JPS6164935A - H-frame type earthquake-proof element - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to an H-frame seismic element mainly applied to steel frame structures in steel frame structures and steel reinforced concrete structures.

<Conventional technology> In order to improve earthquake resistance, the main structure of a structure is generally a rectangular rigid-frame bridge made up of columns and beams, and places (diagonals) are installed at the column-beam joints of this main structure. A construction method was used to attach the However, in this structure, the place attachment part is located at the column/beam joint, making installation difficult in terms of construction. In addition, conventional X-shaped places increase the rigidity of the structure more than necessary, which not only does not produce desirable results especially in high-rise buildings aiming for flexible structures, but also prevents buckling of the place material against loads and external forces. It is difficult to do so, and it is not desirable from a design standpoint that buckling of the place material caused by a destructive earthquake force may rapidly reduce the strength of the entire structure. Furthermore, the installation of an X-shaped place is
Diagonal members became an obstacle when installing building functions such as entrances, exits, or windows, creating significant design constraints.

<Purpose of the Invention> The present invention has been made in view of the above-mentioned problems, and its first purpose is to provide an H that can be pre-produced in a factory and that is easy to install on-site to a steel frame frame, which is the main structure. The aim is to provide a frame-type seismic element. Other purposes include the use of a single earthquake-resistant element to appropriately distribute the stiffness of the entire structure, provide stable earthquake-resistant restoring force, and consciously control the mechanical properties of the structure.
This is an attempt to provide four structures. Still another object of the present invention is to provide an H-frame seismic element that allows for easy installation of doorways or windows within the main structural structure to which the seismic element is attached.

<More of the invention> The present invention has been made to achieve the above object,
The gist of this is an earthquake-resistant element of an H-shaped frame that is integrally connected between the girder on the upper floor and the girder on the lower floor of a certain floor of a rigid frame frame consisting of columns and beams, which is the main structure. The H-type subframe uses a factory-produced one,
This is attached integrally to the main frame on site using pin connections or rigid connections. Furthermore, the mounting position does not necessarily have to be symmetrical to the center of the beam. Furthermore, by freely changing the thickness of the subframe cross members, the rigidity of each structural surface can be changed. Additionally, this seismic element does not need to be installed within the structure of every main structure.

<Example> Preferred embodiments of the present invention will be described below based on the accompanying drawings. Fig. 1 is a front view of the present invention, 1 is a column, 2
is a beam installed between columns, and consists of a girder on the upper floor and a girder on the lower floor. A rigid frame frame consisting of columns 1 and beams 2 is used as the main structure, and sub-frames 3 formed in an H-shape are pin-joined 4 at four locations within the structural surface of the main structure. Rigid joints and pin joints are conceivable methods of joining the vertical members of the H-shaped frame and the beams of the main structure, but rigid joints considerably increase the shear force bearing capacity of the H-shaped frame 11 and the rigidity of the entire frame. However, considering the limitations on the width of the flange on which the H-shaped frame is planted and the product accuracy and workability of the steel members, pin joints are more desirable.

Next, I chose two-layer ramen noodles as the main structure.

Regarding the relationship between the column span L and the span Q between the vertical members of the H-shaped frame, elastic analysis was performed for five cases, and stress and deformation were compared and studied as shown in the table below.

Note) a, b, c, d: H frame column capital/column base pin connection e
:H frame column head/column base rigid joint main frame
: Pillar mouth 600X600X40X40 (m/m) 9=
: H700X300X16X36 (m
/m) H-shaped frame: Vertical material H400X150X12X
25 (m/m) horizontal material, e H500x150x12
x25(m/+n)c H1000X150X12
X25 (m/m)d H1500X150X12X
25 (m/m) Q: Shearing force (1) M: Bending stress (tm) Ri H member angle (10-') Ri/Ro
: According to the ratio table of member angles based on type a, as 12/L increases by changing Q, the shear force Q and bending stress M of columns and beams increase. The shear force Q of the longitudinal member 5 becomes smaller. About this.

It is considered that in the range of Q le ≧ 1/6, as the span fl/L increases, the shear force Q and bending stress M of the column increase, and the shear force Q of the H-shaped frame decreases.

As a result, in order to reduce the shear force Q and bending stress M of the main frame, it is sufficient to reduce the span Q/L.

Note that the span ratio Q/L is approximately 1/3 in consideration of the shear force sharing of the H-shaped frame, which is an earthquake-resistant element, the degree of increase in the rigidity of the entire structure, and the convenience of constructing the H-shaped frame. is suitable.

Furthermore, as shown in Fig. 2, when considering the stress h of the cross members 6 in the H-shaped subframe, as the stress h increases, the shear force Q and bending stress of the vertical members 5 and the cross members 6 in the H-shaped frame increase. M is large.

Therefore, it is thought that the rigidity and strength of the entire frame are increased.

Therefore, by changing the width of the cross member 6 and the ratio of Q/L, we designed the entire frame of a high-rise steel frame frame, and by purposely destroying the H-shaped subframe in the event of a major earthquake, we were able to It is possible to design the structure in such a way that it prevents concentrated stress at certain points and prevents the entire structure from tilting or collapsing.

<effect> According to the above configuration of the present invention.

■ The H-shaped subframe can be pre-produced in a factory and can be easily installed on the upper and lower beams on-site using simple pin connections.

■ Q,
By setting the ratio of /L and appropriately designing seismic elements such as h, it is possible to achieve an appropriate distribution of stiffness and strength as a whole, thereby controlling the input during an earthquake and increasing the strength of each part of the structure. can be given appropriately. especially,
It is easy to configure the H-frame so that, in the event of a strong earthquake, the H-frame yields before the main frame consisting of columns and girders, so when the structure is viewed as a whole, it functions as an earthquake-resistant energy absorption mechanism. Can be done.

Furthermore, even if the H-frame yields or is damaged, it can be easily replaced and the building can be repaired and reused.

(2) In a structure composed of the main structure and the sub-frames of the H-shaped frame, gaps other than the structural members can be easily used as entrances and exits or windows.

■Furthermore, the present invention allows the rigidity and strength of the entire frame to be freely selected by changing the height h of the cross members; increasing the size of the upper and lower beams improves the earthquake resistance of the wall; It can also function as ramen noodles.

[Brief explanation of drawings]

1 and 2 are partial front views showing embodiments of the present invention, respectively. 1. Column, 2. Beam, 3. H-shaped subframe, L.
・Span between columns, Q: Span between vertical members of the subframe, h: Due to the horizontal members of the subframe.

Claims (2)

[Claims] (1) An H-frame seismic element whose main structure is a steel frame rigid frame made up of columns and beams, and which is installed between arbitrary beams facing each other on the upper and lower layers of the main structure. (2) The H-frame type seismic element according to claim 1, wherein the width of the cross members of the H-type frame can be changed.