The secondary beam is on the upper part of the main beam, which mainly plays the role of transmitting load.
Cross beam refers to the beam arranged transversely along the axis of the bridge and supported on the main load-bearing members in the superstructure.
[beam]: a beam (such as the main beam of a structure or a cross-shaped horizontal bar)
[chord piece]: A long, thick piece of wood, usually lying flat on a building.
Longitudinal beam refers to the beam in the superstructure, which is arranged along the axial direction of the bridge and supported on the cross beam.
In masonry buildings, closed reinforced concrete beams are set in the masonry along the horizontal direction to improve the spatial stiffness of the building, increase the integrity of the building, improve the shear and tensile strength of the masonry building, and prevent the building from being damaged by uneven settlement of the foundation, earthquake or other large vibration loads. The continuous reinforced concrete beam on the upper part of the building foundation is called the foundation ring beam, and the reinforced concrete beam on the upper part of the wall and close to the floor is called the upper ring beam.
In shear wall structure and frame-shear wall structure, the beam connecting wall limb and wall limb with frame column is called coupling beam.
When opening doors and windows on the wall, in order to bear all kinds of loads from the upper masonry of the hole and transfer these loads to the window wall, beams are often set on the doors and windows, which are called lintels.