Papers by Keyword: On-Site Measurement

Abstract: The accurate measurement of labor productivity data can mean the difference between the success and failure of a building construction project. Due to the sheer diversity and complexity of international building construction practices, minimal research has been performed on comparative labor productivity between countries. In this paper, the authors present a research project that was conducted by comparing the Chinese labor productivity with the U.S. labor productivity in building construction projects. The labor productivity data were collected from different jobsites in the U.S. and China by using a time-study method with established data collection procedures. Furthermore, work sampling in the HVAC system work category was used as a method to gather information about the amount of labor productive and nonproductive work hours spent on construction activities. It is certain that there are many factors affecting productivity in the building construction process. With the lack of timely and effective project quality supervision, construction quality cannot be guaranteed. For this reason, various statistical analysis methods were applied to analyze and compare the collected productivity data from both countries. Findings of this productivity comparison can provide industry practitioners the advancement of knowledge in the Chinese building construction industry and it can support benchmarking and continuous improvement of productivity with a greater efficiency in both the US and Chinese building construction markets.

Abstract: At present, the national norms of temporary support structure in building construction has not officially promulgated. there was no uniform standard in the structure design and construction, which leaded to the collapse of construction accidents occurring from time to time. Through measuring mechanical behavior of support system of coupler, the statics have obtained that loads of temporary support has been gradually imposed on the structure by step construction in the construction process. Construction loading is a complex process of construction mechanics. The measured axial force is larger than standard one by JGJ130-2001. The results shows the load structure suffered has been not fully taken into account. As the load of erecting pole of top and bottom is not the same, the height of structure bearing capacity has been considered in design. As the second-order effecting on structure, both horizontal rod and bridging bear a certain horizontal force in the construction process. The value of bridging stress is larger. In the structure design calculations, the arrangement of bridging should be paid more attention to improve the stability of the entire frame. The obtained results provides experiment basis for support system designed.