Abstract Chinese construction industry has not gained breakthrough and development in quality recently, and studying and application of building information modeling (BIM) is still in a start-up stage. Based on the basic model of BIM technology comprehensively applied in building energy consumption and environment and starting from building design and planning, this study uses BIM technology to assist design of... Chinese construction industry has not gained breakthrough and development in quality recently, and studying and application of building information modeling (BIM) is still in a start-up stage. Based on the basic model of BIM technology comprehensively applied in building energy consumption and environment and starting from building design and planning, this study uses BIM technology to assist design of energy saving and environmental protection of building combining with the relevant theoretical basis of practical application of BIM technology and design of the building itself, in order to present its sustainable effect in building and environment and finally construct green building in a real sense. Read More Read Less

Abstract Damaged steel connection is usually the leading cause inducing steel structure related accidents. It is more scientific and reasonable to analyze damage of steel and steel connections in micromechanical perspective. Gurson-Tvergaard-Needleman (GTN) mode is the most widely applied micromechanical damage model currently; however, it has not been promoted in construction field. Therefore, this study attempts introducing GTN micromechanical damage model... Damaged steel connection is usually the leading cause inducing steel structure related accidents. It is more scientific and reasonable to analyze damage of steel and steel connections in micromechanical perspective. Gurson-Tvergaard-Needleman (GTN) mode is the most widely applied micromechanical damage model currently; however, it has not been promoted in construction field. Therefore, this study attempts introducing GTN micromechanical damage model into study of mechanical performance of building steels. Test specimen taken from Q354 low alloy steels and austenitic 304 hot rolling stainless steel tubes are processed into smooth and notch specimen and then unidirectional tensile test is performed to identify material and damage parameter of two different steel materials. Comparing results with numerical stimulation results, we find GTN damage model is able to accurately predict breaking point of Q345 low alloy steel specimen, but the GTN damage model constructed based on stress-strain relationship stimulated by Ramberg-Osgood curve cannot predict mechanical behaviors of austenitic 304 stainless steels. Read More Read Less

Abstract Based on the analysis of force, impulse and impulse moment in the rebound phenomenon between ping-pong and the table/racket, this paper introduced the concept of critical friction angle and provided a criterion to determine whether it was rolling or sliding between ping-pong and table/ racket so that the physical rebound model was acquired. Besides, a kind of rebound model based... Based on the analysis of force, impulse and impulse moment in the rebound phenomenon between ping-pong and the table/racket, this paper introduced the concept of critical friction angle and provided a criterion to determine whether it was rolling or sliding between ping-pong and table/ racket so that the physical rebound model was acquired. Besides, a kind of rebound model based on multiple linear regression(MLR) was acquired by the knowledge of algorithm. Finally, this paper proved the effectiveness of the two rebound models by parameter estimate, experiment verification and error analysis. Read More Read Less