RESIlient buildings using STainless steel (RESIST)

使用不锈钢的弹性建筑 (RESIST)

• 批准号: EP/W019655/1
• 负责人: Leroy Gardner
• 金额: $ 63.75万
• 依托单位: Imperial College London
• 依托单位国家: 英国
• 项目类别: Research Grant
• 财政年份: 2022
• 资助国家: 英国
• 起止时间: 2022 至 无数据
• 项目状态: 未结题
• 来源: https://gtr.ukri.org/projects?ref=EP%2FW019655%2F1
• 关键词: RESIlient; buildings; using; STainless; steel

Key to the survival of a building subjected to extreme loads, such as fire, blast and impact is the provision of a robust structural frame, which can accommodate the resulting high strength and ductility demands. To this end, the performance of the beam-to-column joints is paramount, since these will be subjected to high rotation capacity demands and high tying forces, as they are required to facilitate catenary action and provide an alternative load path in the case of a sudden failure of a supporting column. The fundamental hypothesis underpinning this research project is that replacing the carbon steel components in critical parts of the joints (e.g. bolts, angle cleats, plates) with an appropriate grade of stainless steel, which has greater ductility, as well as better fire behaviour, will enhance the joint strength and ductility thus maximizing the resistance to a progressive collapse during an extreme event such as an impact, blast or fire.The project consists of 4 technical work packages with a fifth one dedicated to impact and dissemination, as outlined hereafter:WP 1 focuses on the behaviour of joints under impact loading. Stainless steel plate, bolt and weld material coupons will be tested under high strain rates to determine the material response under conditions brought about by impact loading. The obtained results will be utilised to calibrate material models explicitly accounting for strain rate sensitivity as well as fracture models considering the effect of strain rate and stress triaxiality. Furthermore, lap joints and T-stubs will be tested at high strain rates and FE models will be developed and utilised in parametric studiesWP2 studies the behaviour of material and connections at and after exposure to high temperatures ranging from 20 to 1000 degrees centigrade. Isothermal and anisothermal material coupon tests will be conducted on plate, weld and bolt material, whilst for the post fire condition, both air cooling and quenching will be considered. Upon determining the effect of temperature on material response, advanced FE models will be developed to establish the performance of double web cleat, top and seat angle cleat and extended endplate joints under and post fire conditions.WP3 investigates the behaviour of individual joints under moment and shear and double sided joints under moment, shear and tension under static and dynamic loading conditions. Both physical tests and numerical models (utilising the findings of WP1) will be generated to characterise the joint response under realistic column loss scenarios. Supplementary numerical studies on geometrically identical conventional steel joints will also be conducted to compare the performance of the novel hybrid carbon/stainless steel and conventional steel joints.WP4 will utilise all previous WPs to develop and calibrate spring joint models suitable for incorporation into FE simulations of frames using beam elements. Using OpenSees, low-, medium- and high-rise 3D steel frames employing the novel hybrid joints as well as conventional ones will be analysed under a variety of extreme hazard scenaria including impact and fire using a probabilistic approach for the variability in material, geometry and loading. The obtained results will be utilised to determine the probability of failure and derive analytical fragility curves and quantify the effect of the adoption of the novel connections on the survivability of steel framed structures. Finally, WP5 will utilise all previous WPs to develop and disseminate design guidance to maximise the impact of the research. The close collaboration with leading consultants and strong links with BSI, as well as the applicants' close familiarity and involvement with Eurocode 3 will guarantee prompt dissemination of the research findings to the relevant practices, institutions and code development bodies.

建筑物受到极端负荷（例如火灾，爆炸和撞击）的生存的关键是提供坚固的结构框架，可以满足所得的高强度和延展性需求。为此，梁到柱接头的性能至关重要，因为这些将受到高旋转能力需求和高绑扎力的影响，因为它们需要促进链纳式动作，并在支持柱突然失败的情况下提供了另一种载荷路径。基于该研究项目的基本假设是，用适当等级的不锈钢替换关节的关键部位（例如螺栓，角度的防滑钉，板块）中的碳钢成分，具有更大的延展性，具有更大的延展性，以及更好的火力行为，将增强爆炸的爆发，从而在爆炸中提高爆炸，以至于造成爆炸的爆炸，例如，在一项进步的爆炸中，造成了极端的效果，例如，在某种程度上造成了极端的影响，例如，造成了极端的效果。如下所述：WP 1的包装专用于撞击和传播的第五个包装侧重于撞击负荷下的关节行为。不锈钢板，螺栓和焊接材料优惠券将在高应变速率下进行测试，以确定撞击负荷带来的条件下的材料响应。所获得的结果将用于校准材料模型，以明确考虑应变率敏感性以及考虑应变率和应力三轴性影响的断裂模型。此外，将以高应变速率测试圈接头和T型容器，并将Fe模型用于参数研究中，并在暴露于20至1000摄氏度的高温范围内和接触高温时的材料和连接的行为。等温材料和Anisother材料优惠券测试将在板，焊接和螺栓材料上进行，而在火灾后，将考虑空气冷却和淬火。在确定温度对材料响应的影响后，将开发出高级FE模型，以确定双网防滑钉，顶部和座椅角度防滑钉的性能，以及在火灾下并在火灾后的端板接头以及扩展的终板接头。Wp3研究了在矩和矩和双向关节下的单个关节的行为，在力矩下，在矩和动态载荷条件下，剪切和张力和张力。物理测试和数值模型（利用WP1的发现）都将生成以表征在逼真的列损失方案下的关节响应。还将对几何相同的常规钢接头进行补充数值研究，以比较新型混合碳/不锈钢和常规钢关节的性能。WP4将利用所有以前的WPS开发和校准适合使用光束元素掺入FE模拟中的弹簧关节模型。在各种极端危害的情况下，将使用开放式，低层，中和高层3D钢框架，以及传统的杂交接头以及常规的关节，包括撞击和射击，使用概率方法来实现材料，几何学和载荷的差异。所获得的结果将用于确定故障的可能性并得出分析脆性曲线，并量化新型连接对钢结构结构生存能力的采用的影响。最后，WP5将利用所有以前的WP来开发和传播设计指南，以最大程度地发挥研究的影响。与领先顾问的密切合作和与BSI的紧密联系，以及申请人对Eurocode 3的密切熟悉和参与将确保将研究结果迅速传播给相关实践，机构和代码开发机构。