Connection structure of beam and column, and connection member

A beam-and-column connection structure, comprising:

• a connection member having a column-connection surface connected to the column, a beam-mounting surface which is a surface approximately perpendicular to the column-connection surface, and a notch formed on the column-connection surface along the width direction of the body to avoid interference with a diaphragm;
• a pair of diaphragms formed on the column;
• a first beam of which flange parts are connected to the upper and the lower diaphragms respectively;
• and
• a second beam that has a different height to the first beam and is connected to the column in a different direction to the first beam;
• wherein,
• a flange part of the second beam is connected to one of the diaphragms;
• the column-connection surface of the connection member is connected to the peripheral surface of the column between the other flange part of the second beam and the other diaphragm;
• the thickness of the connection member at an intersection part of the extended part of the diaphragm and the connection member, in which the interference is avoided at the notch, is provided to be larger than the thickness of the column;
• and
• stress is transmitted between the other flange part of the second beam and the other diaphragm via the connection member.