SHOCK RESILIENCE OF STRUCTURAL PILLARS IN NAVAL VESSELS

2021 ◽  
Vol 159 (A1) ◽  
Author(s):  
J C Rigby ◽  
C Moss ◽  
G Thomas
Keyword(s):  
Impulse Loading ◽  
Structural Members ◽  
Open Spaces ◽  
Underwater Explosions

Although structural pillars are extensively used in commercial vessels, traditionally their use on board UK warships has been discouraged. This is due to the tendency of pillars to “punch through” the deck when subjected to the high impulse loading of shock from underwater explosions (UNDEX). There are however many spaces within naval ships that would significantly benefit from the wide-open spaces created from the use of pillars as opposed to full bulkheads, such as machinery rooms, mooring decks and accommodation flats. This paper re-addresses the question of a shock capable pillar, looking at how a pillar can be designed or mounted to increase its resilience to shock from underwater explosions. It is proposed that the advice against the use of pillars in warships could be unfounded; this is supported by the fact that not all navies reject their use. The results of this study imply that as long as the pillar is sited properly on primary structural members, then pillar buckling should occur long before “punch though”.

Shock Resilience of Structural Pillars in Naval Vessels

2017 ◽  
Vol Vol 159 (A1) ◽  
Author(s):  
J C Rigby ◽  
C Moss ◽  
G Thomas
Keyword(s):  
Impulse Loading ◽  
Structural Members ◽  
Open Spaces ◽  
Underwater Explosions

Although structural pillars are extensively used in commercial vessels, traditionally their use on board UK warships has been discouraged. This is due to the tendency of pillars to “punch through” the deck when subjected to the high impulse loading of shock from underwater explosions (UNDEX). There are however many spaces within naval ships that would significantly benefit from the wide-open spaces created from the use of pillars as opposed to full bulkheads, such as machinery rooms, mooring decks and accommodation flats. This paper re-addresses the question of a shock capable pillar, looking at how a pillar can be designed or mounted to increase its resilience to shock from underwater explosions. It is proposed that the advice against the use of pillars in warships could be unfounded; this is supported by the fact that not all navies reject their use. The results of this study imply that as long as the pillar is sited properly on primary structural members, then pillar buckling should occur long before “punch though”.

Spherical Acrylic Plastic Hulls Under External Explosive Loading

1977 ◽  
Vol 99 (2) ◽  
pp. 469-479
Author(s):  
J. D. Stachiw
Keyword(s):  
Internal Surface ◽  
Explosive Loading ◽  
Impulse Loading ◽  
Underwater Explosions ◽  
Acrylic Plastic ◽  
Explosive Charges ◽  
Sufficient Magnitude ◽  
Peak Pressures

NEMO-type acrylic spherical hulls have been subjected to underwater explosions in order to determine their resistance to hydrodynamic impulse loading. Six 15-in. OD and one 66-in. OD spheres have been subjected to explosions of sufficient magnitude to initiate fracture in the hull. The tests were conducted at simulated depths of 10, 100, 1000, and 2000 ft utilizing explosive charges of 1.1, 8.2, 14.6, 169.9, 387.8, and 688.6 grams. The tests have shown that an acrylic sphere will fracture in 0–50 ft depths range under dynamic peak pressures that are smaller in magnitude than static pressures required for general implosion of the sphere. At depth that is equal to 0.2 of static implosion pressure, the magnitude of dynamic peak pressures must be in excess of the static implosion pressure before fracture of the acrylic sphere is initiated. Fractures were generally initiated on the internal surface of the sphere at two locations: (a) at a point closest to the explosive and (b) at a point most remote from the explosive. The fractures were generally in the shape of a star.

Review on Experimental Study on Effect of Corrosion In Reinforced Concrete Fly-Ash Beam

2020 ◽  
pp. 92-96
Author(s):  
Shubham N. Dadgal ◽  
Shrikant Solanke
Keyword(s):  
Fly Ash ◽  
Bond Strength ◽  
Structural Damage ◽  
Pullout Test ◽  
Partial Replacement ◽  
Structural Members ◽  
Accelerated Corrosion ◽  
Resistivity Method ◽  
Electrical Resistivity Method ◽  
Structural Failures

In modern days for structures in coastal areas it has been observed that the premature structural failures are occurs due to corrosion of the reinforcements of the designed structural member. The corrosion causes the structural damage which in turn leads to reduction in the bearing capacity of the concerned structural members. The aim of this study was to study the effect of partial replacement of fly ash to minimize the corrosion effect. Beams were designed and corroded by using artificial method known accelerated corrosion method. The beams were then tested for flexural and bond strength. Also the weight loss of the reinforced bars was been determined using electrical resistivity method. The fly ash will replace by 10% and 15%.The strength will calculate at varying percentage of corrosion at 10% and 15%. Beams will cast at M25 grade concrete. The flexural strength will test by using UTM and the bond strength will calculate using pullout test.

The Place of Traditional Artists in the Preservation of Nigerian Art

2018 ◽  
pp. 75-88
Author(s):  
Victoria N Osuagwu
Keyword(s):  
Belief Systems ◽  
Sacred Grove ◽  
Art World ◽  
Human Beings ◽  
Open Spaces ◽  
Economic Resource ◽  
The People ◽  
Traditional Artists ◽  
Global Art ◽  
Source Of Information

Human beings have always left signs of their activities behind them. These signs take both tangible and intangible forms, including buildings, sites, sculptural works, antiquities, rock art paintings, belief systems, and traditions. The people of this millennium have recognized the remains of our fore-bears namely archaeological, architectural monuments, sites, and cultural works as an integral part of the cultural heritage of all humanity. They also recognized the fact that heritage is an invaluable source of information about the lives and activities of human beings and their artistic and technical capabilities over the centuries. The Nigerian Ancient Art Tradition which spans eight thousand years is a product of diverse artists from Dufuna, Nok, Igbo-Ukwu, Ife, Owo, Benin, Tada, etc. Also remarkable are the sculptural works created by late Susanne Wenger (an Austrian) and her New Sacred Art Movement in Osun-Osogbo Sacred Grove, which gave meaning to open spaces within the grove. This paper examines the role played by these artworks to project Nigeria to the global art world. The benefits to Nigeria and the global art traditions and recommendations on how to revive this dwindling economic resource will also be examined. The approach used was to study the artworks produced by some of these artists. Some of the findings were that the works were carefully done with suitable materials that have withstood climate change.

Utopian Visions in United States Urbanism

Moreana ◽  
2005 ◽  
Vol 42 (Number 164) (4) ◽  
pp. 157-186
Author(s):  
James M. McCutcheon
Keyword(s):  
United States ◽  
Los Angeles ◽  
New World ◽  
New Technology ◽  
World's Fair ◽  
Open Spaces ◽  
Central Park ◽  
Garden Cities ◽  
Oneida Community ◽  
The City

America’s appeal to Utopian visionaries is best illustrated by the Oneida Community, and by Etienne Cabet’s experiment (Moreana 31/215 f and 43/71 f). A Messianic spirit was a determinant in the Puritans’ crossing the Atlantic. The Edenic appeal of the vast lands in a New World to migrants in a crowded Europe is obvious. This article documents the ambition of urbanists to preserve that rural quality after the mushrooming of towns: the largest proved exemplary in bringing the country into the city. New York’s Central Park was emulated by the open spaces on the grounds of the Chicago World’s Fair of 1893. The garden-cities surrounding London also provided inspiration, as did the avenues by which Georges Haussmann made Paris into a tourist mecca, and Pierre L’Enfant’s designs for the nation’s capital. The author concentrates on two growing cities of the twentieth century, Los Angeles and Honolulu. His detailed analysis shows politicians often slow to implement the bold and costly plans of designers whose ambition was to use the new technology in order to vie with the splendor of the natural sites and create the “City Beautiful.” Some titles in the bibliography show the hopes of those dreamers to have been tempered by fears of “supersize” or similar drawbacks.

Various methods of simulating wave kinematics on the structural members of 100-year responses

2017 ◽  
Vol 11 (4) ◽  
pp. 3256-3273
Author(s):  
M.K. Abu Husain ◽  
◽  
N.I. Mohd Zaki ◽  
G. Najafian ◽  
◽  
...  
Keyword(s):  
Structural Members ◽  
Wave Kinematics

Prestress Losses and Camber Growth in Wing-Shaped Structural Members

PCI Journal ◽  
2015 ◽  
Vol 60 (1) ◽  
Author(s):  
Marco Breccolotti ◽  
Annibale L. Materazzi
Keyword(s):  
Structural Members ◽  
Prestress Losses

ANALISIS PENGARUH PEMBANGUNAN JALAN LAYANG JANTI TERHADAP PERKEMBANGAN TATA RUANG KAWASAN JANTI STUDI KASUS : KAWASAN JANTI, DESA CATURTUNGGAL, KABUPATEN SLEMAN, D. I. YOGYAKARTA

2017 ◽  
Vol 11 (3) ◽  
pp. 255
Author(s):  
Jeky El Boru
Keyword(s):  
Road Network ◽  
Open Space ◽  
Qualitative Description ◽  
Analysis Method ◽  
Open Spaces ◽  
The Road ◽  
Before And After ◽  
Linkage Method ◽  
The Impact ◽  
Parking Place

Abstract: This research aims to analyze the impact of Janti Flyover Construction toward the growth of layout at Janti Urban Area, including structured space, open space, and linkage. Method used for data collecting are observation, air photograph monitoring, and interview, whereas the analysis method is qualitative description, which is the superimposed method of two layers, that are the layout condition before and after flyover construction. The result shows that the impact of Janti Flyover construction can be seen on building mass (solid), the increasing number of open spaces, including the road network, parking place, and park, whereas the relation between spaces, visually and structurally, can be seen on the growth of buildings which have new shapes and styles, therefore the performance of the overall building does not have a proportional shape. Considering Janti Street at the collective relation, its role is getting stronger as the main frame road network.Keywords: Flyover construction, layout changing, Janti AreaAbstrak: Penelitian ini bertujuan untuk menganalisis pengaruh pembangunan Jalan Layang Janti terhadap perkembangan tata ruang Kawasan Janti, meliputi ruang terbangun, ruang terbuka, serta hubungan antar ruang (“linkage”). Metode pengumpulan data dilakukan melalui observasi, pengamatan foto udara, dan wawancara; sedangkan metode analisis melalui deskripsi secara kualitatif yang berupa “superimposed method” dari dua lapisan kondisi lahan, yakni kondisi tata ruang sebelum dan sesudah pembangunan jalan layang. Hasil penelitian menunjukkan bahwa pengaruh pembangunan Jalan Layang Janti terdapat pada massa bangunan (“solid”), pertambahan ruang terbuka yang berupa jaringan jalan, parkir, dan taman; sedangkan pada hubungan antar ruang ̶ secara visual dan struktural ̶ yakni tumbuhnya bangunan dengan bentuk dan gaya baru, sehingga bentuk tampilan bangunan secara keseluruhan tidak proporsional. Pada hubungan kolektif, Jalan Janti semakin kuat perannya sebagai kerangka utama jaringan jalan.Kata kunci : Pembangunan jalan layang, tata ruang, Kawasan Janti

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