Abstract The circumferential joint of a shield tunnel is prone to damage under strong earthquakes, affecting the safety tunnel. This paper adopts an innovative shape memory alloy (SMA) flexible for longitudinal seismic mitigation SMA composed ring springs and ordinary bolts. design performed tunnel, simplified model proposed. Based on generalised response displacement method, analysis conducted, arrangement joints discussed, performance evaluated. Results show that method can efficiently...

When calculating the seismic response of structures, conventional methods often neglect uncertainty and suffer from excessive computation. Although robustness metrics have been effective in evaluating structural safety, they are not suitable for isolated continuous girder bridges (ICGB). To address this issue, paper introduces an uncertain assessment method tailored to ICGB: Firstly, considers material parameters ground motion by constructing a data set using Monte Carlo simulation....

The collapse of transmission towers involves a series complex problems, including geometric nonlinearity, material dynamic and the failure members. Simulation process is difficult using traditional finite element method (FEM), which generated from continuum variation principle, whereas particle (FPM) enforces equilibrium on each point. Particles are free to separate one another, advantageous in simulation structural collapse. This paper employs simulate steel tower under earthquake ground...

Impact loads may cause serious or even fatal damage to the structure (component), in most existing specifications China, and there are no special terms that take impact load into consideration. So, response analysis of (component) under is very important. In this paper, sensitivity was conducted for 22 parameters Holmquist–Johnson concrete (HJC) constitutive model concrete, sensitive HJC identified with A , B G P l μ f c respectively. LS‐DYNA nonlinear transient finite element code used...

Damage identification that is based on modal analysis widely used in traditional structural damage identification. However, difficult high damping structures and concentrated structures. Unlike approaches analysis, the frequency response function allows for avoidance of error easy verification through other test points. An updating algorithm devised this study by utilizing together with dynamic reduction respect to selected design parameters. Numerical results indicate method can be define...

Dynamic stability of machine tool spindle during operations is dependent on many parameters including the speed, bearing preload, and thermal effect. In this article, a finite element-based model presented, which uses Timoshenko beam theory to obtain frequency response at tip. The effects preload temperature rising characteristics milling system are therefore investigated. It was found that has same critical cutting depth as first natural system. This result verifies fact close relationship...

In this article, an eight-degree-of-freedom (eight-DOF) model is presented to study the dynamic characteristics of a machine-tool spindle system supported by ball bearings. model, effects bearing clearance, speed, and cutting conditions are studied. To system, numerical simulations carried out. Results in form bifurcation diagrams, Poincaré maps, phase trajectories. These results show that regions periodic, subharmonic, chaotic behaviour strongly dependent on clearance speed. Apart from...

Article Multiple Resonances and Nonlinear Behaviors of a Spindle Ball Bearings System with 3/2 Term was published on July 1, 2009 in the journal International Journal Sciences Numerical Simulation (volume 10, issue 7).

In the process of collapse failure space steel frame subjected to earthquake excitation, complex behaviors often are involved, including geometric nonlinearity, material fracture, contact, and collisions. view unique advantages finite particle method analyze structural nonlinear problems, this paper utilized as basic means analysis used MATLAB software for computational analysis. This first derived a method‐based model, conducted static dynamic response under compared findings with ANSYS...