CTBUH Gold Member

Aedas

About

Member Since: 2006

Member Offices: Hong Kong

Website: http://www.aedas.com/

Aedas is one of the world's leading global architecture and design practices. The company is built on the belief that great design can only be delivered by people with a deep social and cultural understanding of the communities they are designing for.

Aedas’ global platform for creative excellence in design enables some of the world's most talented designers to plug into the latest information and delivery systems they need to produce truly world-class design solutions.

The practice's unique structure, global presence, and commitment to cutting-edge research and development are testament to their desire to deliver design excellence to clients wherever they are in the world.

Fields of Expertise

Architecture; Interior Design; Landscape Architecture; Urban Design

Membership details

Membership Level

Gold

Member Since

2006

Member Offices

  • Hong Kong

Buildings

Rank
Name
Status

Completed

Architecturally Topped Out

Structurally Topped Out

Under Construction

On Hold

Proposed

Vision

Never Completed

Demolished

Competition Entry

Canceled

Proposed Renovation

Under Renovation

Renovated

Under Demolition

Height

1

Tianshan Gate of the World Plots 27 and 28

450 m / 1,476 ft

2

Wuxi International Finance Square

339 m / 1,112 ft

3

Heartland 66 Office Tower

339 m / 1,112 ft

4

Hengqin International Finance Center

336.7 m / 1,105 ft

5

SLS Dubai

336 m / 1,102 ft

6

DAMAC Heights

335.1 m / 1,099 ft

7

Mandarin Oriental Hotel Tower A

333.1 m / 1,093 ft

8

Deji Plaza

324 m / 1,063 ft

9

Ocean Heights

310 m / 1,017 ft

10

C Future City East Tower

290.8 m / 954 ft

Awards

Changsha Hua Center Phase II Project

Award of Excellence: Changsha Hua Center Phase II Project

Best Tall Building 100-199 meters 2021

Ctbuh Leaders

Liu Yinsheng

Liu Yinsheng

CTBUH Regional Representative, 2018 – Present

Chengdu

Building Completions Timeline

 

Videos

17 October 2016

City Hubs

Our lives are adapting to a convenient, vibrant, and connected live-work dynamic, and our cities must change and respond to those new requirements. Much of...

View all

Research

17 October 2016

City Hubs

Our lives are adapting to a convenient, vibrant, and connected live-work dynamic, and our cities must change and respond to those new requirements. Much of...

View all

Global News

15 January 2020

Opening for Zhuhai Hotel Announced

Hyatt Hotels has announced the opening of the Hyatt Regency Hengqin in Zhuhai, China. It is geared towards both business and regular leisure guests. The...

View all

Associated companies

Rank
Name
City
Height

1

Pentominium Tower

Dubai

516 m

1,693 ft

2

Tianshan Gate of the World Plots 27 and 28

Shijiazhuang

450 m

1,476 ft

3

Wuxi International Finance Square

Wuxi

339 m

1,112 ft

4

Heartland 66 Office Tower

Wuhan

339 m

1,112 ft

5

Hengqin International Finance Center

Zhuhai

337 m

1,105 ft

6

SLS Dubai

Dubai

336 m

1,102 ft

7

DAMAC Heights

Dubai

335 m

1,099 ft

8

Mandarin Oriental Hotel Tower A

Chengdu

333 m

1,093 ft

9

Deji Plaza

Nanjing

324 m

1,063 ft

10

China South City Tower 1

Nanning

318 m

1,043 ft

11

Ocean Heights

Dubai

310 m

1,017 ft

12

C Future City East Tower

Shenzhen

291 m

954 ft

12

C Future City West Tower

Shenzhen

291 m

954 ft

14

Hengqin Headquarters Phase 2 Tower A

Zhuhai

289 m

948 ft

15

Chongqing Xinhua Bookstore Group Jiefangbei Book City Mixed-use Project

Chongqing

286 m

938 ft

16

Kempinski Residences Business Bay

Dubai

276 m

906 ft

17

Hengqin Headquarters Phase 2 Tower B

Zhuhai

270 m

886 ft

18

Suning Plaza Tower A

Xuzhou

266 m

873 ft

19

U-Bora Tower 1

Dubai

263 m

862 ft

20

Marina Gate II

Dubai

258 m

846 ft

21

Shenzhen Luohu Friendship Trading Centre

Shenzhen

250 m

820 ft

22

Bravo Park Place

Guangzhou

250 m

820 ft

23

Center 66 Office 1

Wuxi

250 m

820 ft

24

World Capital Tower

Jakarta

244 m

802 ft

25

R&F Center

Guangzhou

243 m

797 ft

26

Founder International Financial Center North Tower

Wuhan

238 m

781 ft

27

Empire Tower

Abu Dhabi

230 m

755 ft

28

Dawangjing 618 Tower 1

Beijing

227 m

745 ft

29

Center 66 Office 3

Wuxi

225 m

738 ft

30

Jumeirah Living Marina Gate

Dubai

224 m

736 ft

31

Mandarin Oriental Hotel Tower B

Chengdu

224 m

733 ft

32

Dawangjing 626 Tower 1

Beijing

220 m

722 ft

33

South Beach South Tower

Singapore

218 m

714 ft

34

South Beach North Tower

Singapore

218 m

714 ft

35

Dawangjing 626 Tower 2

Beijing

216 m

709 ft

36

Podium West Tower

Mandaluyong

210 m

689 ft

37

World Trade Centre 3

Jakarta

209 m

686 ft

38

Marina Bay Sands Hotel Tower 1

Singapore

207 m

679 ft

38

Marina Bay Sands Hotel Tower 3

Singapore

207 m

679 ft

40

Marina Gate I

Dubai

207 m

677 ft

41

Chongqing Plaza T1

Chongqing

207 m

677 ft

42

Heartland 66 Tower SA3

Wuhan

206 m

677 ft

43

Marina Bay Sands Hotel Tower 2

Singapore

203 m

665 ft

44

Chongqing Gaoke Taiyangzuo

Chongqing

202 m

662 ft

45

Suning Nanjing Tower 2

Nanjing

200 m

656 ft

46

Gmond International Building

Shenzhen

200 m

656 ft

47

Taichung Commercial Bank Headquarters

Taichung

200 m

656 ft

48

Center 66 Office 2

Wuxi

200 m

656 ft

49

Tianshan Gate of the World Block M

Shijiazhuang

200 m

656 ft

50

Soleil Danang by Wyndham Tower 1

Da Nang

199 m

653 ft

50

Soleil Danang by Wyndham Tower 2

Da Nang

199 m

653 ft

52

Sincere Financial Center Tower A

Chongqing

197 m

646 ft

52

Sincere Financial Center Tower B

Chongqing

197 m

646 ft

54

Evergrande Huazhi Office Tower

Chengdu

194 m

638 ft

55

Fortune Center

Xiamen

192 m

630 ft

56

Evergrande Huazhi Residential Tower 1

Chengdu

191 m

625 ft

56

Evergrande Huazhi Residential Tower 2

Chengdu

191 m

625 ft

58

Tyumen City 1

Tyumen

189 m

620 ft

59

Noble House

Jakarta

188 m

618 ft

60

Millennium Tower

Wuhan

187 m

614 ft

61

Heartland 66 Tower SA2

Wuhan

184 m

603 ft

62

First Avenue T1

Chongqing

177 m

581 ft

63

Century Jiangshang Tower 1

Wuhan

174 m

571 ft

63

Century Jiangshang Tower 2

Wuhan

174 m

571 ft

63

Century Jiangshang Tower 3

Wuhan

174 m

571 ft

63

Century Jiangshang Tower 4

Wuhan

174 m

571 ft

63

Century Jiangshang Tower 5

Wuhan

174 m

571 ft

63

Century Jiangshang Tower 6

Wuhan

174 m

571 ft

63

Century Jiangshang Tower 7

Wuhan

174 m

571 ft

63

Century Jiangshang Tower 8

Wuhan

174 m

571 ft

63

Century Jiangshang Tower 9

Wuhan

174 m

571 ft

72

Suning Nanjing Tower 3

Nanjing

170 m

558 ft

73

Dawangjing 618 Tower 3

Beijing

170 m

557 ft

74

Shining Towers A

Abu Dhabi

169 m

554 ft

75

Boulevard Plaza 1

Dubai

169 m

553 ft

76

Fortune Plaza Office Building II

Beijing

166 m

545 ft

77

National Trade Center

Taichung

165 m

542 ft

78

Heartland 66 Tower SA1

Wuhan

164 m

537 ft

79

World Trade Center 2

Jakarta

160 m

525 ft

80

Ellery Terrace, Kowloon

Hong Kong

157 m

513 ft

81

Dawangjing 618 Tower 2

Beijing

154 m

504 ft

82

Tyumen City 2

Tyumen

153 m

502 ft

83

Gold Finger Group Headquarters

Shijiazhuang

150 m

492 ft

84

Founder International Financial Center South Tower

Wuhan

150 m

492 ft

84

Tianshan Gate of the World Block K

Shijiazhuang

150 m

492 ft

84

Tianshan Gate of the World Medical Office Building

Shijiazhuang

150 m

492 ft

87

Evergrande Huazhi St. Regis Hotel

Chengdu

144 m

471 ft

88

Chongqing Plaza T2

Chongqing

142 m

465 ft

89

Boulevard Plaza 2

Dubai

141 m

463 ft

90

One AIA Financial Center

Foshan

141 m

461 ft

91

Suning Nanjing Tower 4

Nanjing

140 m

459 ft

92

Shining Towers B

Abu Dhabi

139 m

456 ft

93

Hua Center Phase II North Office Tower

Changsha

139 m

455 ft

94

Chongqing Plaza T0

Chongqing

139 m

455 ft

95

The Lana, East Tower

Tangerang

138 m

453 ft

95

The Lana, West Tower

Tangerang

138 m

453 ft

97

Chater House

Hong Kong

137 m

449 ft

98

La Marseillaise

Marseille

135 m

443 ft

99

CCB Tower

Hong Kong

134 m

440 ft

100

Tianshan Gate of the World Block D

Shijiazhuang

130 m

427 ft

100

Tianshan Gate of the World Block I

Shijiazhuang

130 m

427 ft

102

18 Kowloon East

Hong Kong

121 m

397 ft

103

Hotel Indigo Hong Kong Island

Hong Kong

113 m

370 ft

104

The Heron

London

112 m

367 ft

105

Tyumen City 3

Tyumen

111 m

364 ft

105

Tyumen City 4

Tyumen

111 m

364 ft

107

Hua Center Phase II South Office Tower

Changsha

105 m

345 ft

108

The Beacon

Hong Kong

105 m

343 ft

109

Novotown Cultural Office Tower

Zhuhai

100 m

328 ft

110

King-ray International Plaza Tower 1

Nanjing

100 m

328 ft

110

King-ray International Plaza Tower 2

Nanjing

100 m

328 ft

110

Tianshan Gate of the World Block C

Shijiazhuang

100 m

328 ft

110

Tianshan Gate of the World Block F

Shijiazhuang

100 m

328 ft

110

Tianshan Gate of the World Block G

Shijiazhuang

100 m

328 ft

110

Tianshan Gate of the World Block H

Shijiazhuang

100 m

328 ft

110

Tianshan Gate of the World Block J

Shijiazhuang

100 m

328 ft

110

Tianshan Gate of the World Block L

Shijiazhuang

100 m

328 ft

110

Tianshan Gate of the World Block N

Shijiazhuang

100 m

328 ft

110

Tianshan Gate of the World Block O

Shijiazhuang

100 m

328 ft

110

Tianshan Gate of the World Block P

Shijiazhuang

100 m

328 ft

110

Tianshan Gate of the World Block Q

Shijiazhuang

100 m

328 ft

110

Tianshan Gate of the World Block R

Shijiazhuang

100 m

328 ft

123

Chongqing Plaza T3

Chongqing

100 m

328 ft

124

Cleveland Clinic Abu Dhabi Hospital

Abu Dhabi

100 m

327 ft

125

Hengqin International Hi-tech Innovation Park R&D Tower 1

Zhuhai

99 m

324 ft

125

Hengqin International Hi-tech Innovation Park R&D Tower 2

Zhuhai

99 m

324 ft

127

Hengqin International Hi-tech Innovation Park Apartments 1

Zhuhai

96 m

313 ft

127

Hengqin International Hi-tech Innovation Park Apartments 2

Zhuhai

96 m

313 ft

129

Exchange Square

Phnom Penh

90 m

295 ft

130

Hyatt Regency Hengqin

Zhuhai

87 m

285 ft

131

U-Bora Tower 2

Dubai

83 m

272 ft

132

Sands Macao

Macau

79 m

259 ft

133

Hengqin International Hi-tech Innovation Park Accelerator Building 1

Zhuhai

78 m

255 ft

133

Hengqin International Hi-tech Innovation Park Accelerator Building 2

Zhuhai

78 m

255 ft

135

Lè Architecture

Taipei

72 m

235 ft

136

Punggol Waterway Terraces 1

Singapore

61 m

200 ft

136

Punggol Waterway Terraces 2

Singapore

61 m

200 ft

138

Hengqin International Hi-tech Innovation Park Incubator Building

Zhuhai

60 m

195 ft

139

Greenland Jade Palace Tower 5

Johor Bahru

- m

- ft

140

Greenland Jade Palace Tower 4

Johor Bahru

- m

- ft

140

Greenland Jade Palace Tower 6

Johor Bahru

- m

- ft

140

Soleil Danang by Wyndham Tower 3

Da Nang

- m

- ft

140

Soleil Danang by Wyndham Tower 4

Da Nang

- m

- ft

144

Greenland Jade Palace Tower 11

Johor Bahru

- m

- ft

144

Greenland Jade Palace Tower 7

Johor Bahru

- m

- ft

146

Greenland Jade Palace Tower 10

Johor Bahru

- m

- ft

146

Greenland Jade Palace Tower 3

Johor Bahru

- m

- ft

148

Greenland Jade Palace Tower 2

Johor Bahru

- m

- ft

148

Greenland Jade Palace Tower 8

Johor Bahru

- m

- ft

150

Alacarte Halong Bay Condotel

Hanoi

- m

- ft

151

Greenland Jade Palace Tower 9

Johor Bahru

- m

- ft

152

Greenland Jade Palace Tower 1

Johor Bahru

- m

- ft

153

Ciputra International Apartment Tower 1

Jakarta

- m

- ft

154

10 BKC

Mumbai

- m

- ft

155

Langham Place Guangzhou

Guangzhou

- m

- ft

155

Novotown Cultural Workshop

Zhuhai

- m

- ft

157

Abdul Latif Jameel Headquarters

Jeddah

- m

- ft

157

Gemdale Changshou Road

Shanghai

- m

- ft

159

Ciputra International Office Tower 3

Jakarta

- m

- ft

160

Aria Residence

Kuala Lumpur

- m

- ft

160

Guangzhou Commercial Showcase

Guangzhou

- m

- ft

160

Shanghai Expo Plot A13A-01 Project

Shanghai

- m

- ft

160

Taipei Nangang Office Tower

Taipei

- m

- ft

164

Ciputra International Office Tower 1

Jakarta

- m

- ft

164

Ciputra International Office Tower 2

Jakarta

- m

- ft

166

Ciputra International Apartment Tower 2

Jakarta

- m

- ft

166

Ciputra International Hotel

Jakarta

- m

- ft

166

Ciputra International Office Tower 4

Jakarta

- m

- ft

166

Ciputra International Office Tower 5

Jakarta

- m

- ft

166

Ciputra International Office Tower 6

Jakarta

- m

- ft

166

Ciputra International Residential Tower 3

Jakarta

- m

- ft

166

Greenland Jade Palace Tower 12

Johor Bahru

- m

- ft

166

Greenland Jade Palace Tower 13

Johor Bahru

- m

- ft

166

Hengqin CRCC Plaza Tower 1

Zhuhai

- m

- ft

166

Hengqin CRCC Plaza Tower 2

Zhuhai

- m

- ft

166

Hengqin CRCC Plaza Tower 3

Zhuhai

- m

- ft

166

Hengqin CRCC Plaza Tower 4

Zhuhai

- m

- ft

166

Nansha Kingboard Free Trade Zone Mixed-use Project

Guangzhou

- m

- ft

166

Taipei Panco Hotel

Taipei

- m

- ft

166

Tebrau Waterfront Residences Tower 1

Johor Bahru

- m

- ft

166

Tebrau Waterfront Residences Tower 10

Johor Bahru

- m

- ft

166

Tebrau Waterfront Residences Tower 11

Johor Bahru

- m

- ft

166

Tebrau Waterfront Residences Tower 12

Johor Bahru

- m

- ft

166

Tebrau Waterfront Residences Tower 13

Johor Bahru

- m

- ft

166

Tebrau Waterfront Residences Tower 14

Johor Bahru

- m

- ft

166

Tebrau Waterfront Residences Tower 15

Johor Bahru

- m

- ft

166

Tebrau Waterfront Residences Tower 16

Johor Bahru

- m

- ft

166

Tebrau Waterfront Residences Tower 17

Johor Bahru

- m

- ft

166

Tebrau Waterfront Residences Tower 18

Johor Bahru

- m

- ft

166

Tebrau Waterfront Residences Tower 19

Johor Bahru

- m

- ft

166

Tebrau Waterfront Residences Tower 2

Johor Bahru

- m

- ft

166

Tebrau Waterfront Residences Tower 20

Johor Bahru

- m

- ft

166

Tebrau Waterfront Residences Tower 21

Johor Bahru

- m

- ft

166

Tebrau Waterfront Residences Tower 22

Johor Bahru

- m

- ft

166

Tebrau Waterfront Residences Tower 23

Johor Bahru

- m

- ft

166

Tebrau Waterfront Residences Tower 24

Johor Bahru

- m

- ft

166

Tebrau Waterfront Residences Tower 25

Johor Bahru

- m

- ft

166

Tebrau Waterfront Residences Tower 26

Johor Bahru

- m

- ft

166

Tebrau Waterfront Residences Tower 27

Johor Bahru

- m

- ft

166

Tebrau Waterfront Residences Tower 28

Johor Bahru

- m

- ft

166

Tebrau Waterfront Residences Tower 29

Johor Bahru

- m

- ft

166

Tebrau Waterfront Residences Tower 3

Johor Bahru

- m

- ft

166

Tebrau Waterfront Residences Tower 30

Johor Bahru

- m

- ft

166

Tebrau Waterfront Residences Tower 31

Johor Bahru

- m

- ft

166

Tebrau Waterfront Residences Tower 32

Johor Bahru

- m

- ft

166

Tebrau Waterfront Residences Tower 33

Johor Bahru

- m

- ft

166

Tebrau Waterfront Residences Tower 34

Johor Bahru

- m

- ft

166

Tebrau Waterfront Residences Tower 4

Johor Bahru

- m

- ft

166

Tebrau Waterfront Residences Tower 5

Johor Bahru

- m

- ft

166

Tebrau Waterfront Residences Tower 6

Johor Bahru

- m

- ft

166

Tebrau Waterfront Residences Tower 7

Johor Bahru

- m

- ft

166

Tebrau Waterfront Residences Tower 8

Johor Bahru

- m

- ft

166

Tebrau Waterfront Residences Tower 9

Johor Bahru

- m

- ft

166

Vanke Tianfu Cloud City Apartment Tower 1

Chengdu

- m

- ft

166

Vanke Tianfu Cloud City Apartment Tower 2

Chengdu

- m

- ft

166

Vanke Tianfu Cloud City Hotel

Chengdu

- m

- ft

166

Vanke Tianfu Cloud City Office Tower 1

Chengdu

- m

- ft

166

Vanke Tianfu Cloud City Office Tower 2

Chengdu

- m

- ft

166

Vanke Tianfu Cloud City SOHO Tower

Chengdu

- m

- ft

Statistics

150 m+ Buildings

300 m+ Buildings

Average Building Age*

10 Years

Most Common Function*

Office (37%), 50 Buildings

Most Common Material*

Concrete (73%), 66 Buildings

* Based on 150 m+ buildings currently in the database.

Total: 135 Buildings for which a function has been assigned.
 
Total: 91 Buildings for which a material has been assigned.
 

*Based on 135 Completed & Under Construction Buildings

Building Completions Timeline

 

Construction Time Chart

NOTE: Construction start time is not available for all buildings. The average construction time is only displayed if there is three or more buildings with construction start and complete data in that year.

 

17 October 2016 | Shenzhen

City Hubs

Our lives are adapting to a convenient, vibrant, and connected live-work dynamic, and our cities must change and respond to those new requirements. Much of...

17 October 2016 | Shenzhen

CTBUH 2016 China Conference - Session 3a: Tall Buildings and Urban Habitat Q&A

Monday, October 17, 2016. Shenzhen, China. Richard Witt, Quadrangle Architects; James von Klamperer Kohn Pedersen Fox Associates; Keith Griffiths, Aedas; Peter Brannan, Arquitectonica answer questions...

17 October 2016 | Shenzhen

CTBUH Video Interview – Keith Griffiths

Keith Griffiths of Aedas is interviewed by Chris Bentley during the 2016 CTBUH China Conference. Chris discusses the concept of city hubs and the methodology...

13 February 2013 | Chicago

What is the Key to Making Modern Tall Buildings "Liveable"?

Industry leaders answering this question include: Aybars Asci, SOM; Peter Chipchase, Arup; Henry Cobb, Pei Cobb Freed; Christoph Ingenhoven, ingenhoven architects; Helmut Jahn, Murphy/Jahn; Peter...

18 January 2013 | Shanghai

How Will Tall Buildings be Different in 20 Years?

Industry leaders answering this question include: Kenneth Drucker, HOK; James Goettsch, Goettsch Partners; Keith Griffiths, Aedas; David Malott, KPF; Adrian Smith, AS+GG; Rafael Viñoly, Rafael...

19 September 2012 | Shanghai

Effective & Sustainable Tall Buildings: A Blueprint for the Future

This presentation discussed the “Future Office” study focusing on the principle of exploring simultaneously the environmental, social, and economic sustainability of a tall building (i.e....

19 September 2012 | Shanghai

Track 9: Economics & Marketing Q & A

Track 9 Panel consisting of: Steve Watts, AECOM; Judit Kimpian, Aedas; Nigel Smith, CBRE HK; & William Murray, Wordsearch took questions from delegates.

17 October 2016

City Hubs

Keith Griffiths, Aedas

Our lives are adapting to a convenient, vibrant, and connected live-work dynamic, and our cities must change and respond to those new requirements. Much of...

17 October 2016

Cities to Megacities: Perspectives

CTBUH 2016 Conference Speakers

The CTBUH 2016 International Conference is being held in the three cities of the Pearl River Delta, the world’s largest “megacity,” projected to have 120...

19 September 2012

Effective & Sustainable Tall Buildings: A Blueprint for the Future

Steve Watts, Davis Langdon; Judit Kimpian, Aedas

The ‘Future Office’ Study responded to the challenge of creating a tall office buildings in central London for half the current benchmark – without compromising...

15 January 2020

Opening for Zhuhai Hotel Announced

Hyatt Hotels has announced the opening of the Hyatt Regency Hengqin in Zhuhai, China. It is geared towards both business and regular leisure guests. The...

15 November 2019

Changsha Hua Center Phase II Completes

Huayuan Group’s Changsha Hua Center Phase II project, located in the center of the old city of Changsha, is now complete and ready for occupants....

15 November 2019

Changsha Hua Center Phase II Completes

Huayuan Group’s Changsha Hua Center Phase II project, located in the center of the old city of Changsha, is now complete and ready for occupants....

CTBUH Initiatives Involving Aedas

CTBUH 2016 Conference Gold Sponsor

16–21 October 2016

Cities to Megacities: Shaping Dense Vertical Urbanism takes place progressively across three Chinese cities: Shenzhen, Guangzhou, and Hong Kong.

Top Company Rankings: The World’s 100 Tallest Buildings

13 October 2016

The Council is pleased to announce the Top Company Rankings for numerous disciplines as derived from the list of projects appearing in 100 of the World’s Tallest Buildings.

CTBUH Beijing Inaugural Event

22 April 2015

CTBUH Beijing's inaugural event featured presentations: "The New Fire Code on Tall Building Design" and "The Development of Beijing’s Central Business District".

Young Professionals Hosts Meeting at the 2012 Awards Symposium

18 October 2012

Exactly one year after its establishment the CTBUH Young Professionals Committee gathered at the Awards Symposium on October 18 at the Illinois Institute of Technology.

Sustainability Workshop, Shanghai

18 September 2012

The CTBUH Tall Buildings and Sustainability Working Group convened the day before the start of the Shanghai Congress to review recent progress and focus on goals for the future.

Discovering Asia, from Moscow

23 April–02 May 2009

Elena Shuvalova, the CTBUH Country Representative for Russia reports on the 4th Russian Intellectual Business.

Ctbuh Leaders At Aedas

Liu Yinsheng

CTBUH Regional Representative, 2018 – Present

Liu Yinsheng

Chengdu