Papers by Keyword: Frame Structure

Abstract: This study aims to evaluate the fatigue life of the frame assembly, including the chassis frame and subframe, of a medium dump truck. The combined method of finite element (FE) analysis and multi-body dynamic (MBD) simulation is employed to analyze the structural stress. Road roughness, as the vibration excitation source in the vehicle MBD model, is simulated according to random road profiles of ISO 8608:2016, considering the vehicle speed. The stress-time histories are calculated using quasi-static analysis when the frame structure is subjected to dynamic loads. The fatigue analysis model in the crack initiation period is developed based on the P(%)-S-N curve and linear damage rule. The results indicate that the frame assembly meets the required fatigue strength, achieving an estimated service life greater than 20 years under combined operating mode. These outcomes provide valuable insights for the design and durability assessment of the frame structure when vehicles are utilized under different operating conditions.

Abstract: The paper presents experimental and computer researches of ferroconcrete beams at high-temperature influences. There were conducted the experimental fire tests of ferroconcrete beams. The most promising way of verifying these experimental research data is computer simulation of structures, also during a fire. In order to evaluate the quality of the experiment and the reliability of the received temperature distribution.

Abstract: Precast reinforced concrete demountable column system with elastically mounted diaphragms inserted into frame sections developed within the TACR grant project [1] was verified by a pseudo-dynamic tests in the UTAM AV CR experimental facility. The experimental verification and theoretical analysis was aimed at identifying the stiffness characteristics and dynamic response of the “frame” section, including the evaluation of the effect of demountable joints while mounting the diaphragm on beams using elastic (rubber) bearings. The experimental verification was performed for three different diaphragm to beam connections made by a rigid screw connection and by a connection with elastic bearings with two different stiffness values. During the first phase of the experimental verification the structure was exposed to pseudo-dynamic loading by a hydraulic jack controlled by deformation or by amplitude and corresponding frequency of the jack. The absolute deformations of the structure as well as relative deformations between individual structural elements were monitored by means of linear deformation sensors. The force necessary for reaching these deformations was also monitored. In the second phase of the experimental campaign the natural frequencies and dampening characteristics were identified. Based on the obtained values, the stiffness and dynamic characteristics of the frame structure with three different types of the stiffening diaphragm connections were identified and were compared with numerical model. Theoretical analysis and results of experimental research proved the satisfactory resistance of the proposed multi storey building system.

Abstract: Part of the bottom column in the frame structure is buried in the soil,sometimes it should be considered the affects from the body of the soil when calculating the ground floor of the frame structure. The Winkler assumes is quoted in this article, as considering the coefficient of the Soil-column interaction, the equivalent height calculating formula of the column restrained by the earth is deduced , this can change the frame structure that restrained by the earth into the commonly structure to calculate. It illustrates that the restrained load by the earth in the bottom of the structure has the big affects on the internal force and lateral. It provides a simple calculating method for such structure.

Abstract: Taking a six-story glass bead thermal insulation concrete frame structure building in Kangding, Sichuan as model, to design filler wall composing of fly ash autoclaved aerated concrete block. Utilizing energy dissipation theory analyzes the building energy consumption. Conclusion: The glass bead thermal insulation concrete frame structure of fly ash autoclaved aerated concrete block filler wall meets the requirement of Sichuan residential building energy-saving code.

Abstract: A new inorganic nonmetallic cementing material rather than epoxy resin was adopted in carbon fiber sheet (CFS) strengthened concrete beams and slabs in this paper. Firstly, the types of inorganic adhesive were introduced and double-shear tests and the compressive strength of specimens as a function of temperature were studied to prove the effectiveness of inorganic adhesive in CFS strengthened concrete beams and slabs was studied. The practice shows that MPB has good performance when applying at high temperature. RC beams and slabs strengthened with new inorganic adhesives sticked FRP sheets are feasible. The appearance of MPB renders an extensive prospect for carbon fiber sheet (CFS) application in building structure reinforcement.

Abstract: This paper is a seismic response study on a vertical irregular frame structure which has a cantilevered top floor. Aimed to analyze the features of seismic response for a vertical irregular frame and scaled model, dynamic time history analysis and shaking table test have been carried out by use of the earthquake waves recorded in WENHUAN earthquake. It shows that the results of dynamic time history analysis and shaking table test are in good agreement, and the earthquake influence coefficients obtained by dynamic time history analysis and shaking table test are larger than the value according to Code, which indicates that the results would be not secure if the simplified methods specified in Code only in the sight of the calculation of earthquake loads.

Abstract: The dynamic response process for the reinforced concrete frame under different peak value of explosion load was simulated by the general finite element software SAP2000, followed by the comparative analysis on the displacement of the beams and columns under each condition. The analysis results show that the displacement of the beams and columns suffering the explosion load directly is ten times or even dozens of times more than those far away from the explosion load, which makes it clear that the explosion load influence on frame structure has a certain locality.

Abstract: The finite element model was established in this paper to study the process of dynamic response of RC frame structure under internal explosive loading. The burst point in the model was located in the center of the frame structure .The article analyzed the process of the dynamic response of the frame structure in the explosive environment and the result of the numerical simulation accorded well with the test. The result showed that the finite element model was feasible as well as providesed reference to the design and protection for the building structure.

Abstract: In this paper, some numerical verifications would be presented and discussed, mainly including the following three types: (1) the pure bending beam in which the structural stiffness would maintain the original value and not change along with the load; (2) the clamped arc-beam in which the structural stiffness would decrease gradually with the increment of load and the structure would be buckling at some certain load value; and (3) the cantilever beam in which the structural stiffness would increase significantly with the increment of load. For all of the above examples, the present results are in good agreement with the analytical results and numerical results in other literatures, testifying and illustrating the validity of the large rotation matrix for nonlinear framed structure, which is developed in the part 1 of this paper.