Update set_038/set_038_黄誉扬.json

set_038/set_038_黄誉扬.json

@@ -1,63 +1,63 @@
-{
-    "set_id": "set_038",
-    "annotator": "黄誉扬",
-    "qa_pairs": [
-        {
-            "id": 1,
-            "domain": "Education",
-            "task_type": {
-                "L1": "III. Cross-Video Integrated Reasoning",
-                "L2": "4. Domain Knowledge Application",
-                "L3": "(1) Specialized Knowledge Comprehension"
-            },
-            "question": "Based on the physical laws in Video A, explain the fundamental dynamic cause of the bridge collapse in Video B?",
-            "options": {
-                "A": "Wind force instantaneously exceeded the compressive strength of steel",
-                "B": "Resonance occurred between the vortex frequency induced by wind and the natural frequency of the bridge structure, leading to uncontrolled amplitude",
-                "C": "Foundation settlement of the bridge piers",
-                "D": "Cold brittleness of steel due to low temperature"
-            },
-            "answer": "B",
-            "evidence": [],
-            "created_at": "2026-02-24T19:01:39.506813"
-        },
-        {
-            "id": 2,
-            "domain": "Education",
-            "task_type": {
-                "L1": "III. Cross-Video Integrated Reasoning",
-                "L2": "4. Domain Knowledge Application",
-                "L3": "(1) Specialized Knowledge Comprehension"
-            },
-            "question": "Based on the theory of 'energy dissipation' in Video A, explain why the bridge in Video B fractured after hours of oscillation instead of gradually stopping swaying?",
-            "options": {
-                "A": "Material fatigue: Steel naturally aged due to long service life",
-                "B": "Energy accumulation caused by low damping: The bridge structure lacked sufficient damping (energy absorption) mechanisms, resulting in wind energy input into the system far exceeding the energy dissipation rate of the system, and amplitude continuously accumulated until exceeding the structural limit",
-                "C": "Gravity imbalance: Uneven vehicle distribution on the bridge deck",
-                "D": "Sudden wind direction change: Wind shifted from lateral to longitudinal"
-            },
-            "answer": "B",
-            "evidence": [],
-            "created_at": "2026-02-24T19:05:55.626546"
-        },
-        {
-            "id": 3,
-            "domain": "Education",
-            "task_type": {
-                "L1": "III. Cross-Video Integrated Reasoning",
-                "L2": "4. Domain Knowledge Application",
-                "L3": "(1) Specialized Knowledge Comprehension"
-            },
-            "question": "Since the wind in Video B is steady, based on the theory in Video A, where does this 'periodic driving force' come from?",
-            "options": {
-                "A": "Vehicle vibration: Traffic on the bridge formed periodic impacts",
-                "B": "Tidal rhythm: Periodic force generated by sea level fluctuation",
-                "C": "Karman vortex street effect (Vortex Shedding): After steady airflow passed the bridge girders, periodic shedding vortices were generated due to structural obstruction, exerting alternating periodic lateral forces on the bridge",
-                "D": "The theory in Video A is not applicable to macroscopic buildings"
-            },
-            "answer": "C",
-            "evidence": [],
-            "created_at": "2026-02-24T19:06:52.550631"
-        }
-    ]
+{
+    "set_id": "set_038",
+    "annotator": "黄誉扬",
+    "qa_pairs": [
+        {
+            "id": 1,
+            "domain": "Education",
+            "task_type": {
+                "L1": "Cross-Video Integrated Reasoning",
+                "L2": "Domain Knowledge Application",
+                "L3": "Specialized Knowledge Comprehension"
+            },
+            "question": "Based on Video A, explain the fundamental dynamic cause of the bridge collapse in Video B?",
+            "options": {
+                "A": "Lateral wind pressure directly exceeded the ultimate compressive strength of the bridge's steel structure",
+                "B": "Wind-induced vortex shedding frequency resonated with the bridge's natural frequency, amplifying amplitude until structural instability",
+                "C": "Under the superposition of alternating gust loads and long-term structural stress, fatigue cracks appeared and expanded continuously on the main beam welds, eventually triggering overall structural collapse",
+                "D": "Bridge piers suffered uneven foundation settlement due to long-term water erosion, causing structural stress imbalance; under the action of strong winds, the main beam broke and led to the entire bridge collapse"
+            },
+            "answer": "B",
+            "evidence": [],
+            "created_at": "2026-02-24T19:01:39.506813"
+        },
+        {
+            "id": 2,
+            "domain": "Education",
+            "task_type": {
+                "L1": "Cross-Video Integrated Reasoning",
+                "L2": "Domain Knowledge Application",
+                "L3": "Specialized Knowledge Comprehension"
+            },
+            "question": "Based on Video A, explain why the bridge in Video B fractured after hours of oscillation instead of gradually stopping swaying?",
+            "options": {
+                "A": "Material fatigue: Steel naturally aged due to long service life",
+                "B": "Low damping made wind energy input far exceed energy dissipation, amplifying vibrations until structural failure",
+                "C": "Low damping made wind energy input far exceed energy dissipation, amplifying vibrations until structural failure",
+                "D": "Pier bearings became loose during sustained swaying, making the bridge unable to release vibration energy via structural displacement and collapsing under repeated cyclic stress"
+            },
+            "answer": "B",
+            "evidence": [],
+            "created_at": "2026-02-24T19:05:55.626546"
+        },
+        {
+            "id": 3,
+            "domain": "Education",
+            "task_type": {
+                "L1": "Cross-Video Integrated Reasoning",
+                "L2": "Domain Knowledge Application",
+                "L3": "Specialized Knowledge Comprehension"
+            },
+            "question": "Since the wind in Video B is steady, based on Video A, where does this 'periodic driving force' come from?",
+            "options": {
+                "A": "Continuous thermal expansion and contraction of the bridge steel structure under sunlight changes produced regular cyclic stress, forming a stable periodic driving force on the bridge body",
+                "B": "Unbalanced aerodynamic pressure on both sides of the bridge deck changed periodically with slight swing, forming a self-excited periodic force that continuously acted on the main beam",
+                "C": "Steady wind formed periodic shedding vortices behind the girder, exerting alternating lateral forces on the bridge",
+                "D": "Slight geological vibrations in the site transmitted periodic force to the bridge piers continuously, which drove the bridge to produce regular reciprocating oscillation"
+            },
+            "answer": "C",
+            "evidence": [],
+            "created_at": "2026-02-24T19:06:52.550631"
+        }
+    ]
 }