IMPROVING SEISMIC RESISTANCE OF HYDRAULIC STRUCTURES USING SOIL IMPROVEMENT TECHNIQUES
Most of the Egyptian irrigation structures were built many decades ago. Most of these structures may be classified as unsafe structures when making an assessment of their resistance to earthquake loads in accordance with the current specifications. This research suggests a technique to increase the ability of these structures to resist seismic loads. The suggested technique depends on using soil improvement methods to improve the most stressed soil bulb zone under the structure. The effect of seismic site soil factor will be decreased by improving this part of soil. Controlled soil jet grouting technique could be used for the existing structures. Other types of soil improvement techniques such as soil mixing could be used for new structures or other types of earth structures. Numerical study was performed to investigate the feasibility of the suggested method. Experimental study was carried out to validate the numerical study. The dynamic responses of an improved location and normal location were measured. The two locations were subjected to the same excitation force. The measured responses were compared and evaluated. Based on the results of the suggested technique, a real site condition for an existing barrage structure was numerically analyzed before and after soil improvement to examine the suggested technique.
A NEW COMPOSITE FOUNDATION OF STEEL PILE WITH SOIL IMPROVED
地盤改良複合杭基礎は, 軟弱地盤での基礎の水平抵抗を向上させるため, 地盤改良体と杭からなる複合杭基礎形式である. 本基礎形式は, 一般の杭基礎よりも大きな地盤抵抗が期待でき, 排土量が少なく, 環境に優しい基礎であると考えられる. 本基礎の有効性および設計法の確立を図るため, 地盤改良複合杭基礎を2試験体製作し, 載荷試験を実施した. 載荷試験から, 地盤改良体と鋼管杭は, 改良体前面幅の1%程度の変位において一体構造としての挙動を示し, 十分な複合効果が見られた. また, この基礎の水平抵抗メカニズムを検討するために, 3次元FEM解析を行った. 実務への適用を図るため, 梁バネモデルを提案し, この設計モデルによる解析結果と載荷試験結果の比較より, 設計モデルの有用性を確認した.
The evaluation of the competency perception of inspectors in using new instructional technology
Abstract The purpose of this study is to find out the evaluation of inspectors in regards to their competency perceptions towards the use of new instructional technologies. This is a qualitative model research. The target population of this study consisted of 25 inspectors serving within the borders of TRNC in 2011. Data was collected by an “interview form” developed by the researcher. The interview form consisted of 6 items. Content analyze, frequency (f) and percentage (%) techniques were used to analyze the data. This research pointed out that: “concerns on falling behind the teacher”, “training needs”, “decreasing training support within the years” and “non existing policy on IT support” are critical factors affecting an inspector's competency perceptions in using new instructional technologies.