Yu et al. (2018) — Feasibility of using ultra-high ductility cementitious...

Citation

Kequan Yu, Lingzhi Li, Jiangtao Yu, Jianzhuang Xiao, Junhong Ye, Yichao Wang (2018). Feasibility of using ultra-high ductility cementitious composites for concrete structures without steel rebar. Engineering Structures, Vol. 170, pp. 11-20.

DOI: 10.1016/j.engstruct.2018.05.037
Atlas layer: extension
Related Victor Li book chapter: Chapter 6: Structural Applications; Chapter 5: Advanced ECC
Source PDF: yu-2018-feasibility-of-using-ultra-high-ductility.pdf
Extracted text: atlas/full_text/yu-2018-feasibility-of-using-ultra-high-ductility_full_text.md
Source note: atlas/source_notes/yu-2018-feasibility-of-using-ultra-high-ductility_source_note.md

Why this paper matters

Landmark multi-scale experimental study proving the feasibility of rebar-free concrete construction using Ultra-High Ductility Cementitious Composites (UHDCC) with tensile strain capacity up to 13.55%, demonstrating that a 1/4-scale rebar-free UHDCC frame survives severe earthquake shaking table tests up to PGA = 1.178 g.

Main contribution

Formulated three UHDCC systems: UA ($f_c = 45.9\text{ MPa}$, $\varepsilon_{tu} = 11.98\%$), UB ($f_c = 12.9\text{ MPa}$, $\varepsilon_{tu} = 13.55\%$), and UC ($f_c = 118.5\text{ MPa}$, $\sigma_{tu} = 19.2\text{ MPa}$, $\varepsilon_{tu} = 8.70\%$).
Proved that plain UHDCC beams match the load capacity of RC beams with 0.5–1.5% rebar, and plain columns match RC columns with 0.8% rebar.
Demonstrated on a shaking table that a 1/4-scale non-steel reinforced UHDCC frame survives PGA of 0.105 g to 1.178 g without collapse.

Evidence summary

Material tensile properties:
UA: $\sigma_{tu} = 6.07\text{ MPa}$, $\varepsilon_{tu} = 11.98\%$, $f_c = 45.86\text{ MPa}$
UB: $\sigma_{tu} = 4.97\text{ MPa}$, $\varepsilon_{tu} = 13.55\%$, $f_c = 12.85\text{ MPa}$
UC: $\sigma_{tu} = 19.20\text{ MPa}$, $\varepsilon_{tu} = 8.70\%$, $f_c = 118.50\text{ MPa}$ (Table 6, page 15).
Member-level performance: Plain UHDCC beams (UA, UB, UC) matched RC beams (0.57–1.51% rebar); deflection-to-span ratio $>1/50$.
Structural seismic performance: Survived 3 ground motions from PGA = 0.105 g up to 1.178 g with excellent inter-story drift control.

Linked Atlas nodes

02_concepts/extreme_ductility_ecc.md
02_concepts/strain_hardening_criteria.md
05_experiments/direct_tensile_test.md

Claim-evidence rows to add

Atlas node	Claim	Evidence summary	Page/Figure/Table	Status
`02_concepts/extreme_ductility_ecc.md`	UHDCC achieves direct tensile strain capacity up to 13.55% (UB) and tensile strength of 19.20 MPa with 8.70% strain (UC).	Measured tensile strain capacities ranged from 8.70% to 13.55% under uniaxial tension tests.	Pages 11, 15, Section 4.1, Table 6	verified_from_pdf
`02_concepts/extreme_ductility_ecc.md`	A 1/4-scale rebar-free UHDCC frame survived severe shaking table earthquake tests with PGA up to 1.178 g without collapse.	Shaking table testing confirmed rebar-free frame maintained structural integrity up to PGA = 1.178 g.	Page 11, Abstract; Section 4.3	verified_from_pdf

Verification status

PDF preserved: yes (yu-2018-feasibility-of-using-ultra-high-ductility.pdf)
Text extracted: yes (atlas/full_text/yu-2018-feasibility-of-using-ultra-high-ductility_full_text.md)
DOI verified: yes (10.1016/j.engstruct.2018.05.037)
Page/figure/table verified: yes
Claim-evidence matrix ready: yes

Cautions

Frame test was conducted on 1/4-scale model; full-scale implementation requires further structural detailing.