diff --git a/README.md b/README.md
index d77f560..5e929b6 100644
--- a/README.md
+++ b/README.md
@@ -57,6 +57,24 @@ obj.solve(Id_bound,lx,ly,t,w,creep,ec,nu,nmax,mmax)
 - My2: Positive Moment at Cent. for the longer span
 
 
+## aijRc.py
+### how to
+``` python
+obj = Aij_rc_set()
+obj.Ra(index)
+obj.Ra_p(index,pitch)
+obj.Ec(fc,gamma)
+```
+### input
+- index: "D10", "D13", ......, "D41"
+- pitch: "200", "100"
+- fc: compressive concrete strength, N/mm2
+- gamma: concrete dry density, kN/m3
+### return
+- obj.Ra: Area of the bar
+- obj.Ra_p: Area of the bar within 1.0 m
+- Ec: young modulus by AIJ Standard
+
 ## Module
 - numpy
 - sympy
diff --git a/aijRc.py b/aijRc.py
new file mode 100755
index 0000000..23c7eec
--- /dev/null
+++ b/aijRc.py
@@ -0,0 +1,63 @@
+#! /Users/tsuno/.pyenv/shims/python3
+# -*- coding: utf-8 -*-
+
+"""
+Created on Wed Jan  6 16:07:40 2021
+@author: Tsunoppy
+"""
+class Aij_rc_set():
+
+    #
+    # Young Modulus
+    def Ec(self,fc,gamma):
+        # gamma: Dry density
+        econ = 3.35 * 10**4 * ( gamma/24.0 )**(2) * (fc/60.0)**(1.0/3.0)
+        return econ
+
+    #
+    # Ra: Rebar Area mm2
+    def Ra(self,index):
+        if index =='D10':
+            return 71.
+        elif index =='D13':
+            return 127.0
+        elif index =='D16':
+            return 199.0
+        elif index =='D19':
+            return 287.0
+        elif index =='D22':
+            return 387.0
+        elif index =='D25':
+            return 507.0
+        elif index =='D29':
+            return 642.0
+        elif index =='D32':
+            return 794.0
+        elif index =='D35':
+            return 957.0
+        elif index =='D38':
+            return 1140.
+        elif index =='D41':
+            return 1340.0
+        #
+        elif index=='D10+D13':
+            return 99.0
+        elif index=='D13+D16':
+            return 163.0
+        elif index=='D16+D19':
+            return 243.0
+        else:
+            print("error")
+            return 'Err.'
+
+    # mm2/m
+    def Ra_p(self,index,p):
+        # p: Bar pitch
+        return self.Ra(index)*1000.0/p
+
+# test
+"""
+obj = Aij_rc_set()
+print( obj.Ra('D41'))
+print( obj.Ra_p('D13',200.0))
+"""
diff --git a/higashi.py b/higashi.py
index 20cbe92..610bb19 100755
--- a/higashi.py
+++ b/higashi.py
@@ -1531,6 +1531,50 @@ def fxy_max(self,fxy,ndim,x1,x2,index):
 
         return fmax
 
+    ########################################################################
+    # 2辺固定2辺支持版
+    # p120, ３型による解
+    def m_2fix_2pin(self,lamda,nu,nmax,mmax):
+        # mmax はダミー
+        # 初期計算
+        pi = math.pi
+        a = 1.0
+        b = lamda * a
+        y = []
+        mx = []
+
+        for n in range(1,nmax+1):
+
+
+            beta = (2.0*n-1)/(2.0*b) * pi
+            beta_a = beta*a
+
+            a1 = 2.0*(-1.0)**n / a**2 / beta**3 / b \
+                *( math.cosh(beta_a)*math.sinh(beta_a) - beta_a )\
+                /( math.cosh(beta_a)*math.sinh(beta_a) + beta_a )
+
+            mx.append(a1)
+
+        mx_end = 0
+        my_end = 0
+        for n in range(1,nmax+1):
+            mx_end = mx_end + mx[n-1]
+
+        # print calculation log
+        print('# ', 'Solve, two side fix w/ two side pin plate')
+        print()
+        print('ly/lx =', lamda, 'nu=', nu)
+        print('nmax =', nmax, 'mmax = 0(No Need)')
+        print()
+        print('mx = ', mx)
+        print('mx1 = ', mx_end/4)
+        print('my1 = ', 0.0)
+        print()
+
+        # たわみ関数の呼び出
+        #tmpData = self.w_4fix(lamda,nmax,mmax,mx,nu)
+
+        #return mx_end/4,tmpData[0],my_end/4,tmpData[1],tmpData[2]
 ########################################################################
 # End Class
 
@@ -1544,6 +1588,7 @@ def fxy_max(self,fxy,ndim,x1,x2,index):
 #obj.m_2fix(lamda,nu,nmax,mmax,1)
 
 #obj.m_3fix_1pin(lamda,nu,nmax,mmax)
+obj.m_2fix_2pin(lamda,nu,nmax,mmax)
 """
 # ２変数の定義
 sym.var('x y', real = True)