千秋大桥静载试验研究

文章以千秋大桥主跨静载试验为例,介绍利用桥梁专用软件建立全桥模型进行模拟,计算得出理论值,同时在试验现场取得了详细的测试数据,通过对理论值与实测值进行对比分析,提出了相关建议。     

框架式电动车车身结构的有限元分析

文章采用ANSYS有限元软件,对电动车车身骨架及其载荷进行了适当简化,建立了某电动车车身骨架结构的有限元模型.通过对车身骨架在弯曲、扭转、紧急制动和紧急转弯4种工况,施加相应的边界条件和载荷条件下,进行了静态响应分析,并且计算出车身骨架在自由状态下的前7阶模态特性.指出了车身骨架结构中的薄弱部位,为电动车车身骨架进行结构设计提供了理论依据.     

大客车车身结构的力学分析

通过对客车车身结构的静态、动态分析,从车身结构的刚度指标（承载和振动特性）,说明车身结构的一般分析方法。结构的整体性使载荷按车身结构各主要组成部分的刚度进行分配,在确定车辆振动、噪声和乘坐舒适性时,线性分析对结构设计的作用。     

Efficient time-domain approach for hydroelastic-structural analysis including hydrodynamic pressure distribution on a moored SFT

This study investigates the hydroelastic analysis of a moored SFT (submerged floating tunnel) and the corresponding hydrodynamic pressure distribution under wave excitations. Time-domain discrete-module-beam (DMB) method, in which an elastic structure is modeled by multiple sub-bodies with beam elements, is employed to express the deformable tunnel with multiple mooring lines. Moreover, the top-down scheme is also adopted for detailed structure analyses with less computational cost, which applies the calculated hydrodynamic pressure distribution over SFT's surface to the three-dimensional finite element model. The hydrodynamic pressure includes both wave-induced diffraction pressure and motion-induced radiation pressure. For the validation of the developed numerical approach, comparisons are made with computationally intensive hydroelastic-structural direct-coupled method, two-dimensional wave flume experiment, and independently developed inhouse moored-SFT-simulation program. Furthermore, the influences of flexural motions with buoyancy-weight ratio (BWR) (or bending stiffness) and regular/irregular wave conditions on the dynamic pressure distribution and the resulting local stresses are investigated.