Applied Mechanics and Materials Vols. 94-96

Abstract: On basis of the data from tests, FE nonlinear analysis mode on the multi-planar CHS KK-joints with in-plane gap and out-of-plane overlap (KK-OPOv) was advanced and validated in terms of failure mode, ultimate bearing capacity and etc. And the adaptability is reasonable. Moreover, FE nonlinear analysis for the joint on the typical load-displacement curve, failure behavior, failure mechanism and etc was conducted. The study suggests that the multi-planar KK-OPOv joints appear mainly in the CLD1 failure mode; at the time of failure, the tube wall deformations on the chords of multi-planar KK-OPOv joints and the corresponding planar K-Gap joints are coincide with each other basically. Both of these two types of joints are of a same failure mechanism; the multi-planar parameter ζt influences, to a certain extent, the ultimate bearing capacity on joints. That is, as the overlapping ratio of the out-of-plane braces is higher (namely, the absolute value of ζt increases), the ultimate bearing capacity of the joints decreases.

Abstract: After billions of years of evolution, the form, structure, function, behavior and other aspects of living things in the nature have been optimized, designers imitate this advantages to make the bionics melt into structure, then biomimetic structure came to being. On the basis of some examples, this paper establishes two different classification methods of biomimetic structure--according to different imitating objects and different imitating aims, and presents the conception of form-finding bionics, takes tree structure as an example to analyze.

Abstract: For the analysis and design of RC structures, there is a fundamental assumption that the strain in an embedded reinforcing bar is the same as that in the surrounding concrete. Therefore, bond forces must be developed on the interface between concrete and steel, such as to prevent significant slip from occurring at the interface. An end anchorage may be considered reliable if the bar is embedded in to concrete a prescribed distance known as the development length of the bar. If in the beam the actual extended length of a bar is equal to or greater than this required development length, no premature bond failure will occur. Research has indicated that the development length was influenced by tensile strength of concrete, surface and diameter of bar, cover distance, bar spacing, transverse reinforcement, and other factors. Current design methods in different countries’ Codes, attentions are directed toward providing adequate length of embedment, which will ensure development of the full strength of the bar.

Abstract: Taking the example of the high slope treatment of JINPIN Hydropower Station of YA LONG River, in this paper the basic requirement，construction feature and forcing characteristic of the fastener steel-pile scaffold were introduced in detail, the scaffold setting up method of the working platform in slope treatment are designed, and the loading analysis, checking computation of the strength, rigidity and stability of primary members were making. At last, this paper adopted corresponding construction measure as per the uncertain factors. This paper can provide the design basis and reference for the similar scaffold engineering by the practice of this project.

Abstract: Designing the reasonable cross-section and the structural conformation, three Reactive power concrete box piers samples were designed and studied under the constant axial force and reversed horizontal loads. The effect of the reversed horizontal load on the seismic performance of RPC box pier was studied. Such seismic performance as ductility, hysteresis curve, skeleton curve, etc. of RPC box piers is studied by pseudo-static test on three RPC box piers. The simulation results shows that RPC box piers exists excellent performance of resisting seismic force, the direction of horizontal load significant affect that performance, and the performance of resisting seismic force for the pier loaded by the force from main axial direction are better than that from other direction.

Abstract: Staircase units have both active and hazard impacts on whole structure under earthquake. The existence of these impacts should not be neglected during designing process. Three sets of nonlinear finite element (FE) models of different types are finely built with and without staircase units, upon which dynamic earthquake analysis and pushover analysis are carried out to simulate the real earthquake disaster. Comparisons of overall properties, pushover performances, seismic response and internal force of elements are summarized and discussed between two models of a set. Potential dangerous elements are found while the reasons are generalized. Suggestions upon designing process are given as well.

Abstract: It is very difficult to control diaphragm wall deformation in 30mm, the project which depth 25m, long side 530m, and the sounding environment is complex. Tianjin Station transportation hub project attained the requirements of control on the ground settlement around foundation, the settlement of buildings and structures. We have comprehensively analyzed the field monitoring data and the three-dimensional numerical simulation, and obtained deformation of the surrounding environment and control of variation Index for this type of foundation.

Abstract: Abstract：Twenty-one RC columns were made, including nine RC columns wrapped with BFRP, nine RC columns wrapped with CFRP, three RC columns without any reinforcement, to conduct the comparative study of axial compression. The result shows that the bearing capacity of the RC columns reinforced with the fibers increases obviously. The bearing capacity of the RC columns with CFRP is higher than that with BFRP, but the difference is not obvious. The displacement ductility factor increases, but its increase rate becomes slow with increasing layers of fiber cloth, so the most economical layer number is 3. Based on the confinement mechanism of FRP cloth and the calculation formula of the bearing capacity for common RC column, the formula of the bearing capacity for reinforced RC column with BFRP cloth is proposed. The result of calculation basically tallies with the number in experiment.

Abstract: By the method of plane charge on the tested beams, this paper studied 6 pieces of beams， dynamic performance by 4 time loadings, displayed the deflection waveform curves, measured the bearing ability of beams with different prestress degree, analyzed the effects of the deformed performance and the ductility of the test beams with the different prestress degree. The 6 pieces of PC（prestressed concrete）beams was divided into 2 groups.

Abstract: Bamboo-steel composite structure contains all kinds of composite structural members, widen the applied range of bamboo and implement the diversification of component materials and forms in building structures. The paper presents a new-type box section bamboo-steel composite beams on the basis of I-section bamboo-steel composite beams, which take cold-formed thin-wall steel as the backbone, pastes bamboo plywood outer surface of steel sheet with structural adhesive, combines into box section bamboo-steel composite beams.