Advanced Materials Research Vols. 926-930

Abstract: A novelty configuration of tall building structure, so-called mega-sub controlled structure (MSCS) with friction pendulum bearings (FPBs), which is featured by the FPBs at the bottom of sub-structures, is studied. The seismic responses of the MSCS with FPBs are carried out. The effects of the radius of the sliding surface and friction coefficient on structural dynamic characteristic indices, i.e. energy, acceleration, story displacement, story shear force, are analyzed. A performance comparison is made with the conventional MSCS. The results show that the MSCS with FPBs exhibits a better vibration-control effect than conventional MSCS. The controlling effectiveness of structure with radius of 500mm and 1500mm is better than that with radius of 1000mm and 2000mm. As the friction coefficient increase, the dynamic behaviors of structure tend to increase.

Abstract: The triaxial shear strength of two specimen sizes of poorly-graded gravelly sand mixtures (SF) after removing a portion of the coarse aggregate by method called scalped gradation was investigated. The lower shear strength parameters obtained from small specimens for coarse soils in triaxial testing can lead to uneconomic design. In order to reduce testing costs and utilize more economic designs for coarse soils, small specimens can be used instead of large specimens; in addition, the test results can be corrected. The correlation of the triaxial test results of the two different size specimens was evaluated in this paper.

Abstract: Through a pull-out test was designed, by means of slotted steel strain gauge pasted point detection techniques, and finite element simulation. The load-slip curves between recycled concrete with different recycled coarse aggregate replacement percentage and rebar were recorded. This article studies the impact of different recycled aggregate replacement rate and the anchorage length for the bond strength between the recycled aggregate concrete and reinforced, and provides a beneficial reference for engineering design of recycled concrete structure under similar conditions. Come to the bonding properties of reinforced recycled concrete with recycled aggregate rate increase gradually decrease in the anchorage length sufficient to meet the design requirements, performance depends on the pull-out strength of reinforced recycled concrete and reinforced the bond. Through the finite element analysis software ANSYS, the analysis of simulation results and test results are in good agreement.

Abstract: Methodology to evaluate the permeability characteristic of porous spur dike based on the fundamental theory of permeability is established. The series of flume tests were carried out and the permeability characteristic of porous spur dike was studied through testing of the proposed generalized model. Results indicate that for the porous spur dike with lower capacity of permeability, the generated resisting force when water goes through the spur dike can be divided into the drag force and the permeability force. Given the specific hydraulic condition and pattern of spur dike, the permeability force cannot be ignored, thus the porous spur dike with some permeable capacity can more effectively block the water in-flow compared with solid revetments.

Abstract: Considering the replacement ratio, reinforcement ratio, baked brick aggregate content, SF, superplasticizer content and multiphase fiber composites content, the 13 RAC beams were tested to study the 5 kinds of effects on the bearing capacity and deformation performance. Based on the experimental results, the following conclusions are drawn: the formulas for the bending bearing capacity and shear strength of recycled concrete beams were recommended, and compared with the experiment results, the reliability of the formulas was verified.

Abstract: In order to study the influence of difference between construction temperature and design temperature on structure, an analysis program is compiled based on the beam element and plane shell element. Superposition calculation method is used to calculate the structural response cause by the differences between construction temperature and design temperature in every intermediary stage till the final stage. At last, construction stage analysis is performed on a stiffness skeleton arch with the program, which shows that the influence of difference between construction temperature and design temperature on structure cant be ignored and worthy of further study.

Abstract: In order to study the influence of support horizontal stiffness on a new type of cable arch structure with relatively high headroom, good architectural function and effect, mechanical arch and cable arch models with span of 60m and rise-to-span ratios of 0.2, 0.3 and 0.4 are created, 5 different support horizontal stiffnesses are taken to study its influence on the mechanical performances including strength, stiffness and stability. The results show that the support horizontal stiffness has little influence on the strength and stability of this kind of cable arch structure, but the stiffness will be influenced to some extent by the support horizontal stiffness, so the support horizontal stiffness ought to be considered in the designing and analysis of the cable arch structure.

Abstract: Based on the finite element method and the theory of interaction between beam and rail, for girder bridge and the simply supported girder bridge which are common rail continuous bridge as an example, this establishes on railway line - bridge - bridge pier integration calculation model and analyzes the influence of the type of load and load range on the bending force law.

Abstract: To research the mechanics characteristic of support structure of shallow-buried large section loess tunnel with different construction methods, 3D Numerical Simulation is applied and the large-section loess tunnel of highway is taken as an example. Comparing mechanics characteristic of support structure in three types of construction method conditions, the research results show that:The Benching stepping method which caused large surrounding rock deformation can reduce the value of structural performance. While the Both side heading is just opposite.

Abstract: The process of open-pit mining can lead to high slopes in iron mines, and natural slopes should be rebuilt by the method of roof fall as the exploitation style turns from open-pit mining to the underground mining. So the slope can be steep, deep and may has the characteristics of collapse. It is difficult to describe the stabilization of the mining slope by a conventional safety factor method. Through the numerical simulation of underground mining process, this paper analyzes the result of distortion stress and rock movement rupture range. Studies have shown that the failure mode is dominated by tensile failure as a pattern of collapse and few is dominated by shear failure. The failure zone is controlled by rock mass parameters and structures. The results can be helpful for the proposition of exploitation program and safety management design.