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1.
Considering the large negative bending moment at the end of frame beam and low tensile strength of concrete,a new composite steel-concrete frame beam(CSCFB),reinforced by a T shape steel beam at the negative bending regions,was brought forward.Through two full-scale of single-layer CSCFB frame models experiment,the load-displacement curves of CSCFB and strain distribution at cross section were obtained.Compared with the ordinary composite beam,the T shape reinforcing section can enhance the beam stiffness effectively,and make it distribute reasonably.The segment flexural rigidity method is presented and validated.  相似文献   

2.
By the way of experiment and analysis of two "one story and one bay" reinforced concrete frames, namely a "beam with weaker column" frame and a "column with equally strong beam" frame, the features of internal force redistribution are investigated and an elementary comparison about bending moment redistribution of three kinds of frames namely the "column with weaker beam", "beam with weaker column" and "column with equally strong beam" is given. Through this comparison, the objective existence of such "three kinds of frame" is proven, the moment redistribution is different for each frame and for the moment modulation, the elastic moment diagram and the difference of the internal force redistribution in different frames should be considered together.  相似文献   

3.
In order to researchmechanical capability of the reinforced concrete beam with bonding steel plate, adopting separatemethod to establish finite element model of the reinforced concrete beam with bonding steel plate, using FEM to study dynamical characteristics of the model, have got good results which can not be easily got using traditional resolution method, which can give referenceto study dynamical characteristics of the reinforced concrete beam with bonding steel plate.  相似文献   

4.
It is analyse and calculation about the dynamic characteristic of motorcycle frame by FEM model,carry on validation through experimental modal method,Get back frame modal parameter and shake type.On the base of analyse,ameliorate the structure of motorcycle frame,and validate the effect of amelioration, elevation the comfortable porperty of riding motorcycle. Therefore, it has important theoretic significance.  相似文献   

5.
In the view of reliability calibration, this paper analyzes the probabilistic sense of the provisions of "Strong Column and Weak Beam' and axial compression ratio in aseismic criteria (GBJ 11 89), which demonstrates that there is much difference between different aseismic ranks of RC frame. The authors suggest that it is possible to make axial compression ratio larger by adjusting the moment capacity ratio between column and beam. Finally, the direction and method of further studies are proposed.  相似文献   

6.
7.
In this paper, ultimate loading capacity of eccentric compressed timber column and elastic-plastic behaviour of the material of the cross section are considered.An approximate theoretic method dealing with the maximum mid-span deflection of the column when breaking is advanced.As a result, a formula calculating failure deflection of the rectangular cross section is derived. The results of theoretic calculation are well coincident with those of tests.  相似文献   

8.
Rotary hinges are temporary joints connecting arch ribs with the abutments of rigid frame arch bridges during the vertically downward rotating construction process.We probed the mechanical properties of a rotary hinge.Its stress distribution was simulated in contact FEM during the vertically downward rotating construction of a rigid frame arch bridge.The results show that nearly the entire structure of the rotary hinge is in a low-stress state with only a minor area in a high-stress state.By strengthening some local structures,rotary hinge construction security could be satisfied by its mechanical properties during vertically downward rotating construction.  相似文献   

9.
A majority of reinforced concrete frame structure failure patterns resulting from the May 12, 2008 earthquake in Wenchuan County, P. R. China were analyzed. It was found that the main failure mode of frame works was “strong beam, weak column”, which conflicts with the design criteria of “strong column, weak beam”. The cause of this failure pattern was analyzed. A new concept is put forward that should be considered in design work. The over strength caused by slabs connected monolithically to the beams is analyzed. The joint types, transverse beam stiffness and lateral drift influence the reinforcing effect of the sla, Moreover, a reinforced concrete frame model was simulated using the program ABAQUS. The slab reinforcement stress distributions at different lateral drifts were analyzed and the effective flange width value proposed.  相似文献   

10.
In order to analyze the influence of holes on castellated beam behavior,one typical castellated beam with hexagon holes are studied through nonlinear finite-element analysis.Stress and plastic distribution,flexural deflection are investigated and compared with those of beam without holes and proposition to design practice are put forward.  相似文献   

11.
12.
By the experimental study on a full-dimensioned prestressed frame of two spans, the relative factors are analyzed such as relative height of equivalent compression zone in critical section, secondary moment, ratio of beam rigidity to column and development of cracks in the top of columns etc., which influence the moment distribution of the post-tensioned prestressed concrete frame from the side of internal force redistribution. It is believed that that the factors of relative height of concrete equivalent compression zone and secondary moment influence the moment modulation in most degree, and ratio of column rigidity to beam also plays a part in the moment modulation to some extent. Second, the plastic joints of frame with excessive spans exit in the span which endure the whole load, at last the whole frame is destroyed because of the destruction of the loading frame, the influence to the non-loading span is little.  相似文献   

13.
Facing the complicacies of motorcycle frame and the fact that the motorcycle frame is subjected to ground dynamic loads,considering the interaction between all parts of the motorcycle,the paper takes all these factors into account and builds a detail transient intensity explicit finite element analysis model,to simulate the motorcycle frame''s dynamic intensity time variation during the motorcycle working.The studies indicate: according to the result of transient analysis,the paper joins the characteristic of the motorcycle frame and stress distribution status,can make the transient intensity analysis more accurate and offer some reliable suggestions for dynamic intensity design of motorcycle frame.  相似文献   

14.
WANG Ziqi 《保鲜与加工》2012,(Z2):161-164
Earthquakes for the loss of life and property to people is immeasurable. Want to reduce such losses, on the one hand we hope that Government departments can forecast and notify you in a timely manner, on the other hand we need to develop anti-seismic structure of the building, reducing losses when the earthquake happened. Interlayer seismic isolation frame structure is the latest development of a seismic isolation structure.It compared with the ordinary seismic structural damping performance is better, had a large advantage.  相似文献   

15.
In this paper, based on the structure characters and load applying means, a method called as curvature force method is put forward and proved in the nonlinear analysis of bonded prestressed concrete frame. Based on the nonlinear program, the simulation calculation was carried out on test results of two prestressed concrete frames by this method. The results from calculation are identical with the experiment ones. So it may be added to the methods for the nonlinear analysis of prestressed concrete frame.  相似文献   

16.
Three different types of connections (dog-bone connection, bolted end-plate connection and T-stub connection) were analyzed using finite element software-ABAQUS. The dynamic behavior of connections following the column damage during progressive collapse were concluded through the analysis of load-rotation relationship when different impact loads were applied. The results showed that the forming of catenry mechanism failed during the process of progressive collapse when sufferring from impact load. And the reduced flange and bolts were the weakest parts of beam-column connections. Meanwhile, ductility method was suggested assessing the behaivor of connections. Defining the rate of ultimate rotaion capacity under impact load (θmax ) and rotation that began to form catenry (θc) as the ductility of connection. When the rate greater than 1.0, it suggested that the connection had the ability to develop catenry and the higher the rate is, the higher the security reserve capacity of the structure. This method could be used to design structures of anti-collapse economiclly and properly.  相似文献   

17.
On the basis of analyzing and summarizing the recent theoretical researches on constitutive models and failure criteria for brick masonry, a combination of a useful constitutive model with a reasonable failure criterion is used for describing the behavior of brick masonry under the loading in plane. A finite element program of nonlinear analysis is compiled. The predicted results are found to be in good agreement with Andreau's results.  相似文献   

18.
The refined plastic-hinge method is one of the simplified advanced analysis methods. The second order effects of the whole structure and its members, geometric imperfections and residual stress as well as the feature of semi-rigid connections can be taken into account in this method. The refined plastic-hinge method can be used in advanced analysis and design of planar steel frames, while its use in the advanced analysis of space frames needs to be developed. The technique associated with the dealing of different inelastic factors in advanced analysis of both the planar and space steel frames with practical refined plastic-hinge method and the available way to extend planar frame analysis to space frame analysis are reviewed in detail. The problems of the refined plastic-hinge method for advanced analysis are discussed in this paper.  相似文献   

19.
20.
A new composite structure which is composed of steel beam and concrete girder is introduced in fuel electric plant construction. With different height of concrete girders with or without anchor bar, two scale models from an actual project were designed and tested. It is shown that the maximum restraining moment of ends of steel beams is approximately 60kN*m; influence of anchor bar is little; the one with 600mm high concrete beam is damaged by shear, and the others steel beam is damaged by bending failure. Finite element models were built for supplementary analysis, and the result indicates that critical value of the height of concrete beam of different failure modes is 700mm; stiffness of shear key and thickness of floor have great influence on the structure; size of anchor bar has little influence; and width of the end of the steel beam has certain influence.  相似文献   

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