Strength calculation and analysis of character of concrete under compression-tension tension-tension condition

In this text,we analysize the character of concrete under compression tension,tension tension condition.In order to simplify the nonlinear analysis of reinforced concrete,we make a new study on strength criterion for concrete under compression tension,tension tension condition,and we also put forward more simple and accurate practical calculation equations.The results from the present equations agree well with the various test data and curies.