectively, under the condition of simply supported transverse load and lateral cantilever load test. Through the variation of boundary conditions, the different stress states of the composite deck were simulated and compared with the results of finite element analysis Then the correctness of the finite element model is verified, and then the lateral force composition of the composite deck under local wheel load is obtained by the analysis results of the finite element model. The results show that under the wheel load, the composite bridge deck has obvious lateral force and the lateral stress is mainly confined to two U-ribs near the load area. In the area affected by wheel load, Of the total additional bending moment of the bridge deck has little effect on the combined deck to the third system, the corresponding section of the bending moment reached 75% of the total bending moment, while in other regions, the third system, the proportion of the force The second deck system is the main component of the composite bridge deck. When the load reaches 300 kN, the force of the composite bridge deck is still in the elastic phase. The maximum lateral stress at the top of the UHPC layer reaches 11.9 MPa and still does not crack, meeting the design requirements.