https://scholars.lib.ntu.edu.tw/handle/123456789/169830
標題: | 從沖刷與耐震觀點分析最低支出下橋樑設計基面之選定 Selection of Design Base Plane of Bridge Based on Minimum Cost from Scouring and Seismic Viewpoint |
作者: | 蘇建鴻 Su, Jain-Hong |
關鍵字: | 沖刷回淤;耐震能力;容量震譜法;危害度曲線;裸露;災損分析;scour;deposit;aseismatic capability;capacity spectrum analysis;hazard curve;exposed;damage analysis | 公開日期: | 2008 | 摘要: | 橋樑耐震設計規範規定基面之設定要考慮沖刷,但可以考慮回淤。因此本研究將以橋樑耐震設計規範草案中之靜力分析法進行新建橋樑之設計,並將基面設計在不同裸露深度下,利用容量震譜法進行耐震能力之評估,再進行災損分析,求得一年內最低總支出之基面設計深度。 本研究以容量震譜法求得不同設計深度下之耐震能力,並將地震損壞分為無損壞、輕微損壞、中度損壞、嚴重損壞與完全損壞,並配合耐震能力的變異係數,求出各地表加速度下,發生各級破壞的或然率。並以不同地表加速度對應之年超越機率曲線模擬橋址地震危害度曲線。而各級損壞的修復費用,將以佔結構新建成本的比例,即損失比來處理。再考慮橋樑於一年中的裸露深度亦為隨機變數,因此將建立一完全回淤或然率曲線進行災損分析,並決定最具經濟性之基面設計深度。 The Seismic Design Specifications for Highway Bridges provide that design of base plane should be not only consider the scour but the deposit. Therefore, the present study intends to find the lowest total expenditure at different depth of design base plane. The study uses the Capacity Spectrum Analysis (CSA) to determine their aseismatic capability and damage analysis. This study uses the CSA to determine the aseismatic capability at different depth of design base plane then to divided the earthquake damage into no damage, slight damage, moderate damage, extensive damage, and complete damage. Moreover, this study also uses the Coefficient of Variation (CV) of the aseismatic capability to calculate the incidence of each damage levels on Peak Ground Acceleration (PGA). And using the annual excess probability curve correspond the different PGA to simulate the seismic hazard curve based on the location of the bridge. The repair expenses of all levels will be calculated with the percentage of the cost of the new bridge. Finally, it establishes one probability curve in the exposed depth of the location of the bridge to proceed the damage analysis. It considers that the exposed depth in a year as a random variable, and decide the depth of design base plane what is the most economical. |
URI: | http://ntur.lib.ntu.edu.tw//handle/246246/187628 |
顯示於: | 土木工程學系 |
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ntu-97-R95521216-1.pdf | 23.32 kB | Adobe PDF | 檢視/開啟 |
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