2006-08-012024-05-15https://scholars.lib.ntu.edu.tw/handle/123456789/665704摘要：自充填混凝土(Self-Compacting Concrete)為目前相當重要的營建工程材料之一，如何設計出具有良好工作性(workability)的自充填混凝土為近來研究之焦點。由於混凝土的非均質性，長時間且大量的試驗常耗費極高的人力、物力及時間成本，若能建立適當的力學模型，佐以數值分析來預估自充填混凝土之流動行為，則對於材料性質的認識及營造成本之節省均有裨益。 離散元素法(Discrete Element Method)將材料視為有限個不連續元素之集合，由微觀的角度來探討元素間的力學交互作用，進而推出材料的巨觀行為，適合用來處理非均質離散材料之模擬。而欲以之模擬自充填混凝土之流動行為時，則需找出離散元素法虛擬顆粒與自充填混凝土物理性質間的對應關係，才能正確描述其性質。本研究小組過去在國科會的贊助下(NSC91-2211-E-002-097；NSC92-2211-E-399-004)已自行開發具備高度可擴充性之物件導向離散元素模擬軟體架構，可處理各種形狀之元素及複雜之各類力學交互作用機制，並依此軟體架構對模擬自充填混凝土之數值方法進行有系統的研發，對於如何以三維離散元素模擬自充填混<br> Abstract: Self-Compacting Concrete (SCC) has become one of the most important materials in today’s construction industry. It is not an easy task to design SCC with good workability. Also, application of SCC requires the important task of estimating the workability of the designed SCC. Several types of laboratory tests have been proposed to help understand the workability of SCC. However, these tests are often time-consuming and costly. Therefore, computer simulation becomes a good alternative to understand and estimate the workability of SCC. Due to the non-homogeneous and discontinuous properties of concrete materials plus large translation and rotation of aggregates in fresh concrete flow, Discrete Element Method (DEM) becomes a better choice than the continuum mechanics based numerical approaches. By treating materials as a set of discontinuous particles with simple interaction mechanisms among them in DEM, we can then derive and simulate the macro behavior of the materials. For simulation of SCC behavior, it is necessary to establish the relationships between the numerical parameters used in the DEM model and the physical properties of SCC. It is therefore the major purpose of the proposed research to correlate between the numerical model parameters of DEM simulation and the physical parameters of SCC using a number of parametric DEM simulations as well as a set of SCC experimental tests. The proposed research takes advantage of a versatile object-oriented discrete element simulation software framework (called VEDO) developed previously by the present research team. Furthermore, the framework is currently being extended to facilitate parallel discrete element simulation for more practical engineering problems by the same research team. It is hoped that the proposed research can help establish a DEM model for SCC and understand better the physical properties and mechanisms of SCC materials and the flow behavior of SCC.離散元素法自充填混凝土材料性質模擬。Discrete Element MethodSelf-Compacting ConcreteMaterials Simulation