Influence of the interior cross braces on the load-carrying capacity of frame-type scaffolds

• Main Authors: LI-HSIN CHEN, 陳立信
• Other Authors: 林宜清
• Format: Others
• Language: zh-TW
• Published: 2012
• Online Access: http://ndltd.ncl.edu.tw/handle/01613849687339914315

碩士 === 國立中興大學 === 土木工程學系所 === 100 === When the cross-bar is set up according to the existing regulations, it is likely to cause inconvenience to practical operation and pose concerns on the operational safety. In order to ease the operation, the cross-bar of a box-frame may be removed. This may lead to the collapse of the box-frame or the falling of construction workers and, therefore, result in industrial safety incident. Utilizing both physical loading test and questionnaire survey, this study explores the loading capability of a box-frame and the experience feedback from the construction practitioners. The physical loading test is conducted on a single-row, three-layer box-frame, trading off cross-bar or horizontal-bard on single side or both sides. This research is conducted on 4 groups of box-frame construction, numbered by 0423type-0, 0423type-1,0423 type-2 and 0423type-3. The results from loading test showed that the box-frame with cross-bars installed on both sides withstand the highest load. If the cross-bar on a single side is replaced with a horizontal-bar, the loading capability is reduced to 78.4%. Furthermore, if the cross-bar is removed on one side, the loading capability is reduced to 55% while the loading capability will be reduced to 6.5% if both sides of cross-bar are removed. Questionnaire survey showed that 74.5% of the construction practitioners are willing to adopt the suggestion of "replacing a cross-bar with a horizontal-bar on single side. Furthermore, 18% of the practitioners expressed strongly their complete willingness to adopt the suggestion. Meanwhile, the weighted ratio is only 45% to 54% on the ability to implement Point 6 of “Box-Frame Operation Safety Guideline and Inspection Key Points”.