The biasing pressure vertical stiffness and vertical deformation properties at shear-compression state are studied.

A series of basic concepts, such as origin compression stiffness, origin compression longitudinal elastic modulus, biasing pressure vertical stiffness, etc.

The paper takes a cable-stayed bridge with couple tower,couple cable,three-span prestressed concrete beam and steel truss composite beam for example,analyzes and compares various factors that affect the vertical rigidity of composite beam cable-stayed bridge of double line railway.

The present situation of vertical rigidity tor the existing railway bridges under the action of Zhong-live load as stipulated in the railway design specifications in China and the proportional relationship between various load working conditions and Zhong-live load are analyzed.

The results show that as the vertical rigidity index of bridge exceeds allowance of the design specification,the running quality of vehicle and dynamical behaviour of the bridge are still in good condition.

A Simple method for computing vertical stiffness of rubber bearings;

Using fatigue machine designed by authors, adopting China rubber bearings of 160 mm diameter,this paper studied the changes of the vertical deformation and vertical stiffness of the rubber bearings by vertical fatigue load test of 100 thousands repetition, studied the durability property of rubber bearings.

It is considered with the offset vertical stiffness of bearing isolation in analyzing the earthquake response for the isolated tower structure.

In this paper,a new kind of rail fastener structure with the name of compression shear compound damper is introduced,including the vertical double stiffness,the lateral static stiffness and the influence of vertical preload on lateral stiffness.

Calculation of vertical stiffness matrix of frame structures subjected to vertical earthquake action;