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Assessment and Review of Performance Levels of Concrete Structure Designed in Accordance with ACI 318-99 and UBC 97 Regulations.

Reza mokarram aydenlou PH.D.,P.E., C.Eng., S.E., M.ASCE http://www.sciencedirect.com/science/article/pii/S1877705816301576

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Assessment and Review of Performance Levels of Concrete Structure Designed in Accordance with ACI 318-99 and UBC 97 Regulations. IN the name of GOD

Subject review of the article Why has this research been done? Structural systems "intermediate moment frames" of concrete in the world as one of the most common structural systems indicate questioning . The structures responsible for the what extent of performance level earthquake "seismic regulations such as the UBC 97"?

What was the research process? This research has been done according to the computational model is designed according to the provisions of Section ACI 318-99 has the capacity to force members are 0.9 to 0.95 ratio Finally, check the performance of the samples was determined according to Regulation FEMA356 evaluate the performance publications .

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Assessment and Review of Performance Levels of Concrete Structure Designed in Accordance with ACI 318-99 and UBC 97 Regulations.

Research result

Reviews investigation period structures Experimental and dynamic evaluation and acceptance criteria

Investigate the behavior linear structural analysis and design

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Determine the performance level in design of structures

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Assessment and Review of Performance Levels of Concrete Structure Designed in Accordance with ACI 318-99 and UBC 97 Regulations.

What will be discussed in this presentation? Is supplied by "intermediate moment concrete frame structures" designed according to the “UBC97 and ACI 318-99 ", in "seismically an active medium" generally level of performance based "safety of life in the earthquake danger level One "?

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Assessment and Review of Performance Levels of Concrete Structure Designed in Accordance with ACI 318-99 and UBC 97 Regulations.

Algorithm evaluation style "performance level"

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Assessment and Review of Performance Levels of Concrete Structure Designed in Accordance with ACI 318-99 and UBC 97 Regulations.

level of seismic hazard

level of expected performance

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Assessment and Review of Performance Levels of Concrete Structure Designed in Accordance with ACI 318-99 and UBC 97 Regulations.

Coefficient earthquake (UBC 97 )

name

Frame R type

Number of story

Height

Îą

T etabs

model 1 model 2

Rw = 7 Z = 0.25 , S=1

7 10

22.4 32

0.07 0.07

15

48

0.07

1.42 1.89 2.75

model 3

Te

T

0.90 1.18

0.72 0.94

1.59

1.27

Check correct linear analysis in computer models model 03

model 02

CvI UC : RT 2.5C a I UC : R C v : max(ABT,0.1ART) AB Ca : 2.5 model 01

Mode

Period

UX

UY

Mode

Period

UX

UY

Mode

Period

UX

UY

1

2.76

0.00

74.19

1

1.90

0.00

74.87

1

1.43

0.00

76.53

2

2.38

73.4

0.00

2

1.71

75.84

0.00

2

1.23

77.12

0.00

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Assessment and Review of Performance Levels of Concrete Structure Designed in Accordance with ACI 318-99 and UBC 97 Regulations.

Modeling assumptions Length

Wide

85

85

50

55

80

80

40

45

70

70

40

40

65 60 55 50 45 40

65 60 55 50 45 40

In all models of these beams is used 15 floors

floors 10

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COL

60

BEAM

50

member

Name

MODEL03

member

MODEL02

Wide

MODEL01

Length

7 floors

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Assessment and Review of Performance Levels of Concrete Structure Designed in Accordance with ACI 318-99 and UBC 97 Regulations.

The parameters of nonlinear static analysis "pushover"

Te 2 dt : C0 C1C 3Sa ( 2 )g 4p

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To determine the structural performance target displacement should be determined using the relation FEMA 356.According to the lateral load distribution structure for nonlinear static analysis "pushover" structures should be done. It analyzed the results of the evaluation criteria also displacement analysis target in the middle of concrete moment frames at different altitudes codes according to the diagram for the relationship.

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Assessment and Review of Performance Levels of Concrete Structure Designed in Accordance with ACI 318-99 and UBC 97 Regulations.

LS CP IO ď‚ł ď‚Ł

The introduction of plastic hinge in beams and columns The introduction of plastic hinge in beams and columns according to specifications provided in Table 7 that has been extracted from publication FEMA 356 takes place and is ultimately defined.

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Assessment and Review of Performance Levels of Concrete Structure Designed in Accordance with ACI 318-99 and UBC 97 Regulations.

Analyzing Non-linear modeling to assess the structural performance If you construct computer models assessed in accordance displacement target expected to be capped table . The results of this movement displacement is shown below. MODEL01

y

x B

MODEL02

IO

IO

x LS

LS

MODEL03

y CP

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CP

x C

C

y D

D

E

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Assessment and Review of Performance Levels of Concrete Structure Designed in Accordance with ACI 318-99 and UBC 97 Regulations.

The results of nonlinear structural performance

With height on their side stabilization structures that concrete moment frame average. Nonlinear behavior of these structures are different.

Distributed stiffness floors such algorithm: By increasing the height of the structure to be centered in the middle floors stiffness. in upper floor members plastic hinge is not formed .

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The span also increase due to the stiffness factor is that again as a double impact on the formation of plastic hinges on the upper floors.

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Assessment and Review of Performance Levels of Concrete Structure Designed in Accordance with ACI 318-99 and UBC 97 Regulations.

Analyzing nonlinear structural performance

Lateral displacement Target X

Lateral displacement target X

186635 230779 294398

11770 19002 32883

17.06 24.73 40.2

16.62 24.59 38.2

474845 516295 601370

Shear forces according to the displacement target pushover Y

Seismic whip force

0.0830 0.0697 0.0569

.

Base shear at linear analysis

2247696 3310607 5175196

X

User coefficient

MODEL01 MODEL02 MODEL03

Shear forces according to the displacement target pushover

Name

Weight of structure

Results extractive displacement target computer models

407866 431585 557000

The purpose of the plastic hinge formed by the displacement in the computer model define Name Model 01 Model02 Model03

Push X Y X Y X Y

A

B 301 302 638 644 706 707

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B

IO 97 94 100 124 312 329

IO

LS 50 52 62 32 168 164

LS

CP 0 0 0 0 0 6

CP

C 0 0 0 0 0 0

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Assessment and Review of Performance Levels of Concrete Structure Designed in Accordance with ACI 318-99 and UBC 97 Regulations.

CONCLUSIONS It can be concluded from this study that compared the process to be separated into two parts

It can be said concrete moment frame structures in areas with seismic mean average of the prescription if the seismic code of “UBC97 and ACI 318-99" in the analysis and design criteria are linear and frame components, the tension between 0.9 to 1; performance based upon “FEMA 356" in the evaluation and nonlinear analysis are provided. With a closer look you can see, components and constituent elements of the frames of linear seismic analysis has been done on “UBC 97", largely explain the difficulty in this type of structures is such that at the time of analysis nonlinear and evaluation based on the expected performance of the middle classes, mainly structural elements capacity is expected to be over capacity . This contributed to general non-economic plan and also prevents the formation of plastic hinges on the upper floors of the structure. It looks like the nonlinear analysis in the properties of materials with respect to the gap in order to form a plastic hinge of the site shows the different behavior of each class can be a factor to be considered.

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Assessment and Review of Performance Levels of Concrete Structure Designed in Accordance with ACI 318-99 and UBC 97 Regulations.

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Seismic rehabilitation of building  

Assessment and Review of Performance Levels of Concrete Structure Designed in Accordance with ACI 318-99 and UBC 97 Regulations.

Seismic rehabilitation of building  

Assessment and Review of Performance Levels of Concrete Structure Designed in Accordance with ACI 318-99 and UBC 97 Regulations.

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