Papers by Keyword: Internal Force

Abstract: The paper deals with the designing and analysing of concrete structures. A particular attention is paid to a multi-segment slab made from reinforced concrete. The purpose of the paper is to evaluate, in a non-linear analysis, impacts of input parameters of the concrete on the real load-carrying capacity of the ceiling which has been designed originally in DeMKP. FEM software applications have been used in the analysis. This is an in-house application DeMKP for designing the systems in line with standardised procedures. Another software is ATENA Science which can be used for non-linear analyses.

Abstract: Based on the open excavation area from Yulu Station to Wulidian Station in Chongqing subway circle lines, the finite element software Ansys was used to establish three-dimensioned model to calculate and analyze the mechanical characteristic of the pile-support supporting. By simulating the construction process of subway tunnel, the characteristics of supporting structure were analyzed from the stress and displacement of pile and supporting. It can summarize that the internal force characteristics of pile-support supporting conform to the requirements of the construction safety.

Abstract: For the present open cut method is still the main method of the construction of metro stations. Foundation pit support structure and lining structure are composed of three basic side wall structure systems (single wall, compound wall and composite wall). In the calculation of internal force of structure, complex interactions between foundation pit support structures including bored pile and diaphragm wall, and the side wall of main structures are investigated. One form is that the foundation pit support structure and side wall can only deliver pressure and separate partly; another is that they deform together by construction measures. In this paper, the effects on the internal force of main structure influenced by foundation pit support structure are quantitative studied, and the reference resources for optimization design are provided.

Abstract: While considering various structural and material requirements, 3D models of ship chambers in the ship lock structure using finite element modeling (FEM) software ANSYS. By using FEM software to set up the contacting sections between the base plate, refilled soils and foundation, analyses were done to caluculate the forces exerted on the structure of the ship chamber. After checking the reasonability of the calculated results, discussions were made on the calculation process to allow for future empirical calculations.

Abstract: Finite element procedure was used to build a spatial model of a perforated caisson, the result was compared with the one that was calculated according to the current standard. It is pointed out that simplifying assumption of the standard is different from the actual structure, the side walls can’t act as fixed constraints for the front wall. The calculated mid-span moment in the middle span is close to the ANSYS result, while that in the side span is much smaller than the ANSYS result. It is recommended that the result is multiplied by a expansion coefficient.

Abstract: In order to study the mechanical characteristics of continuous rigid bridge with corrugated steel webs, a bridge of this type with a main span of 100 m is analyzed in this paper. Three models of the whole bridge are established by MIDAS/Civil software, the internal force and deformation of the bridge under the action of dead load, live load and prestressing force were analyzed; results of different modeling methods were compared and the structural checking computation was also finished. With the help of calculation results, the design rationality of the continuous rigid bridge with corrugated steel webs was analyzed finally.

Abstract: In the design and construction code for gravity quay, the inner floor of multi-ribbed buttressed quays generally is divided into two parts to calculate. The part within 1.5 times the rib spacing is as a three fixed edges and one simply-supported slab. The restriction effect of the three fixed edges is the same. However, because of the difference in thickness between vertical plate and rib with the change in the vertical direction of the flow, the effect of them is not the same. It will lead to the result deviating. Sometimes, there will be a phenomenon that the maximum bending moment of inner floor is smaller than the mid-span moment. Finite element software ANSYS was used to make a 3D numerical simulation on a buttressed quay in this paper. Shortcomings in the current code are addressed by comparing the calculation results. This can provide references for engineering design.

Abstract: The purpose of this paper is to compare calculation of internal forces and deformations of slabs for two calculation methods: the finite element method and the finite difference method. Two concrete slabs have been analysed. In the case of the finite element method, different element mesh are used, providing, thus, solutions in different variants. The calculation and algorithms is based on a thin slab theory. Variants calculate in program Scia Engineer effects of shearing forces by means of the Midlins theory or thin slab theory. Algorithms for the calculation were developed in Matlab.

Abstract: A proposed residential district intend to be built in some coal mine subsidence area . Surface deformation influence main components forces of the building is a complex change process. Using the finite element software ANSYS to analyse the main components of the proposed buildings. Analysing main components' internal force relatively change of the first floor under the surface deformation than without surfaced formation. The result reveal that under large surface deformation, the internal force of beam and column changed largely .Beam force increase significantly in excess of 100%, column force increased significantly in excess of 500%. Then analyse-1-3 layer component force changes largely. Residual deformation greatest impact is the underground floor and 1st floor, and then is 2 and 3layer. This study could provide certain design reference for using the subsidence area of Shanxi.

Abstract: 3D finite element analysis is utilized to calculate stress and internal forces in three different lengths of reinforced concrete segment for oil and gas shield tunnel subject to water and earth pressure by means of load-structure model. The rational length of concrete segment is determined to be 1.2m long after comparing the calculated stress and internal force in concrete segment with length of 1.0m, 1.2m and 1.5m respectively. Meanwhile, the safety factor is also compared in order to determine the rational length of concrete segment. The analysis shows that segment length for oil and gas shield tunnel with small cross-section should be less than 1.2m so as to facilitate its transportation and erection on construction site.