Two questions about Joint element in OpenSees

[civilape_anhui]

hello！

1.I use beamcolumnjoint element in RC Frame analysis. The period of the structure is so big. Somebody else also have this problem.

2. How to model Mat1 ~ Mat4 of the 4 springs in Joint2D element ?
element Joint2D tag? Nd1? Nd2? Nd3? Nd4? NdC? [Mat1? Mat2? Mat3? Mat4?] MatC? LrgDspTag?
tag: unique element tag
Nd1: integer tag indicating node 1
NdC: integer tag indicating the central node. this tag is used for generating the internal node (the node is generated automatically by element command) and must not exist in the domain
Mat1 ~ Mat4 :a group of optional integer tags indicating the uniaxial materials for interface rotational springs injoint2D model. use a zero tag to indicate the case that a beam-column element is rigidly framed to the joint
MatC : uniaxial material for the shear panel behavior
LrgDsdTag: 0 for small deformations and constant geometry; 1 for large deformations and time varying geometry; 2 for large deformations ,time varying geometry and length correction