Progressive Collapse Mechanics of Reticulated Dome under Impact

2011 ◽  
Vol 255-260 ◽  
pp. 1760-1764
Author(s):  
Duo Zhi Wang ◽  
Jun Wu Dai ◽  
Feng Fan ◽  
Xu Dong Zhi
Keyword(s):  
Kinetic Energy ◽  
Potential Energy ◽  
Strain Energy ◽  
Failure Modes ◽  
Impact Load ◽  
Progressive Collapse ◽  
Single Layer ◽  
Initial Kinetic Energy ◽  
Impact Zone ◽  
Reticulated Domes

FE models of both the single-layer Kiewitt reticulated domes and the impactor were developed incorporating ANSYS/LS-DYNA. Three failure modes for Kiewitt reticulated dome under impact load are discerned. Moreover, Global collapse of structure belongs to the progressive collapse, and is the most serious failure. After this, stress of members, velocity and strain energy of each component are introduced to display the progressive process of collapse. It shows that the dome does not defend impact load as a whole. Each component of structure is impacted and dented in turn. And the collapse enlarges from impact zone to the supports of dome. Furthermore, collapse relates to energy transform among kinetic energy, stain energy and potential energy of structure. Moreover, collapse will continue, if initial kinetic energy and release of potential energy of structure exceed the strain needed.

Failure modes and failure mechanisms of single-layer reticulated domes subjected to interior blasts

2018 ◽  
Vol 132 ◽  
pp. 208-216 ◽  
Author(s):  
Jialu Ma ◽  
Feng Fan ◽  
Lingxin Zhang ◽  
Chengqing Wu ◽  
Xudong Zhi
Keyword(s):  
Failure Modes ◽  
Failure Mechanisms ◽  
Single Layer ◽  
Reticulated Domes

Dynamic Response of Reticulated Domes under the Impact

2014 ◽  
Vol 638-640 ◽  
pp. 58-61
Author(s):  
Chang Wu ◽  
Xiu Li Wang ◽  
Ya Xiong Liang ◽  
Zhan Zhong Yin
Keyword(s):  
Dynamic Response ◽  
Failure Modes ◽  
Numerical Models ◽  
Single Layer ◽  
Response Mode ◽  
Object Size ◽  
Response Modes ◽  
Reticulated Domes ◽  
Parametric Analyses ◽  
The Impact

As the study of the dynamic response of single-layer reticulated domes under impact, Numerical models for single-layer Kiewitt-6 reticulated domes with sub steel cube column were established by the ANSYS/ LS-DYNA program and a dynamic analysis were carried out. Four failure modes for the reticulated domes were put forward according as the dynamic response and plastic deformation. The parametric analyses on the dynamic response of single-layer reticulated domes with sub steel cube column under the impact loading are carried out, by changing the impact velocity, mass of impact object, size of impact object and impact location.The effects of these parameters on the response mode of the structures are investigated, and the distribution regularity of the response modes of the structures with different parameters is explained.

Damage and Risk Assessment for Single-Layer Reticulated Domes Subject to Explosive Blast Loads

2017 ◽  
Vol 17 (09) ◽  
pp. 1750108 ◽  
Author(s):  
X. D. Zhi ◽  
M. G. Stewart
Keyword(s):  
Structural Damage ◽  
Progressive Collapse ◽  
Dynamic Performance ◽  
Single Layer ◽  
Standoff Distance ◽  
Protective Measure ◽  
Blast Loads ◽  
Structural Dynamic ◽  
Damage States ◽  
Reticulated Domes

In order to provide a better understanding of the dynamic behavior of single-layer reticulated domes subjected to explosive blast loads, a number of analyses are carried out on structures with different standoff distances ([Formula: see text]), explosive weights ([Formula: see text]), rise–span ratios ([Formula: see text] and other parameters. An equation for a structural damage factor is proposed to evaluate structural damage quantitatively. The damage states for single-layer reticulated domes are defined based on their structural dynamic performance and corresponding damage factors. Structural reliabilities for different standoff distances are obtained using the Monte-Carlo Analysis. A typical protective measure is bollards which are used to help ensure a minimum standoff distance. To illustrate the cost-effectiveness of such a protective measure, structural damage states and various losses, including direct and indirect economic loss and maimed and fatality loss, are considered for assessing the risk reduction, costs and benefits. It was found that the bollards significantly reduce the likelihood of structural progressive collapse or severe damage, and the optimal standoff distance can be determined.

scholarly journals Detailed Calculations of Correlations Occurring in Light-Particle-Accompanied Spontaneous Fission

1972 ◽  
Vol 25 (5) ◽  
pp. 499
Author(s):  
AR de L Musgrove
Keyword(s):  
Kinetic Energy ◽  
Potential Energy ◽  
Point Charge ◽  
Spontaneous Fission ◽  
Initial Kinetic Energy ◽  
Point Charge Model ◽  
Trajectory Calculations ◽  
Charge Model ◽  
Experimental Values ◽  
High Degree

Detailed trajectory calculations are made for (a-particle-, triton-, and proton- accompanied fission of 252Cf. Comparison between experimental values of the quantity and those deduced from the classical three point charge model suggests either that the initial Coulomb potential energy at scission has a narrow distribution (a result found by Feather 1971) or that a high degree of anticorrelation occurs between the initial potential energy and the initial kinetic energy of the fissioning system. In the latter case, the initial potential energy may be much broader.

Failure modes for single-layer reticulated domes under impact loads

2008 ◽  
Vol 14 (S1) ◽  
pp. 545-550 ◽  
Author(s):  
Feng Fan ◽  
Duozhi Wang ◽  
Xudong Zhi ◽  
Shizhao Shen
Keyword(s):  
Failure Modes ◽  
Single Layer ◽  
Impact Loads ◽  
Reticulated Domes

Effect of wave reflection on failure modes of single-layer reticulated domes subjected to interior blast loading

2019 ◽  
Vol 105 ◽  
pp. 266-275
Author(s):  
Jialu Ma ◽  
Feng Fan ◽  
Lingxin Zhang ◽  
Chengqing Wu ◽  
Xudong Zhi
Keyword(s):  
Failure Modes ◽  
Wave Reflection ◽  
Single Layer ◽  
Blast Loading ◽  
Reticulated Domes

Impact Response and Failure Mode for Single-Layer Geodesic Spherical Domes under Impact Load

2013 ◽  
Vol 351-352 ◽  
pp. 80-84
Author(s):  
Duo Zhi Wang ◽  
Feng Fan ◽  
Xu Dong Zhi ◽  
Jun Wu Dai
Keyword(s):  
Dynamic Response ◽  
Failure Mode ◽  
Failure Modes ◽  
Impact Load ◽  
Single Layer ◽  
Impact Response ◽  
Impact Location ◽  
Parametric Analyses ◽  
The Impact ◽  
Local Dent

Based on the ANSYS/LS-DYNA software, the analysis for the 40m span geodesic spherical domes under impact load is carried out. By changing the mass of impact object, impact velocity and impact location, the parametric analyses on the dynamic response of the structures under the impact loading are carried out. The three failure modes of the spherical domes are summed up: local dent of structure and global collapse of structure, Punch failure of structure. Then the characteristics of the dynamic response of the structure with different failure mode, such as the impact course, impact load, speed of nodes, displacement of nodes, and stress of bars, are investigated. It is further improvement of failure mode for single-layer reticulated dome under impact.

Failure Modes for Single-Layer Reticulated Domes under Oblique Impact

2012 ◽  
Vol 166-169 ◽  
pp. 1284-1289
Author(s):  
Duo Zhi Wang ◽  
Feng Fan ◽  
Jun Wu Dai ◽  
Xu Dong Zhi ◽  
Zhenggang Cao ◽  
...  
Keyword(s):  
Dynamic Response ◽  
Numerical Simulations ◽  
Failure Modes ◽  
Single Layer ◽  
Oblique Impact ◽  
Large Numbers ◽  
Impact Position ◽  
Global Collapse ◽  
Reticulated Domes ◽  
The Impact

FE models of both the single-layer Kiewitt-8 reticulated domes with a span of 60m and the cylindrical impactor were developed incorporating ANSYS/LS-DYNA. Afterward, fourteen groups impact are simulated by changing the impact position or impacted angle on reticulated dome, and impact velocity and mass of impactor are changed for each group impact. On the basis of large numbers of numerical simulations, characteristics of dynamic response for reticulated dome under impact are shown. And four failure modes (Members slightly damaged, Local collapse of dome, Global collapse of dome, Members shear failed) are presented for single-layer Kiewitt-8 reticulated dome under diverse impact. The distributing of failure modes for the fourteen types impact are different from each other, and the adverse position and angle are summrized.

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