Structures Under Shock and Impact XV最新文献

BLAST EFFECTS AND DAMAGE CHARACTERIZATION ON REINFORCED MASONRY WALLS AT FULL-SCALE 全尺寸加筋石砌筑墙的爆破效应及损伤特征

Structures Under Shock and Impact XV Pub Date : 2018-06-04 DOI: 10.2495/SUSI180111

M. Chiquito, L. M. López, R. Castedo, Anastasio P. Santos, A. Pérez-Caldentey

{"title":"BLAST EFFECTS AND DAMAGE CHARACTERIZATION ON REINFORCED MASONRY WALLS AT FULL-SCALE","authors":"M. Chiquito, L. M. López, R. Castedo, Anastasio P. Santos, A. Pérez-Caldentey","doi":"10.2495/SUSI180111","DOIUrl":"https://doi.org/10.2495/SUSI180111","url":null,"abstract":"It is of a great importance to find out materials that improve the response of different structural elements against a blast event. While there are many works about reinforcing structures, there are a reduce number of them that presents blast test at full-scale. The aim of this work is the comparison of different constructive solutions that are candidates to improve the integrity of brick masonry walls against moderate explosions. This kind of constructive elements produce in many cases, when structure does not collapse, more casualties due to spalling phenomena. A total number of 16 walls were performed at full-scale (measuring 2.5 m length, 2.5 m width and 240 mm of thickness) for this purpose. Charge for the tests ranged from 18 to 38 kg TNT Equivalent and was located at 5 m from the target. The scaled distance was selected so the damage on the wall was intermediate (in the halfway between collapse and little cracks) in order to detect differences among the solutions tested. Three alternatives of reinforcement have been developed: a fibered mortar, a recycled carbon fibre mesh impregnated with a semi-fluid epoxy adhesive and a polymer primed glass fibre mesh applied with a water and polyurethane-based adhesive. The blast event has been characterized using pressure gauges, accelerometers, high-speed camera and a laser-scanner. The resulting damage has been evaluated on both wall faces trough 20 defined points using a rebound hammer. Damage maps has been drawn for each wall doing an interpolation on 200 points. The damage has also been evaluated on terms of spalling, which is the mass of fragments launched during the test. According with the results, reinforcement influences the response significantly.","PeriodicalId":196151,"journal":{"name":"Structures Under Shock and Impact XV","volume":"79 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-06-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121117143","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

REWORKING A SIMPLE MODEL FOR DEFORMABLE PROJECTILE PENETRATION INTO THICK TARGETS 对变形弹丸侵彻厚目标的简单模型进行了改进

Structures Under Shock and Impact XV Pub Date : 2018-06-04 DOI: 10.2495/SUSI180021

S. Syngellakis

{"title":"REWORKING A SIMPLE MODEL FOR DEFORMABLE PROJECTILE PENETRATION INTO THICK TARGETS","authors":"S. Syngellakis","doi":"10.2495/SUSI180021","DOIUrl":"https://doi.org/10.2495/SUSI180021","url":null,"abstract":"Target penetration by deformable projectiles is considered in the context of an established onedimensional theory based on the fundamental balance laws of continuum mechanics. The paper critically reviews the assumptions of this simple analytical model and discusses the material characteristics that influence resistance to penetration. A novel representation of the resisting force is introduced into the original analysis leading to the evaluation of the crater size in addition to other critical output such as depth of penetration and the time history of the impact force over a relevant range of impact energies. An algorithm for a time step integration of the resulting system of differential equations is proposed; this is numerically implemented through a FORTRAN code whose effectiveness and reliability are tested against experimental data from the technical literature. This comparison leads to rational and consistent estimates for the empirical factors adopted in the simplified modelling. The time histories of impulse provided by the computer implemented analysis can be used for the assessment of the effect of the transmitted shock on the supporting structure and its appendices.","PeriodicalId":196151,"journal":{"name":"Structures Under Shock and Impact XV","volume":"27 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-06-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131096558","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

QUANTIFYING THE RESPONSE OF STEEL COLUMNS TO MULTI-AXIS LONG-DURATION BLAST AND THERMAL LOADING 钢柱在多轴长时间爆破和热载荷作用下的响应量化

Structures Under Shock and Impact XV Pub Date : 2018-06-04 DOI: 10.2495/SUSI180081

L. Mcfadzean, S. Clubley

{"title":"QUANTIFYING THE RESPONSE OF STEEL COLUMNS TO MULTI-AXIS LONG-DURATION BLAST AND THERMAL LOADING","authors":"L. Mcfadzean, S. Clubley","doi":"10.2495/SUSI180081","DOIUrl":"https://doi.org/10.2495/SUSI180081","url":null,"abstract":"Columns are an integral part of a steel framed structure, responsible for carrying load to the foundations. If the integrity of a column is compromised due to damage, such as from blast, incipient partial or total collapse of a structure can occur. The response of a column to blast can increase for a number of reasons e.g. the blast is long-duration in nature, where long-duration is defined as the positive duration in excess of 100ms, the blast arrives at an oblique angle of incidence or the column is also subject to a thermal load. While the effects of each have been considered separately, there is no research on the response to a combination. This paper reports on the effect of multi-axis long-duration thermal and blast loading on the response of a steel column. Numerical modelling was used to determine the blast load and the structural response of the column. The results show that column response to multi-axis and thermal loading individually increases due to a combination of projected area, weak axis and shielding effects and thermal softening respectively. Additionally, the response is increased further when multi-axis and thermal loading are considered together.","PeriodicalId":196151,"journal":{"name":"Structures Under Shock and Impact XV","volume":"15 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-06-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126268974","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

EXPERIMENTAL TESTS ON PERSONAL SAFETY DEVICES FOR FALLS FROM HEIGHT 高空坠落人身安全装置的试验试验

Structures Under Shock and Impact XV Pub Date : 2018-06-04 DOI: 10.2495/SUSI180071

J. C. P. Torres, E. Carrión, R. I. Más, Antonio González Sánchez, Enrique-Gonzalo Segovia-Eulogio

引用次数: 2

EXPERIMENTAL ANALYSIS ON REDUCED-SCALE PROTECTIVE DOORS 缩小尺寸防护门的实验分析

Structures Under Shock and Impact XV Pub Date : 2018-06-04 DOI: 10.2495/SUSI180101

C. Baciu, M. Lupoae, D. Constantin

{"title":"EXPERIMENTAL ANALYSIS ON REDUCED-SCALE PROTECTIVE DOORS","authors":"C. Baciu, M. Lupoae, D. Constantin","doi":"10.2495/SUSI180101","DOIUrl":"https://doi.org/10.2495/SUSI180101","url":null,"abstract":"Terrorist events that occurred in the last years changes the global security policy, imposing additional safety measures for building design. Therefore, the protection of access routes should be considered by using protective doors to resist to impact and explosions effects. This paper presents a thorough analysis on establishing a proper configuration to ensure a minimum level of blast protection for metallic doors used for government and military buildings. The analysis includes experimental tests and numerical analysis performed on a 1/3 scale model. Seven different sandwich-type configurations were tested according to specific requirements of actual standards. Each door was successively mounted on a metallic frame, horizontally placed, and a spherical plastic explosive charge, at a standoff distance of 35 cm, was detonated. The deformations were measured on each side of the door, offering the valuable data of their strength capacity and also of the dissipation energy level. The door with a honeycomb interior configuration resulted to be the optimal solution. The numerical results showed a good correlation with numerical ones, permitting the further development of a full-scale model.","PeriodicalId":196151,"journal":{"name":"Structures Under Shock and Impact XV","volume":"5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-06-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134645264","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

INVESTIGATION OF LOCAL BEHAVIOR BY IMPACT OF PROJECTILE FOR REINFORCED CONCRETE PANELS 钢筋混凝土板受弹丸冲击的局部性能研究

Structures Under Shock and Impact XV Pub Date : 2018-06-04 DOI: 10.2495/SUSI180161

Chunghyeon Kim, Jae-Yeol Cho

{"title":"INVESTIGATION OF LOCAL BEHAVIOR BY IMPACT OF PROJECTILE FOR REINFORCED CONCRETE PANELS","authors":"Chunghyeon Kim, Jae-Yeol Cho","doi":"10.2495/SUSI180161","DOIUrl":"https://doi.org/10.2495/SUSI180161","url":null,"abstract":"Local behavior is generated by the impact of a projectile within a proximal area from the position of the impact, and consists of penetration of the projectile into the structure, perforation of the projectile, scabbing of the structural material, etc. A protective structure like a containment wall of a nuclear power plant should prevent local behavior by the impact of a projectile from causing internal damage to the protective structure, so accurate evaluation of the local behavior is necessary. For evaluation of the local behavior, evaluation of the penetration behavior is a priority because the penetration is primary local behavior affecting the mechanism of perforation, scabbing. In this study, impact tests were performed with reinforced concrete panels and a hard projectile to evaluate the penetration behavior of a concrete structure, test results were discussed, and an empirical formula for prediction of penetration depth was evaluated by using the formula form suggested by Forrestal. The conclusion of this study is that the effect of deflection of RC panels on the penetration depth by the impact of a projectile can be neglected for tested conditions and the evaluated prediction formula of penetration depth generally shows good agreement with the test results.","PeriodicalId":196151,"journal":{"name":"Structures Under Shock and Impact XV","volume":"57 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-06-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122986392","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

ANALYSIS OF EFFECT OF MOMENTUM ON THE BEHAVIOR OF RC BEAMS UNDER LOW VELOCITY IMPACT LOADING 动量对低速冲击荷载下rc梁性能的影响分析

Structures Under Shock and Impact XV Pub Date : 2018-06-04 DOI: 10.2495/SUSI180141

Y. Yu, Jae-Yeol Cho

{"title":"ANALYSIS OF EFFECT OF MOMENTUM ON THE BEHAVIOR OF RC BEAMS UNDER LOW VELOCITY IMPACT LOADING","authors":"Y. Yu, Jae-Yeol Cho","doi":"10.2495/SUSI180141","DOIUrl":"https://doi.org/10.2495/SUSI180141","url":null,"abstract":"Recently, the demand for structural safety under impact loading has been increased because the risk of exposure to the infrastructure to impact loading increases. The behavior of the structures under impact loading is a very complex phenomenon. For this reason, it is required to develop a rational method to estimate the impact resistance of structures. Some researchers have suggested performance based design method to do this. They conducted drop weight impact test and proposed empirical equations for evaluating the impact resistance. However, these equations were derived from small impact energy range. In addition, these equations did not consider the effect of the momentum of drop weight and only reflected the impact energy of drop weight. There are various combinations of mass and impact velocity of drop weight having the same impact energy. Thus, it is also necessary to consider the momentum of the drop weight. In this study, the effect of the momentum of drop weight is assessed through finite element analysis using LS-DYNA program. From this analysis, it was confirmed that the behaviors of RC beams such as maximum deflection and failure mode are related to the combination. These results imply that the design of concrete structures subjected to impact loading should consider the momentum, that is, a combination of mass and impact velocity.","PeriodicalId":196151,"journal":{"name":"Structures Under Shock and Impact XV","volume":"17 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-06-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123940531","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

BALLISTIC PERFORMANCE OF ENHANCED CROSS-LAMINATED TIMBER (ECLT) 增强交叉层压木材(eclt)的弹道性能

Structures Under Shock and Impact XV Pub Date : 2018-06-04 DOI: 10.2495/SUSI180241

Kathryn Sanborn, B. Riser, R. Gentry, L. Stewart

{"title":"BALLISTIC PERFORMANCE OF ENHANCED CROSS-LAMINATED TIMBER (ECLT)","authors":"Kathryn Sanborn, B. Riser, R. Gentry, L. Stewart","doi":"10.2495/SUSI180241","DOIUrl":"https://doi.org/10.2495/SUSI180241","url":null,"abstract":"Over the past 60 years, the materials traditionally used to construct temporary military structures have become less effective in operational theaters that require greater force protection from ballistic and blast events. Cross-laminated timber (CLT), an engineered wood product that has recently grown in popularity due to its strength and ease of assembly, has the potential to serve as an alternate or replacement building material. However, its viability for use in temporary military structures not only depends on its well-documented performance under normal design loads, but also its less-understood performance under ballistics and blast loading conditions. To better characterize CLT under such conditions in the absence of historical data, a series of ballistic experiments were conducted at the United States Army Engineer Research and Development Center (ERDC) to measure the penetration depth or residual velocity of munitions fired at various velocities. Based on the 152 initial ballistic experiments, new enhanced cross-laminated timber (ECLT) samples were developed using known armor materials and evaluated in terms of constructability and ballistic performance. During construction, heavy plate armor was significantly less compatible in bonding with CLT configurations and in some cases required mechanical connections, whereas the more fibrous materials developed for use in lightweight armor bonded well to the CLT with an epoxy mixture. The most promising ballistic performances came from the ECLT samples using flexible fibrous materials. In general, the testing showed that increased ballistic performance is attainable by enhancing CLT, but such improvements have consequences such as increased weight or material cost. Therefore, compromise on acceptable protection levels during the design process using cost-benefit analysis is necessary. Ultimately, ECLT samples modified with fiberglass fabric showed greatest cost-benefit potential.","PeriodicalId":196151,"journal":{"name":"Structures Under Shock and Impact XV","volume":"23 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-06-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116046910","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

BLAST TESTING OF ENERGY ABSORBING CONNECTORS FOR BLAST RESISTANT DESIGN 抗爆炸设计用吸能接头的爆炸试验

Structures Under Shock and Impact XV Pub Date : 2018-06-04 DOI: 10.2495/SUSI180061

C. Oswald

引用次数: 0

SENSITIVITY STUDY OF AIRPLANE IMPACT ON AN UNDERGROUND RADIOACTIVE WASTE-STORAGE BUILDING 飞机撞击地下放射性废物贮存建筑的敏感性研究

Structures Under Shock and Impact XV Pub Date : 2018-06-04 DOI: 10.2495/SUSI180131

A. Nykyforchyn, Milko Miloshev, M. Kostov, J. Klügel

{"title":"SENSITIVITY STUDY OF AIRPLANE IMPACT ON AN UNDERGROUND RADIOACTIVE WASTE-STORAGE BUILDING","authors":"A. Nykyforchyn, Milko Miloshev, M. Kostov, J. Klügel","doi":"10.2495/SUSI180131","DOIUrl":"https://doi.org/10.2495/SUSI180131","url":null,"abstract":"A hypothetical crash of a military aircraft F-4 onto an underground radioactive waste storage was studied. The primary objective was to evaluate the amount of fuel that could penetrate the roof of the building. The dynamic analyses of the impact of the airplane on the RC roof slab covered with asphalt concrete layer were performed with an integral simulation approach. The finite element model of the airplane includes detailed modelling of fuselage, wings, engine and non-structural parts. Fuel is modelled as SPH particles, which allows evaluation of the fuel dispersion and penetration. Sensitivity of the concrete roof damage and fuel penetration on various model and impact parameters is extensively studied. Different material models of concrete, asphalt concrete and aluminium airplane structure were investigated. The effect of the impact location, velocity and angle was studied. The comparison of the analyses with different input parameters showed different sensitivity of the damage degree of the building and the amount of the penetrated fuel. The impact location and the material modelling of the reinforced concrete and airplane structure have a relatively small effect on the fuel penetration. The amount of the penetrated fuel depend strongly on the impact velocity and impact angle. Incorporation of the asphalt concrete layer in the structural model has also a significant impact on the roof damage and the fuel penetration.","PeriodicalId":196151,"journal":{"name":"Structures Under Shock and Impact XV","volume":"53 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-06-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127585257","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0