Applied Mechanics and Materials Vols. 501-504

Abstract: It is the load on the crane beam and the conditions of the welding that influence the stress round about the support crack between the web and the upper flange of a welded steel crane beam. Using finite element analysis software ANSYS, the stress of the welded steel crane-girders subjected to different eccentric wheel loads were analyzed. Cycles of eccentric wheel loads is the main reason to lead to the support crack appear. Some measures are put forward based on the discussion.

Abstract: The performance of spiral wound gasket with different angle of V-type steel belt is researched, which includes effect of angle of V-type steel belt and pressure on compression rate and rebound rate. The results indicate that, when the pressure is same, the compression rate of spiral wound gasket decreases and rebound rate of spiral wound gasket increases with the angle of V-type steel belt increasing. When the angle of V-type steel belt is different, the optimum preloading need adjust in order to spiral wound gasket work well. For spiral wound gasket DN80, the optimum pre-pressure should be controlled within 45~55 MPa when angle of V-type steel belt is 80-degree, and the optimum pre-pressure should increase with angle of V-type steel belt increasing.

Abstract: Recognizing that PBL shear key in all aspects of civil engineering play an increasingly important role, firstly, to do a simple analysis and discussion on the ultimate strength of PBL, followed by the use of MIDA FEA finite element model was established, then its static power loads such as displacement and stress are analyzed and compared. In the final PBL shear bond stress at critical locations and displacement in different conditions is calculated.

Abstract: At present, the development and application of new building structures are paid widely attention. In order to promote light-weight building slabs, different sections of steel-bamboo composite slabs are presented in this paper. Sandwiching thin-walled C-shaped steel or profiled steel sheet between two bamboo woods and bonding them with adhesive, a variety of different forms of steel-bamboo composite slabs are designed. For the C-shaped steel composite slabs, the reinforcement of self-tapping screws can effectively constraint interface slip between steel and bamboo plywood. It can also overcome the shortcoming of buckling which easily happen on C-shaped steel, ultimately, making the slabs have high stiffness and bearing capacity. The composite slabs with profiled steel sheets as the core part are strengthened by self-tapping screws and edge panels. And the global stability, deflection capacity and ductility performance of composite floors are significantly improved. Experimental results show that the reasonably combined composite slabs which have good combined effects, large carrying capacity and stiffness, can be used as architectural floors.

Abstract: This paper analyzes the influence degree of related design parameters of wire-mesh frame wallboard on deformation through finite element program, providing theoretical basis for the design and test of steel wire rack energy-saving wallboard.

Abstract: The collaborative work between FRP plate and concrete is achieved through the binder, so the interface of them is the weak links. Under external loading, the relative slip occurred on the interface between FRP plate and concrete causes the redistribution of stress and then the bearing capacity of the member will be reduced. Especially the FRP plate is a kind of resin material and its physical and mechanical properties will change with temperature and time. Based on energy variation principle, the differential equations of interfacial shear stress meanwhile to considering temperature and creep effect of concrete beams strengthened with FRP plate are established, in which the strain-energy of concrete beam, FRP plate and glue layer are calculated. And the calculated formulas of interfacial shear stress for a single point load are given.

Abstract: Fatigue damage of guyed mast earplate welded joint is one of the main failure forms of guyed mast under wind load, and the welding residual stress is a important influence on fatigue performance of the welded joints, therefore, accurate welding residual stresses assessment of earplate welded joint is of great significance to the research on fatigue performance of guyed mast earplate welded joint under wind load. In this paper, welding temperature field of earplate welded joint was simulated by using thermal finite element method and the gauss heat source was used as thermal input. Then, welding residual stress of earplate welded joint was simulated by using thermal elastic-plastic finite element method and the temperature field results were used as the load. The welding temperature field simulation results better reflect the locality of heating, mobility of heat source and instantaneity of heating and cooling process during the welding process. The welding residual stress simulation results show that the residual stress peak of earplate welded joint reaches the yield strength of material, and appears at the dangerous point of earplate welded joint under structural external load. This point under influence of the welding residual stress and structure load is likely to be fatigue crack initiation location.

Abstract: Double inner and outer latticed shell string structure is a new type of space structure. The new structural system is to reduce the space occupied by roof structure and could be laid by the rigid roofing material conveniently. Based on the local analysis method and the whole system balance, a numerical algorithm was introduced and some suggestions for improvement were put forward. An example was investigated and the results confirmed the feasibility of the proposed method.

Abstract: According to the national standard "Code for Design of Concrete Structure", the reliability index for the structural members of reinforced concrete have not been given, which are controlled by serviceability limit states. A methodological framework was proposed, which made use of fuzzy invalidation rule for reliability analysis of reinforced concrete members. Firstly, A membership function was chosen. Secondly, A equivalent function was established to deal with the fuzzy reliability of concrete structure by traditional JC method. Finally, the fuzzy reliability index of transverse crack of reinforced concrete structure was obtained.

Abstract: A nonlinear analysis program for the capacity of +-shaped columns with numerical integral method is complied. Using the program, the Date of Mx-My curves under different axial compression ratios is obtained for four different reinforcement of equi-eimb +-shaped reinforced concrete columns. The maximum moments in various loading angles are analyzed, the cross-sections ability to bear load influenced by different reinforcement is discussed, The rational reinforcement of equi-limb +-shaped reinforced concrete columns is derived. The date shows that the theoretical values and experimental results meet closely. Finally, Some suggestions in practice design for equi-limb +-shaped columns are given.