公开(公告)号：US20210079643A1

公开(公告)日：2021-03-18

申请号：US16897267

申请日：2020-06-10

Applicant: KUROSAWA CONSTRUCTION CO., LTD.

Inventor： Ryohei KUROSAWA

IPC: E04B1/22 ,  E04B1/98 ,  E04C3/34 ,  E04H9/02

Abstract: There is provided a method of prestressing a beam-column joint with an appropriate ratio among the magnitudes of compression in the directions of X, Y, and Z axes. The method introduces prestress in a beam-column joint with a tensile introducing force generated by tensionally anchoring prestressing tendons that are arranged in PC beams extending along two horizontal directions (or X axis and Y axis) and PC columns extending along the vertical direction (or Z axis) and passed through the beam-column joint to bring the beam-column joint in triaxial compression, the prestress being introduced such that a diagonal tensile force T generated by an input shear force due to a seismic load of an extremely great earthquake that may occur very rarely will be cancelled completely or partially so as not to allow diagonal cracks to occur. The ratio of the prestresses introduced in the directions of the respective axes satisfies the following equation (1): σx:σy:σz=1:1:0.3−0.9   (1) where σx, σy, and σz are prestresses introduced in the directions of the X axis, the Y axis, and the Z axis respectively.

公开(公告)号：US20210189726A1

公开(公告)日：2021-06-24

申请号：US16950846

申请日：2020-11-17

Applicant: KUROSAWA CONSTRUCTION CO., LTD.

Inventor： Ryohei KUROSAWA

IPC: E04C3/26 ,  E04H9/02

Abstract: There is provided a method of introducing prestress into a beam-column joint of PC construction to make it into a triaxially compressed state, in which the beam-column joint is made into a triaxial compression state and reasonable prestress is introduced into cross section areas of the ends of the members forming the beam-column joint.
A tensile introducing force is generated by tensionally anchoring PC cables passed through the beam-column joint to introduce prestresses into the cross section areas of the ends of the members forming the beam-column joints in respective axial directions to make triaxial compression state, to satisfy the following conditions (1) and (2): (1) no tensile strength is generated, with respect to long term design load, in cross-section areas of the members forming the end of the beam and the end of the column, which ends are in contact with the beam-column joint; and (2) upon occurring of extremely large scale earthquake (very rarely occurred earthquake), in the beam-column joint, no generation of diagonal cracks is allowed to be generated but diagonal tensile stress intensity caused due to shear force inputted by seismic load is made less than allowable tensile stress intensity of concrete.

公开(公告)号：US09534411B2

公开(公告)日：2017-01-03

申请号：US14710901

申请日：2015-05-13

Applicant: Kurosawa Construction Co., Ltd.

Inventor： Ryohei Kurosawa

IPC: E04B1/98 ,  E04H9/02 ,  E04H12/16 ,  E04C3/34 ,  E04C5/01 ,  E04B1/22

CPC classification number: E04H9/021 ,  E04B1/22 ,  E04B1/98 ,  E04C3/34 ,  E04C5/012 ,  E04H9/02 ,  E04H9/025 ,  E04H12/16

Abstract: In an earthquake resisting design method of a PC construction, a column and a beam, which are high-strength precast prestress concrete members, are joined by binding juncture with a prestressing tendon. A grout is filled and bonded. A first stage linear resilient design is employed, where all construction members are not damaged, for earthquakes up to a predetermined earthquake load design value. A second stage linear resilient design is employed, where earthquake energy is absorbed by breakage of the bond of the grout, and principal construction members are not damaged, for earthquakes exceeding the predetermined earthquake load design value. By employing a non-linear resilient design in which the first stage linear resilient design and the second stage linear resilient design are combined, an earthquake-resisting design level is significantly increased, and the construction can resist earthquakes exceeding a seismic intensity 6 upper.

Abstract translation: 在PC结构的抗震设计方法中，作为高强度预制预应力混凝土构件的柱和梁通过结合接合处与预应力筋连接。 灌浆和灌浆。 采用第一级线性弹性设计，其中所有建筑构件都不被破坏，用于达到预定的地震载荷设计值的地震。 采用第二级线性弹性设计，其中地震能量被水泥浆粘结破坏所吸收，主体构件不会受到破坏，超过预定的地震荷载设计值。 通过采用第一级线性弹性设计和第二级线性弹性设计组合的非线性弹性设计，大大提高了抗震设计水平，并且该结构可以抵抗超过地震烈度6以上的地震。

公开(公告)号：US20150330095A1

公开(公告)日：2015-11-19

申请号：US14710901

申请日：2015-05-13

Applicant: Kurosawa Construction Co., Ltd.

Inventor： Ryohei KUROSAWA

IPC: E04H9/02 ,  E04C5/01 ,  E04C3/34 ,  E04B1/98 ,  E04H12/16

CPC classification number: E04H9/021 ,  E04B1/22 ,  E04B1/98 ,  E04C3/34 ,  E04C5/012 ,  E04H9/02 ,  E04H9/025 ,  E04H12/16

Abstract: In an earthquake resisting design method of a PC construction, a column and a beam, which are high-strength precast prestress concrete members, is joined by binding juncture with a prestressing tendon. A grout is filled and bonded. A first stage linear resilient design is employed, where all construction members are not damaged, for earthquakes up to a predetermined earthquake load design value. A second stage linear resilient design is employed, where earthquake energy is absorbed by breakage of the bond of the grout, and principal construction members are not damaged, for earthquakes exceeding the predetermined earthquake load design value. By employing a non-linear resilient design in which the first stage linear resilient design and the second stage linear resilient design is combined, an earthquake-resisting design level is significantly increased, the construction can resist earthquakes exceeding a seismic intensity 6 upper.

Abstract translation: 在PC结构的抗震设计方法中，作为高强度预制预应力混凝土构件的柱和梁通过结合接头与预应力筋连接。 灌浆和灌浆。 采用第一级线性弹性设计，其中所有建筑构件都不被破坏，用于达到预定的地震载荷设计值的地震。 采用第二级线性弹性设计，其中地震能量被水泥浆粘结破坏所吸收，主体构件不会受到破坏，超过预定的地震荷载设计值。 通过采用第一级线性弹性设计和第二级线性弹性设计组合的非线性弹性设计，抗震设计水平显着提高，该结构可以抵抗超过地震烈度6上方的地震。