1. According to the requirements of seismic code, constructional columns are mainly arranged in seismic walls.
2, 120 (or 100) thick wall When the wall height is less than or equal to 3 m, the width of the hole is less than or equal to 2.4m, if not, constructional columns or reinforced concrete horizontal tie beams should be added.
3. 180 (or 190) thick wall When the wall height is less than or equal to 4m, the width of the hole is less than or equal to 3.5m Otherwise, constructional columns or reinforced concrete horizontal tie beams should be added.
Extended data:
In multi-storey masonry buildings, the function of brick masonry in the bottom frame is generally to strengthen the connection between longitudinal walls, because the constructional column is connected with the adjacent longitudinal and transverse walls and teeth, and 2 (6) Rachel bars are set every 500mm along the wall height, and the Rachel bars on each side extend into the wall more than1000 mm.
In general construction, brick walls are laid first and then concrete columns are poured, which can increase the combination of transverse walls and improve the shear bearing capacity of masonry 10%-30%. Although the increase rate is not high, it can obviously inhibit wall cracking and limit the occurrence of cracks. The joint work of constructional column and ring beam can separate and enclose brick masonry. When cracks appear in masonry, they can be forced to be in a closed range and will not expand further.
Although there are cracks in masonry, it can limit its dislocation, maintain its bearing capacity, offset vibration energy and make it not easy to collapse early. Masonry structure, as a vertical load-bearing component, is most afraid of collapsing to the ground in an earthquake, thus causing the collapse of horizontal floors and roofs, and constructional columns can prevent or delay the collapse time to reduce losses. The connection between constructional column and ring beam can also play a similar role to frame structure, and the effect is very obvious.
In masonry structure, its main function is to form a whole with ring beam, enhance the seismic performance of masonry structure, reduce and control wall cracks, and enhance the strength of masonry.
In the frame structure, its function is that when the infilled wall is more than twice as high or a relatively large hole is opened without support in the middle, the longitudinal stiffness will be very weak, and it is necessary to set up structural columns to strengthen it to prevent the wall from cracking.
References:
Baidu encyclopedia-constructional column