Applied Mechanics and Materials Vols. 166-169

Abstract: The dynamic testing of stress wave reflection method is an easy, economical, rapid and reliable nondestructive testing technology and has been perfected used in the pile foundation dynamic testing. Anchor rod is more in line with the wave theory of one-dimensional elastic rod than pile foundation whether to theory or the geometric solid, material, stress state and other factors. The quality of anchor rod is determined by using small strain method (hammering method) of pile foundation dynamic measurement. Four testing anchor rods with different length and integrity were made in project of "China Marine Sport School", stress wave time domain curve of anchor rod was obtained by ZK-7E portable intelligent testing of piles instrument, defect location, length of anchor rod and integrity reflected by measured waveform are consistent with the actual situation, the method using pile foundation dynamic testing technology for anchor rod nondestructive testing is proved feasible and reliable.

Abstract: In order to study the mechanical behavior of joints in the castellated portal frame of light-weight steel under static loads, a static loads experiment has been performed for these new joints in this paper. The experiment members include four castellated joints and one solid-web joint of original steel, considering three vary parameters which are connection form of joints, joint region with setting stiffener and the distance from the center of hole to joint region. Experiment shows: the stiffness of castellated joints is higher than the one of solid-web joint. The parameters have a great influence on the mechanical behavior of joints, except the connection form of joints.

Abstract: In this paper, beam ends of beam-slab-column joints installed in reinforced concrete structures are simulated using ABAQUS FEM analysis software. The simulation work is carried out under the monotonic loading. The damage factor in the plastic-damage model is adopted for describing the damage state of concrete. The failure characteristics, the distribution of cracks on the top side of slab are discussed according to the simulation results. The stresses of longitudinal bars in the slab along with different distances between the longitudinal bar and the beam are given. In reliability assessment of the numerical model, the effects of slab thickness and slab reinforcement ratio on flexural behavior of beam-slab cooperative working are conducted further more.

Abstract: Base isolation is an effective measure of anti-progressive collapse in frame structure. This article contrastive analysis the earthquake resistance of structure which have isolation bearings and which have not isolation bearings by the use of static analysis, and then use the discrete element method to establish simplified model about the system of base isolation. It also research the isolated effect under horizontal seismic force after the middle column failed .The conclusion that we get in this paper have practical significance in engineering.

Abstract: Framework-shearwall structure is a dual resistive system to lateral force, which should have reasonable arrangement of shear wall thickness and quantity. The thickness should be decreased successively along the height of a building so as to adjust the internal force and deformation of the framework and the shear wall, and give full play to each of their advantages under stresses and finally achieve the purpose of safety and economy.

Abstract: In order to study the vertical tension properties of laminated rubber bearings under different shear strain, pure tension test and shear-tension test on two groups of natural rubber bearings and lead core rubber bearings with 800mm diameter are present in this paper, and the initial stiffness, yield stiffness and yield stress and ultimate tensile properties (limit stress, limit strain) of the rubber isolation bearing in different shear strain are analyzed. The results of the tests provide the reference for the application of rubber bearings on large-scale complex structures or high building structures.

Abstract: In this paper, the finite element model of a steel jacket scale model is updated using modal parameters identified by modal test. Updating parameters are selected based on sensitivity analysis by solving modal energies. And then, a two-steps updating process is carried out using different parameters and the Cross-Model Cross-Mode (CMCM) model updating method is applied in each step. Results indicate that with selection of updating parameters and sensitivity analysis, CMCM method can update the finite element model with physical meanings.

Abstract: Hydrologic Model is the basic tool of simulation of the runoff generation and confluence of the basin. It is widely used in the research of hydrologic process of the drainage basin. In this paper, the characteristics of SWMM Model and Tank Model were introduced. The SWMM-Tank model was established that combined with advantages of the SWMM and Tank model. This model was used in hydrological simulation of the Big Ning river basin. The Surface and Underground runoff was simulated respectively using the SWMM model and Tank model. The simulation results show that the SWMM-Tank model can meet the requirement of accuracy and the combined model is simple. The combined model can be used in hydrologic simulated of the drainage basin that the underground information is lacked.

Abstract: The paper proposed mechanics analysis model to simulate the working patterns between steel wires creatively, established and optimized the finite element model to analyses the bending stress preferably and analogue simulate the layered-slipping condition intuitively.

Abstract: Steel plate-light weight concrete hollow composite deck was a type of novel composite deck which composed of steel plate, perforbond ribs connectors (PBL connectors) and light weight concrete and steel pipe. In order to understand the hollow composite decks mechanical performance, Static experiments of five specimens of this hollow composite slabs were conducted, among which two specimens were composed with longitudinal steel pipes and three specimens were composed with transversal steel pipe, with the aim to study the difference of the mechanical behaviors of the composite decks at the two orthogonal directions. Based on the experiment results, the effects of the direction of steel pips and the nominal shear-span of the slabs on the composite decks mechanical performance were especially studied. During the experiment process, the failure modes, strains of concrete and steel plate, cracking type, slippage of interface and the bearing capacity of the decks were studied in detail. From the experimental study, it could be found that there were no slippage between the steel plate and concrete were measured at the composite bridge decks, and the composite bridge decks showed high flexural rigidity, good ductility as well as better bearing capacity with the strength of bottom steel plate and top concrete both fully utilized. Therefore, it could be concluded that this type of composite bridge decks have good advantages at mechanical behaviors.