Prefabricated combined beam and column node member

Abstract

The invention relates to a prefabricated combined beam and column node member. The prefabricated combined beam and column node member comprises a cross beam and a vertical column which are intersected, wherein the cross beam as well as the vertical column comprises an ECC (engineered cementitious composite) material, longitudinal bars and stirrups, and a rectangular region where the cross beam and the vertical column are intersected and superposed is in the transverse width of A and the longitudinal height of B; the cross beam is in the transverse width of 2B plus A and the longitudinal height of B, and the longitudinal bars penetrate the full length of the cross beam and extend out of two beam ends by 10cm-15cm; and the vertical column in the longitudinal height of 2A plus B, and the longitudinal bars penetrate the full length of the vertical column and extend out of the two column ends by 10cm-15cm. The prefabricated combined beam and column node member disclosed by the invention is the prefabricated member which is formed by casting the steel bar-reinforced ECC material and is applied to an anti-seismic key part, in particular to a key node. Compared with an ordinary reinforced concrete member, the prefabricated combined beam and column node member can significantly improve the ductility and the anti-seismic performance of the structure, greatly reduce the use of the stirrups at the node under the condition of meeting the anti-seismic requirement and solve the difficult problem in construction caused by too dense stirrups in a node region.

Description

technical field [0001] The invention relates to a fiber cement-based composite material (ECC) prefabricated beam-column node component reinforced by steel bars, which belongs to a new type of force-bearing component and is mainly used in high-seismic fortification areas to replace traditional cast-in-place reinforced concrete nodes. Background technique [0002] ECC (engineered cementitious composites, fiber cement-based composites for engineering) is a new type of cement-based composite material that uses cement and fine sand as fillers, and then adds synthetic fibers. A large number of research results on physical and mechanical properties show that ECC materials not only have ultra-high toughness, but also have strong energy absorption capacity. Moreover, tests have confirmed that the ultimate tensile strain value of this material is about 100-300 times that of ordinary concrete materials, about 5-10 times that of steel bars, and its value can exceed 3%, which provides a ...

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Problems solved by technology

[0003] The beam-column edge joints and the surrounding area of ​​the frame structure have to bear a lot of internal force under the action of the earthquake. In the Wenchuan earthquake, a large number of buildings were damaged due to the plastic hinge at the end of the beam-column or the damage of the core area of ​​the joint, and the general structure (frame, shear Wall structure, etc.) In order to realize the seismic design concepts and requirements of "strong column weak beam", "strong shear weak bending" and "strong joint", dense stirrups are arranged at the concrete beams, columns and their beam-column joints, To prevent the shear damage of beams and columns, but the dense stirrups bring great difficulties to the site construction, and it is easy to cause the joints or key parts of the concrete to vibrate not densely, which brings safety hazards

[0004] In addition, in the actual construction process, the steel bars between the prefabricated nodes and adjacent components are often connected by welding. Due to the irregular shape of the ends of the steel bars, the two joints are not easy to align, and the steel bar heads lack stable support and positioning during butt welding. As a result, the quality of welding points is often not guaranteed and becomes a weak point of the structure

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