scholarly journals Study on the Failure Mechanism of Frame Structure under the Diluted Debris Flow Impact

2017 ◽  
Author(s):  
Peizhen LI ◽  
Shanhua YANG ◽  
Xilin LU
Keyword(s):  
Debris Flow ◽  
Failure Mechanism ◽  
Frame Structure

Push-over Analysis on the Failure Mechanism of Reinforced Concrete Frame Structure

2013 ◽  
Vol 663 ◽  
pp. 42-48
Author(s):  
Tie Cheng Wang ◽  
Xiao Hui Gu ◽  
Hai Long Zhao
Keyword(s):  
Reinforced Concrete ◽  
Failure Mechanism ◽  
Constitutive Relations ◽  
Frame Structure ◽  
Reinforced Concrete Frame ◽  
Plastic Hinges ◽  
Concrete Frame ◽  
Weak Beam ◽  
Story Drift ◽  
Height Increase

A reinforced concrete frame model was designed by PKPM software and then a push-over analysis is performed in this paper. Values of plastic hinges were calculated by Section Builder software, which based on constitutive relations of material and the section forms, then the data was written into corresponding components in the model to carry out push-over analysis. The plastic hinges first appeared at the ends of beams in the first story ,spread to the second story and the ends of columns in the first story. At last plastic hinges spread to the top story. The story drift and interstory displacement rotation of the model in different cases tended to decrease as structural height increase. It can be demonstrated that failure mechanism satisfies the design requirements of strong column weak beam.

Collapsed Form Simulation of Styles of Different Structures under Earthquake Based on ANSYS/LS-DYNA

2011 ◽  
Vol 243-249 ◽  
pp. 6197-6201
Author(s):  
You Liang Fang ◽  
Bing Yin Gao ◽  
Jing Yao Duan
Keyword(s):  
Failure Mechanism ◽  
Seismic Waves ◽  
Steel Frame ◽  
Frame Structure ◽  
Frame Structures ◽  
Whole Process ◽  
Different Types ◽  
Steel Frame Structures ◽  
Earthquake Effects ◽  
Steel Frame Structure

In this paper, different types of steel frame structure under earthquake are adopted as the analyzed object of structural collapse. Seismic waves can be applyed into the structure in form of dynamic acceleration in ANSYS/LS-DYNA. The whole process of earthquake effects on the structure is simulated truly. It is helpful to realize and understand the failure mechanism and space mechanism of the different forms of steel frame structures. This paper can also provide a reference for reinforcement and maintenance of structure and a basis of anti-seism design of structure.

Dynamic process and failure mechanism of rammed building structure subject to debris flow

2021 ◽  
Author(s):  
Qiang Zou ◽  
Cong Li ◽  
Bin Zhou ◽  
Zhenru Hu ◽  
Hu Jiang
Keyword(s):  
At Risk ◽  
Dynamic Response ◽  
Debris Flow ◽  
Failure Mechanism ◽  
Rammed Earth ◽  
Building Structure ◽  
Response Characteristics ◽  
The Impact ◽  
Debris Flow Hazard ◽  
Elements At Risk

<p>The failure mechanism of building structure is important for quantitatively assessing vulnerability of elements at risk, which is a critical step in risk assessment of debris flow. Scholars have recently made great processes in the researches on debris flow hazard effects and vulnerability of elements at risk. Statistical analysis methods have widely used to analyze field survey data and build vulnerability functions. Based on numerical simulation and model experiment, structural dynamic response process was analyzed to evaluate structure vulnerability. However, due to the lack of quantitative relationship between the debris flow hazard-forming mechanism and the dynamic response of building structure, it is essential to analyze the dynamic response characteristics and process of building structure subject to debris flow, which would play an important guiding role in disaster prevention and disaster mitigation.</p><p>Through hazard field investigation, the failure modes of rammed earth building caused by debris flow were summarized as burying, scouring and impact. Figure 1 shows the debris flow hazard in Jiende Gully, Liangshan. In addition, by using the finite element analysis method, the structure model of rammed earth building was established to simulate to the impact process of debris flow on the structure. During the dynamic failure process of rammed earth building shown in Figure 2, the failure types of building wall impacted by the debris flow mainly presented at crushed failure of the impact point, tensile failure of the inside wall and shear failure of the corner. Then debris flow destroyed the gable wall, rushed into the room, and broke the doorway, which resulted in damage of the longitudinal wall. Moreover, the response characteristics and failure mechanism of rammed earth buildings under the impact of debris flow further show that the integrity of rammed earth building is poor and the development of cracks cuts off the propagation path of stress, which effectively protects other walls. The transform-shape locations of the rammed earth building including were initially destroyed at the points of the wall foundation, corners of wall and the points impacted by big rocks of debris flow. Therefore, the reinforced measures on the locations where stress suddenly changes, such as wall foundations and wall corners should be paid more attention to protect rammed structure of buildings.</p><p><img src="https://contentmanager.copernicus.org/fileStorageProxy.php?f=gepj.451b729a870062696011161/sdaolpUECMynit/12UGE&app=m&a=0&c=2ed88a397ba9c221f12dfdaaa040b3d2&ct=x&pn=gepj.elif&d=1" alt=""><img src="https://contentmanager.copernicus.org/fileStorageProxy.php?f=gepj.84a0a2aa870068796011161/sdaolpUECMynit/12UGE&app=m&a=0&c=b7eec20b0a3f0afb5c82791d9e72d449&ct=x&pn=gepj.elif&d=1" alt=""></p>

scholarly journals Performance of RC frame structure with various beam to column flexural capacity ratio – a case study

2017 ◽  
Vol 4 ◽  
pp. 17-23
Author(s):  
Sudip Karanjit
Keyword(s):  
Failure Mechanism ◽  
Frame Structure ◽  
Gradual Change ◽  
Rc Frame ◽  
Building Structures ◽  
Flexural Capacity ◽  
Gradual Improvement ◽  
Capacity Curve ◽  
Frame Buildings ◽  
Rc Frame Buildings

The effectiveness of various Strong Column Weak Beam (SCWB) factors to enhance seismic performance is assessed for Reinforced Concrete (RC) frame building structures. In this study five RC frame buildings of different storey numbers have been analysed using different column overdesign factors. The results are compared as the influence of various SCWB factor over the expected performance of selected RC frame buildings in terms of enhancement in capacity and failure mechanism. With the lower value of SCWB factor insignificant change in capacity curve is observed while gradual improvement is observed with the higher factors. In terms of failure mechanism gradual change from column failure mechanism to beam failure is observed but the hinge formation at the base of bottom storey column is seen even with the higher value of SCWB factor. The effectiveness of alternative method of column flexural capacity enhancement by proposed modified SCWB (MSCWB) was also studied. MSCWB is found to be more effective in terms of enhancement in capacity curve and failure mechanism.

Study on Seismic Performance of Infilled Frame of Underlying Weak Layer

2012 ◽  
Vol 204-208 ◽  
pp. 1028-1033
Author(s):  
Guang Yu Lei ◽  
Yu Yao Zeng ◽  
Can Guo Jin
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Failure Mechanism ◽  
Time History ◽  
Element Model ◽  
Frame Structure ◽  
Housing System ◽  
Weak Layer ◽  
Infilled Frame ◽  
Weak Beam

After the Wenchuan earthquake, a large number of infilled frame structure of underlying weak layer (the bottom of non-filled walls, the upper wall of clouds filling) of the housing system did not appear "weak beam strong column" of the failure mode. Established pure frame structure of finite element model which considered the quality of in filled wall without taking into account of its stiffness and strength and the frame of finite element model which contains filler wall, and carried out elastic-plastic time-history analysis with established finite element model of two under earthquake, through analysis and comparison understand reasons which infilled frame structure of underlying weak layer did not achieve the "weak beam strong column" ductile failure mechanism, and further explored how to achieve "weak beam strong column" failure mechanism for infilled frame structure of underlying weak layer, raised a number of assurance measures.

On the role of tin underlays for the prevention of thermal grooving in thin gold films

1986 ◽  
Vol 44 ◽  
pp. 732-733
Author(s):  
Jin Young Kim ◽  
R. E. Hummel ◽  
R. T. DeHoff
Keyword(s):  
Thin Film ◽  
Free Surface ◽  
Grain Boundary ◽  
Beneficial Effect ◽  
Failure Mechanism ◽  
Failure Mechanisms ◽  
Distinct Advantage ◽  
Gold Films ◽  
Gold Thin Film

Gold thin film metallizations in microelectronic circuits have a distinct advantage over those consisting of aluminum because they are less susceptible to electromigration. When electromigration is no longer the principal failure mechanism, other failure mechanisms caused by d.c. stressing might become important. In gold thin-film metallizations, grain boundary grooving is the principal failure mechanism.Previous studies have shown that grain boundary grooving in gold films can be prevented by an indium underlay between the substrate and gold. The beneficial effect of the In/Au composite film is mainly due to roughening of the surface of the gold films, redistribution of indium on the gold films and formation of In2O3 on the free surface and along the grain boundaries of the gold films during air annealing.

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