SGER: Progressive Collapse Investigation of an Existing Steel Frame Building

这项探索性研究小额拨款（SGER）项目的主要研究目标是：1)审查和评估当前的渐进倒塌设计标准和指南，2)根据现行规范规定对现有钢框架建筑进行建模和分析，以及3)通过移除三到四个第一层柱进行实验，并调查建筑物随后的倒塌或损坏过程。可用于倒塌测试的实际建筑物非常有限，因此必须抓住这个机会。位于俄亥俄州立大学校园的一座四层钢框架建筑将被建模和分析，以调查其对渐进倒塌的脆弱性。根据现行设计准则和规范标准的建议，一根角柱和几根第一层的周长柱将被切割和移除，随后的结构响应将与计算机模拟预测的结果进行比较。许多研究人员进行了分析研究，以评估当前渐进式倒塌设计指南的有效性和一致性。但是，为了验证这些分析研究的结果和验证准则中规定的方法，进行了非常有限的实验研究。这主要是因为通常很难建造和测试全尺寸的建筑样本，而且这种大规模的测试成本高得令人沮丧。作为实验研究的一部分，将有可能测试一个真正的四层建筑，计划拆除。测试数据将有助于调查当前指南的有效性和有效性，并提供可用于验证崩塌模拟的实际崩塌行为。该研究将产生重大影响，特别是对新的设计和修复和加强抗倒塌的建筑结构。除了提供实际建筑拆除某些承重构件或柱后的试验性能信息外，研究结果可用于预测具有规则平面的类似钢结构建筑的抗倒塌能力。这个实验和分析研究项目的结果可能会影响目前的实践和指导方针，这些指导方针是为建筑物的渐进倒塌评估和设计而制定的。从试验建筑中观察到的倒塌破坏模式将提供当前指南的保守程度的指示。作为分析研究的一部分，测试结果将与模拟的预测响应进行比较。由于实际建筑的倒塌实验数据非常有限或没有，因此研究结果将对结构工程界，包括研究人员和从业人员产生广泛的影响。使用测试结果验证当前简化分析程序的有效性。这也将提供一个特殊的经验，本科生和研究生谁将参与实验。

The main research objectives of this Small Grant for Exploratory Research (SGER) project are to: 1) review and evaluate the current progressive collapse design criteria and guidelines, 2) model and analyze an existing steel frame building following the current code provisions, and 3) conduct an experiment by removing three or four first-story columns and investigate the subsequent collapse or damage progress in the building. The availability of actual buildings that can be tested to collapse is very limited, so it is imperative that this opportunity be taken. A four-story steel frame building located on the Ohio State University campus will be modeled and analyzed to investigate its vulnerability against progressive collapse. As recommended by the current design guidelines and code standards, one corner column and several first-story perimeter columns will be cut and removed, and the ensuing structural response will be compared with that predicted from the computer simulation. Many researchers have conducted analytical studies to evaluate the effectiveness and consistency of the current progressive collapse design guidelines. However, very limited experimental research was performed to validate the results of those analytical studies and to verify the methodologies prescribed in the guidelines. This is mainly because it is usually difficult to construct and test full-scale building specimens and such large-scale testing is discouragingly expensive. As part of the experimental research, it will be possible to test a real four-story building scheduled for demolition. The test data will enable investigation of validity and effectiveness of the current guidelines and provide actual collapse behavior that can be used to validate collapse simulation.The research will have significant impact, specifically on the new design and repair and strengthening of collapse-resistant building structures. In addition to providing much needed information on the experimental behavior of a real building after the removal certain load carrying elements or columns, the research results could be used to predict the collapse resistance of similar steel buildings with regular floor plans. The results from this experimental and analytical research program are likely to impact the current practice and guidelines developed for progressive collapse evaluation and design of buildings. The observed collapse failure mode from the test building will provide an indication of level of conservativeness of the current guidelines. Test results will be compared with the predicted response from simulations as part of the analytical investigation. Since there is very limited or no experimental collapse data from real buildings, the outcome of the research will have broad impacts on the structural engineering community, including researchers and practitioners. The validity of the current simplified analysis procedures will be verified using the test results. This will also provide an exceptional experience for undergraduate and graduate students who will be involved in the experiments.