scholarly journals Numerical Evaluation of Dynamic Responses of Steel Frame Structures with Different Types of Haunch Connection Under Blast Load

2020 ◽  
Vol 10 (5) ◽  
pp. 1815
Author(s):  
Mustafasanie M. Yussof ◽  
Jordan Halomoan Silalahi ◽  
Mohd Khairul Kamarudin ◽  
Pei-Shan Chen ◽  
Gerard A. R. Parke
Keyword(s):  
Dynamic Analysis ◽  
Dynamic Performance ◽  
Blast Loading ◽  
Steel Frame ◽  
Dynamic Responses ◽  
Blast Load ◽  
Structural Dynamic ◽  
Finite Element Software ◽  
Steel Frame Structures ◽  
Ductility Ratio

This research is aimed at investigating the dynamic behaviour of, and to analyse the dynamic response and dynamic performance of steel frames strengthened with welded haunches subjected to a typical hydrocarbon blast loading. The structural dynamic analysis was carried out incorporating the selected blast load, the validated 3D model of the structures with different welded haunch configurations, steel dynamic material properties, and non-linear dynamic analysis of multiple degree of freedom (MDOF) structural systems. The dynamic responses and effectiveness of the reinforced connections were examined using ABAQUS finite element software. Results showed that the presence of the welded haunch reinforcement decreased the maximum frame ductility ratio. Based on the evaluation of the results, the haunch reinforcements strengthened the selected steel frame and improved the dynamic performance compared to the frame with unreinforced connections under blast loading, and the biggest haunch configuration is the “best” type.

Seismic Performance Evaluation for Steel-Frame-Structure Considering Member Fracture

2017 ◽  
Author(s):  
Kensuke Shiomi
Keyword(s):  
Performance Evaluation ◽  
Dynamic Response ◽  
Dynamic Analysis ◽  
Seismic Performance ◽  
Ground Motions ◽  
Steel Frame ◽  
Frame Structures ◽  
Seismic Performance Evaluation ◽  
Steel Frame Structures

Through the 2011 Tohoku Earthquake or the 2016 Kumamoto Earthquake, much larger earthquakes are considered recently in the seismic designs of large steel-frame structures. When structures are exposed by these severe ground motions, partial destructions in the structures, such as damage or fracture of members could happen. Especially, the low cycle fatigue of steel structures because of the repeated load from these long-term ground motions is a serious problem. However, current seismic performance evaluation method based on nonlinear dynamic analysis considers only elastic and plastic deformation of each member, excluding the fracture of members. If this member fracture happens during earthquakes, there is considered to be many effects on the seismic performance, like the changes of the vibration property, the dynamic response and the energy absorbance capacity of structures. Therefore, the fracture of members is preferably taken into account in the seismic performance evaluation for these large earthquakes. This paper proposes the dynamic analysis method for steel-frame structures which can express the member fracture. Dynamic analyses considering and not considering member fracture under the repeated loads supposing the long-term earthquake are conducted to the FEM model of full-scale structure. By comparing each result, the effects of considering member fracture to the seismic performance such as the dynamic response and the energy absorbance capacity are discussed.

Dynamic damage assessment of float glass under blast loading

2019 ◽  
Vol 22 (11) ◽  
pp. 2517-2529
Author(s):  
Xiao-Qing Zhou ◽  
Ming-Yu Wang ◽  
Li-Xiao Li
Keyword(s):  
Damage Assessment ◽  
High Speed ◽  
Blast Loading ◽  
Material Model ◽  
The United States ◽  
Float Glass ◽  
Dynamic Responses ◽  
Kinematic Equation ◽  
Finite Element Software ◽  
Dynamic Damage

Architectural glass, especially the float glass, is a fragile part of a building. The architectural glass becomes a large amount of high-speed flying debris under bomb attacks and accidental explosions, thereby causing serious threat to residents. This study investigates the dynamic responses of a normal float glass subjected to blast loading using the explicit dynamic finite element software LS-DYNA. A JH-2 material model, which considers the strain rate effect and damage accumulation, is adopted for the float glass. A preliminary study shows that the present numerical model combined with reasonable material parameters can simulate the failure mode of the glass and the ejection velocity of glass fragments after failure. The verified model is then used to investigate the dynamic damage responses of the float glass under different loading cases. The damage assessment criterion of float glass is established on the basis of the glazing protection levels defined by the General Services Administration of the United States. Comprehensive simulations are conducted on different amounts of explosive and standoff distances. The degrees of glass damage under different loading cases are determined by combining the projection velocity of glass fragments after failure with a kinematic equation. Finally, the damage assessment diagram of float glass under different amounts of explosive is presented and compared with those in FEMA 426.

Dynamic Performance Analysis for a Butterfly-Shaped Arch Bridge

2010 ◽  
Vol 163-167 ◽  
pp. 74-78
Author(s):  
Hai Yun Huang ◽  
Xiang Rong Yuan ◽  
Ka Hong Cai
Keyword(s):  
Dynamic Analysis ◽  
Dynamic Characteristics ◽  
Dynamic Performance ◽  
Three Dimensional ◽  
Element Model ◽  
Loading Test ◽  
Structural Dynamic ◽  
Arch Bridge ◽  
Calculation Results ◽  
Dynamic Performance Analysis

The dynamic characteristics are not only the important indexes for evaluating the bridge structural rigidity, but also the principal parameters for structural dynamic analysis and earthquake resistant analysis. In this paper, a three dimensional solid finite element model for a butterfly-shape arch bridge in Zhongshan city was established to analyze the dynamic characteristics. By comparison the numerical calculation results with measured results of the dynamic loading test, an analysis and evaluation of the dynamic performance of this new type spatial arch bridge was made, and can serve as reference to the dynamic analysis and seismic design of similar bridges.

Structural Dynamic Analysis and Optimization of High-Speed Precision Machining Center Column

2013 ◽  
Vol 655-657 ◽  
pp. 48-51
Author(s):  
Fu Qiang Wang ◽  
Zhi Yuan Rui ◽  
Dong Ping Zhao ◽  
Chun Li Lei
Keyword(s):  
Dynamic Analysis ◽  
High Speed ◽  
Dynamic Performance ◽  
Optimization Theory ◽  
Structure Optimization ◽  
Precision Machining ◽  
Variation Analysis ◽  
Optimization Scheme ◽  
Structural Dynamic ◽  
Machining Center

The theory of structural dynamic analysis is put forward firstly. Then the dynamic performance of HMC80 high-speed precision machining center column is analyzed by means of finite element method. The dynamic performance of the column is analyzed using structural dynamic optimization theory and variation analysis with the thickness of wall plate and the inner rib plates as the parameters thirdly. Based on the analysis results, the structure optimization scheme of the column is obtained. The structure optimization scheme is analyzed and the analysis results show that the dynamic performance of the column optimization scheme is improved obviously.

Dynamic analysis of a suspended pump in a vertical well connected to the ocean

1983 ◽  
Vol 10 (3) ◽  
pp. 481-491 ◽  
Author(s):  
Bassem M. Eid ◽  
Sheldon H. Zemell
Keyword(s):  
Complex System ◽  
Dynamic Analysis ◽  
Water Intake ◽  
Hydrodynamic Force ◽  
Salt Water ◽  
Vertical Wall ◽  
Dynamic Responses ◽  
Water Level Fluctuations ◽  
Wave System ◽  
Structural Dynamic

In the design of a salt-water intake system which is connected to the ocean, a numerical model is developed to simulate the hydraulic and structural dynamic responses to the ocean's wave action. On the basis of available data, the design wave height is determined from the condition for breaking. For such a complex system, wherein several natural periods are contributing to the total response, a range of wave periods is considered. The standing wave system resulting from the reflection of a progressive wave train from a vertical wall (clapotis) is modelled and the hydrodynamic response of the system is computed. To limit water level fluctuations in the well, a strong damping of the water column is provided by constricting the flow through an orifice plate installed at the bottom of the pump well. The hydrodynamic force on the suspended pumps due to nearby submerged turbulent jet flow is described. A damped single-degree-of-freedom oscillator is employed to represent the structural dynamics of the pumps. Extensive experiments are required to supplement this work in order to describe the complex system fully. Keywords: dynamic analysis, salt-water intake, waves, hydrodynamic force, suspended pump, submerged jet, oscillator.

Engineering Application of External Prestressing Curved Beam

2013 ◽  
Vol 639-640 ◽  
pp. 1249-1252
Author(s):  
Min Yuan Huang ◽  
Zong Ren Zou
Keyword(s):  
Control Parameter ◽  
Dynamic Performance ◽  
Natural Vibration Frequency ◽  
Curved Beam ◽  
Structural Dynamic ◽  
Main Research ◽  
Finite Element Software ◽  
External Prestressing ◽  
Anchoring System ◽  
Dynamic Performance Analysis

Using the finite element software ANSYS to analyze dynamic characteristics of external prestressing structure, reasonable control parameter, as well as external prestressing reinforcement joints of security, the main research contents and results are as follows: Dynamic performance analysis is about variation law and internal feature. With the increase of external prestressing, on the contrary, the natural vibration frequency will reduce. However, external prestressing effects on the structural dynamic performance improvement that is not obvious in general. Based on sensitivity analysis, control parameter of external prestressing reinforcement curved beam must be analyzed and the reasonable value range of sensitive control parameter can be found. For the control parameter of external prestressing process, its reasonable control parameter’s range should be about 6% in the theoretical calculation. While simulating of anchoring system, local force on anchoring system must be analyzed finely and accurately. A comprehensive understanding should be mastered on variation law, which is about the internal forcing and stress response of special area. The setting of anchoring device shall be arranged at 1/3 place of original prestressing position. To ensure the safety, it should guarantee the mechanical continuity of anchor joints.

Numerical simulations on static and dynamic response of full-scale mast structures for H-Darrieus wind turbine

2020 ◽  
pp. 0309524X2091731
Author(s):  
Fateh Ferroudji ◽  
Lakhdar Saihi ◽  
Khayra Roummani
Keyword(s):  
Wind Turbine ◽  
Vertical Axis ◽  
Dynamic Responses ◽  
Mode Shapes ◽  
Manufacturing Cost ◽  
Vertical Axis Wind Turbine ◽  
Structural Dynamic ◽  
Finite Element Software ◽  
Von Mises ◽  
Von Mises Stresses

Mast structure is one of the most important parts of a vertical-axis wind turbine which supports generator and rotor and represents one-third of the overall costs in the production of a standard wind turbine (approximately 30%). All this may cause significant economic and physical losses when it is damaged or collapsed. The purpose of this research is to investigate numerically the static strength and structural dynamic responses of 10-kW vertical-axis wind turbine masts subjected to the aerodynamic and gravity loadings (according to the IEC 61400-2:2006 and EN 1991-1-4:2005 standards) using the SolidWorks finite element software. Mast structures with four different heights (12, 14, 16, and 18 m) and three various outer diameters (0.6, 0.7, and 0.8 m), in each height configuration, were evaluated. These analyses were performed to identify the stiffness, resistance, reliability, and natural frequency stiffness requirements within the mast structures, in order to save manufacturing cost. Based on static analysis, no structural failure is predicted for all masts during wind turbine operation according to maximum von Mises stresses at the bottom of the mast and maximum total deflections on the top of the mast. In addition, the dynamic parameters of these 12 models of masts have been studied to obtain the natural frequencies and corresponding mode shapes. Finally, the recommendations to avoid resonance and design strategy for each mast model are discussed.

Structural Dynamic Analysis of a Tidal Current Turbine Using Geometrically Exact Beam Theory

2017 ◽  
Vol 140 (2) ◽  
Author(s):  
Qi Wang ◽  
Pengkun Zhang ◽  
Ye Li
Keyword(s):  
Dynamic Analysis ◽  
Tidal Current ◽  
Dynamic Performance ◽  
Beam Theory ◽  
Structural Dynamic ◽  
Discrete Vortex ◽  
Geometrically Exact Beam ◽  
Tidal Current Turbine ◽  
Geometrically Exact Beam Theory ◽  
Current Turbine

This paper presents a numerical study of the dynamic performance of a vertical axis tidal current turbine. First, we introduce the geometrically exact beam theory along with its numerical implementation the geometric exact beam theory (GEBT), which are used for structural modeling. We also briefly review the variational-asymptotic beam sectional analysis (VABS) theory and discrete vortex method with free-wake structure (DVM-UBC), which provide the one-dimensional (1D) constitutive model for the beam structures and the hydrodynamic forces, respectively. Then, we validate the current model with results obtained by ANSYS using three-dimensional (3D) solid elements and good agreements are observed. We investigate the dynamic performance of the tidal current turbine including modal behavior and transient dynamic performance under hydrodynamic loads. Finally, based on the results in the global dynamic analysis, we study the local stress distributions at the joint between blade and arm by VABS. It is concluded that the proposed analysis method is accurate and efficient for tidal current turbine and has a potential for future applications to those made of composite materials.

Sign in / Sign up

Export Citation Format

Share Document