Applied Mechanics and Materials Vols. 578-579

Abstract: Based on the eccentric compression performance testing of the out-of-planes of 4 pieces of different pre-stressed composite masonry walls with holes and constructional columns, the pre-stress’s influences on the horizontal and vertical transmission and distribution, emergence and development of cracks, deformation of the components and fracture morphology and mechanism of the section stress along composite wall with holes are revealed. The testing shows that the pre-stress not only improves comprehensively the load-carrying properties of composite wall, but its fracture mechanism and mechanical model are the same as that of the non-pre-stressed composite wall, so that the same design approach can be used. And it provides further experimental basis to supplement and improve the basic theory and computation methods of eccentric compression of composite wall’s out-of-plane in the current masonry structure specifications. Only crack resistance and bearing capacity are studied in this article.

Abstract: It is great significance for the design and construction of similar beneath engineering to study the multiple pre-top bracing technology in the subway close-attached undercrossing engineering. In this paper,taking the Beijing 10-line New Gongzhufen station close-attached undercrossing the existing Subway Line 1 Station as background, explored the application of multiple pre-top bracing construction technology, and designed a new kind of top bracing platform system, studied the application of multiple pre-top bracing construction technology in the large span of close-attached undercrossing engineering.

Abstract: The mechanical behavior of RC beam strengthened with CFRP by anti-arch method and directly pasting CFRP through model test is analyzed. It explains that the reinforced RC beam with CFRP by anti-arch method can solve the influence of beam's loading by the secondary stress which exists in the method of pasting CFRP directly in strengthening RC beams improve the beam's load when it cracks and the carrying capacity, and decrease the deflection deformation and crack width and gap when the beam carries load. It can make the most use of high strength of tensile properties of CFRP.

Abstract: In the process of steel structure construction, it was inevitable that the members of structure had initial imperfections which might decrease capacity of the structure. In order to consider the influence of lateral deviation of beams on rigid joints transferring forces outside box columns, in this paper 4 specimens were designed to compare the performance of joints with force-transforming plates to traditional joints by finite element method program ANSYS. The results indicated that adding force-transforming plates could transmit stresses to beams which were far from the panel zone, to avoid joints’ stress concentration. Moreover, in the same case, when the beams were imperfect, the yielding capacity and ultimate carrying capacity of the joints with force-transforming plates were significant higher than those of traditional joints. Moreover, the adding force-transforming plates were helpful to reduce the influence from the beams imperfect. This kind of joints can be used to the practical engineering.

Abstract: This paper aimed at a tall frame-shear wall structure contains multi-short columns, and did pushover analysis to this structure with finite element software, and evaluated its seismic performance under rare earthquake in seismic intensity of 6 degrees. It concluded that the structure can meet the "earthquake does not fall" seismic requirements, and will not appear the cut destruction of shear frame short columns, and can achieve "strong column weak beam" design requirements.

Abstract: In this paper, the stability analysis of a single-layer latticed shell structure is presented using ABAQUS, with the geometric nonlinearity considered. The load-displacement curves are calculated according to the elastic and elasto-plastic hypothesis respectively. The ultimate bearing capacity of the structure and its conceivable damage mode are estimated. Finally, the nonlinear stability of this structure is assecced and the further suggstions for improving the structural performance are presented.

Abstract: To study the distribution of stress in a dam with rectangular section under water, the dam was simplified a rectangular structure with limited length. Based on the theory of mechanics of elasticity a stress function was deduced which was used to calculate the stress and displacement in any point of the dam. The results show that the normal stress along the length direction was not equal to zero, but the strain along the direction equal to zero.

Abstract: The "box structure" is a building system which was highly prefabricated and assembled. Taking the "box structure" residence as an example, the static and dynamic performance is discussed and finite element analysis software ANSYS is applied to verify "box structure" design ideas.

Abstract: The external post-tensioning technique has been commonly used in the construction field because it facilitates the analysis of structures and is widely applicable for many types of structures. In this research, 12 steel H-beams were built and tested in terms of the amount of tendon or prestressing force. The results show that the externally prestressing method can increase ultimate bearing capacity of the beams. The prestressing force is the significant factor that influence the strengthening of steel H-beams. However, the amount of deviators cannot significantly influence the bearing capacity.

Abstract: The same two straight mortise-tennon joints in the base of melon-column (SJ for short) and penetrated mortise-tennon joints (PJ for short) were made with related rules. Relations of moment-rotation, length of the tenon pulled out-rotation and failure modes were got through monotonic loading test. Experimental study showed the main damage type of SJ was pulling out, while two damage types of PJ were bending damage and transverse tearing failure respectively. When under the action of bending moment, the resisting torque of SJ was synthesized by vertical load of columns, while that of PJ was mainly synthesized by local compresssive stress and friction on upper and lower surface of the tennon. In addition, the pulling size of tennons was associated with the heigth of tenon and relative rotation of beam and column.