以資料庫回歸台灣混凝土潛變預測公式並應用於預力橋梁長期變位分析

本研究統整台灣近40年的試驗資料並建立「台灣混凝土收縮與潛變資料庫」，並比較國內外資料庫後，發現台灣混凝土有漿體量高、低水灰比、低粒料勁度等特性，若直接套用國外預測式將不保守。故選用Bazant的Model B4為預測公式之基礎，對以上參數進行本土化修正，提出台灣普通混凝土之預測式。另外，近年來混凝土常添加卜作嵐材料，本研究將普通混凝土預測式延伸，針對添加卜作嵐材料之混凝土再進一步修正。混凝土潛變行為對於長跨預力橋梁長期變形影響甚鉅，為比較本土化與國外收縮潛變預測公式對橋梁長期變形的差異，本研究使用MIDAS Civil建立預力橋梁模型，套用國內外預測模型並比較分析結果，發現國外預測模型有嚴重低估變位與預力損失的現象，實務上若直接套用國外規範進行設計將會錯估使用年限與結構長期變位。

關鍵字

資料庫；長期變形；潛變；預力橋梁；預力損失

並列摘要

This research integrates the test data of the past 40 years in Taiwan and establishes the ＂Shrinkage and Creep Database in Taiwan＂. After comparing the domestic and foreign database, it is found that concrete in Taiwan has high cementitious material content, low water-cement ratio, and low aggregate stiffness, and it is not conservative if the foreign prediction model is directly applied. Therefore, Bazant's Model B4 was selected as the basis of the prediction model, and the above parameters were localized and revised, and the prediction model of Taiwan ordinary concrete was proposed. In addition, this study extends the prediction model of ordinary concrete and revises the concrete with pozzolanic materials. Creep of concrete has a great influence on the long-term deformation of long-span prestressed bridges. In order to compare the difference between the domestic and foreign shrinkage and creep prediction models on the long-term deformation of the bridge, this study uses MIDAS Civil to establish a prestressed concrete bridge, and compares the analysis results between domestic and foreign prediction models. It is found that the foreign prediction models have seriously underestimated the deformation and prestress loss.

並列關鍵字

Database ； Long-term deformation ； Creep ； Prestressed concretebridge ； Prestress loss

國際替代計量

以資料庫回歸台灣混凝土潛變預測公式並應用於預力橋梁長期變位分析

全文下載

主題瀏覽