本文統整26棟經歷2024年0403花蓮地震之建築物震害調查結果，其中7棟曾施行耐震補強。本文根據建物震害樣態分類其震害等級，並分析震害主要原因，包括：老舊建物非韌性設計引致脆性剪力破壞、軟弱底層效應、及非結構構材與結構體之互制。比較2018與2024兩次地震建築物震害情況，驗證了正規耐震補強之有效性，典型校舍耐震評估與補強計畫施行多年有成，對比2024地震中唯一嚴重震害之無補強校舍，其餘已經補強的校舍於兩次地震中皆幾乎無受害。針對垂直構件之剪力強度與韌性予以加強，並消除軟弱底層之存在，可確實改善既有RC建物之耐震能力，本次勘查7棟補強建物震害等級皆甚為輕微，其中曾經於2018地震受害達中等程度的建物，經過耐震補強也能持續如常使用，並且提升耐震表現。僅針對軟弱底層實施的弱層補強，可經濟、迅速地達到不遜於全面完整補強的效果，在預算有限與時間急迫性之考量下是為可行的選擇。

This paper consolidates the damage survey results of 26 buildings affected by the Hualien earthquake on April 3, 2024, among which 7 had undergone seismic retrofitting. The paper classifies the damage levels based on observed damage patterns and analyzes the main causes, including: brittle shear failure due to the lack of ductile design in older buildings, soft-first-story effects, and the interaction between non-structural and structural elements. By comparing the damage conditions of buildings in the 2018 and 2024 earthquakes, the effectiveness of proper seismic retrofitting is demonstrated. Seismic assessments and retrofitting programs for typical school buildings have been successfully implemented for years. Compared to the only severely damaged unretrofitted school building in the 2024 earthquake, retrofitted school buildings experienced almost no damage in both earthquakes. Strengthening the shear capacity and ductility of vertical components and addressing soft-story issues can significantly improve the seismic performance of existing RC buildings. In this survey, all 7 retrofitted buildings showed only minor or no damage. Buildings that had sustained moderate damage in the 2018 earthquake continued to function normally and demonstrated improved seismic performance after retrofitting. Weak-story retrofitting, specifically targeting soft-story conditions, can economically and quickly achieve results comparable to comprehensive retrofitting, making it a viable option under budget constraints and time urgency.