- 截稿日期： 2019年11月4日
Biography: Dr. Yahia Al-Smadi, Assistant Professor, has a professional life experience in many fields includes Synthesis and analysis of mechanisms and machinery, Finite element method, nonlinear dynamic response of structure and soft tissues to extreme loading, biomechanics and wearable robots. He is currently serving as Transfer Technology Officer (TTO) at Department of Mechanical Engineering, Jordan University of Science and Technology and Director of Autonomous Platforms Lab.
Topic: Tissue-structure Interaction and Response to Impulsive Loading
Abstract: The purpose of this speech is, to provide the non-linear biodynamic response of tissue-structure interaction under extreme impulsive loading like blast and crash through the analytical and numerical simulation methods. The numerical simulation is conducted using finite element analysis (FEA) software for modeling biomechanical correct human model. Vibration mathematical model and dynamic model includes resonance frequency, damping co-efficient, stiffness constant and extinction time for different kind of physique. Due to complexity of tissue-structure, mobility and materials which has multi degrees of freedom, three dimensional models are generated from micro tomography (μCT-scan) and computational biomechanical analysis forces was performed in LS-DYNA. Non-linear material properties for tissues and structure are considered. The cortical bone is heterogeneous in nature and has viscoelastic properties. Also biologically tissue is treated as a viscoelastic material The model- calculated deflections and forces were analyzed. The result strongly depends on the modeling of the tissue-structure interaction which is used in numerical simulation collected from the FEA software. This indicates the necessity of the correlation between the results of the experimental data, if available, and the results from the from nonlinear simulation modeling.
Biography: Dr. Zhongkun Zhang, excellent professor at the Binzhou University of China, postdoctoral researcher of Civil Engineering of Tongji University，Beijing Olympic bid special merit award winner. Member of expert of Beijing dangerous construction projects, expert of Beijing urban rail transit engineering. Ever in charge of engineering projects：China Cement Plant construction, Bangladesh Barapukuria coal mine construction, CRBC(China Road and Bridge Corporation) Ethiopia Highway construction, EPC(Engineering Procurement Construction) bidding for Hongkong Special Administrative Region, Beijing Olympic National Stadium and Wukesong Stadium and Olympic Village Construction bidding, Beijing Yizhuang Metro Line Construction etc.
Topic: Determination of Grouped Piles’ Effective Length Based on Numerical Analysis Solution
Abstract: In recent years, there has been an increasing amount of literature on piles’ effective length. A number of studies have found that the single pile’s effective length could be computed by means of different methods which are unsuitable for grouped piles’ computation. In order to understand how the effective length of piles should be calculated, a series of studies was performed in this paper. On the basis of numerical analysis for grouped piles foundation, the computed results indicate the existence of piles’ effective length. Taking an engineering example as a case, both the finite element analysis and the semi-analytical element analysis are used for analyzing. It is revealed that the influencing factors of grouped piles’ effective length are as follows: the pile-soil modulus ratio, top load distribution area, pile diameter, etc. The grouped piles’ effective length increases gradually with the increasing top load distribution area. Although it is difficult to use an appropriate formula to reflect the influence of various factors on the grouped piles length, different various factors can be considered in the numerical simulation analysis. The influencing factors on the grouped piles’ effective length should be considered synthetically. An example of highway in-situ study makes the grouped piles’ effective length be understood deeply both in theory and practice.