To exert the strength of the reinforcing bar when the member broken,puts forward a means in measurement of the minimum span length of simple flexural member.

Extension on determining the problem of minimum spanning distance between two rollers of conjugate cam mechanism;

Via a thorough considering of the structural types-F and P, A sollution to the minimum spanning distance of equidiameter earn mechanism is offered.

Via considering two earn mechanisms in its entirety-the type F and type P,this paper researches and solves the minimum spanning distance problem of translating follower plane conjugate earn mechanisms.

The minimal span ratio in the range of the plane-section assumption in the elasticity analysis of L-shaped RC columns with different loading cases is pr.

In accordance with The Code for Designing Concrete Structures and based on the formula for calculating maximum crack width, some formulas for computing minimum span-height ratio of beams that can do without crack width checking computations are derived which are of reference value to section designing.

This paper respectively analyses and describes the disease causes of old aged reinforced concrete girder and the girder replaced in 1980, proposes the treatment measures for the disease based on the investigated situation of small-span bridge on shenyang-shanhaiguan railway line,for reference to maintenance of similar bridge.