Applied Mechanics and Materials Vols. 496-500

Abstract: According to the vibration in a residential building, a field investigation was conducted. Using the elimination strategy, the primary vibration source was determined, the vibration serviceability of the residential building was assessed by the environmental vibration tests, and the measures for vibration reduction were proposed. The results show that the vibration in the residential building is caused by 5 textile mills nearby, among which, Mill II has significant effect on the residential building. By applying the measures for vibration reduction to Mill II and reinforcing the residential building, the vibration serviceability can be improved.

Abstract: One-way shearing test of the coarse-grained soils and the reinforced earth was carried out under different normal stresses. The one-way shearing curves of coarse-grained soils and reinforced earth are similar. The changed curves of normal direction deformation with the shearing distance of coarse-grained soils and reinforced earth are also similar. Trend of the curve for the normal direction deformation and the reinforced earth is shrink at first and then expand continually. Under different vertical stresses, the difference of the curve for the normal direction shift and the reinforced shift is larger. Compared with raw coarse-grained soils, the cohesive force (c) of the reinforced earth increased, but the angle internal friction (φ) decreased for the reason that the articulation effect between the grilling, and the coarse-grained soils was reduced in the progress of shearing. So, the anti-shearing strength was decreased.

Abstract: In this paper, the multi-span continuous two-way slab is analyzed with finite element method of the secondary moment distribution characteristics. When the support beam size changes, affect secondary moment in the plate. Drawn by the existence of the beam, different size of the beam has a great influence on the board secondary moment values. Likewise, threatening the secondary moment in beam may also be affected. Suggestions in the actual engineering design, not only in the beam slab should be considered themselves times the size of the bending moment, should also be considered secondary moment of mutual influence between beam and slab.

Abstract: Landslide has become the key factor that effects quality, time and safety of a project during construction process of roads and railways in Northern Fujian. The right measures of emergency response and control is very important for effectively controlling disaster, reducing the lost caused by landslide and realizing maximum in economic and social efficiency. Conversely, wrong measures would make the situation worse and even lead a danger to a disaster. In contrast with the existing landslides examples that are similar in develop mechanism, slide pattern and controlling method, the emergency response and control and emergency decision models after investigating previous cases is proposed based on mountain highway and railway landslide, which can be a useful reference to similar landslide control.

Abstract: This study used waste concrete as a recycled coarse aggregate and added an appropriate proportion of groundgranulated blast-furnace slag (GGBFS) to formulate recycled concrete. Based on the recycled coarse aggregate and GGBFS content, 24different mixture ratios were formulated, and then an experimental study of the slumpand compressive strength of the mixtures was conducted. The results showed that because slag can improve the physical and mechanical properties and performances of ordinary concreteand can compensate for certain natural deficiencies occurring in recycled coarse aggregate,GGBFS and recycled coarse aggregate can form recycled aggregate green concrete with a slump of 170mm and a 28-day compressive strengthof 50MPa.

Abstract: Taking Liang Zhuang phyllite tunnel as the research object, the paper tries to analyze the variation rules of formation stress and initial support stress in the construction process based on numerical simulation of surrounding rocks grade III, IV and V, and also by using the measured data to have a better analysis of the stress state of surrounding rocks and support in the construction process, thus to grasp the rules for better construction. The result shows that the maximum compressive stress of initial support increases in the process of excavation, while the maximum formation stress is relatively stable in the process of excavation, with a slightly down trend, and whether there is a rock bolt or not, it doesnt have an obvious effect on the distribution and size of initial support stress.

Abstract: In view of the tectonic background for occurrence of moderately strong earthquakes of the Tanlu fault zone in Anhui Province, methods to combine field survey with literature investigation, and combined with the the damage of rural residence in the previous earthquake, the influences of structure and construction characteristics of the agricultural area in the seismic capacity are elaborated. The weak links of the seismic performance of structure are investigated, and the strategies according to the seismic design of new buildings and seismic appraisal and strengthening measures of existing buildings are put forward. A new seismic technology for foundation isolation is introduced. This method can provide reference for seismic design of the area.

Abstract: Prestressed concrete beam bridge cross-section using T-shaped cross-section. Anti-shrinkage reinforcement requirements adopted under the dense arrangement of all the memorial steel welds are double-sided welding, using a special form of prestressed reinforcement arranged in assembly is completed, tension on the deck to prevent the beam edge cracking.

Abstract: The performance function tends to be implicit or nonlinear in the evaluation of gravity dam reliability, making it difficult to apply some classical methods, such as JC method, Monte-Carlo simulation etc., as they are supposed to be too time-consuming. One possible solution to this problem may be the introduction of artificial neural networks, among which RBF is featured with faster convergence, better precision and can realize global convergence to some extent. In this paper, the application of RBF in gravity dam reliability is investigated, with some examples presented to convince that its reasonable to put it into use.

Abstract: On the purpose of investigation for damping effect of different track supporting, In-situ experiments of vertical ground vibration acceleration induced by underground railway traffic under three track structures were performed at line 8 in shanghai. Time history and 1/3 octave for ground vibration were analyzed and the variation between ground vibration and track supporting structure as well as train velocity was summarized. The results show that reducing vibration effects of different track structure is determined to its own stiffness, various track velocity has little influence to VL_zmax of ground vibration. The study result in this paper has important theoretical significance and reference value for the application of track structure in vibration reduction of subway.