Entity

Time filter

Source Type


Liu C.-L.,Tongji University | Liu C.-L.,K and C Protective Technologies Pte. Ltd. | Li G.-Q.,Tongji University | Chen H.-H.,Hunan University | And 3 more authors.
Advances in Structural Engineering | Year: 2015

The purpose of this study is to develop mitigation systems suitable for use in preventing casualties and injury due to glass window and glass façade failure in public facilities, such as mass transportation terminals, government, sport arenas or hotel buildings, etc. A series of air-blast tests are conducted to validate the blast resistance of laminated glazing system of new elastomeric urethane interlayers. The tests are conducted in a shock tube capable of achieving reflective impulses up to 250 psi-msec which does not have negative phase contribution to the mitigation system performance. Two aspects of mitigation systems are examined, blast resistant glazing utilizing a new elastomeric urethane interlayer and attachment methods. The attachment systems vary in order to determine the influence of deflection and ductility that yields the best results of reducing the loading to the structural elements. Source


Liu C.-L.,Tsinghua University | Liu C.-L.,K and C Protective Technologies Pte. Ltd. | Palermo D.,Transparent Armor and Specialty Products | Lok T.S.,Nanyang Technological University
10th International Conference on Shock and Impact Loads on Structures 2013 | Year: 2013

The purpose of this study was to develop mitigation systems suitable for use in preventing casualties and injury due to glass window and glass curtain failure in public facilities, such as mass transportation buildings, government, sports or hotel buildings, etc. A series of air-blast tests has been conducted to validate the blast resistance of laminated glazing system with the elastomeric urethane interlayers. The tests were conducted in a shock tube capable of achieving reflective impulse values of 250psi-msec with no negative phase contribution to the mitigation system performance. Two aspects of mitigation systems were examined, blast resistant glazing and attachment methods. Attachment systems will vary in order to determine the combination of deflection and ductility that yields the best results with minimal loading to the structural elements. Source


Liu C.-L.,Tsinghua University | Liu C.-L.,K and C Protective Technologies Pte. Ltd. | Lok T.S.,Nanyang Technological University | Palermo D.,Transparent Armor and Specialty Products | Tan C.K.,K and C Protective Technologies Pte. Ltd.
10th International Conference on Shock and Impact Loads on Structures 2013 | Year: 2013

Security threats faced by the water-supply chain of facilities are presented. The threats include deliberate physical disruption to any part of the supply-chain to the complete destruction of vital pump equipment and introduction of chemicals into the water. The concept of Security and Protective Design is introduced in this paper. The most important concept is the introduction of appropriate assessment of threats and counter-measure recommendations, including redundancy design and engaging extra capacity to reduce the overall consequences of costly repair and replacement. The main benefit of incorporating Security and Protective Design is that the systems in the facility can continue to maintain the basic operation to fulfill the minimum requirements of water delivery for human survival and industrial function. In addition, the paper considers the effect on costs. It is highly likely that the total repair cost can be greatly reduced with the built-in redundancy. This savings can be achieved by avoiding costly demolition and rebuilding of the damaged system. This paper provides an assessment of the security and protective design of systems to minimise disruption and provides some valuable insights into potential consequences if steps are not taken to safeguard our only life-saving resource. Source


Zhou J.,East China Architectural Design and Research Institute Co. | Chen S.,State Key Laboratory for Disaster Reduction in Civil Engineering | Su J.,East China Architectural Design and Research Institute Co. | Li G.,State Key Laboratory for Disaster Reduction in Civil Engineering | And 5 more authors.
Jianzhu Jiegou Xuebao/Journal of Building Structures | Year: 2010

To reduce the potential of structural progressive collapse due to local member failure, progressive collapse analysis was carried out for the B3 structure in the East Communication Plaza of Hongqiao Junction. Three cases of single-column failure and one case of double-columns failure were analyzed employing alternative path method according to the requirements of UFC-023-03. From nonlinear dynamic analysis results, this frame structure is locally damaged for single-column failure cases but the damage is confined within the limited area around the removed member. For the double-columns failure case, the damaged area is obviously increased but is still confined in a limited area and won't induce the whole structure's progressive collapse. Source


Liu C.,K and C Protective Technologies Pte. Ltd. | Liu C.,Tsinghua University
Proceedings of the 9th International Conference on Shock and Impact Loads on Structures | Year: 2011

Protective designs for structures against explosive events, accidental or intentional, have evolved over the past five years. New technologies have made blast mitigation easier with fewer aesthetic compromises as compared to the use of conventional materials like concrete and steel. The use of these conventional materials commonly adds considerable mass to the building envelope and presents a "bunker-like" look and feel. In new construction, such disadvantages can be reduced by the use of high mass materials and by addressing the esthetical concerns with clever architectural designs. However, in retrofit applications using concrete and steel while maintaining architectural aesthetics is difficult. While the requirements for protecting occupants and assets inside a building are steadily being updated internationally, I wish to share my views on the three components which I feel are essential to the successful implementation of protective measures in retrofit applications. First is the engineering consultants' knowledge and ability to characterize as well as validate materials and technologies. Second is the protective design that is specifically engineered to mitigate an assessed threat against a particular structure. Third is the knowledge and capability of the installing contractor, not only to execute the engineered designs but also to overcome challenges in the actual construction of the building. In this paper, I intend to give some insights of the three components mentioned above, and also to address an additional aspect, i.e. the after-installation requirements of maintenance. Very often these four components are completed independent of each other, whether due to contracting processes, or the concern over conflict of interests, or the time gap between a threat assessment is done and the tender for installation of protective design is called. In my opinion, a Design-Build-Maintain approach is the best to ensure optimum results of protective designs in protecting structures and building envelopes against explosive blast loads. Source

Discover hidden collaborations