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In this study, the fracture process of strain softening and hardening material which has the crack dispersion and localization characteristics was studied. Numerical analysis method to calculate the load displacement relationship of the member which has multiple cracking subjected to the bending was proposed based on the fracture mechanics consideration. Bending tests of the fiber reinforced light-weight concrete panel were performed. Influences of the fiber content and the air content on the mechanical properties and on the crack dispersing effect were cleared. Especially, the fiber reinforced light-weight concrete containing air showed high crack dispersion under the bending condition. Tension softening diagram of fiber reinforced light-weight concrete which can be used as a constitutive law for the numerical analysis were evaluated by the data of a load crack mouth opening displacement (CMOD) relationships obtained by the wedge splitting test. The analysis results of the bending tests agreed well with the test results.

FRACTURE MECHANICS BASED BENDING FAILURE ANALYSIS FOR FIBER REINFORCED LIGHT-WEIGHT CONCRETE PANEL CONSIDERlNG CRACK DISPERSION EFFECT