Collaborative Research: Dynamic Disproportionate Collapse in Flat-Plate Buildings

这项合作研究的目标是提供急需的实验数据和有效的建模方法，为旧钢筋混凝土平板建筑，通常用于大型住宅和办公综合体的不成比例的倒塌分析。将进行实验和分析研究，以检查这种平板结构在极端荷载事件期间突然失去柱的情况下的性能。试验将在静力和动力荷载作用下对侧向约束板柱连接进行，并在突然荷载释放下对多个板进行试验。试验将为确定分析建模所需的关键参数提供数据，以确定平板系统的局部强度和变形能力，并研究板柱连接的冲切后行为。将采用有限元模拟来促进实验设计，确定局部变形要求，定义失效传播特性，并检查实验中未考虑的其他设计参数的影响。还将开发简化的分析工具，用于快速评估平板建筑物的连续倒塌复原力，而无需进行详细的有限元分析。该项目的研究将导致改进设计准则，以确保在极端荷载事件下更安全的平板建筑。从这项研究中获得的数据也将有助于发展适当的修复方法的平板结构，容易不成比例的崩溃。研究结果将通过出版物、演示文稿和为该项目创建的网站传播给结构工程界。高中生和本科生将参与这个项目，以提高他们对工程的研究兴趣。研究成果将被整合到与板结构相关的研究生课程中，该项目将通过参与项目研究活动为研究生提供高级培训。

The goal of this collaborative research is to provide much needed experimental data and effective modeling approaches for the disproportionate collapse analysis of older reinforced concrete flat-plate buildings that are commonly used for large residential and office complexes. Experimental and analytical studies will be conducted to examine the performance of such flat-plate structures under the scenario of a sudden loss of a column during an extreme loading event. The experiments will be performed on laterally restrained slab-column connections under static and dynamic loading and multi-panel specimens subjected to sudden load release. The tests will be conducted to provide data to define key parameters needed for analytical modeling, to identify the local strength and deformation capacity of the flat-plate systems, and to study the post-punching behavior of slab-column connections. Finite element simulations will be employed to facilitate the design of experiments, to determine local deformation demands, to define failure propagation characteristics, and to examine the effects of other design parameters not considered in the experiments. Simplified analytical tools will also be developed for quick evaluation of the progressive collapse resilience of flat-plate buildings without conducting a detailed finite element analysis. The research in this project will lead to improved design guidelines for safer flat-plate buildings under extreme loading events. The data obtained from this study will also help in the development of appropriate rehabilitation approaches for flat-plate structures that are vulnerable to disproportionate collapse. Research findings will be disseminated to the structural engineering community through publications, presentations, and websites created for this project. High school students and undergraduate students will be engaged in this project to enhance their research interests in engineering. Research results will be integrated into the graduate level courses related to slab structures, and the project will provide advanced training to graduate student through their involvement in the project research activities.