考慮梁柱接頭剪力破壞之建築物耐震能力評估

Abstract

在以往由於老舊建築物箍筋量配置不足是蠻常見的問題，經過幾次的地震中，常可發現結構物因接頭強度不足而剪力破壞的情況，使得其梁之塑鉸無法完全發揮甚至無法產生塑鉸，造成結構物的耐震能力不佳而提早破壞。本研究旨在探討梁柱接頭的剪力破壞對於耐震能力評估所造成的差異。 本文是使用商業軟體SAP2000 Nonlinear Version，將接頭做單一元素模擬，於第三章中敘述設定的方法；並於第四章介紹本次分析所使用的構架再依前二章所講述流程，規劃一構架依序設計斷面尺寸及進行側推分析，並說明分析後得到的結果，最後第五章說明結論。 在結果中可發現接頭強度不足所造成的影響是非常顯著的，一旦接頭箍筋量配置不足，結構物的韌性不佳，耐震能力相對的會變差許多，而偏心與否也是一個重要的因素，但如果梁寬與柱寬相差不會很多時，相對的偏心與否就不是主要的因素。

In former days, the scantiness of stirrup allocation in old buildings is very common. After several vibrations caused by earthquakes, we can know that because the shear strengths of joints of structures are poor, their joints will suffer from shear failure, their beam’s hinges cannot work very well, and even the hinges cannot be formed. Those factors would reduce the seismic capacity of structures.The thesis deals with the difference about shear failure towards the seismic capacity of buildings. We make beam-column joint a single element emulation by the commercial software SAP2000 Nonlinear Version. The way of preference settings will be shown in chapter 3. Followed the description mentioned in Chapter Two and Three, in Chapter Four we will plan a frame for the size of design sections and make a pushover analysis, and then explain the result. Finally, we will make a conclusion in chapter 5. According to the result, we can find that the influence of the poor strength of beam-column joint is very conspicuous. If there is no enough hoop quantity allocation or no good ductility of structures, the seismic capacities of buildings will become very poor. Eccentric is also an important factor towards the seismic capacities of buildings. When the discrepancy between widths of beams and ones of columns is not big, eccentric will not be the main factor.