Papers by Keyword: Flexural Rigidity

Abstract: In the construction industries, in order to compensate material disadvantages of existing construction material (concrete, steel, wood, etc.) and satisfy requirements of the structural performance, research on durable and outstanding corrosion resistant fiber reinforced polymeric plastic (FRP) is actively underway. In general, a pile cannot be produced with unlimited lengths because of the size of the manufacturing machine and transportation to construction site. Therefore, the connection of pile and structural integrity of connection should be considered in the pile design. In this paper, hybrid FRP-concrete composite pile (HCFFT) was investigated by focusing on the connection of HCFFT members. The connection capacity of HCFFT was evaluated by the experiment and the finite element analysis. From the results appropriate connection method of HCFFT is discussed.

Abstract: In this paper we will build some new and original composite sandwich bars reinforced with two and four layers of carbon fiber (in the upper and lower sides), with the core made of polypropylene honeycomb. For these sandwich bars, we will use the next experimental setup: we will clamp them at one end and we will leave the other free. Using an accelerometer, we will record the eigenfrequencies. Bu using the eigenfrequencies values and the Euler-Bernoulli theory, there is established a procedure to determine the bars flexural rigidity and dynamic Young modulus. We will consider the bars as having 320 and 350 mm free lengths. We will highlight how the two extra carbon fiber layers will influence the flexural rigidity values and the dynamic Young modulus.

Abstract: The purpose of the paper is to simulate stress distribution of flexural members which is reinforced with CFRP with secondary load using ANSYS, so the flexural performance the beams containing with same layer of CFRP which is affected by different torque can be studied. As a result, the comparison of the stiffness and deflection of beams influenced by different load history (with initial load or not) and different layers of CFRP in this paper will provide guidance for project.

Abstract: Based on the honeycomb sandwich structure on the supported plates of a satellite antenna, the bending effect of the honeycomb sandwich structure is analyzed with analytical method and finite element method (FEM) to design and verify the models established in the paper. Then, the analytical method without/with considering the flexural rigidity effect of the face sheets is solved. And the equivalent model of the honeycomb sandwich structure is constructed for valuating analysis. Then the three different models are analyzed with finite element method. The results show that, the flexural rigidity of face sheets can affect the bending of the structure when the thickness cant be ignored. Compared to the reality model, the bending results of the equivalent model are more conservative. Its significant in the engineering practice for the honeycomb sandwich structures.

Abstract: Research and practice show that frequency method is still the most practical and accurate method among all kinds of cable force measurements. Based on the classical string vibration theory, the finite element model of stay cable was created, and a method of iteratively computing stay cable balance curve considering with flexural rigidity was proposed. How dose the flexural rigidity affects the balance curve of stay cable was discussed, and the changing curves of the distance-to-sagging ratio following the pull-to-bend ratio were plotted, which indicated the bigger flexural rigidity, the smaller sagging. 25 pairs cable modality of Xichang cable stayed bridge were accurately analyzed, mode crossover was testified by finite element method, changing curves of frequency and mode shape following the cable force were separately plotted, and changing rule was induced, practical cable force computing method was given. Frequency difference is suitable to judge the rank of actual measurement frequency, and the second frequency is recommended to compute cable force. Engineering instance analysis testified, the method of practical cable force measurement could rule out errors by mode crossover, and be applied to cable with any lengths and any force.

Abstract: Due to he complexity of the shipping collision process, the design of the protection device can not be accurately calculated by theoretical formula. Through the establishment of the anti-collision device in simplified model, this paper carries out the simulation analysis of the finite element values, and studies the key parameters that affects the performance of the anti-collision device: the geometric structure of inside and outside of steel, the combination of anti-collision circle (elastic element), the flexural rigidity of peripheral steel. And then we get the design parameters of the equivalent flexural rigidity of peripheral steel which is to ensure the that the peripheral steel won’t be partial collapse when there are some collision between some representative ships and it; and we also find that the appropriate increase in the flexural rigidity of around the vertex of the outer steel will improve the overall anti-collision ability of the anti-collision device.

Abstract: By means of inertia-moment method, formulae are derived for calculating flexural rigidity of RC beams under different loading stage, which can be used for calculating initial rigidity and rigidity in service stage. Involving less parameters, it’s convenient to use the formulae. As for four examples, calculations are carried out by both code method and formulations given in this paper, and satisfied results are shown. Further more, based on finite rib method, nonlinear-all-rang analysis is done for M-B of beam sections.

Abstract: Based on the experiment results of five plain steel plate-light weight concrete hollow deck specimens, the design methods of the composite decks which mainly including the calculation method of the bearing capacity and calculation method of the flexural rigidity were introduced. In the paper, the bearing capacity and flexural rigidity of the composite at two orthogonal directions, which including the direction parallel to the pipes and the direction perpendicular to the pipes, were both introduced. The calculation results of the bearing capacity and middle-span deflection were in good agreement with those of the experimental results, and in the return calculation methods were verified. Therefore, the design methods and calculation methods were useful to the design of this new type composite deck.

Abstract: Considering of the condition that the steel reinforced concrete beam is mainly used to bear the vertical load and preserve the robustness of integrated structure, this paper takes the flexural rigidity of beam subjected to short-term load effect as the damage characterization of SRC beam. According to the related theoretical analysis and experimental research, the damage sensitivity of various design parameters which contain the sectional height, the strength of concrete and steel ratio are analyzed, and the influence laws of main design parameters impacted on damage evolution of SRC beam are revealed. The research shows that sectional height is proved to be the most sensitive factor in the damage of SRC beam and the steel ratio takes the second place, and then the strength of concrete is the most insensitive to the damage of SRC beam. The research achievements will provide theory and date support for establishing the storey damage model of SRC frame structure under seismic excitation.

Abstract: We have already considered the problem of joint work of structure, foundation slab and basis in [1, 2] (two-layer beam or slab on elastic basis). The distinctive paper is devoted to analysis of two-layer beam-strip on elastic basis, which corresponds to the problem of the plane deformed state. Nonlinear dependence of internal forces on structure height is presented.