A study of the reinforcement of steel plates into RC cantilever stairs to reduce vibration effects from human walking activities

Name: Lythean Mao

Organization : Burapha University. Faculty of Engineering

Name: Sopheak Seng

Organization : Burapha University. Faculty of Engineering

Name: Amornchai Jaiyong

Organization : Burapha University. Faculty of Engineering

Email : jaiyong@eng.buu.ac.th

keyword: Reinforced concrete staircase

ThaSH: Concrete beams -- Reinforcement

; Human walking load

ThaSH: Vibration -- Measurement

ThaSH: Mechanical vibration

Abstract: Static loadings resistance is always the first design criteria. However, further investigation should also be conducted for a structure like floors, bridges, and stairs which are subjected to dynamic loadings in the form of human activities such as walking, running, or jumping; these loadings often result in vibrational effects associated with the user's comfort. While most researches were mostly about walking force on flat surfaces, this study will mainly focus on reinforced concrete cantilever staircase which has been reported to encounter a significant level of vibration due to periodic walking motion. Therefore, this paper presents the attempt to study the characteristics and response of RC cantilever stair design once being subjected to human-induced vibration and to propose the application of extra reinforcing steel used to lessen the dynamic effects. Numerical analysis is done on an RC cantilever stairs model having dimensions of 100 centimeters in length, and 25 centimeters in width. To keep the concept of "modern" structures, the thickness is maintained to be only 10 centimeters. Both ascending and descending motions are performed, and acceleration data is collected for evaluation. The analysis is mainly done based on the equation of motion; thus, it is important to determine all the associated parameters such as single lumped mass, static force, damping force, and the human walking force. To obtain all these parameters, several theories are used such as force-displacement relation, composite materials (FEM), virtual work method, and Fourier series. A little experiment has to be conducted before we can use the Fourier series to get the equation that represents human walking force with respect to time. With the help of MATLAB software, the equation of motion which is in the function of second order differential equation could be easily solved. For the proposed reinforcement measures to be proven effective, several parameters must satisfy the recommended design criteria which are shear force, bending moment, deflection, and acceleration. The benefits of implementing this project are reducing user's discomfort due to vibration within the staircase structure by introducing innovative reinforcement patterns while still maintaining slender dimensions as specified in the architectural plans.

King Mongkut's University of Technology North Bangkok. Central Library

Address: BANGKOK

Email: library@kmutnb.ac.th

Created: 2020

Modified: 2025-08-04

Issued: 2025-08-04

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BibliograpyCitation : ใน วิศวกรรมสถานแห่งประเทศไทย ในพระบรมราชูปถัมภ์ ร่วมกับ ภาควิชาวิศวกรรมโยธา คณะวิศวกรรมศาสตร์ มหาวิทยาลัยบูรพา, สาขาวิชาวิศวกรรมโยธา คณะเทคโนโลยีอุตสาหกรรม มหาวิทยาลัยราชภัฏรำไพพรรณี และภาควิชาวิศวกรรมโยธา คณะวิศวกรรมศาสตร์ศรีราชา มหาวิทยาลัยเกษตรศาสตร์ วิทยาเขตศรีราชา. การประชุมวิชาการวิศวกรรมโยธาแห่งชาติ ครั้งที่ 25 (NCCE 25) (pp.1095-1102). ชลบุรี : มหาวิทยาลัยบูรพา

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