Applied Mechanics and Materials Vols. 744-746

Abstract: Chinese traditional timber structure is the most direct embodiment of splendid building culture, it is always known for good structural integrity and good seismic performance. However, due to the influence caused by the timber structure itself and many factors of the outside world, that often make the structure suffering different degree of destruction after using a period of time. In this article, we through the analysis of general form and cause of the destruction, research on strengthening technologies of traditional timber structural dwellings in Shennongjia region, to provide some ideas and thoughts for people who want to renovate and strengthen traditional timber structural dwellings.

Abstract: Past three decades have seen the rapid development of high strength steel (HSS) in its application in structural engineering. However, so far the mechanical performance of a HSS beam-to-column connection has not been systematically studied, especially for bolted end-plate connections, the commonly employed beam-to-column connections in steel structures, which could restrict the application of HSS. Therefore, this paper aims to represent the basic methods, current achievements, recent applications, and the existing problems that lie in the way. In doing so, this paper is composed of three parts, experimental results, numerical analysis as well as component method. At the end, this paper indicates that future investigation should be based upon experimental analysis and proper finite element modeling, to verify a numerical model and to refine design standards.

Abstract: The timber-concrete composite (TCC) beam is a new type of structural member, which formed by combing a timber beam and an upper concrete flange using different types of connectors. Compared with the traditional timber beam, the bending and stiffness of the composite beam is proved. In composite structure, the important factor of the structure is the shear connector. So structural efficiency of a TCC highly depends on the stiffness of the interlayer connection. This paper presents a survey on the state-of-the-art of shear connectors for TCC beam research in the past and recent years. And put forward to the subsequent study of shear connectors in TCC beams.

Abstract: Coupled eco-composite wall is one of the most commonly used lateral-load resisting member in eco-composite wall structure. The test of a coupled eco-composite wall under low-frequency cyclic loading is carried out to study the seismic behavior of the coupled eco-composite wall. At the same time, the main influencing factors of shear capacity for the wall are analyzed by numerical simulation. Experimental results and numerical analysis show that: the coupled eco-composite wall has better seismic performance in contrast with the standard wall, and such factors as shear-span ratio, ribbed steel bar, block strength, section height and reinforced area of end column and concrete strength of end frame column are the main influencing factors of shear capacity 。

Abstract: Inner transverse prestressed bars were used to enhance the shear capacity of concrete beams in this paper, which can be used in transformer beams to reduce the sectional size. Two transversely prestressed one ordinary concrete beams were tested and calculated by finite element method, and the following conclusions can be drawn: (a)The shear capacity of transversely prestressed concrete beam increase rapidly with the increase of the prestressing force level, which means that prestressing force level has a great influence on the shear capacity of transversely prestressed concrete beam. (b) The transverse prestressing bars can efficiently enhance the anti-crack performance of the reinforced concrete beams.

Abstract: To overcome the shortcoming of unreinforced masonry (URM) structure, structural columns are added in its construction to avoid the sudden collapse. This kind of structures still suffers different degrees of damage in the earthquake. This paper assesses the in-plane shear behavior of masonry walls with structural columns retrofitted with FRP (fiber reinforced polymer). The tests of two half-scaled masonry walls under cyclic loading have been carried out. One wall was served as reference specimen without any retrofitting scheme. Another specimen was tested to the pre-defined damage level and then strengthened with FRP sheets in mixed retrofitted configuration. The shear behavior of retrofitted specimen was discussed and compared with the reference in the aspect of lateral shear strength, maximum displacement and energy dissipation.

Abstract: For computation of reaction, internal force and displacement of a beam, the displacement equation from Conversion Method is used in establishing compatibility condition of deformation. In the process of Section-Conversion Method, the joints without sway is set as the coordinate criterion. Cutting the part between two joints as a base element with the method of section, it becomes a simply supported beam in form. The internal forces at the section cut are those which equivalent forces from other side of the beam. According to the axiom of action and reaction, the equivalent forces react to the other part of the beam. The displacement equations are used for all parts one by one. The precision resolutions of reaction, internal force and displacement of a beam are achieved.

Abstract: In order to study the static performance of a new type e vertical prestressed steel structure called mega steel frame-cable bracing structure, structure deformation, internal force of beam and column and the remaining pretension of cable under pretension, vertical load and horizontal load alone as well as pretension with vertical load, wind load combination condition were analyzed in this paper. Research shows that prestressed cable can effectively improve mechanical and deformation performance of mega beam under vertical load, improve the system stiffness and make the overall stiffness more uniform.

Abstract: In truss-steel plate shear wall (SPSW) structures, the main role of SPSW is to provide horizontal and vertical stiffness for the system, which requires the SPSW capable of adapting to bi-directional loading. In order to satisfy the goal, stiffeners need to be added to the SPSW. In addition, openings are usually set within the SPSWs to meet certain architecture or utilization needs. Stiffener design criteria for such SPSW with or without opening are first derived according to the principle of yielding before buckling and local buckling before overall buckling. Then the deduced stiffener design criteria are compared with the current design codes. Finally the stiffener design recommendations are proposed for SPSW with or without opening adapting to bi-directional loading.

Abstract: Based on Ježek method of computing the elastic-plastic buckling of the members under the axial compressive load and the bending moment, considering the initial imperfection, the analytical expressions of calculating the ultimate load of buckling about the neutral axis with the maximum moment of inertia for an H-shaped member and a square steel tube member are derived. Using the elastic-plastic finite element method and the theory of nonlinear buckling, the impact by initial geometric imperfections on the H-shaped steel member and the square steel tube member under the axial compressive load and the bending moment are analyzed and the numerical solutions of ultimate bearing capacity are obtained. By compared with the values of the finite element method (FEM), it shows that the analytical method in this paper is valid. The results of the example show that the presence of initial imperfections reduces the ultimate bearing capacity of the two kinds of steel members to a great extent. It is also found that the influence of the initial geometric imperfection on the ultimate bearing capacity of members is smaller when the bending moment increases.