Advanced Materials Research Vol. 1021

Abstract: A deep excavation in Hefei is proposed in this paper. Some useful conclusions are drawn through the analysis of the measured results including displacement of retaining structure, axial force of horizontal support and settlement of the surrounding buildings. It is useful for design, construction of similar engineering.

Abstract: According to the building settlement monitoring around the base pit, research the deep base pit excavation impacting on the surrounding buildings. Take Hefei subway station base pit project as example, by way of an adjacent residential building whole process of excavation monitoring, research the impact of deep excavation on the surrounding buildings. Timely feedback to the construction unit, to ensure the smooth construction of pit, and provides a reference to design and construction of deep foundation pit.

Abstract: Raft foundation was researched in this paper,basing on the traditional “Wang Tiemeng Method”,the influence of temperature stress calculation by radiation condition was put forward emphatically. According to analysis the two calculation results, obtains the more precise temperature stress calculational method. Consequently the of concrete crack calculation and analysis result can be more precise and reliable.

Abstract: Due to the development of the computer hardware and the difficulties in determining the constitutive relation, it is difficult to research the crack propagation of large-scale masonry with the finite elements analysis method. The paper analyses the single storey concrete block masonry experimental model with the software LS-DYNA, using winfrith concrete material model instead of masonry material. And the calculated results were compared with the test results. The comparison indicates that the crack propagation of masonry can be simulated better with winfrith material model, which can be used in the finite elements analysis of large-scale masonry.

Abstract: Sealing property of threaded connection in gas storage wells is of great importance to the safety operation condition of CNG filling station. Indoor leakage tests of threaded-connect pipes are conducted and mathematical models to calculate the axial and thread contact stresses are established. Moreover, finite element analysis is used to figure out the maximum equivalent Von Mises stress in threaded connection. The results show that strain and stress of tested pipes have the linear distribution regularity. Also, it can be seen from the stress nephogram that the first to fourth pairs of threads bear 40% of the whole load and if the first pair has slip phenomena, other pairs of threads would be affected easily which leads to the possibility of gas storage well leakage.

Abstract: Dynamic test method is a more accurate method of indirect nondestructive testing. The dynamic characteristics of the buildings is obtained by dynamic response of high sensitivity under external excitation vibration pickup structure. The test of a reinforced concrete frame shear wall structure of a complex building was carried on as an example, and the evaluation of the overall performance of the structure was made through the test results.

Abstract: Studying on a cross section column of reinforced concrete special-shaped column frame structure with finite element analysis, mechanical process from loading to destruction is obtained, then fracture mechanism category, node failure destruction mode and deformation mode of the joint core, which provide certain theoretical basis on the property damage type of special-shaped column and cross section design.

Abstract: In the program, dynamic experiments were carried out on two scale models of the recycled tires-asphalt sands (RT-AS) base isolation device. The device consists of recycled tires and the mixture of asphalt and sand at the ratio of 3:1 in weight. Since the tires consists of rubber, the elastic deformation can consume energy, and for asphalt-sands , the friction between sands and the elastic deformation of the mixture of asphalt-sands can also consume energy, RT-AS base isolation device can help the superstructure consume part of energy from seismic wave. In this way, the device can not only can protect environment through recycling worn tires, but isolate the structure from the shaking ground and decrease the damage to the superstructure. To investigate the effectiveness of a new seismic isolation device (RT-AS),two scale models of one-storied masonry structure were built up according to the ratio of 1:12. During the experiment, The WE-Z30 Precise Mini-seismic Shaking Table System was employed with the seismic wave of the earthquake in Wen Chuan in 2008 according to the record of NS direction of Shifang seismographic observatory, The experiment was conducted under three level of vibrating load using vibration exciter, and the positive effect of RT-AS device on reducing the acceleration response of the building was discussed.

Abstract: Using supplemental energy dissipation devices into the structure to increase the damping ratio for reducing the responses of seismic activity has become more and more popular. This paper presents a case study of seismic retrofit strategy, utilizing a type of passive energy dissipation device, namely, the viscous damper, in order to make an ongoing chips produced facility resistant to seismic activity. The building in question was a chips produced facility belonging to a semiconductor manufacturing company. This was a double FAB where the structure system was divided into an island building and an RC shell. The retrofit involved installing 44 non-linear dampers between the island building and the RC shell. This was due to the significant differences in the fundamental vibration periods. This paper will present the rationale of making a decision on the parameters of the dampers to give the optimum retrofit strategy.

Abstract: In the study, as an attempt to apply to the general low-rise structure among the developed SC structure systems for special structure, a usability test was planned by replacing the existing concrete of SC structure with red clay (Hwangtho) for weight lightening and eco-friendly structure with less carbon dioxide. Also, a comparison between the test result and the domestic standard KEPIC-SNG was made. As a result of the test, compression strength of the red clay added specimen showed 4~20% more stable result compared to the KEPIC-SNG.