综述State-of-the-Art Review of Approaches for the Design of Timber Beams with Notches.pdfVIP

State-of-the-Art Review of Approaches for the Design of Timber Beams with Notches 1 2 3 Robert Jockwer ; René Steiger ; and Andrea Frangi . d e v r e s Abstract: Notches are details that significantly reduce the load-carrying capacity of beams made of timber. The amount of reduction was the e r s t subject of investigation in numerous studies from an experimental or theoretical point of view. The singular stress distribution around the notch h g i r corner can be described by equations based on linear elastic fracture mechanics, fracture energy, or complex solutions. From experimental tests, l l a ; simplified equations can be proposed. Standards, codes, and handbooks for the design of timber structures are based on such equations. When y l comparing the dimensions of notched beams tested in experiments with those that are relevant in practical applications, specimens of small n o e dimensions were primarily tested. The application of design approaches verified by tests on specimens of small dimensions and the use of s u l material properties determined from small clear specimens do not account for size effects that are important when working with beams of large a n o s dimensions. The influence of duration of load, moisture variation, and cyclic loading on the fracture of the notch has to be studied. An extension r e p r of tests on notched beams and relevant material properties that are now gained from small clear specimens to those of large dimensions is o F. necessary. DOI: 10.1061/(ASCE)ST.1943-541X.0000838. © 2013 American Society of C