NCREE Releases MS-DCSS-V2024 Software for Multispiral Column Discrete Shear Evaluation
Structures · Construction methods
Taiwan's National Center for Research on Earthquake Engineering (NCREE) released technical report NCREE-2026-004, introducing MS-DCSS-V2024 for column shear calculation. The tool refines discrete shear models, accounts for reinforcement across total section depth h, and allows independent spiral spacing. Validated against 41 experimental column specimens, it has been made available via web and desktop versions.
The National Center for Research on Earthquake Engineering (NCREE) published technical report NCREE-2026-004 on July 27, 2026, authored by Yu-Chen Ou, Yong-Chen Li, and Che-Yen Li, presenting the MS-DCSS-V2024 shear strength calculation software. Conventional design formulas like Caltrans SDC can overestimate effective shear areas in small-spiral arrangements, producing unconservative results. The updated software calculates transverse reinforcement contributions over the full section depth h to decouple outer concrete boundary constraints and enables independent spacing inputs for individual spirals. Verification across 41 experimental specimens showed the ratio of calculated spiral shear strength to simplified formulas averaged 1.01. For 12 shear-failure specimens, the average ratio of measured ultimate shear to nominal strength was 1.63, while 27 flexural-failure specimens averaged 0.71. The tool is available for download and web access to aid structural engineers.
Key takeaways
- Standard simplified formulas risk overestimating shear area in small-spiral layouts; MS-DCSS-V2024 accounts for transverse bars across the entire depth h without cross-section shape constraints.
- The tool allows independent spiral spacing inputs for flexible rebar detailing, with calculated shear strength matching simplified formulas at an average ratio of 1.01.
- Experimental verification on 41 specimens showed an average measured-to-nominal strength ratio of 1.63 for 12 shear-critical columns and 0.71 for 27 flexural-critical columns.
Source：國家地震工程研究中心 Read the original ↗
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