Papers by Author: Chang Ming Hu

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Authors: Chang Ming Hu, Feng Yun Liu, Jia Ling Che, Yun Bo Zhao, Qiong Wu
Abstract: The template system, the mould of fresh concrete, plays an important role in the concrete structure construction. At present, in the process of steel template concreting in axis rotating structures, the template system adopts the traditional construction technology of formwork with scaffolding; thus, the template can not withstand the loop force, hence difficult construction and safety hazards. Aimed at the deficiencies in template system design, a new kind of steel template that can bear loop force has been designed with the software ANSYS. Taking a rotating structure as an example, this paper, based on the stress test of the structure, has analyzed the distribution and change of the stress under the steel template construction. The results show that the design of the template is reasonable and that it is also applicable to similar structures.
Authors: Fan Kui Zeng, Chang Ming Hu, Xing Cai Liu
Abstract: The uniform design standard of temporary support structure in building construction has not been published, In case of coupler steel pipe support system, characteristics for the temporary support structure, the standard structure of the system is proposed. It is suggested that the design of temporary support structure should be combined with the present theory of the design of steel structure. The design method of temporary support structure based on equivalent notional lateral loads is proposed. The formula is given, which is verified by tests and is compared with the formula recommended by the present code. The result shows that the formula can meet the requirements of the safety factor, which provides a reference for those concerned with research, design or construction.
Authors: Yuan Mei, Chang Ming Hu, Xue Yan Wang
Abstract: Taking one foundation project as an example, a series of tests are carried out to study the dynamic compaction parameters and its effects on the deep collapsible loess foundation under super high fill in Lvliang region. Analyses are made on the average settlement of each test area before and after dynamic compaction and on the regularity of the main physical and mechanical indexes of soil. At the energy levels of 2000 kN•m, 3000kN•m and 6000kN•m, the main parameters are gained, such as the effective reinforcement depth, the centre distance of tamping points , the standard of stopping ramming, and the optimal ramming number; hence, the empirical formula of the effective reinforcement depth of dynamic compaction. The results of the tests show that the deep collapsible loess foundation in Lvliang region can be effectively reinforced by dynamic compaction, that the stability of foundation is good, and that the loess collapse in the reinforced range is eliminated basically. Moreover, after dynamic compaction above the energy levels of 2000 kN•m, the eigenvalue of the bearing capacity of collapsible loess foundation in Lvliang can reach over 300kPa; the deformation modulus of foundation soil is more than 25MPa. Therefore, the results of the tests can provide a reference for the design and construction of projects of the same kind; it can also provide a reliable basis for relevant norms and standards.
Authors: Chang Ming Hu, Li Fang Wang, Hong Liang Liu, Jia Yang Zhu
Abstract: Taiyuan is a city with more moutains, less loess resource and abundant coal gangue. This paper studied the feasibility of turning coal gangue into filling in Taiyuan region, based on successful experience home and abroad. A series of tests on physical-chemistry properties and mechanical characteristics of the coal gangue proved that coal gangue used in the experiment has good chemical properties, grain composition. The coal gangue is a kind of non-sticky coarse grained soils which can drain off water freely, and it can be used as the filling of foundation. Based on tests, this article provided a theoretical basis and a favorable reference for engineering application of coal gangue and its research and development in other areas.
Authors: Fan Kui Zeng, Chang Ming Hu, Xing Cai Liu
Abstract: A reinforcing method is introduced, concerning the inclined and cantilever features in the structure of the Palms together dagoda in the Famen Monastery and the cracking in the floor slab of 54 meters high. According to the actual situation, the welding of the strengthened metal and the structure on the nodes is difficult to achieve. In order to make some improvement, we use bolt connection run throng the wall body instead of steel belt and steel bone welding, which will make the transmission of the structure more clear, shorten the construction period and ensure the engineering quality effectively. This method can also be used for the reinforcement in concrete structures of large span and tall buildings. Therefore, the discussion of processing technology dealing with the combination of the structural cracks in floor which this article focuses on, has some reference value on similar projects.
Authors: Chang Ming Hu, Yan Guo, Jie Wang, Qiong Wu
Abstract: An underground club in Xian is taken as the research object to explore the mechanical response of the internal poles of its high formwork support system during concrete pouring. The internal force static measurement of the high formwork support system is carried out. Each stage of the concrete pouring is simulated by the finite element analysis software ANSYS in the form of load step, whose results are contrasted with the measured results. The contrast reveals that the concrete pouring sequence has direct influence on the tendency of poles axial force and on the location of maximum axial force and that it is reasonable to adopt imaginary horizontal force which simulates the initial defects to carry out the overall stability analysis of the high formwork support system. It is pointed out that the program of setting up the formwork and the concrete pouring sequence should be determined with the finite element analysis.
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