J. L. Zhang

• Xiamen University

Based on 76-storey Benchmark model, the optimization objective including displacement reduction index and acceleration reduction index is given under the effect of wind-induced vibration, by which kinds of dampers are optimally designed based on Genetic Algorithm. The optimization results show that the peak acceleration, peak displacement and peak...

Many new control techniques and energy dissipation systems which can decrease the response of wind vibration and earthquake. But there is less research on the mixed control system of Damper and TMD. In order to improve the shortcomings of Damper system and TMD system, combining their respective advantages reasonably, the mixed control system of Dam...

The novel passive energy dissipation system named Damped Outrigger System for frame-core tube structure is introduced in recent years, in which the outrigger and perimeter columns are separate, and the vertically acting fluid-viscous dampers connect the end of each of the outrigger walls to the adjacent perimeter column. In this paper, a new simpli...

In the former research, the Damper control system, TMD control system and the Mixed Control of the active control and passive control were all optimized alone. It is found that less research of the optimization is on the Mixed Control of the Damper system and TMD system. In order to achieve better control effect, we venture to propose a Mixed Contr...

The different characteristics of pavement structure layer has been found that it can be directly reflected by FWD (falling weight deflectometer) deflection basin. However, the existing back-calculation method for the pavement modulus is regarded as complex, highly specialized approaches, hence, it is mainly used for the scientific research and desi...

In this paper, FWD(Falling Weight Deflectmeter) load stress distribution coefficient is used to calculate the modulus of pavement structure course as the initial value of modulus, the deflection value of the modulus of the derivative matrix is established. Based on the traditional iterative method, the initial value of the modulus being constantly...

Current industry standard "Highway Performance Assessment Standards" in china is proposed to investigate and evaluate the highway pavement quality, including each individual index of pavement performance and its comprehensive evaluation method. However, this comprehensive evaluation method is ineffective in certain particular conditions. In this pa...

The basic deformation modes of a hybrid stress element are obtained by separating the stress modes corresponding to the different deformation modes of a hybrid stress element. Consequently a basic deformation-based approach is presented to investigate the performance for a given hybrid stress element. It is shown that the element deformation modes...

It is still a serious challenge for structural engineers to effectively reduce the seismic responses of tall and super tall buildings to further improve these structural safeties. In order to solve this problem, in this article a new kind of structural configuration, named passive mega-sub controlled structure (PMSCS), is presented, which is constr...

In this paper, the passive control approach to three dimensional building structures excited by 2-dimensional earthquake ground motions is presented by using Bi-direction tuned masse damper (TMD) system. The mathematic model of a multi-storey building structure including the TMD system is established and its combined equation of motion is given. Th...

The artificial neural network (ANN) models are presented for diagnosing pile in this paper based on the pile integrity test (PIT) also known as low strain dynamic test. The back-propagation learning algorithm is employed to train the network for extracting knowledge from training examples. There are fifty-three input neurons in the network includin...

A new method on vibration control and optimal design for three-dimensional building structures is presented in this paper. Firstly, the mathematical model of a typical three-dimensional shear-type structure is established which considering the damping devices installed in the structure. Then, the optimal design of damping devices is investigated in...

Two adjacent parallel building structures are connected by control devices including stiffness and damping components. These building structures are currently used in engineering since the control devices may reduce the dynamic responses in earthquake and wind excitation. But the connecting stiffness may chance dynamic characteristics of whole buil...

Hybrid finite element methods are superior to conventional displacement-based finite element formulations in many aspects and to date many types of hybrid elements have been proposed based on different assumed stress fields. However, some of them are essentially equivalent to each other and there is no general approach available yet to determine th...

For hybrid finite elements, if an assumed stress field does not contain enough appropriate stress modes, the resulting element will include zero-energy deformation modes and thus can not be used for pratical applications [1–3]. On the other hand, adding extra stress modes will require more computational effort. For a finite element including n degr...

Significant magnitudes of interlaminar normal and shear stresses have been observed near the free edges of composite plates and this free-edge phenomenon has become a benchmark index commonly used to study the composite delamination [1]. It is also noticed that composite materials often exhibit nonlinear behavior to an extent and thus satisfying re...

The nonlinear hybrid stress finite element method for Hahn-Tsai composite materials is established successfully. The Newton-Raphson iteration technique is employed to solve the displacement nonlinear equations of the structure. To save the computer cost, the element stress field can be computed by the simple iteration method from the nodal displace...

In this paper, a damage detection and localization algorithm, which is suitable for the implementation of automated damage detection system based on the wireless structural monitoring sensing network, is presented. Vibration signals obtained from sensors are modeled as autoregressive moving average (ARMA) time series. Coefficients of the ARMA model...

Based on the dynamic properties of main and secondary structures and the orthogonality condition of structural mode shapes, dynamic responses and response spectra of the two structures are investigated in the frequency domain using the modal truncation technique. Transfer functions and root-mean-square of acceleration response of equipment are dire...

The passive mega-subcontrolled structure proposed recently is a new form of structure associated with the design and construction of supertall buildings. However, a shortcoming still exists in its structural configuration. In this paper, a new configuration of the passive mega-subcontrolled frame is proposed. A more realistic analytical model of th...

This paper presents the results of a combined experimental and analytical/computational study of interfacial fracture between dissimilar materials. Analytical expressions are derived for the computation of strain energy release rates and mode mixities in a new dissimilar mixed-mode bending (DMMB) specimen. The energy release rates are compared with...

The results of a detailed study of the effects of composite microstructure on the micromechanisms of tensile damage in a symmetric []2s Ti-15Al-3Cr-3Al-3Sn (Ti-15-3)/SiC (SCS-6) composite are presented. Matrix micro-structure is controlled by heat treatment, which is used to produce metastable β or Widmänstatten α + β microstructures. The sequence...

A hybrid polygonal element method is proposed for the micromechanical analysis of heterogeneous materials with randomly distributed rigid ellipses or elliptical voids. An arbitrarily-shaped n-sided polygonal mesh is used to discretize a random heterogeneous medium. The conformal mapping technique is employed to construct special shape functions for...

A microstructure-based finite element analysis is presented in this paper for the mechanical response of two dimensional heterogeneous materials with randomly dispersed inclusions. A special n-sided polygonal element containing an elastic inclusion is developed on the basis of the Hellinger-Reissner principle and the hybrid finite element method. T...

A hybrid finite element approach is proposed for the mechanical response of two-dimensional heterogeneous materials with linearly elastic matrix and randomly dispersed rigid circular inclusions of arbitrary sizes. In conventional finite element methods, many elements must be used to represent one inclusion. In this work, each inclusion is embedded...

A new hybrid finite element method is presented for the mechanical analysis of heterogeneous materials with randomly dispersed inclusions. A special n-sided polygonal element with an elastic inclusion is developed on the basis of the Hellinger-Reissner principle. The element formulations are derived by decomposing the original problem into inclusio...

Accorsi has recently proposed a general method for modelling microstructural material discontinuities in a finite element analysis. In this work, it is shown that his method can be significantly simplified. In particular, the transformation strain (eigenstrain) plays no role in his application. Numerical results based on the simplified equations wi...