Recent research on Timber Engineering at Tongji University. Minjuan HE Tongji University, Shanghai, China

Transcription

1 Recent research on Timber Engineering at Tongji University Minjuan HE Tongji University, Shanghai, China Aug. 20,

2 Outline 1 History of timber structures in china 2 Important issues on the development of timber structures in China 3 Recent research on timber engineering at Tongji University 4 Prospect Aug. 20,

3 1 History of timber structures in china Timber sturctures has a very long history in China. About 3500 years ago, Chinese started to build post and beam timber constructions connected by mortise and tenon. Tenon Dougong Aug. 20,

4 1 History of timber structures in china Now a lot of timber palace, temples and pagodas are still in existence. Foguang Temple Built in 857 A.D. It is 34m in length and 17.77m in width. Aug. 20,

5 1 History of timber structures in china Yingxian Wooden Pagoda (built in 1056 A.D. ) It is 67 m in height. The pagoda is a 9-story octagonal building and was constructed without using any metal connectors. It is also one of the tallest ancient wooden buildings in the world. Aug. 20,

6 1 History of timber structures in china Hundreds of year ago, a lot of large scale timber constructions were built. Aug. 20,

7 1 History of timber structures in china From 50s to 70s last century, brick or concrete - timber hybrid structures were built in lot of areas. Aug. 20,

8 2 Issues on the development of timber structures in China In the 1980s, concerning the large population and shortage of wood resource, our government restricted people to use timber as construction material. Aug. 20,

9 2 Issues on the development of timber structures in China Recent ten years, with the increasing of imported wood resource and local fast planted forest, our government encourage to use timber as a kind of building material. Aug. 20,

10 2 Issues on the development of timber structures in China Wood frame constructions in resident houses Vancouver Garden in Beijing Villa in Shanghai Aug. 20,

11 2 Issues on the development of timber structures in China Wood frame constructions in public buildings Xiang'e school in Dujiangyan Tourism Buildings in Sichuan Aug. 20, Conference center in Caofeidian, Hebei Province

12 2 Issues on the development of timber structures in China Glulam Structures in public buildings A Toll gate in Yunnan province Aug. 20, 2013 Entrance of Chengdu Happy Valley 12 Shanghai Roller coaster

13 2 Issues on the development of timber structures in China Glulam Structures in public buildings Bridge in a golf club Shanghai A club in residential area Beijing Aug. 20,

14 2 Issues on the development of timber structures in China Glulam Structures in public buildings Building-selling center in Wanke Jilin 2610 m 2 Tourism center in Qindao 1800 m 2 Aug. 20,

15 2 Issues on the development of timber structures in China Glulam Structures in public buildings Norway Pavilion, consists of fifteen assembled trees. Each tree structure is constructed of laminated timber. After the Expo each tree can be easily moved and become part of a new landscape elsewhere Shanghai Expo Building- Norway Pavilion Aug. 20,

16 2 Issues on the development of timber structures in China Glulam Structures in public buildings 2010 Shanghai Expo Building- Swedish Pavilion The cube as the entrance is post and beam construction made of Glulam. Aug. 20,

17 2 Issues on the development of timber structures in China Glulam Structures in reconstruction of temples Xiangji Temple in Hangzhou Aug. 20,

18 2 Issues on the development of timber structures in China Glulam Structures in reconstruction of temples Laojunge in Sichuan Aug. 20,

19 2 Issues on the development of timber structures in China Hybrid Structures 2010 Shanghai Expo Building - Vancouver Pavilion It is a three-story wooden-concrete hybrid building. The first floor is reinforced concrete frame-shear wall structure and the second to third floor is timber structure. Aug. 20,

20 2 Issues on the development of timber structures in China Wood frame resident houses: (1) How to solve the problem of limited land resource? (2) Glulam structures are more favored. Wood frame works as wall panel. Glulam constructions: How to increase lateral resistant strength and rigidity for postbeam construction? Timber constructions: How to increase the ratio of land utilization? Aug. 20,

21 3 Research on Timber Engineering at Tongji University Wood frame constructions (1) Tests and analysis for wood trusses Load bearing capacity test 加载等级 Failure mode 加载等级 - 跨中挠度 WT1 WT2 WT3 WT 跨中挠度 (mm) Aug. 20, Load-displacement curve

22 3 Research on Timber Engineering at Tongji University Wood frame constructions (2) Connections Tooth plate connections Aug. 20, Joist hanger

23 3 Research on Timber Engineering at Tongji University Wood frame constructions (3) Shear walls Joint j Shear (U3) Shear wall tests Shear wall modeling Shear (U2) Joint i or the base Compare between different wood-based panels The lateral resistant ability of gypsum in share wall Aug. 20, Numerical modeling of shear wall

24 3 Research on Timber Engineering at Tongji University Wood frame constructions (4) Seismic performance - shaking table tests Light wood frame building Aug. 20,

25 3 Research on Timber Engineering at Tongji University Wood frame constructions (5) 3D Numerical modeling Simplified model Nonlinear FE model for time-history analysis Aug. 20,

26 3 Research on Timber Engineering at Tongji University Wood frame constructions (6) Numerical modeling based on field measurement Aug. 20,

27 3 Research on Timber Engineering at Tongji University Glulam constructions (1) Performance of post-beam joists 150x270 glued lumber 200x200 glued lumber Aug. 20,

28 3 Research on Timber Engineering at Tongji University Glulam constructions (2) Lateral performance combining of wood frame and post-beam The wood frame shear walls are used to increase the lateral resistance for this kind of composite structural system. Aug. 20,

29 3 Research on Timber Engineering at Tongji University Glulam constructions (3) Numerical Modeling based on test result Up-lift of stud Failure Mode Numerical Model Aug. 20,

30 3 Research on Timber Engineering at Tongji University Glulam constructions (4) Full size connection tests of real project Aug. 20,

31 3 Research on Timber Engineering at Tongji University Hybrid constructions (1) Comparison between timber floor and steel-concrete composite floor For timber floor: Decrease total structure weight: 23% Decrease seismic action: 32% Decrease vertical load on foundation: 48% Aug. 20,

32 3 Research on Timber Engineering at Tongji University Hybrid constructions (2) Timber and concrete structure test Aug. 20,

33 Load(kN) 3 Research on Timber Engineering at Tongji University Hybrid constructions (3) Timber and concrete structure modeling the hysteretic curve of point load(kn) displacement(mm) 荷载 (kn) #5 测点骨架曲线 The hysteretic curve of point Fu: 42.61, Fy: 24.6, , Fy: , Numerical Model Fu: , 位移 (mm) #5 测点实测骨架曲线 #5 测点拟合骨架曲线 Aug. 20, 2013 Test curve fitting curve 33

34 3 Research on Timber Engineering at Tongji University Hybrid constructions (4) Shaking table tests of timber concrete hybrid structure 3-storey hybrid building Aug. 20,

35 3 Research on Timber Engineering at Tongji University Hybrid constructions (5) Steel - timber hybrid structure -1 Timber-steel hybrid structure Timber diaphragm Steel moment resisting frame Light wood-framed shear wall Horizontal system Vertical system Aug. 20,

36 3 Research on Timber Engineering at Tongji University Hybrid constructions (5) Steel - timber hybrid structure -2 Aug. 20,

37 3 Research on Timber Engineering at Tongji University Hybrid constructions (5) Steel - timber hybrid structure -3 Aug. 20,

38 3 Research on Timber Engineering at Tongji University Hybrid constructions (5) Steel - timber hybrid structure -4 Reversed cyclic loading test Aug. 20, Failure modes

39 3 Research on Timber Engineering at Tongji University Hybrid constructions (5) Steel - timber hybrid structure -5 Timber-steel connection test Wood nail connection test Aug. 20,

40 3 Research on Timber Engineering at Tongji University Hybrid constructions (5) Steel - timber hybrid structure -6 In-plane test for timber-steel hybrid diaphragm Aug. 20,

41 3 Research on Timber Engineering at Tongji University Hybrid constructions (5) Steel - timber hybrid structure -7 Numerical modeling Aug. 20,

42 4 Prospect Issues on natural resource saving, energy-efficient technique and low carbon emissions etc. can not be ignored in the development of construction industry. There will be more opportunities for timber constructions in China. Because of large population and lack of land resource in China, multi-storey timber and timber hybrid buildings may be a reasonable alternative. Aug. 20,

43 Thanks for your attention! Aug. 20,