Similitude Modeling of Structural Damage by Fire

基于火灾特性和火灾对结构的影响，提出了无因次建模参数，以建立物理比例模型来模拟和预测全尺寸结构在火灾中的行为。实验将在三个尺度上进行，以验证和评估尺度的准确性。火灾和结构倒塌的研究框架钢结构的一个隔间受到全面参与火灾。这项研究的动机是世界贸易中心大楼因火灾和飞机损坏而倒塌。考虑到比例模型方法的适当精度，可以证明世贸中心倒塌是一种有效的建模策略。该方法在世贸中心的设计和研究中具有一定的价值。这是一个火灾与结构工程之间的跨学科方案。这两门学科通常不互相抵触。然而，建筑物的防火性是基于这两种做法的输入。无可否认，世贸中心大楼的建造没有直接考虑实际的火灾效果，而不是法规中的要求。没有明确的防火设计。如何才能更好地做到这一点？比例模型提供了一个可行的，也许比计算机模拟更准确的方法。比例建模是一种科学的方法，但它应该得到验证。即使没有完全成功，结果也可以帮助验证计算建模。火灾尺度可以作为计算结构建模的输入，并且可以用于验证计算火灾模型。这是第一次将火灾和结构破坏尺度试验完全结合起来考虑。如果成功，这种缩放将有助于理解火灾中的结构行为。社会将受益于更安全、更可靠的建筑。

Similitude Modeling of Structural Damage by Fire 0301643PI: James Quintiere, University of Maryland Dimensionless modeling parameters are presented in order to develop physical scale models to emulate and predict the behavior of full-scale structures in fire with respect to their fire characteristics and the effect of fire on the structure. Experiments will be conducted at three scales to validate and assess the accuracy of the scaling. Fire and structural collapse will be studied for a frame steel construction of a compartment subject to a fully involved fire. The motivation of the study is the collapse of the World Trade Center towers due to fire and aircraft damage. Given appropriate accuracy of the scale model approach, the WTC collapse can be demonstrated to be a valid modeling strategy. The scaling approach has value in design and investigation as the WTC. This is an interdisciplinary proposal between fire and structural engineering. These two disciplines do not normally converse. Yet the fire resistance of buildings has been based on input from both practices. Admittedly, the WTC buildings were constructed with no direct consideration of the actual fire effect other than the requirement in the regulation. No design for fire was explicit. How can this better be done? Scale modeling offers a viable, and perhaps a more accurate approach than computer simulations. Scale modeling is a scientific approach, but it should be validated. Even with no complete success, the results can aid in validating computational modeling. The fire scaling can be an input to computational structural modeling, and can serve to validate computational fire models. This proposal is the first time a complete combination of the fire and structural failure scaled experiment is considered. If successful such scaling will aid in the understanding of structural behavior in fire. Society will benefit from having safer and more reliable buildings.