Displacement-Based Assessment of Seismic Resistance for Transfer Structure with Haunching Braces

2011 ◽  
Vol 243-249 ◽  
pp. 557-562
Author(s):  
Wei Sheng Liang ◽  
Jian Cai
Keyword(s):  
Seismic Resistance ◽  
Engineering Practice ◽  
Seismic Events ◽  
Feature Based ◽  
New Type ◽  
Beam Type ◽  
Plastic Displacement ◽  
Transfer Structure ◽  
Displacement Based ◽  
Resistance Performance

The beam-type transfer structure has recently been well adopted in multi-purpose buildings. A new type of transfer structure with haunching braces is introduced in this paper through static elasto-plastic analysis of example structure with specific focus on its unique feature. Based of the deformation damaged criteria, seismic resistance performance for transfer structure with haunching braces is assessed. The results indicate that elastic and elasto-plastic displacement of structure under minor, medium and major seismic events designed against 7 degree seismic fortification intensity satisfy the requirement of the current standards, the structure’s damage status under minor and medium seismic events is Almost Intact and the structure’s damage status under major seismic events is Minor Damage. It can provide reference for engineering practice.

Sublimation of composite ice and its influence on performance of ice shells

2021 ◽  
Vol 36 (1) ◽  
pp. 67-77
Author(s):  
Yue Wu ◽  
Junkai Huang ◽  
Jiafeng Chen
Keyword(s):  
Numerical Simulation ◽  
Shell Structure ◽  
Composite Shell ◽  
Engineering Practice ◽  
Sublimation Rate ◽  
Long Span ◽  
Static Performance ◽  
New Type ◽  
Ice Sublimation ◽  
Composite Shell Structure

The long-span ice composite shell structure is a new type of ice and snow structure developed in recent years. The engineering practice of ice composite shell shows that sublimation is one of the important reasons for its damage and even collapse. In this paper, we firstly supplemented the existing H-K equation and obtained the revised ice sublimation equation through indoor evaporative plate experiment considering the influence of admixtures and wind speed. Afterwards, combining the simulations of solar radiation and CFD, the numerical simulation of sublimation distribution on the surface of were realized by programming in Grasshopper platform. During sublimation, the thickness of the ice composite shell decreases by 0.38 mm every 10 days and the sublimation rate on the sunny side was 1.7 times that on the shady side. Finally, the static performance and stability of the sublimated ice composite spherical shell were analyzed. After 70 days of sublimation, the thickness of the ice composite shell structure becomes thinner and uneven, which leads its sensitivity to external load increases.

scholarly journals Reinforced concrete bridge pier ductility analysis for different levels of detailing

2017 ◽  
Vol 10 (5) ◽  
pp. 1042-1050
Author(s):  
R. W. SOARES ◽  
S. S. LIMA ◽  
S. H. C. SANTOS
Keyword(s):  
Reinforced Concrete ◽  
Axial Loading ◽  
Structural Element ◽  
Reinforced Concrete Column ◽  
Elastoplastic Behavior ◽  
Response Modification Factor ◽  
Concrete Confinement ◽  
Plastic Displacement ◽  
Displacement Based ◽  
Ductility Capacity

Abstract The structural design under seismic loading has been for many years based on force methods to consider the effects of energy dissipation and elastoplastic behavior. Currently, displacement-based methods are being developed to take into account elastoplastic behavior. These methods use moment-curvature relationships to determine the ductility capacity of a structural element, which is the deformation capacity of the element before its collapse. The greater the plastic displacement or rotation a structural member can achieve before it collapses, the more energy it is capable of dissipating. This plastic displacement or rotation capacity of a member is known as the member ductility, which for reinforced concrete members is directly related to efficient concrete confinement. This study investigates at which extents transverse reinforcement detailing influences reinforced concrete column ductility. For this, a bridge located in Ecuador is modeled and analyzed, and its ductility evaluated considering several cases of axial loading and concrete confinement levels. After the performed displacement-based analyses, it is verified whether the response modification factor defined by AASHTO is adequate in the analyzed case.

scholarly journals Finite Element Failure Analysis of GFRP Laminates in Plate-Cone Reticulated Shell

2020 ◽  
Vol 2020 ◽  
pp. 1-12
Author(s):  
Xing Wang ◽  
Yu Jiang ◽  
Yonghui Huang ◽  
Yue Huang ◽  
Fan Wang
Keyword(s):  
Failure Analysis ◽  
Composite Laminates ◽  
Strength Criterion ◽  
Laminated Plates ◽  
Engineering Practice ◽  
Analysis Model ◽  
Ansys Software ◽  
Strength Failure ◽  
New Type ◽  
Element Failure

Plate-cone reticulated shell is a new type of spatial structures with good mechanical behavior, technical economy, and architectural appearance. In this paper, using ANSYS software, the strength failure analysis model of composite laminates is established in cooperation with the Strength Criterion of Hoffman. The effects of layer number, laying direction, and thickness of laminates on the ultimate strength of laminates are studied by detailed parametric analysis, which provides a theoretical basis for the design of composite plate-cone reticulated shell and GFRP laminated plates. Some important conclusions are obtained and can be applied to engineering practice.

Behavior of Double-Wall Precast Concrete Shear Wall under Low-Cyclic Reversed Loading Test

2014 ◽  
Vol 1079-1080 ◽  
pp. 354-358 ◽  
Author(s):  
Quan Dong Xiao ◽  
Zheng Xing Guo ◽  
Zhong Yuan Zhang
Keyword(s):  
Precast Concrete ◽  
Shear Walls ◽  
Shear Wall ◽  
Seismic Resistance ◽  
Loading Test ◽  
Ongoing Research ◽  
Reversed Loading ◽  
Resistance Performance ◽  
Double Wall

This paper describes an ongoing research program on the seismic resistance performance of the double-wall precast concrete (DWPC) shear wall. Low-cyclic reversed loading test of three new full scale specimens are carried out based on the previous studies. The test results indicate that DWPC shear walls have higher initial stiffness, cracking load, yielding load and ultimate load. The displacement ductility ratios of DWPC shear walls are no less than that of cast-in-situ shear wall. The hysteretic curves of all specimens are plump, and the trend of skeleton curves is basically the same. The seismic energy dissipation capacities of DWPC specimens are close to those of cast-in-situ specimen. All the specimens have shown favorable seismic resistance performance.

Cut not smashed: a new type of evidence for nut exploitation from Sulawesi

Antiquity ◽  
2001 ◽  
Vol 75 (289) ◽  
pp. 497-498 ◽  
Author(s):  
Victor Paz
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Environmental Samples ◽  
Recent Analysis ◽  
Clear Cut ◽  
Feature Based ◽  
New Type ◽  
Age Range ◽  
Tool Types ◽  
Scanning Electron

In archaeology the recovery of ‘nuts’ means the recovery of any hard-shelled fruit or seeds, further qualified as those eaten by people. Recent analysis of environmental samples from Leang Burung-1 in the Maros district of Sulawesi (FIGURE 1) led to the recovery of a charred, almost intact nut, in deposits with an age range of 1430±600 BC (ANU-390) (Bulbeck 1997; Mulvaney & Soejono 1970).The nut has a clear cut mark starting from the tapered end, running along the long axis. The cut was established as an incision and not a taphonomic feature based on observations under light microscopy and Scanning Electron Microscopy, where the cut could be seen scraping the outer tissue (FIGURE 2). The cut was probably made before charring, using a sharp tool to cut deep enough for the instrunent to pry open one of the locules to get to one of three kernels. Based on the associated materials recovered from the site, the cut probably was made using one of several flaked tool types recovered from the area, such as a levallois point — part of the Maros region blade assemblage (FIGURE 3).

Technical Research on Application of Warm Mix Flame-Retardant Noise Reduction Asphalt Mixture

2015 ◽  
Vol 723 ◽  
pp. 435-439
Author(s):  
Xi Rong Wu ◽  
Su Xian Li
Keyword(s):  
Noise Reduction ◽  
Flame Retardant ◽  
Hot Mix Asphalt ◽  
Asphalt Mixture ◽  
Jiangxi Province ◽  
Engineering Practice ◽  
Result Show ◽  
New Type ◽  
Research On Application ◽  
Special Environment

Due to the special environment of the tunnel, the paper developed a kind of antiflaming, warm-mix and noise reduction asphalt mixture combined with engineering practice chishui tunnel project in jiangxi province. Asphalt mixture has good performance in low mixing temperature, flame retardant, noise reduction and better performance by using AMP flame-retardant and Evotherm DAT warmed-mix technology. A series of test are carried out to analyze the characteristics of high temperature rutting, low temperature crack resistance and water stability of warmed mix flame retardant noise reduction asphalt mixture and Ordinary hot mix asphalt mixture. The result show that, compared with the pavement performance of ordinary hot mix asphalt mixture AC-13, the new type of asphalt mixture OGFC-13 has good cooling, flame retardant and noise reduction performance.

F-Bar Aided Edge-Based Smoothed Finite Element Method with 4-Node Tetrahedral Elements for Static Large Deformation Elastoplastic Problems

2019 ◽  
Vol 16 (05) ◽  
pp. 1840010 ◽  
Author(s):  
Yuki Onishi
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Large Deformation ◽  
Element Formulation ◽  
Tetrahedral Elements ◽  
Smoothed Finite Element Method ◽  
New Type ◽  
Displacement Based ◽  
Edge Based ◽  
Element Method

A new type of smoothed finite element method (S-FEM), F-barES-FEM-T4, is demonstrated in static large deformation elastoplastic cases. F-barES-FEM-T4 combines the edge-based S-FEM (ES-FEM) and the node-based S-FEM (NS-FEM) for 4-node tetrahedral (T4) elements with the aid of the F-bar method in order to resolve the major issues of Selective ES/NS-FEM-T4. As well as most of the other S-FEMs, F-barES-FEM-T4 inherits pure displacement-based formulation and thus has no increase in DOF. Moreover, the cyclic smoothing procedure introduced in F-barES-FEM-T4 is effective to adjust the smoothing level so that pressure checkerboarding (oscillation) is suppressed reasonably. Some examples of static large deformation analyses for elastoplastic materials proof the excellent performance of F-barES-FEM-T4 in contrast to the conventional hybrid T4 element formulation.

scholarly journals Verification of Monolithic Rotary Cutting Tool For Active Driven Rotation Machining

2021 ◽  
Author(s):  
Andrej Czán ◽  
Richard Joch ◽  
Michal Šajgalík ◽  
Jozef Holubjak ◽  
Andrej Horák ◽  
...  
Keyword(s):  
Cutting Speed ◽  
Life Time ◽  
Cutting Parameters ◽  
Engineering Practice ◽  
Assembly Accuracy ◽  
Acceptable Quality ◽  
New Type ◽  
Rotary Cutting ◽  
Basic Characteristics ◽  
Machining Productivity

Abstract Forced rotation turning appears to be an effective machining method due to higher tool life, time efficiency and acceptable quality. Several studies have been carried out to investigate the basic characteristics of forced rotation machining. So far, tools are used whose design included several components. However, such tools may generate vibrations, which are undesirable in the process. In engineering practice, most vibration problems are solved by reducing the cutting parameters (cutting speed and feed rate), which reduces machining productivity. For this reason, a new type of monolithic rotary tool has been designed that eliminates the design complexity and high assembly accuracy requirements of current rotary tools. The presented solution fundamentally validates the new monolithic tool for forced rotation technology and defines its application for different machining materials.

Repair limit policy of aircraft component based on extended uncertain random renewal reward process

2022 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Chunxiao Zhang ◽  
Xinwang Li ◽  
Xiaona Liu ◽  
Qiang Li ◽  
Yizhou Bai
Keyword(s):  
Programming Model ◽  
Civil Aviation ◽  
Maintenance Cost ◽  
Engineering Practice ◽  
Content Type ◽  
Limit Time ◽  
Aircraft Component ◽  
New Type ◽  
Reward Process ◽  
Renewal Reward Process

PurposeThe purpose of this paper is to focus on an optimizing maintenance policy with repair limit time for a new type of aircraft component, in which the lifetime is assumed to be an uncertain variable due to no historical operation data, and the repair time is a random variable that can be described by the experimental data.Design/methodology/approachTo describe this repair limit time policy over an infinite time horizon, an extended uncertain random renewal reward theorem is firstly proposed based on chance theory, involves uncertain random interarrival times and stochastic rewards. Accordingly, the uncertain random programming model, which minimized the expected maintenance cost rate, is formulated to find the optimal repair limit time.FindingsA numerical example with sensitivity analysis is provided to illustrate the utility of the proposed policy. It provides a useful reference and guidance for aircraft optimization. For maintainers, it plays an important guiding role in engineering practice.Originality/valueThe proposed uncertain random renewal reward process proved useful for the optimization of maintenance strategy with maintenance limited time for a new type of aircraft components, which provides scientific support for aircraft maintenance decision-making for civil aviation enterprises.

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