我國的規範雖然在不同的年代，規定不同的耐震力，但是921集集大地震災區各地實際量得之最大地表加速度，卻大於當年規範規定值許多，而造成嚴重損失。醫院在地震發生時是最重要的建築物，醫院必須要有更高標準的耐震性能。過去已有不少針對學校與沿街店舖耐震診斷的相關研究，但是對於國內醫院此類較大規模建築並沒有深入的研究。本文探討如何快速地檢視國內的醫院，了解其耐震狀況後，在下次地震來臨之前，預先做好補強措施。
本文耐震診斷以非線性靜態推垮曲線法(static pushover method)為依據，計算醫院結構的崩塌地表加速度。該法稱之三次診斷法，適用於基本震動週期0.7秒以下的低層鋼筋混凝土造醫院建築。分析時假設建築物為剪力房屋(shear building)的變形模式，質量分別集中堆積於各層樓板處，外加水平載重為逆三角形豎向分佈，加在各層樓版上，三角形總水平外力由零逐漸增加至建築物崩塌為止，非線性側力位移曲線的累加則以位移控制。文內亦依據非線性靜態推垮曲線法的結果，加以簡化變成實用快速計算公式的二次診斷法，然後再次簡化為查圖的一次診斷法。
本文主要提出三種不同計算程序的耐震診斷法，使用時以一次診斷法篩選大量不及格的醫院，不合格者再使用二次診斷法篩選之，再不合格者才使用三次診斷法診斷之。各診斷法敘述如下：
1.一次診斷法為簡易查圖法。先統計建築物之柱量比與壁量比，經等值轉換後以座標值帶入一次診斷圖，繪出該點，並取實折線與虛折線讀數之較大值，即為約略保守之崩塌地表加速度。
2.二次診斷法為實用耐震診斷公式計算法。先統計出四邊、三邊、二邊圍束RC牆與RC短、中、長柱與累計樓地板等總剖面積和，帶入五條公式後取得最大值，即得更為精確的崩塌地表加速度。
3.三次診斷法為非線性靜態推垮曲線法。依據垂直構材（RC牆、RC柱）的實際尺寸、配筋及材料強度，先畫出該診斷樓層診斷方向各單一構材之水平載重與水平位移之非線性Q-Δ曲線，然後以位移控制，累加各垂直構材之水平載重，得到該診斷樓層診斷方向之層剪力與該層相對水平位移之非線性曲線。層剪力之最大值即建築物該診斷樓層之保有耐力Qu。由工址正規化水平加速度反應譜係數C、建築物重量W，依等能量原則計算等值彈性反應力Qe為基底剪力後，即可求得建築物該樓層在該診斷方向可以承受地震之崩塌地表加速度。

The 921 Chi-Chi Earthquake caused serious building damage because of the seismic capacity, designed according to the code, is not strong enough. Hospitals definitely must have higher level seismic capacity for their importance rescue function after earthquake. There are many researches on the seismic evaluation of school buildings and street-front buildings. But there is few researches on the large scale hospital structures. The main purpose of this thesis is to provide a fast and effective seismic evaluation for RC hospital. So that the vulnerable hospitals could be strengthened before the next earthquake happens.
This thesis adopt the nonlinear static pushover method to determine the collapse ground acceleration. It is applicable to the low-rise RC hospital buildings with fundamental period less then 0.7 second. It is assumed that the building deforms in the shear building mode under horizontal lateral loads. And the structure mass distributes on each floor. So the lateral load applies at each floor and distributes anti-trianglely. The lateral load increases proportionally until any floor collapses. According to the static pushover method, this paper simplifies the nonlinear calculation into a faster evaluation equations and into another even faster check curve. In other words, this thesis offers three levels of seismic evaluation. The first level evaluation is used for quick screening of the possible unsafe buildings out of tremendous RC hospitals. If it is unsafe, then use the second level evaluation to point out the possible unsafe buildings. Those possible unsafe buildings will be checked finally by the third level evaluation.
The process of these three level of evaluation are:
1. The first level evaluation is by graph checking. From the wall ratio and column ratio of the assessed, we can easily read the collapse PGA of the RC hospital building directly from the graph for the assessed story in the assessed direction.
2. The second level evaluation is by a group of practical seismic evaluation equations. To substitute the RC wall cross-sectional areas, the RC column cross-sectional areas, and the total supported floor area into 5 equations, we can calculate the collapse PGA of the RC hospital structure more precisely.
3. The third level evaluation method is the static pushover method. We have to plot nonlinear load-deflection curve for each single vertical member according to their dimensions, reinforcements, and material properties. Then we multiply they by the number of each single vertical member to get the load-deflection curve of each group of vertical members. Then, we superpose the load-deflection curves of each group of vertical members by displacement to get the story shear-deflection curve of the evaluated floor. After calculating the magnified factor of normalized spectrum acceleration C, the total weight of the building W, and the equivalent elastic base shear Qe,we can find the collapse GPA by equal-energy method .

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