屈服分析法Yieldanalysis.docx

1、屈服分析法Yieldanalysis屈服分析法（Yield analysis）屈服分析法(Yield analysis) The yield discrimination method and its engineering application for seismic design of buildings Wei Lian Wang Sen Shanghai weilian engineering structure design office (shenzhen department) Yield Prediction Method and Its Application in Sei

2、smic Design of Building Structure abstract In this paper, the yield criterion of seismic design of building structures is to judge the actual structure under earthquake action An effective way to take time. In this paper, the calculation method and the yield discriminant principle are proposed to fi

3、nd the weak part of the structure The measures are taken to ensure that the structure meets the specification of small earthquakes and not bad, and the earthquake can be repaired, thus providing for the earthquake resistance targets of big shock Quantitative calculation method. In this paper, three

4、practical engineering cases of different structural types are analyzed by yield discriminant analysis. The Abstract This paper presents the yield prediction method which can find out the weak member to be concerned, its yield type The yield moment of a building structure under certain intensity of s

5、eismic action Yield prediction principle in this paper provide the quantified method to pick up the weak members of the structure. Take enforcement measures and ensure the structure satisfying the anti-seismic fortify target of no destory under Minor earthquake, repairable under middle earthquake, n

6、o collapse under major eartkquake Stipulated in the China design code. It also presents calculation results of 3 practical tall building structures to show the application Of the method. key words Building structure, earthquake action, yield test, weak spot The Key Words Building structure, Seismic

7、Action, Yield prediction method, Weak member One, the introduction Chinas early building seismic design standard 1, which basically adopted the practice of foreign regulations at that time, was applied to elastic earthquake Structural coefficient After the reduction of C, only the strength checking

8、and construction measures are adopted to meet the structural ductility. In our country 1976 The tangshan earthquake caused the whole city of tangshan to be flattened in an instant, and the casualties were extremely heavy, so it was prepared 1989 construction resistance Earthquake design specificatio

9、n gbj10-89 2, proposed the aseismic fortification goal of small shock not bad, medium shock can be repaired, big shock wont fail, In this paper, the deformation calculation method of building structure is put forward, the design method of anti-torsion structure is designed, and it is required to ado

10、pt different seismic grade The corresponding structural measures have also been proposed for some important buildings. The elastic-plastic deformation is analyzed and checked. It played a major role in preventing structural collapse. The new building in 2002 Structural seismic design specification (

11、gb50010-2002) 3 is still adopted The same aseismic fortification targets are the same, but two are built There are two problems in seismic design calculation of seismic design specification: 1. No special design rules are made for the analysis of weak components in the structure of the earthquake, b

12、ut only for the framework The weak layers of the type shear structure are provided with some rules. This is far from meeting the design practice requirements. Sometimes, let Easy to bring about the confusion of concepts. 2. Under the influence of the earthquake, the specification only provides the c

13、onceptual requirements of mid-earthquake repair, but not There are specific rules for the design of aseismic design, which is beyond the probability An earthquake of 10% is clearly not enough. For the above mentioned above, this paper puts forward the yield discrimination method of building seismic

14、design to determine whether the component has yielded or not Yield and what kind of yield, as the basis for examining and mastering the actual seismic capacity of the designed structure, can be found The position of the weakest member of the structure and its yield property and the size of the earth

15、quake action in the case of yield are presented 1 In order to comply with the design principles of aseismatic design, such as the premature yield of the component, it should be strengthened appropriately and delayed the appearance of yield, which is to prevent The structure of the structure under th

16、e influence of the earthquake is beneficial, while not allowing the brittle failure of the shear yield or the safety of the structural safety The failure of tensile or pressure bending can better guarantee the seismic safety of the structure and meet the aseismatic targets O. In this paper, it is su

17、ggested that the main stress components, such as vertical components, should not be allowed to yield In the case of beam or other secondary components that can be used for energy consumption, a minor yield can be allowed, such a design party The method can better reflect the requirement of medium ea

18、rthquake repair through proper quantitative calculation method, which can be quake-resistant to earthquakes with small earthquakes and rare earthquakes Combining with the design rules, it can better achieve the target of seismic fortification of small shock, medium shock, and shock. The structure of

19、 many components under the action of the earthquake has entered into yield, and its calculation needs to be taken into consideration of the analytical method of structural elastoplastic Law, although from the United States Professor r.c. lough published the first paper on the analysis of elastoplast

20、ic seismic response in the shear structure. Has gone through More than 40 years of research, but the dynamic elastic-plastic analysis method is still not mature enough, even the static elastic-plastic analysis Methods (push-back analysis method) are relatively mature and practical in relative develo

21、pment 4, but the computational workload is still heavy and technical difficult The degree is also larger, so it is still difficult to promote the application in practice. But the yield discriminant rule proposed in this paper is to seek the most The structure of the weak component is still in elasti

22、c state in general, so the calculation of this law under earthquake can be approximated Using the same elastic calculation method as the small shock, this method has provided the convenience for the application of engineering in engineering. Ii. Weak layer and weak member An upper part of Olive Hosp

23、ital was in the San fernado earthquake in 1972 The multi-storey building of the lower frame of the shear wall is caused by the lack of flexural strength of the bottom reinforced concrete column Local collapse. soon The structure of a three-story reinforced concrete frame structure in tianjin is due

24、to a strong aftershock of the 1976 tangshan earthquake The second layer reinforced concrete column is bent in bending yield and the whole structure collapses. The second layer is bent because of plastic deformation S form. These two famous cases, which collapsed in the earthquake, have made structur

25、al engineers aware of the dangers of weak layers in the structure Sex should be taken in the seismic design of structures to prevent. Subsequently, the single - layer structure, multi-layer frame structure and multi-layer shear structure are analyzed and studied Once the weak layer is under the infl

26、uence of the earthquake, it may result in a large plastic deformation concentration in the weak layer, resulting in the junction The structural collapse of 5 6, one of the floors into the yield sign is the earthquake action of the floor shear force has exceeded the floors shear yield Strength. For a

27、 multilayer frame structure, the formula can be expressed as follows Vyi Vei (1) Yji yji Vyi =. j Vyji =. j MTh + iMB (2) In the formula, the Vei is the elastic seismic shear force under the action of the horizontal earthquake; Vyi for floor All the columns of I formed when bending the bend Shear be

28、aring capacity, T, B, respectively I in the first layer J column upper and lower bend yield strength. M yjiM yji The above formula can still be used for multi-layer shear wall structure, but The shear bearing capacity of the I layer wall can be root According to the formula of shear wall shear beari

29、ng capacity of 7 in 7 of high rise building concrete structure (jgj3-2002), the formula of shear wall shear bearing capacity is determined. Thus, it can be seen that the minimum value of the shear ratio is the definition of the weak layer (Vyk/Vek) min 2 Define the weak layer The position of I is ex

30、pressed as follows: Vyi/Vei (Vyk/Vek) k = 1. And I - 1, I + 1,. N of 3 Theoretical studies show that even a shear - type multi-layer frame is not a weak layer under the action of horizontal earthquake The column or vertical component enters into submission at the same instant; Instead, it is a root

31、or some of the weakest pillars that give in to the earthquake and continue to function. The other columns caused the floor to collapse as a result. Further analysis shows that the shear wall is bent The shear wall itself may be affected by the difference of the force and the structure of the reinfor

32、cement Bend yield or shear yield, under the design principle of strong shear weak bend, when a certain shear wall first appears bent yield, then in When the earthquake action continues to increase, other components will gradually yield to each other, and different structures have their own unique yield development and plasticities The law of redistribution of sexual internal force does not necessarily result in th