基于LS-DYNA与耦合方法的简支板桥车桥振动分析

发布时间：2018-04-15 00:38

本文选题：简支板桥 + LS-DYNA　；参考：《公路工程》2017年02期

【摘要】：简支空心板桥是我国小跨径桥梁中广泛采用的桥型之一。这类桥梁具有重量轻、整体性好、自振频率高的特点,且在高速重载车辆的作用下易导致车桥间产生较大的动力相互作用。这一现象不仅影响车辆行驶的舒适度,而且会对桥梁结构产生不利影响,降低桥梁寿命。将当前广泛应用的车桥耦合方法与动力有限元软件LS-DYNA结合起来,建立了一种全新的车桥耦合三维仿真分析模型。车桥耦合模型中的车辆模型采用了简化的三维9自由度车辆模型,简化了车辆建模并提高了计算效率。基于一简支现浇空心板桥的现场试验,将由这种耦合方法得到的仿真分析结果与实桥测试动力响应进行对比分析。结果表明,测试结果和仿真模拟结果吻合良好,验证了这种新的车桥耦合三维仿真分析模型的正确性和有效性。
[Abstract]:Simply supported hollow slab bridge is one of the widely used bridge types in small span bridges in China.This kind of bridge has the characteristics of light weight, good integrity, high natural vibration frequency, and it is easy to cause a large dynamic interaction between the vehicles and bridges under the action of high-speed and heavy-haul vehicles.This phenomenon not only affects the comfort of the vehicle, but also adversely affects the bridge structure and reduces the bridge life.Combining the widely used vehicle-bridge coupling method with the dynamic finite element software LS-DYNA, a new three-dimensional simulation model of vehicle-bridge coupling is established.The vehicle model in the vehicle-bridge coupling model adopts the simplified 3D 9-DOF vehicle model, which simplifies the vehicle modeling and improves the computational efficiency.Based on the field test of a simply supported cast-in-place hollow slab bridge, the simulation results obtained by this coupling method are compared with the test dynamic response of the real bridge.The results show that the test results are in good agreement with the simulation results, and the validity and validity of the new model are verified.
【作者单位】：湖南大学土木工程学院风工程与桥梁工程湖南省重点实验室;
【基金】：湖南省自然科学基金项目资助(13JJ2019) 高等学校博士学科点专项科研基金资助(20110161120025)
【分类号】：U441.3

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