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README.md

@@ -1,22 +1,22 @@
 ---
-title: Continuous Beam RC Design
-emoji: 🏗️
+title: "Continuous Beam RC Design - Thai Standards"
+emoji: "🏗️"
 colorFrom: blue
 colorTo: green
 sdk: gradio
-sdk_version: 5.34.2
+sdk_version: "4.0.0"
 app_file: app.py
 pinned: false
 ---
 
-# Continuous Beam RC Design App
+# Continuous Beam RC Design App - Thai Standards
 
-A comprehensive continuous beam reinforced concrete design application using finite element analysis and ACI code provisions.
+A comprehensive continuous beam reinforced concrete design application using finite element analysis with Thai reinforcement standards.
 
 ## Features
 
 - **Finite Element Analysis**: Accurate structural analysis for up to 10 spans
-- **ACI Code Compliance**: Reinforcement design according to ACI 318
+- **Thai Standards**: Reinforcement design using Thai steel grades (fy = 4000 ksc)
 - **Multiple Loading Types**: 
   - Distributed loads (kN/m)
   - Point loads (kN)
@@ -39,7 +39,10 @@ A comprehensive continuous beam reinforced concrete design application using fin
 ## Technical Details
 
 - **Analysis Method**: Finite Element Method with beam elements
-- **Design Code**: ACI 318 (American Concrete Institute)
+- **Design Standards**: Thai reinforcement standards
+- **Steel Strength**: fy = 4000 ksc (Thai standard)
+- **Reinforcement Bars**: DB12, DB16, DB20, DB24, DB32
+- **Stirrups**: RB6, RB9 (selected automatically based on shear demand)
 - **Capacity**: Up to 10 continuous spans
 - **Load Types**: Distributed and concentrated loads
 - **Output**: Moments, shears, reinforcement, stirrups
@@ -54,4 +57,4 @@ A comprehensive continuous beam reinforced concrete design application using fin
 
 ---
 
-*Using advanced finite element analysis for accurate continuous beam behavior*
+*Using advanced finite element analysis for accurate continuous beam behavior*

app.py

@@ -150,10 +150,10 @@ class GradioBeamApp:
 def create_interface():
     app = GradioBeamApp()
     
-    with gr.Blocks(title="Continuous Beam RC Design - ACI Code", theme=gr.themes.Default()) as interface:
+    with gr.Blocks(title="Continuous Beam RC Design - Thai Standards", theme=gr.themes.Default()) as interface:
         
-        gr.Markdown("# Continuous Beam RC Design - ACI Code")
-        gr.Markdown("*Using Finite Element Analysis for accurate structural behavior*")
+        gr.Markdown("# Continuous Beam RC Design - Thai Standards")
+        gr.Markdown("*Using Finite Element Analysis with Thai reinforcement standards (DB bars, RB stirrups)*")
         
         with gr.Row():
             with gr.Column(scale=1):
@@ -164,8 +164,8 @@ def create_interface():
                     depth_input = gr.Number(label="Beam Depth (mm)", value=500)
                 
                 with gr.Row():
-                    fc_input = gr.Number(label="f'c (MPa)", value=28)
-                    fy_input = gr.Number(label="fy (MPa)", value=420)
+                    fc_input = gr.Number(label="f'c (ksc)", value=280)
+                    fy_input = gr.Number(label="fy (ksc)", value=4000)
                 
                 cover_input = gr.Number(label="Cover (mm)", value=40)
                 

continuous_beam.py

@@ -21,8 +21,8 @@ class ContinuousBeam:
         self.supports = []
         self.moments = []
         self.shears = []
-        self.fc = 28  # Concrete compressive strength (MPa)
-        self.fy = 420  # Steel yield strength (MPa)
+        self.fc = 280  # Concrete compressive strength (ksc) - converted from 28 MPa
+        self.fy = 4000  # Steel yield strength (ksc) - Thai standard
         self.beam_width = 300  # mm
         self.beam_depth = 500  # mm
         self.cover = 40  # mm
@@ -479,9 +479,9 @@ class ContinuousBeam:
         # Convert moment to N-mm
         Mu = abs(moment) * 1e6
         
-        # Material properties
-        fc = self.fc  # MPa
-        fy = self.fy  # MPa
+        # Material properties - convert from ksc to MPa
+        fc = self.fc / 10.2  # Convert ksc to MPa (1 ksc ≈ 0.098 MPa)
+        fy = self.fy / 10.2  # Convert ksc to MPa
         b = self.beam_width  # mm
         d = self.d  # mm
         
@@ -526,9 +526,9 @@ class ContinuousBeam:
         # Convert shear to N
         Vu = abs(shear) * 1000
         
-        # Material properties
-        fc = self.fc  # MPa
-        fy = self.fy  # MPa (for stirrups)
+        # Material properties - convert from ksc to MPa
+        fc = self.fc / 10.2  # Convert ksc to MPa
+        fy = self.fy / 10.2  # Convert ksc to MPa (for stirrups)
         b = self.beam_width  # mm
         d = self.d  # mm
         
@@ -552,8 +552,15 @@ class ContinuousBeam:
             raise ValueError("Shear exceeds maximum capacity - increase beam size")
         
         # Calculate required stirrup area
-        # Assuming #10 stirrups (2 legs, Area = 2 × 71 = 142 mm²)
-        Av = 142  # mm² (2-leg #10 stirrups)
+        # Use RB9 or RB6 stirrups based on shear demand
+        if Vs > 150000:  # High shear - use RB9
+            stirrup_dia = 9
+            Av = 2 * math.pi * (9/2)**2  # 2-leg RB9 stirrups = 2 × 63.6 = 127 mm²
+            stirrup_designation = "RB9"
+        else:  # Lower shear - use RB6
+            stirrup_dia = 6
+            Av = 2 * math.pi * (6/2)**2  # 2-leg RB6 stirrups = 2 × 28.3 = 57 mm²
+            stirrup_designation = "RB6"
         
         # Calculate required spacing
         s_required = Av * fy * d / Vs  # mm
@@ -571,10 +578,11 @@ class ContinuousBeam:
         s_required = max(s_required, 50)  # Minimum practical spacing
         
         return {
-            "stirrup_spacing": f"{s_required:.0f} mm c/c",
+            "stirrup_spacing": f"{stirrup_designation} @ {s_required:.0f} mm c/c",
             "Av": Av,
             "Vs": Vs / 1000,  # Convert back to kN
-            "Vc": Vc / 1000   # Convert back to kN
+            "Vc": Vc / 1000,   # Convert back to kN
+            "stirrup_type": stirrup_designation
         }
     
     def design_beam(self):
@@ -604,8 +612,14 @@ class ContinuousBeam:
                 if moment != 0:
                     As_required = self.calculate_required_reinforcement(moment)
                     
-                    # Select reinforcement bars
-                    bar_areas = {10: 79, 12: 113, 16: 201, 20: 314, 25: 491}  # mm²
+                    # Select reinforcement bars - Thai DB bars
+                    bar_areas = {
+                        12: 113,   # DB12: π×(12/2)² = 113 mm²
+                        16: 201,   # DB16: π×(16/2)² = 201 mm²
+                        20: 314,   # DB20: π×(20/2)² = 314 mm²
+                        24: 452,   # DB24: π×(24/2)² = 452 mm²
+                        32: 804    # DB32: π×(32/2)² = 804 mm²
+                    }
                     
                     # Try different bar sizes
                     for bar_size, bar_area in bar_areas.items():
@@ -615,8 +629,8 @@ class ContinuousBeam:
                             break
                     else:
                         # Use largest bars if can't fit
-                        bar_size = 25
-                        bar_area = 491
+                        bar_size = 32
+                        bar_area = 804
                         num_bars = math.ceil(As_required / bar_area)
                         As_provided = num_bars * bar_area
                     
@@ -625,7 +639,7 @@ class ContinuousBeam:
                         'moment': moment,
                         'As_required': As_required,
                         'As_provided': As_provided,
-                        'bars': f"{num_bars}T{bar_size}",
+                        'bars': f"{num_bars}-DB{bar_size}",
                         'ratio': As_provided / (self.beam_width * self.d) * 100
                     }
                 else: