Influence of U-shaped stiffeners on the blast-resistance performance of steel plates

2022 ◽  
Vol 188 ◽  
pp. 107046
Author(s):  
Lu Gan ◽  
Zhouhong Zong ◽  
Jin Lin ◽  
Yuli Chen ◽  
Mengtao Xia ◽  
...  
Keyword(s):  
Blast Resistance ◽  
Steel Plates ◽  
Resistance Performance

scholarly journals Keragaan Sifat Tahan Penyakit Blas dan Agronomi Populasi Silang Balik dan Haploid Ganda Turunan IR64 dan Oryza rufipogon

2016 ◽  
Vol 16 (2) ◽  
pp. 90
Author(s):  
Dwinita W. Utami ◽  
A. Dinar Ambarwati ◽  
Aniversari Apriana ◽  
Atmitri Sisharmini ◽  
Ida Hanarida ◽  
...  
Keyword(s):  
Double Haploid ◽  
Blast Resistance ◽  
Oryza Rufipogon ◽  
Screening Tests ◽  
Recurrent Parent ◽  
Wild Rice Species ◽  
Backcross Populations ◽  
Haploid Population ◽  
The One ◽  
Resistance Performance

<p>Blast Resistance Performance of Promising Lines Derived from Backcross and Double Haploid Population Between IR64 and Oryza rufipogon. Developing blast resistance varieties with superior agronomical performance has been the one of the important priorities in rice breeding program. Based on the purpose of this study the double haploid and backcross populations were developed using the most popular cultivar IR64 as recurrent parent and wild rice species Oryza rufipogon (Acc. IRGC 105491) as blast resistance donor parent. This study was initiated to analyze the blast resistance and agronomical performance of double haploid populations (DH_I, DH_II and DH_III) and backcross populations (BC2, BC3, and BC5), based on the green house and field screening tests. The results of statistical analysis showed that the blast resistance performance of DH population were diverse among DH_I, DH_II and DH_III. The smallest diversity was on the DH_III population. The same results were also detected on BC populations. The smallest diversity was on BC5 population. The diversity comparison between DH and BC population showed that DH_III population had smaller variation than BC5. Indicated that DH_III population has the most fixed population. The agronomic performance evaluation of DH_III population selected lines showed that Bio1, Bio2, and Bio8 qualitified as the candidate of promising lines.</p><p> </p><p><strong>Abstrak</strong></p><p>Perakitan varietas tahan blas sebagai galur harapan, merupakan salah satu prioritas dalam program pemuliaan padi. Dalam rangka mendukung program tersebut, telah dilakukan pembentukan populasi haploid ganda (HG) dan silang balik (BC) dengan IR64 sebagai tetua berulang dan Oryza rufipogon (No. aksesi IRGC 105491) sebagai tetua donor gen tahan penyakit blas. Penelitian ini bertujuan menganalisis keragaan tingkat ketahanan galur-galur haploid ganda (HG_I, HG_II, dan HG_III) dan galur-galur silang balik (BC2, BC3, dan BC5) terhadap penyakit blas di rumah kaca dan lapang, sehingga diperoleh kandidat galur harapan. Hasil pengujian beberapa populasi HG dan BC menunjukan bahwa terdapat variasi keragaan yang berbeda-beda. Variasi paling kecil terdapat pada populasi HG_III. Hasil yang sama juga diperoleh pada populasi silang balik (BC2-BC5). Variasi paling kecil terdapat pada populasi BC5. Bila dibandingkan antar populasi HG dan BC, tingkat variasi pada populasi HG_III lebih kecil dibandingkan dengan tingkat variasi pada populasi BC5. Hal ini menunjukkan bahwa tingkat homosigositas paling tinggi terdapat pada populasi HG_III. Berdasarkan evaluasi penampilan agronomis beberapa galur HG_III terpilih, diperoleh tiga galur kandidat galur harapan Bio1, Bio2, dan Bio8.</p>

scholarly journals Blast-Resistant Performance of Hybrid Fiber-Reinforced Concrete (HFRC) Panels Subjected to Contact Detonation

2019 ◽  
Vol 10 (1) ◽  
pp. 241
Author(s):  
Wenjin Yao ◽  
Weiwei Sun ◽  
Ze Shi ◽  
Bingcheng Chen ◽  
Le Chen ◽  
...  
Keyword(s):  
Reinforced Concrete ◽  
Blast Resistance ◽  
Plain Concrete ◽  
Fiber Reinforced Concrete ◽  
Fiber Reinforced ◽  
Steel Fiber Reinforced Concrete ◽  
Hybrid Fiber ◽  
Hybrid Effect ◽  
Pva Fiber ◽  
Resistance Performance

This paper experimentally investigates the blast-resistant characteristics of hybrid fiber-reinforced concrete (HFRC) panels by contact detonation tests. The control specimen of plain concrete, polypropylene (PP), polyvinyl alcohol (PVA) and steel fiber-reinforced concrete were prepared and tested for characterization in contrast with PP-Steel HFRC and PVA-Steel HFRC. The sequent contact detonation tests were conducted with panel damage recorded and measured. Damaged HFRC panels were further comparatively analyzed whereby the blast-resistance performance was quantitively assessed via damage coefficient and blast-resistant coefficient. For both PP-Steel and PVA-Steel HFRC, the best blast-resistant performance was achieved at around 1.5% steel + 0.5% PP-fiber hybrid. Finally, the fiber-hybrid effect index was introduced to evaluate the hybrid effect on the explosion-resistance performance of HFRC panels. It revealed that neither PP-fiber or PVA-fiber provide positive hybrid effect on blast-resistant improvement of HFRC panels.

Steel Plate Behavior under Blast Loading-Numerical Approach Using LS-DYNA

2016 ◽  
Vol 842 ◽  
pp. 200-207 ◽  
Author(s):  
Vu Minh Thanh ◽  
Sigit P. Santosa ◽  
Djarot Widagdo ◽  
Ichsan Setya Putra
Keyword(s):  
Blast Resistance ◽  
Blast Loading ◽  
Numerical Approach ◽  
Coupling Method ◽  
Steel Plates ◽  
Computational Time ◽  
Arbitrary Lagrangian Eulerian ◽  
Ale Method ◽  
Wide Range ◽  
Coupling Algorithm

Plate is one of the most common structural elements, which appears in a wide range of applications: steel bridges, blast-resistance door, and armored vehicles. In this paper, the behavior of steel plates under blast loading was studied through numerical approaches using LS DYNA and then the results were compared with the experiment results obtained from existing literatures. The study of a clamped square plate exposed to blast loading in three distinct stand-off distances. Three different methods of modeling blast loading were used, namely: empirical blast method, arbitrary Lagrangian Eulerian (ALE) method, and coupling of Lagrangian and Eulerian method. The empirical blast method was deployed by using key card *LOAD_BLAST in LS-DYNA. In ALE method, Langrangian and Eulerian solution were combined in the same model and the fluid-structure interaction (FSI) handled by coupling algorithm. In coupling method, the engineering load blast in LS-DYNA (*LOAD_BLAST_ENHANCED) was coupled with the ALE solver. In terms of central deflection and computational time, the coupling method appeared to be the best method which is very time-effective and showed a good correlation with the experiment data.

scholarly journals Numerical Analysis-Based Blast Resistance Performance Assessment of Cable-Stayed Bridge Components Subjected to Blast Loads

2020 ◽  
Vol 10 (23) ◽  
pp. 8511
Author(s):  
Jungwhee Lee ◽  
Keunki Choi ◽  
Chulhun Chung
Keyword(s):  
Numerical Analysis ◽  
Blast Resistance ◽  
Assessment Process ◽  
Public Nature ◽  
Bridge Structures ◽  
Set Up ◽  
Existing Bridges ◽  
Resistance Performance ◽  
Selection Of ◽  
Cable Stayed Bridges

Cable-stayed bridges are infrastructure facilities of a highly public nature; therefore, it is essential to ensure operational safety and prompt response in the event of a collapse or damage, which are caused by natural and social disasters. Among social disasters, blast accidents can occur in cable-stayed bridges as a result of explosions produced by vehicle collisions or terrorist attacks; this can lead to the degradation in their structural performances and subsequent collapse. In this research, a procedure to assess structural blast-resistance performance is suggested based on a numerical analysis approach, and the feasibility of the procedure is demonstrated by performing an example assessment. The suggested procedure includes (1) selection of major structural components that severely affect the global structural behavior, (2) set-up blast hazard scenarios consisting of various blast levels and locations, and (3) assessment of the components using numerical blast simulation. By performing an example assessment, the critical blast level for each component could be determined and the blast location that affects the considering components the most severely could be found as well. The scenario-based assessment process employed in this study is expected to facilitate the evaluation of bridge structures under blasts in both existing bridges and future designs.

Evaluation on the Blast Resistance of Fiber Reinforced Concrete

2011 ◽  
Vol 311-313 ◽  
pp. 1588-1593 ◽  
Author(s):  
Jeong Soo Nam ◽  
Gyu Yong Kim ◽  
Hiroyuki Miyauchi ◽  
Young Seok Jeon ◽  
Heon Kyu Hwang
Keyword(s):  
Reinforced Concrete ◽  
Fracture Mode ◽  
Steel Fiber ◽  
Blast Resistance ◽  
Fiber Reinforced Concrete ◽  
Back Side ◽  
Fiber Reinforced ◽  
Emulsion Explosive ◽  
Loss Of Life ◽  
Resistance Performance

Recently, the damaged building and loss of life have been increasing by man-made disasters. In this study, the blast resistance performance of fiber reinforced concrete against explosion was evaluated by the emulsion explosive and AUTODYN. The concrete without fiber was penetrated by emulsion explosive of 4605 kJ/kg and its back side was fractured heavily. The concretes with PVA, PE and Steel fiber have a higher blast resistance than that of concrete without fiber. Consequentially, the blast resistance of concrete was analyzed from viewpoint of fracture mode by AUTODYN and it was concluded that the fiber content is a beneficial for the blast resistance performance of concrete.

scholarly journals The Influence of Spraying Strategy on the Dynamic Response of Polyurea-Coated Metal Plates to Localized Air Blast Loading: Experimental Investigations

Polymers ◽  
2019 ◽  
Vol 11 (11) ◽  
pp. 1888 ◽  
Author(s):  
Yongqing Li ◽  
Changhai Chen ◽  
Hailiang Hou ◽  
Yuansheng Cheng ◽  
Haopeng Gao ◽  
...  
Keyword(s):  
Dynamic Response ◽  
Blast Resistance ◽  
Blast Loading ◽  
Steel Plates ◽  
Interface Condition ◽  
Air Blast ◽  
Coated Metal ◽  
Metal Plates ◽  
Partial Area ◽  
Air Blast Loading

Polyurea has attracted considerable attention owing to its potential applications in protective fields to improve the resistant performance of structures subjected to damage loads resulting from intentional or accidental explosions. However, different spraying strategies of polyurea may lead to significant differences in overall resistance performance of polyurea-coated structures, and the underlying mechanisms have not been clear until now. This study aims to elucidate the influence of spraying strategy, i.e., spraying area, spraying thickness, and spraying interface condition, on the dynamic response of polyurea-coated steel plates under localized air blast loading. Three types of plates manufactured using different spraying strategies were adopted to evaluate their blast-resistant performance. The spraying strategies used were (i) whole-area spraying, (ii) partial-area spraying, and (iii) in-contact backing of polyurea on the rear surfaces of steel plates. In addition, the influence of spraying thickness of polyurea for whole-area sprayed plates was evaluated. The energy absorbing mechanisms of polyurea backing layers were highlighted. The energy absorption of plates was quantitatively analyzed. The results show that the air blast resistances of whole-area sprayed and in-contact backed plates are both superior to, whereas that of partial-area sprayed plates is inferior to, bare steel counterparts. A suitable spraying thickness of polyurea can significantly reduce the damage of the front steel layer, whereas excessive spraying thickness decreases the overall air blast resistance of plates. The polyurea backing layer exhibits favorable performance in absorbing energy under a whole-area spraying condition. This study provides useful guidance for the design of polyurea-coated metal plates in engineering applications.

Field Test Study of the Blast-Resistance Performance of Optimal Composite Anchorage Structure

2011 ◽  
Vol 250-253 ◽  
pp. 1474-1477
Author(s):  
Lin Zhao ◽  
Xian Ming Zeng ◽  
Shi Min Li ◽  
Da Lu Lin
Keyword(s):  
Particle Acceleration ◽  
Blast Resistance ◽  
Dynamic Strain ◽  
Support Structure ◽  
Weakened Zone ◽  
Blast Energy ◽  
Test Study ◽  
Damage Condition ◽  
Resistance Performance ◽  
Explosion Condition

This paper introduced the comparison test of new optimal composite anchorage structure and single anchorage structure. The measured results show that the particle acceleration of single anchorage structure is 2.22 times higher than that of the optimal composite anchorage structure. The dynamic strain of the former is 5.3~4.5 times higher than that of the latter. The blast-resistance of the optimal composite anchorage structure is 5.10 times higher than that of the single anchorage structure. Under the limit damage condition, the former is 4.13~3.40 higher than that of the latter. The optimal composite anchorage structure has excellent blast-resistance. Optimal weakened zone is between the reinforced support structure and the surround rock. Under the explosion condition, weakened zone is firstly deformed, cracked, crushed or densified, and at the same time, a great deal of blast energy is absorbed. Therefore, the crisis of the reinforced support structure is transferred into the weakened zone.

Pressure–impulse response of semi-rigidly connected steel plates under blast loading

2016 ◽  
Vol 8 (1) ◽  
pp. 25-57 ◽  
Author(s):  
Xiaoshan Lin ◽  
Mahmud Ashraf
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Impulse Response ◽  
Blast Resistance ◽  
Plate Thickness ◽  
Three Dimensional ◽  
Element Model ◽  
Steel Plates ◽  
Pressure Impulse ◽  
Three Dimensional Finite Element

In this study, a three-dimensional finite element model is developed to investigate the pressure–impulse response of the steel plates with semi-rigid connections under blast loads. The strain rate effect on the material properties is considered, and a number of spring elements are used for simulating the plate to support connections. Once verified, the developed finite element model is then used to investigate the effects of a series of parameters on the blast resistance and energy absorption capability of the steel plates, including the effects of connection rigidity, plate thickness, impulse loading and the shape of corrugation.

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