A presentation given at the Global Bamboo and Rattan Congress (BARC 2018), 25-27 June 2018.

1. The research on performance for
timber/bamboo-concrete composite structure
Prof. Guojing He
Bridge Engineering Institute
2018.06.26

2. Contents
Shear capacity
1
TCC beam behavior
2
TCC bridge performance
3
Conclusion
4

3. Shear capacity
Concrete slab
Timber/bamboo beam
Shear connector
Timber/bamboo beam Cross gird
Timber/bamboo-concrete composite beam
Timber/bamboo-concrete composite structure
Compression force: concrete slab
Tension force: timber/bamboo
Shear force: shear connector
Shear capacity: push-out test
Timber: Northeastern Larix
Concrete: C30
Concrete slab

4. Shear capacity
— Notch-stud connector
0 2 4 6 8 1 0 1 2
0
2 0
4 0
6 0
8 0
1 0 0
1 2 0
试 验 曲 线
有 限 元 法
荷载KN
滑 移 m m

5. Shear capacity
— PBL connector

6. Shear capacity
— Angle steel connector

7. Shear capacity
lPBL , angle steel and notch-stud connectors are partial rigid
shear connectors.
lThe shear capacity and stiffness increased with the plane
dimensions of notch and the diameter of stud. However, the
slip decreased

8. TCC beam behavior
— with angle steel connector
Connectors arrangement of composite beams(span:3m)
Cross section
Production of timber-concrete composite beam

9. TCC beam behavior
— with angle steel connector
Loading arrangement of composite beam
The load-slip curve The load-deflection curveFailure mode

10. TCC beam behavior
— with notch-stud connector
Connectors arrangement of composite beams（span:8m） Cross section
Production of timber-concrete composite beam

11. TCC beam behavior
— with notch-stud connector
Loading equipment The load-slip curve The load-deflection curve
Loading arrangement of composite beam

12. TCC beam behavior
lElastic behavior: load-slip and load-displacement are linear
there is one neutral axis in composite beam
strain distribution is linear along cross section
lFailure mode: ductile failure( with large displacement in
vertical and slip in longitudinal).

13. TCC bridge performance
— Dimensions
Elevation of Timber-concrete composite beam bridge（mm）
Cross section of Timber-concrete composite beam bridge（mm）
Layout of the shear connectors（mm）

14. TCC bridge performance
— Construction
Concrete pouring and curing Simple supported TCC beam bridge
FormworksConnecting the cross and main beam

15. TCC bridge performance
— Static test
Layout of the measurements
Strain distributions in middle-span section with load steps

16. TCC bridge performance
— Static test
Load-slip curve(at two end sections) Load-displacement curve
(at 1/4、3/4 and 1/2 -span sections)

17. TCC bridge performance
— Static test
Strain distribution in concrete slab and timber beam

18. TCC bridge performance
— Dynamic test
Dynamic test under ambient vibrationDynamic test with impact

19. TCC bridge performance
— Dynamic test
1st modal shape
2nd modal
shape
3rd modal
shape

20. TCC bridge performance
— Dynamic test
No. of Freq. Test of Freq. (Hz)/Damp Calculated Freq.(Hz)
1 13.528/3.92% 9.711
2 19.612/2.15% 14.155
3 33.189/1.36% 30.431
Experimental fundamental frequency of composite beam bridge
The first 3 experimental and calculated frequencies of TCC beam bridge

21. TCC bridge performance
l Neutral axis is located near to the top of timber beam
l Strain distribution is linear with the height of composite section
l The maximum displacement and stress are at the middle span, and
more less than the limit in Code.
l The measurement results in static and dynamic test are good agree
with the calculated results.

22. Conclusions
1、Notch-stud shear connector is a suitable and reliable connector in
engineering.
2、Timber/bamboo-concrete composite structure can be used in
building and bridge structures.
3、The strength and stiffness of TCC bridge are satisfied with the
requirements of highway load-II.