Advanced Materials Research Vols. 671-674

Abstract: This study analyze the capacity formulae of the structural members whose stress are the compressing, pure bending and compression-bending, which are recommended in Chinese Unified Standard for The Reliability Design of Building Structure, by the first order second moment method. The analytical results indicate that the reliability indexes of the design formulae can meet the requirements of the Unified Standard for The Reliability Design of Building Structure (GB 50068-2001) for plastic material.

Abstract: This paper presents an experimental method to investigate the attenuation performance of stress waves in concrete structures embedded in piezoelectric ceramics. To get the research objective, a series of test were hold. The relationship curve between the frequency and the attenuation coefficient was fit. The calculation method for propagation distances of stress waves with constant amplitudes and frequencies in the concrete medium was proposed. The research results show that the relationship curve of attenuation coefficient and frequency conform to the cubic polynomial function approximately. The attenuation performance for the concrete structure embedded into piezoelectric ceramics is relevant to the frequency, the amplitude and the medium character, and the frequency is the main factor. The research results of this paper can provide an effective evidence for correctly placing transducers.

Abstract: During construction, some ducts with large diameter should be connected with each other, and then the assistant frame is necessary. The assistant frame is temporary so we need to design the frame with the least material and strength requirement. The paper is based on the weight, dimension and other parameters of the ducts to design the simplest frame to meet the requirement of construction.

Abstract: Similar model experiment under confining pressure, research latticed shell lining the mechanical properties and the carrying capacity of new support for the underground engineering - network shell support, according to the model experiments and theoretical. Test results prove that the the latticed shell supporting structure has good mechanical properties and a high level of support is a reliable form of support. Can make up for the deficiencies of the existing soft rock roadway structure, calculated to provide a reliable basis for mesh shell lining theoretical analysis.

Abstract: The reinforcement project is three-storey of the industries building, the total height of the industries building is 14,200mm, the clear height of one storey is 7,500mm, the building area is 1,500 square meters, structural mode is reinforced concrete frame structure. The structural members were damaged seriously due to fire In January 2010, strengthening the damaged members was proposed in order to ensure the safety of the structure. Enlarging section reinforcement method, Polymer Mortar and gluing CFRP methods were adopt to strengthen the beams, columns and floor slab depending on the damage degree of the concrete member.The idea of dealing with the industries building damaged by fire can provide us a good reference of repairing the similar industries building.

Abstract: For the lack of research in the longitudinal frame of prefabricated structure for its weak lateral stiffness, pushover analysis is conducted to evaluate the seismic performance of a fabricated concrete frame. Based on case study, the strengthening strategies with viscous dampers are analyzed. In view of the undesirable drift distribution and failure mode in the existing building, it is believed that arrangement of dampers should be designed to attain a uniform drift distribution. Based on the nonlinear time history analysis method, the strategy of damper allocation in vertical direction of the structure is investigated .Results indicate that a proper design might be attained based on the property of existing system, leading to a uniform drift distribution and better seismic performance.

Abstract: Carbon fiber reinforced polymer sheet has advantages of light weight, high tensile strength and excellent corrosion resistance [1]. Compared with traditional metal piping reinforcement, CFRP reinforcement method is a new and advanced method. This paper which based on the Lame equation deduce the hoop stress formula of the steel pipelines strengthened with CFRP sheet winding when subject the internal pressure. It is available for the research of steel pipelines strengthened with CFRP sheet.

Abstract: The number of situations where it is necessary to intervene in existing structures is increasing. In Spain, rehabilitation and maintenance of buildings accounts for 30% of the activity of the construction sector and it is growing. This paper evaluates the residual safety of T prestressed joists with severe corrosion at the lower reinforcement. The reliability is assessed with the application of the ACI-318 load test. It is demonstrated that there is sufficient safety in cases of corroded prestressed joists. At any rate, it’s recommended to make a light repair under the damaged joists.

Abstract: Based on the assumption of plane section and linear elastic model, CFRP (carbon fibre-reinforced plastics) strengthening reinforced concrete beam stiffness and deflection have been analyzed in this paper. It is has been solved the problem of such beam’s deflection and stiffness problem in the serviceability limit state, that is can’t be properly calculated with present method, although bearing capacity for the ultimate limit state to this kind of beam is main design aspect. This paper’s calculation formula can guide the relevant components of the design and has been verified by the four root concrete beam’s test results.

Abstract: This paper studied the impact of differential settlement of foundation on the inner force of architectural structure by applying back-analysis method. By taking the three-dimensional coactions system of upper structure-piled raft foundation-foundation with different pile length and different raft thickness as the research object, its differential settlement law of foundation under the effect of load was studied, which was combined with the practical measured data to fit the quadratic settlement surface equation of the foundation. The analysis demonstrated that the differential settlement of foundation will change the inner force of upper structure significantly, thus enabling most of construction components to produce great additional axial force, additional shearing force and additional bending moment, especially changing the additional inner force of corner post more evidently.