Advanced Materials Research Vols. 1049-1050

Abstract: Selection of mechanical equipment is realized in the technical study on site. And according to different device powers and flow, relevant piping connections are perfected; then according to proportion of foaming agent developed in the lab, at the scene foaming equipment with compressed air is used to prepare foaming agent with good stability; then according to construction process, different dosage of early-strength admixture effecting the performance of compressive resistence of inorganic solidification foam materials in different time; at last, after the equipment being debugged well and relevant materials being prepared, inorganic solidification foam prepared to be 900 kg/m3 in the experiment is injected into baffle made from wood for solidifying; after 7 days, the dam constructed by this technology is detected with the result that there exists no apparent air leakage, forming a light closed-cell structure. The dam has a good performance of crack resistance and prevent air leakage.

Abstract: Multi-ribbed slab structure (MRSS) is a new structural system developed in recent years, with multi-ribbed slab wall as its main bearing member, which was an orthogonal anisotropic solid constituted by reinforced concrete ribs, frame and embedded solid body. It was suggested to employ asymptotic expansion-based homogenization method to establish the equivalent homogenized model. The method is that it considers the impact of rib relative width and the possion. The research results showed that: the macroscopic constitutive relationship of multi-ribbed wall based by the method has certain accuracy, can provide basis for multi-ribbed slab structure FEM analysis.

Abstract: Based on the differential equation for buckling of deep and long foundation pile, considering the effects of side friction of pile, foundation soil horizontal tension and pile weight. Then the equation is solved by Galerkin Method, the buckling critical load and effective length equation of deep and long pile foundation is deduced. At the same time, the main parameters’ effect to pile buckling stability is analyzed. At last, a practical example is presented, and the calculated result is compared and proved to be feasible.

Abstract: Based on the special section of high fill soggy embankment in Chongqing Steel Plant Railway, we successfully implemented high fill soggy embankment’s dynamic stability monitoring by laying high precision measuring instruments inside the embankment. This stability monitoring reveals the changes and rules of the lateral horizontal displacement, layered settlement, internal stress of this particular form of embankment and provides references for designing and construction for high fill soggy embankment in mountainous area.

Abstract: The traditional elevator can only achieve vertical transportation task in the elevator shaft and can not achieve horizontal movement, which leads to that the elevator can not achieve horizontal transportation tasks in buildings. In order to further improve convenience and comfort of elevator transport, the new structure and operation mode of elevator are studied in this paper. Firstly, two types of building are defined: continuous type and discrete type. Then, based on the classification of building type, the structure and operation mode of elevator with function of vertical and horizontal travel are studied. In order to realize the horizontal movement of elevator for continuous buildings, horizontal motion of whole elevator or horizontal motion of car alone can be adopted. For buildings of discrete type, the feasible scheme is to separately drive the car horizontally run to realize the horizontal travel of elevator. The innovation design of elevator will have some help in the design and study of new elevator.

Abstract: Bending properties and failure modes of sandwich structure with carbon fiber composite M-type folded cores were investigated and presented in this paper. Three point bending responses of both sandwich beams were measured. The finite element method was utilized to determine deformation mode of sandwich beam with M-type folded cores. Cores buckling and debonding have been studied under three point bending and the maximum displacement was also studied using FE-analytical and experimental methods.

Abstract: In this paper, three methods are adopted to excite the activation of gangue: low temperature calcination, milling, and chemistry compound. Using orthogonal design experimental method makes sure the optimum formulation of gangue-lime-sulfate basic system. The study of cement-gangue grouting material shows that mechanical properties and working performance are significantly improved. Significance of widespread use in the future is positive.

Abstract: A process of finish rolling was researched to enhance lamellar tearing resistant of the high-rise building steel EH36. Experimental results indicate that gain size decreased with the decrease of finish temperature. When the finishing temperature on 840/810/780/750°C respectively, microstructure is finest with the size of 11.4μm. Moreover, the size of TiC precipitation turned ideal as the coiling temperature decreased. When coiling temperature is 550°C, the average size of TiC precipitation is only 0.09μm, refined by 40% relative to the conventional process. The microstructure and precipitation phase size of test steel are both effectively controlled because of the improved process. Therefore, high-rise building steel EH36 is finally prepared, and the lamellar tearing resistance reaches up to 78.2%.

Abstract: In the study of bridge pier’s dynamic characteristics, the modal analysis is the foundation of other dynamic analysis and is of great significance for studying other dynamic performance. Based on the dynamic theory of fluid-solid interface coupling, a 3D water-structure coupling finite element modal is established and computed by ANSYS. To verify the validity of the calculation results, the results of finite element software is compared with the analytical solutions in reference books. The analysis indicated that the results of finite element software are reasonable when the radius of bridge pier is five times the radius of water body. The ratio of water depth and the bridge pier’s height has a great influence on the change scale of bridge pier’s frequency. With the increase of bridge pier’s height-diameter ratio, the first three order natural vibration frequency is reduced.

Abstract: It is well known that fires can cause significant damage to reinforced concrete building structures. In many cases, fire would only affect some parts of the building. It is therefore more economical and environmentally friendly to repair the fire-exposed structural components rather than to demolish the whole buildings. In this paper, a summary of experimental study of fire-exposed rectangular reinforced concrete (RC) columns repaired with post-compressed plates (PCP) is described. In the meantime, the design method for this new type of PCP repairing fire-exposed RC columns that can ensure proper repairing details for desirable performance is presented.