There are three common design methods for steel structures

1. Simple steel structure workshop design

Simple design is one of the traditional methods, is still widely used, assuming that in addition to the nominal torque caused by eccentric joints, there is no moment from one connected component to another component, structure resistance to lateral load and swing usually by support in some of the multi-storey building or by concrete core is to ensure that, for the designer, It is important to recognize assumptions about common response and to ensure that the details of the connection do not adversely affect the performance of the structure. Years of experience have shown that to meet the standard types of detail, designers must use simple structures to refer to standard joint connections.

2. Continuous steel structure design

In a continuous design, joints are assumed to be rigid and transfer torque between members. The stability of a tailgate frame depends on the action of the frame (i.e. bending beams and columns). Continuous designs are more complex than simple designs, so software is commonly used to analyze the frame. In continuous framework, design must consider the actual pattern of load combination, the connection between the components must have different characteristics, depending on the framework design method is flexible and plastic, in the design of elastic, the rotation of the joint must have enough stiffness, to ensure that the frame around the force and moment distribution and calculation of the force and moment distribution of no significant differences. The joint must be able to withstand the torques, forces, and shear forces generated by frame analysis. In plastic designs, the strength of the gasket, rather than its stiffness, is critical in determining load capacity. The strength of the joint will determine whether plastic hinges are present on the joint or part and have a significant impact on the collapse mechanism. If the hinge is designed to appear at the joint, the joint must be designed in detail to be malleable enough to accommodate rotation. Stiffness of the joint will be important in calculating beam deflection, yaw and yaw stability.

3. Semi-continuous design of steel structure

Semi-continuous design is much more complicated than a simple or continuous design, because it can more truly said real joint response, closely monitor the actual connection behavior analysis program is very complicated, not suitable for traditional design, because they need to use sophisticated computer programs, support framework is through the core system to provide support or resistance to lateral load of the framework, in the absence of supporting framework, This resistance is caused by the bending moment of the column and beam.