Concrete column and steel beam constraint release the source of the problem

For concrete column and steel beam constraint release, mainly to have two kind of situations, one is turning two is released, rotate + translation release; in 3D3S want to achieve these two goals can be in a variety of ways.

1, rotation release, is the release of connections of the moment, can end of the beam is around a 3 axis of rotation release, can also be a column around the 3 axis of rotation release, can also be a Liang Genzhu top around the 3 axis of rotation release, the calculation result is the same, to get the correct result is the premise of Liang Genzhu's orientation to the right so, 3D3S, display the command you to be familiar with, often with.

2, rotation + translation release, is released at the junction of the moment, also the release of joint movement in one direction.To achieve this purpose, can be a beam around a 3 axis rotation release + beam along a 1 axis translational release, attention, beam 1 axis is the beam along the axial direction; also can be a string around a 3 axis rotation release + columns along the 2 axis translational release; it can also be a Liang Hezhu were done, the result is the same as the.

As for when there is a need for increased translational release, depends on the specific structure, energy conservation, translational release [force (mainly for the horizontal force) direction displacement release] will inevitably lead to the release, necessarily leads to the Liang Kuazhong deflection increases, the two are related; in general, the slope is greater, the horizontal force large deflection, smaller, and vice versa, the horizontal force is released, to see whether lower structure can bear, not just for translational release, need comprehensive consideration, release effects on the beams and release on the effect of column.According to my personal view, multiple span structure release, multi span can do continuous span, can reduce the deflection of the beam; single span structure can not release will not release, great influence on deflection.

In the 3D3S component of 123 shafts, many just school friends often confused, actually not difficult, the key is to master its characteristics, 1 shaft is a component along the axial direction, is subjected to axial force direction, 2 axis, the I-shaped cross section, is the web toward the direction, only need to remember this, 2 axis is the direction of web, two, 3D3S and K node direction, but also the direction of the 2 axis, for variable cross section member, K node direction also represents member web slope changes direction, such as variable cross section beam, the upper flange flat, the lower flange is variable, that is to say the web variable slope direction is down, so the K node direction should be the coordinates of Z axis in the negative direction, in the 3D3S is the K node in Z direction negative infinity is infinite, as to why this view, here can do not need to care about it.

3 axis is vertical web toward the direction, to decide the 2 axis, and then based on 2 axis determining 3 axis, on a number of rectangular cross section, defined in section time, we should pay attention to procedure provides the diagrams in the direction of a 23 axis, generally rectangular cross section need to display section to match the judgment, or define an H-shaped cross section, and then modify the section of rectangular cross section.