CN103838918B - Value obtaining method-comprehensive method of additional effective damping ratios of energy dissipaters with energy dissipation and shock absorption structures - Google Patents
Value obtaining method-comprehensive method of additional effective damping ratios of energy dissipaters with energy dissipation and shock absorption structures Download PDFInfo
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Abstract
The invention discloses a value obtaining method-comprehensive method of the additional effective damping ratios of energy dissipaters with energy dissipation and shock absorption structures. The method comprises the steps of extracting inter-floor shear force values Fit and inter-floor displacement values uit corresponding to seismic wave moment points after the energy dissipation and shock absorption structures are subjected to finite element elastic-plastic time-history analysis; obtaining total strain energy Wst of the energy dissipation and shock absorption structures at the seismic wave moment points and getting a maximum value max[Wst] of the total strain energy Wst; obtaining the sum Sigma Wcj of dissipative energy of all of energy dissipaters; performing calculation to obtain the additional effective damping ratios 8 a of the energy dissipaters with the energy dissipation and shock absorption structures; assessing whether the additional effective damping ratios 8 a of the energy dissipaters are larger than or equal to additional effective damping ratios set for performance objectives of the energy dissipation and shock absorption structures. In the method, the number and the positions of the energy dissipaters are constantly optimized in the accurate computation result obtaining process, the energy dissipaters are appropriate in selection and arrangement, the economic purpose is achieved while the requirement for dissipating seismic energy to the most extent is met, and the construction cost is reduced.
Description
Technical field
The present invention relates to the structure with energy dissipation devices in building structure technology field and analytical technology, particularly relate to obtaining value method-overall approach that a kind of seismic energy dissipation structure sinker adds effective damping ratio.
Background technology
Mainly through structure and component, the antidetonation of conventional building construction occurs that in earthquake damage carrys out earthquake energy, and structure and component badly damaged is exactly conversion or the consumption process of seismic energy.In recent years, along with China's earthquake takes place frequently, cause building structure subject to severe risks of damage, endanger people's life and property safety.Owing to being difficult to arrive effective control overflow to the mechanism of structure " firmly anti-" earthquake at present, therefore mode-energy-dissipating and shock-absorbing technology widespread use gradually in building structure of " soft anti-" earthquake, it has great significance to the building structure of complexity and lifeline engineering.
Energy-dissipating and shock-absorbing technology is that a kind of sinker that arranges in building structure is to the Passive Control technology of the seismic energy that dissipates.Seismic energy dissipation structure comprises agent structure and energy dissipation component, and energy dissipation component to be connected sinker by sinker component with for agent structure forms.Sinker by internal material or and component between friction, utilize elastoplasticity hysteresis to be out of shape or the distortion of glutinous (bullet) property hysteresis dissipates or absorbs seismic energy.In brief, energy-dissipating and shock-absorbing technology is exactly arrange sinker by some position in building structure, is dissipated or absorb the energy of Seismic input structure by its distortion, to reduce the impact on agent structure, thus protection agent structure.Conventional sinker has displacement relationship type sinker, velocity correlation type sinker and compound sinker etc.
In structure with energy dissipation devices, key is the energy dissipation behavior that will give full play to sinker, and this just requires reasonable selection and arranges sinker, and the technical indicator weighing sinker energy dissipation capacity is exactly the additional effective damping ratio of sinker.China's " seismic design provision in building code " (hereinafter referred to as " anti-rule ") gives the determination principle and principle that sinker adds effective damping ratio, it is from energy point of view, additional effective damping ratio adopt sinker to produce under geological process energy that deformation absorbs with sinker is set after the total seismic deformation of building structure can ratio characterize, its estimation equation is:
ξ
a=Σ W
cj/ (4 π W
s) (formula 1)
In formula: ξ
afor the additional effective damping ratio of sinker; W
cjfor a jth sinker is at structure expection relative storey displacement Δ u
jthe energy that lower reciprocation cycle consumes for one week; W
sfor arranging the total strain energy of structure under expection displacement of sinker.
When disregarding torsion effect, the total strain energy W of seismic energy dissipation structure under horizontal earthquake action
s, can estimate by following formula: W
s=(1/2) Σ F
iu
i(formula 2)
In formula: F
ifor the horizontal earthquake action standard value of particle i, u
ifor the displacement of the corresponding horizontal earthquake action standard value of particle i.
Displacement relationship type and speed nonlinear correlation type sinker reciprocal energy consumed for a week under horizontal earthquake action, can estimate by following formula:
W
cj=A
j(formula 3)
In formula: A
jfor the restoring force hysteretic loop of a jth sinker is at relative horizontal displacement Δ u
jtime area.
Visible, the additional effective damping ratio of the rationally sinker of exploitation method calculating is reliably adopted to be weigh sinker in seismic energy dissipation structure select and arrange proper foundation, but, do not provide the concrete exploitation method of additional effective damping ratio in " anti-rule ", especially how seismic energy dissipation structure selects appropriate part also not provide relevant teachings after elasto-plastic time history analysis from numerous and complicated data.And the exploitation method that in " building energy-dissipating and shock-absorbing technical regulation " JGJ297-2013, sinker adds effective damping ratio also have referred only the computing method-envelope method of envelope:
(1) in the elasto-plastic time history analysis of seismic energy dissipation structure, calculate the total strain energy of seismic energy dissipation structure under expection displacement, namely be each floor of agent structure when being assumed to rigidity floor, from finite element software, extract each floor interlaminar shear maximal value as its F
ivalue, each floor emergent interlayer displacement maximum values is as u
i, calculate Ws value according to formula 2;
(2) the restoring force hysteretic loop of a jth sinker is at relative horizontal displacement Δ u
jtime area be A
j, extract hysteresis loop FEM data, and calculate its maximum hysteresis circle area and be A
j, obtain Σ W by summation
cj;
(3) by Ws and the Σ W drawn above
cj, the additional effective damping ratio of sinker is calculated according to formula 1.
But, mutative damp when the additional effective damping of sinker is in seismic energy dissipation structure, the additional damping of each seismic energy dissipation structure is a time-varying parameter, and seismic energy dissipation structure its response when elasto-plastic time history analysis changes along with the change of seismic event acceleration, this has time variation with regard to making the power consumption of sinker.And when adopting envelope method computation structure strain energy, the maximal value of earthquake response is all got in story shearing force and floor displacement, so it is envelope value that strain energy calculates gained, sinker power consumption gets hysteresis loop outermost one to enclose area value, the value got is that sinker consumes energy actual envelope value, therefore, although the computation process of envelope method is simple and convenient, but comparison of computational results is guarded, and accuracy is poor.
How after the elasto-plastic time history analysis of seismic energy dissipation structure finite element, effective damping ratio to be added to sinker and adopt rational exploitation method, to obtain adding effective damping ratio comparatively accurately, thus optimize further layout and the quantity of sinker, be current structure with energy dissipation devices and analysis field technical barrier urgently to be resolved hurrily.
Summary of the invention
The object of the present invention is to provide a kind ofly can improve result of calculation accuracy, obtaining value method-overall approach that the seismic energy dissipation structure sinker that is optimized to reduce cost to the position of sinker and quantity adds effective damping ratio.
Object of the present invention realizes by the following technical solutions: a kind of seismic energy dissipation structure sinker adds the obtaining value method-overall approach of effective damping ratio, specifically comprises the following steps:
(1) finite element elasto-plastic time history analysis is carried out to seismic energy dissipation structure, on finite element simulation calculation platform, namely first set up the finite element model of agent structure, the finite element model of agent structure applies gravity laod, reloads seismic event;
(2) according to relative storey displacement and the storey stiffness of each floor of agent structure, tentatively determine quantity and the position of sinker, sinker is arranged in the finite element model of agent structure, form the finite element model of seismic energy dissipation structure;
(3) on the finite element model of seismic energy dissipation structure, apply gravity laod, reload seismic event;
(4) calculate the total strain energy of seismic energy dissipation structure under expection displacement, namely suppose that each floor of agent structure is rigidity floor, extract the floor interlaminar shear value F corresponding to each moment point of seismic event
itwith floor relative storey displacement value u
it;
(5) by each floor interlaminar shear value F by the step (4) synchronization point of gained
itwith each floor relative storey displacement value u
itbe multiplied, after the summation of the product value of all moment point of gained, get its 1/2, obtain the total strain energy Wst of seismic energy dissipation structure in each moment point of seismic event, and get the maximal value max [Wst] of total strain energy Wst;
(6) analyze and obtain the hysteresis loop that each sinker enters the surrender power consumption stage, calculate each hysteresis loop maximum hysteresis circle area A
j, namely as the dissipation energy of each sinker, then the dissipation energy of each sinker is sued for peace, obtains the summation Σ W of the dissipation energy of whole sinker
cj;
(7) according to following formula:
ξ
a＝ΣW
cj/(4π·max[W
st])
Calculate the additional effective damping ratio § of seismic energy dissipation structure sinker
a;
(8) evaluate the additional effective damping ratio § of the sinker (7) obtained by step
awhether be more than or equal to the additional effective damping ratio of seismic energy dissipation structure performance objective setting;
A) in this way, the additional effective damping ratio § of the sinker obtained
anamely as the additional effective damping ratio of the sinker determined;
B) if not, then step is entered (9);
(9) adjust quantity and the position of sinker, then repeat step (4) ~ (8), until make the additional effective damping ratio § of sinker
atill being more than or equal to the additional effective damping ratio of seismic energy dissipation structure performance objective setting, finally determine the additional effective damping ratio of sinker.
The additional effective damping ratio of the seismic energy dissipation structure performance objective setting that step of the present invention is (8) described be that the sinker target determined in anti-seismic performanceization design adds effective damping ratio, it derives from the design document of Performance Design target; Seismic event is provided by An Ping unit, and it is documented in peace Commentary Report announcement, and each moment point, peak value, spectral characteristic, Ground motion duration etc. of seismic event are all on the books; Gravity laod generally comprises dead load, mobile load and prestress, can load as the case may be.
The present invention is after seismic energy dissipation structure carries out finite element elasto-plastic time history analysis, the summation Σ W of the dissipation energy of whole sinker
cjemploying envelope method calculates, Ws is then by first calculating the total strain energy Wst of seismic energy dissipation structure in each moment point of seismic event, and the maximal value of getting Wst obtains, thus obtain the additional effective damping ratio of seismic energy dissipation structure sinker, and by repeatedly adjusting quantity and the position of sinker, obtain than existing envelope method result of calculation comparatively accurately, the present invention can constantly be optimized the quantity of sinker and position in the process obtaining result of calculation accurately, sinker is selected and arranges proper, the object of economy is realized while the requirement meeting the seismic energy that dissipates more, reduce construction costs cost.With envelope principle of design and counting yield, the present invention can be suitably adopted to calculate additional effective damping ratio.
As one embodiment of the present invention, step (6) in, the dissipation energy of each sinker is obtained by the hysteretic behavior analysis of each sinker set up on finite element simulation calculation platform.
The present invention step (7) in, if the additional effective damping ratio § of sinker
amore than 25%, with 25% value.According to " anti-rule ", when the additional effective damping ratio of sinker is more than 25%, should by 25% value.
As a kind of preferred implementation of the present invention, described seismic event is at least three, and described seismic event is natural ripple or artificial ripple, and the quantity of described natural ripple takes up an area 2/3 of seismic wave sum, and the quantity of described artificial ripple takes up an area 1/3 of seismic wave sum.
The present invention can have following embodiment, and when loading seismic event, the amplitude of seismic event principal direction, secondary direction and Z-direction loads according to 1:0.85:0.65 three-dimensional." building energy-dissipating and shock-absorbing technical regulation " specifies the concrete load mode of seismic event.
Compared with prior art, the present invention has following significant effect:
(1) the present invention is after seismic energy dissipation structure carries out finite element elasto-plastic time history analysis, the summation Σ W of the dissipation energy of whole sinker
cjemploying envelope method calculates, Ws is then by first calculating the total strain energy Wst of seismic energy dissipation structure in each moment point of seismic event, and the maximal value of getting Wst obtains, thus obtain the additional effective damping ratio of seismic energy dissipation structure sinker, and by repeatedly adjusting quantity and the position of sinker, obtain the additional effective damping ratio than existing envelope method sinker comparatively accurately, it belongs to the additional effective damping ratio of one direction (principal direction of seismic event).
(2) result of calculation obtains according to table 2 in Examples below ~ 4 three kind of Simulating Seismic Wave, calculate income value closer to actual value, comparatively accurate, the present invention is under the prerequisite meeting safety requirements, compared to being calculated the quantity determining sinker by envelope method, can save the sinker of about 30%, the cost of sinker also can reduce about 30%.Therefore, good economy performance, significantly can reduce the use cost of sinker.
(3) the present invention can be optimized the quantity of sinker and position according to result of calculation accurately, sinker is selected and arranges proper, realizes the object of economy while the requirement meeting the seismic energy that dissipates more.
(4), with envelope principle of design and counting yield, all can suitably adopt the present invention to calculate additional effective damping ratio in the structure item operation phase.
Accompanying drawing explanation
Below in conjunction with the drawings and specific embodiments, the present invention is described in further detail.
Fig. 1 is sinker plane of arrangement figure of the present invention;
Fig. 2 is that elevation drawing arranged by sinker of the present invention;
Fig. 3 is sinker arrangement figure of the present invention;
The acceleration-time curve figure of Fig. 4 to be seismic event be natural ripple one;
The acceleration-time curve figure of Fig. 5 to be seismic event be natural ripple two;
The acceleration-time curve figure of Fig. 6 to be seismic event be artificial ripple;
Fig. 6 a is the hysteresis loop figure of natural ripple once sinker;
Fig. 7 is that once structural strain can with time-histories change curve for natural ripple;
Fig. 8 is natural ripple two times 0 ~ 6.6s structural strain energy change curves;
Fig. 9 is that natural ripple two times structural strains can with time-histories change curve;
Figure 10 is 0 ~ 2.6s structural strain energy change curve under artificial ripple;
Figure 11 is that under artificial ripple, structural strain can with time-histories change curve;
Figure 12 is natural ripple BRB structure, respectively employing envelope method and floor interlaminar shear change curve of the present invention once;
Figure 13 is natural ripple BRB structure, respectively employing envelope method and floor story drift change curve of the present invention once;
Figure 14 is natural ripple two times BRB structures, adopts envelope method and floor interlaminar shear change curve of the present invention respectively;
Figure 15 is natural ripple two times BRB structures, adopts envelope method and floor story drift change curve of the present invention respectively;
Figure 16 is BRB structure under artificial ripple, adopts envelope method and floor interlaminar shear change curve of the present invention respectively;
Figure 17 is BRB structure under artificial ripple, adopts envelope method and floor story drift change curve of the present invention respectively.
Embodiment
As shown in Figures 1 to 3, in the present embodiment, structural steelwork is band huge transfer truss-Steel frame-brace barrel structure, building height is about 100m, plane is three-back-shaped, is of a size of 100m × 100m, and structure depth-width ratio is 100/69.6=1.44, main building adopts 4 horizontal sections to be that the support tube 1 of L-type forms vertical supporting system, and support tube 1 is near architectural plane corner arrangement.L-type support tube 1 is of a size of 18m × 18m, structural span 33.6m between support tube 1, arrange that corresponding BRB(is the one of displacement relationship type sinker outside this structure L-type support tube 1) form BRB seismic energy dissipation structure, specifically BRB is arranged between the cylinder 11 of L-type support tube and beam 12.Earthquake resistant engineering fortification intensity is 7 degree, III class place, and classification of design earthquake is the 1st group, and basic seismic design accekeration is 0.1g, eigenperiod 0.45s, peace is commented and is provided be 0.48s eigenperiod, and the standard that is categorized as of providing fortification against earthquakes is set up defences class.
BRB all can reach surrender and not flexing when tension and pressurized, can have high rigidity and good hysteretic energy ability, and have concentric diagonal brace and hysteretic energy element feature through appropriate design.The general layout principle of the present embodiment BRB and the arrangement principle of common support similar: as shown in Figure 1, in floor plan, the layout of BRB makes structure close in the kinematic behavior of two major axes orientations, makes the mass centre of structure overlap with center of rigidity as far as possible, reduces to reverse earthquake sheet; As shown in Figure 2, be set up at facade cloth, avoid the rigidity because of local to weaken or sudden change formation weak part, cause excessive stress to concentrate or concentration of plastic deformation.The present embodiment selects two profiles BRB, and select yield strength to be the buckling-restrained energy-dissipation of 235Mpa, yield tensile ratio is 0.8, and design parameter is as shown in table 1:
(table 1)
Two profiles BRB is arranged in outside the L-type support tube of one deck, two layers and girders layer and above 7 layers, adopts inverted v-shaped to arrange.
A kind of seismic energy dissipation structure sinker of the present invention adds the obtaining value method-overall approach of effective damping ratio, specifically comprises the following steps:
(1) finite element elasto-plastic time history analysis is carried out to seismic energy dissipation structure, on finite element simulation calculation platform, namely first set up the finite element model of agent structure, the finite element model of agent structure applies gravity laod, reloads seismic event;
(2) according to relative storey displacement and the storey stiffness of each floor of agent structure, tentatively determine quantity and the position of sinker, sinker is arranged in the finite element model of agent structure, form the finite element model of seismic energy dissipation structure;
(3) on the finite element model of seismic energy dissipation structure, apply gravity laod, reload seismic event;
(4) calculate the total strain energy of seismic energy dissipation structure under expection displacement, namely suppose that each floor of agent structure is rigidity floor, extract the floor interlaminar shear value F corresponding to each moment point of seismic event
itwith floor relative storey displacement value u
it;
Finite element elasto-plastic time history analysis on finite element simulation calculation platform, sets up finite element model carry out analytical calculation.General finite meta software Midas/gen is specifically adopted to carry out dynamic elastic-plastic time-history analysis under rarely occurred earthquake.The Plastic Damage of structural elements adopts plastic hinge to simulate, and structure upper agent structure is steel construction, adopts concentrate hinge model to components such as beam column diagonal braces.During rarely occurred earthquake, the damping ratio of this agent structure gets 0.05.
Natural ripple one (ChiCHi), natural ripple two (Landers) and artificial ripple (acce2) that time-history analysis under the effect of the present embodiment rarely occurred earthquake adopts An Ping unit to provide carry out dynamic elastic-plastic time-history analysis, consider calculated amount and model computing time of elasto-plastic time history analysis, each seismic event all intercepts the moment point between the front 15s of its seismic acceleration peak point to rear 5s, amount to 20s, only structure X to applying geological process.In analysis, the applying of gravity laod and the input of seismic event are carried out in two steps: the first step, apply gravity laod (1.0 dead load+0.5 mobile load+1.0 prestress); Second step, apply X to geological process, principal direction (X to) acceleration amplitude is 220gal, and the acceleration-time curve of natural ripple one is see Fig. 4, and the acceleration-time curve of natural ripple two is see Fig. 5, and the acceleration-time curve of artificial ripple is see Fig. 6.
Seismic event is different, and it is also not identical that BRB enters power consumption state, and under the effect of ChiChi ripple, to enter power consumption state minimum for BRB, and during artificial ripple effect, to enter power consumption state maximum for BRB.
(5) by each floor interlaminar shear value F by the step (4) synchronization point of gained
itwith each floor relative storey displacement value u
itbe multiplied, after the summation of the product value of all moment point of gained, get its 1/2, obtain the total strain energy Wst of seismic energy dissipation structure in each moment point of seismic event, and get the maximal value max [Wst] of Wst;
(6) the restoring force hysteretic behavior of BRB generally gets the linear hysteretic behavior of symmetric double of tension and compression equal stiffness, its W
cja can be taken as by " anti-rule "
j, for the restoring force hysteretic loop of a jth sinker is at relative horizontal displacement Δ u
jtime area, analyze and obtain the BRB hysteresis loop that each sinker enters the surrender power consumption stage, as shown in Figure 6 a, next root of ChiChi ripple effect BRB hysteresis loop, in this structure known, BRB enters power consumption states with time-delay to return curve comparatively symmetrical full; Calculate each BRB hysteresis loop maximum hysteresis circle area A respectively
j, namely as the dissipation energy of each sinker, then the dissipation energy of each sinker is sued for peace, obtains the summation Σ W of the dissipation energy of whole sinker
cj;
(7) according to following formula:
ξ
a＝ΣW
cj/(4π·max[W
st])
Calculate the additional effective damping ratio § of seismic energy dissipation structure sinker
a.
(8) evaluate the additional effective damping ratio § of the sinker (7) obtained by step
awhether be more than or equal to the additional effective damping ratio of seismic energy dissipation structure performance objective setting;
B) in this way, the additional effective damping ratio § of the sinker obtained
anamely as the additional effective damping ratio of the sinker determined;
B) if not, then step is entered;
(9) adjust quantity and the position of sinker, then repeat step (4) ~ (8), until make the additional effective damping ratio § of sinker
atill being more than or equal to the additional effective damping ratio of seismic energy dissipation structure performance objective setting, finally determine the additional effective damping ratio of sinker.
As shown in Figure 7, seismic event is natural ripple one: structural strain energy maximal value is 1.7150E+07kNmm, occur in the 8.84s of ChiChi ripple, BRB power consumption maximal value is 1.4187E+07kNmm, occur in the 8.92s of ChiChi ripple, known at this moment between segment structure reaction the most violent, maximum interlaminar shear is 15948.7kN, and maximum relative storey displacement is 329.67mm; BRB is in elastic stage in 0 ~ 2.5s stage; Additional effective damping ratio is 124.76% with changing course calculated maximum, occurs in 15.64s, but is greater than the equal value 25% of 25% according to specification, and to try to achieve each moment point average of additional effective damping ratio be 3.3202%.
As shown in Figure 8,9, seismic event is natural ripple two: structural strain energy maximal value is 1.9461E+07kNmm, occur in the 10.92s of ChiChi ripple, BRB power consumption maximal value is 1.3261E+07, occur in the 11s of Landers ripple, known at this moment between segment structure reaction the most violent, maximum interlaminar shear is 127357kN, and maximum relative storey displacement is 396.44mm; BRB is in elastic stage in 0 ~ 8s stage; Additional effective damping ratio is 4798.56% with changing course calculated maximum, and occur in 11.92s, but be greater than 25% equal value 25% according to specification, trying to achieve its average is 4.3127%.
As shown in Figure 10,11, seismic event is artificial ripple: structural strain energy maximal value is 1.7090E+07kNmm, occur in the 8.32s of artificial ripple, BRB power consumption maximal value is 2.4552E+07, also the 8.32s of artificial ripple is occurred in, known at this moment between segment structure reaction the most violent, maximum interlaminar shear is 173989kN, and maximum relative storey displacement is 353.98mm; BRB is in elastic stage substantially in 0 ~ 6s stage; Additional effective damping ratio is 448.10% with changing course calculated maximum, and occur in 19.24s, but be greater than 25% equal value 25% according to specification, trying to achieve its average is 4.8909%.
Envelope value is adopted to calculate additional effective damping ratio as shown in table 2:
(table 2)
The additional effective damping ratio of BRB structure under each ground seismic wave function is obtained by computing method of the present invention and existing envelope method, respectively gained is added effective damping ratio superposition and return agent structure, and former seismic energy dissipation structure BRB plasticity hinge arranged cancellation, only allow it provide additional equivalent stiffness, after the additional effective damping ratio of superposition, structural damping ratio is in table 3:
(table 3)
Results of structural analysis relative BRB results of structural analysis deviation average after each superposition damping ratio, see table 4:
(table 4)
Figure 12 ~ 17 are the elasto-plastic time history analysis contrast of structure rarely occurred earthquake under each seismic event, analyze known by above structural response figure and structural deviation mean value compare, compared to envelope method, the present invention calculate gained add effective damping ratio superposition to structure post analysis result and BRB results of structural analysis comparatively identical, and relative deviation average is less.With envelope principle of design and counting yield, Yan Junke suitably adopts the method to calculate the additional effective damping ratio of BRB in BRB seismic energy dissipation structure.Computing method of the present invention except BRB seismic energy dissipation structure can be applied to, the reference that also can require as other displacements of employing and velocity profile energy dissipation component seismic energy dissipation structure in conjunction with reality and " anti-rule ".
Embodiments of the present invention are not limited thereto; according to foregoing of the present invention; according to ordinary technical knowledge and the customary means of this area; do not departing under the present invention's above-mentioned basic fundamental thought prerequisite; the present invention can also make the amendment of other various ways, replacement or change, all drops within rights protection scope of the present invention.
Claims (5)
1. seismic energy dissipation structure sinker adds obtaining value method-overall approach of effective damping ratio, specifically comprises the following steps:
(1) finite element elasto-plastic time history analysis is carried out to seismic energy dissipation structure, on finite element simulation calculation platform, namely first set up the finite element model of agent structure, the finite element model of agent structure applies gravity laod, reloads seismic event;
(2) according to relative storey displacement and the storey stiffness of each floor of agent structure, tentatively determine quantity and the position of sinker, sinker is arranged in the finite element model of agent structure, form the finite element model of seismic energy dissipation structure;
(3) on the finite element model of seismic energy dissipation structure, apply gravity laod, reload seismic event;
(4) calculate the total strain energy of seismic energy dissipation structure under expection displacement, namely suppose that each floor of agent structure is rigidity floor, extract the floor interlaminar shear value F corresponding to each moment point of seismic event
itwith floor relative storey displacement value u
it;
(5) will by each floor interlaminar shear value F of the synchronization point of step (4) gained
itwith each floor relative storey displacement value u
itbe multiplied, after the summation of the product value of all moment point of gained, get its 1/2, obtain the total strain energy Wst of seismic energy dissipation structure in each moment point of seismic event, and get the maximal value max [Wst] of total strain energy Wst;
(6) analysis obtains the hysteresis loop that each sinker enters the surrender power consumption stage, calculates each hysteresis loop maximum hysteresis circle area A
j, for the restoring force hysteretic loop of a jth sinker is at relative horizontal displacement Δ u
jtime area, namely as the dissipation energy of each sinker, then the dissipation energy of each sinker is sued for peace, obtains the summation Σ W of the dissipation energy of whole sinker
cj;
(7) according to following formula:
ξ
a＝ΣW
cj/(4π·max[W
st])
Calculate the additional effective damping ratio § of seismic energy dissipation structure sinker
a;
(8) the additional effective damping ratio § of the sinker obtained by step (7) is evaluated
awhether be more than or equal to the additional effective damping ratio of seismic energy dissipation structure performance objective setting;
A) in this way, the additional effective damping ratio § of the sinker obtained
anamely as the additional effective damping ratio of the sinker determined;
B) if not, then step (9) is entered;
(9) adjust quantity and the position of sinker, then repeat step (4) ~ (8), until make the additional effective damping ratio § of sinker
atill being more than or equal to the additional effective damping ratio of seismic energy dissipation structure performance objective setting, finally determine the additional effective damping ratio of sinker.
2. seismic energy dissipation structure sinker according to claim 1 adds the obtaining value method-overall approach of effective damping ratio, it is characterized in that: in step (6), the dissipation energy of each sinker is obtained by the hysteretic behavior analysis of each sinker set up on finite element simulation calculation platform.
3. seismic energy dissipation structure sinker according to claim 2 adds the obtaining value method-overall approach of effective damping ratio, it is characterized in that: in step (7), if the additional effective damping ratio § of sinker
amore than 25%, with 25% value.
4. seismic energy dissipation structure sinker according to claim 3 adds the obtaining value method-overall approach of effective damping ratio, it is characterized in that: described seismic event is at least three, described seismic event is natural ripple or artificial ripple, the quantity of described natural ripple takes up an area 2/3 of seismic wave sum, and the quantity of described artificial ripple takes up an area 1/3 of seismic wave sum.
5. the seismic energy dissipation structure sinker according to any one of Claims 1 to 4 adds the obtaining value method-overall approach of effective damping ratio, it is characterized in that: when loading seismic event, the amplitude of seismic event principal direction, secondary direction and Z-direction loads according to 1:0.85:0.65 three-dimensional.
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| CN104405054B (en) * | 2014-10-09 | 2016-08-24 | 甘肃省建筑设计研究院 | A kind of construction design method that viscous damper is set |
| CN105696717B (en) * | 2016-01-18 | 2018-08-24 | 广东省建筑设计研究院 | The seismic energy dissipation structure sinker comprehensive optimization method of effective damping ratio is added based on target |
| CN105604204B (en) * | 2016-01-18 | 2018-08-24 | 广东省建筑设计研究院 | The seismic energy dissipation structure sinker envelop optimization method of effective damping ratio is added based on target |
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| CN108897966B (en) * | 2018-07-11 | 2022-03-11 | 中国民航大学 | Equivalent elasticity analysis method of buckling restrained brace structure based on elastic-plastic correction |
| CN113010947B (en) * | 2021-03-02 | 2022-10-14 | 大连理工大学 | Multi-disaster-resistant vibration reduction design method suitable for antenna structure of super high-rise building |
| CN115718967B (en) * | 2022-12-23 | 2023-09-29 | 甘肃省建筑设计研究院有限公司 | Design method for energy dissipation and shock absorption structure of continuous beam damper arranged in high seismic intensity area residence |
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| US20110239551A1 (en) * | 2010-03-31 | 2011-10-06 | National University Corporation Nagoya Institute Of Technology | Self-centering compact damper unit applicable to structures for seismic energy dissipation |
| CN103161347B (en) * | 2011-12-15 | 2015-07-15 | 青岛理工大学 | Performance-based aseismic design method under multi-level design intensity of seismic energy dissipation structure |
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