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RISReliability, Brittleness, Covert Understrength Factors, and Fringe Formulas in Concrete Design Codes
Publisher: American Society of Civil Engineers
Abstract: The paper analyzes the reliability consequences of the fact that the current design codes for concrete structure contain covert (or hidden) understrength (or capacity reduction) factors. This prevents distinguishing between ...
Size Effect on Strength of Quasibrittle Structures with Reentrant Corners Symmetrically Loaded in Tension
Publisher: American Society of Civil Engineers
Abstract: The effect of V-notches (or reentrant corners) on fracture propagation has been analyzed for brittle materials, but not for quasibrittle materials such as concrete, marked by a large material characteristic length producing ...
Universal Size Effect Law and Effect of Crack Depth on Quasi-Brittle Structure Strength
Publisher: American Society of Civil Engineers
Abstract: In cohesive fracture of quasi-brittle materials such as concrete, rock, fiber composites, tough ceramics, rigid foams, sea ice, and wood, one can distinguish six simple and easily modeled asymptotic cases: the asymptotic ...
Designing Against Size Effect on Shear Strength of Reinforced Concrete Beams Without Stirrups: II. Verification and Calibration
Publisher: American Society of Civil Engineers
Abstract: After theoretical derivation of the general form of the size effect formula for beam shear in the preceding Part I, this Part II presents experimental verification by least-square fitting of those existing individual data ...
Designing Against Size Effect on Shear Strength of Reinforced Concrete Beams Without Stirrups: I. Formulation
Publisher: American Society of Civil Engineers
Abstract: The shear failure of reinforced concrete beams is a very complex fracture phenomenon for which a purely mathematical approach is not possible at present. However, detailed modeling of the fracture mechanism is not necessary ...
Can Stirrups Suppress Size Effect on Shear Strength of RC Beams?
Publisher: American Society of Civil Engineers
Abstract: This paper demonstrates the size effect on the shear strength of reinforced concrete (RC) beams with stirrups and does so in two separate and independent ways: (1) by fracture mechanics, based on finite-element analysis ...
Size-Effect Testing of Cohesive Fracture Parameters and Nonuniqueness of Work-of-Fracture Method
Publisher: American Society of Civil Engineers
Abstract: The cohesive crack model has been widely accepted as the best compromise for the analysis of fracture of concrete and other quasibrittle materials. The softening stress-separation law of this model is now believed to be ...
A Study of Deformation Mechanism During Nanoindentation Creep in Tin-Based Solder Balls
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: As the shrinkage and integration of devices, the creep behavior of tin-based alloys becomes important with microscales. In this paper, the behavior of creep deformation in solder alloys during ...
Reliability Evaluation on Deterioration of Power Device Using Coupled Electrical-Thermal-Mechanical Analysis
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: This paper presents a simulation method to evaluate the thermal fatigue life of a power module. A coupled electrical-thermal analysis was performed to obtain the nonuniform temperature distribution ...
Hydration of Concrete Containing Hybrid Recycled Demolition Powders
Publisher: American Society of Civil Engineers
Abstract: If not properly managed, the hybrid powders produced during recycling mixed construction and demolition (C&D) materials will present a serious hazard to the environment and human health. Recent studies have found that ...