Glass plays an important role in many engineering applications including transparent armor. Determining the actual strength of a glass is problematic because typical glass strength numbers are presented in the literature as ranges. Minor changes in surface finish, composition, test method employed, and processing all influence the mechanical strength of glass. A standardized method needs to be utilized to ensure that strength data can be compared universally. The use of a standard methodology is vital when comparing glass compositions or multiple sample lots of the same composition in order to attribute any real strength variations to the glass itself. While the procedures established in ASTM C1499 provide a good framework for glass strength measurement, flexibility in the experimental parameters of the standard allow for substantial strength variations when testing glass materials. The ratio between the load and support ring diameters, as well as the specimen dimensions, is shown to lead to variations in both the measured strength, as well as the number of valid/invalid tests based on where fracture initiates. The goal of this study is to quantify these effects in order to establish optimized testing conditions for determining the strength of float glass.
A two‐dimensional macroelement is proposed for reinforced concrete interior beam‐column joints based on an innovative theory of joint shear hinging failure. The new joint model maintains the original aspect of the mechanical model of the joint shear hinging failure theory, in which concrete struts are used to model the concrete core, which differs from other multispring models discussed in the literature and developed from the theory. The applicable scope of the new joint element encompasses interior joints where the beams and columns have the same depth and width. Moreover, within the scope of this study, only the monotonic responses were computed to capture the backbone of the joint hysteresis responses. Verification of the test data indicated the reliability of the new joint models for predicting the backbone of the load‐deflection relationship and the yielding of reinforcements under cyclic loadings.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.