Evaluation of nonlinear seismic response of mid-rise buildings with RC walls and infill walls by using a modified response spectrum analysis (MRSA) method | |
| Author | Pradhananga, Anuj |
| Call Number | AIT Thesis no.ST-20-13 |
| Subject(s) | Reinforced concrete construction--Earthquake effects Buildings, Reinforced concrete--Earthquake effects Buildings|xEarthquake effects |
| Note | A thesis submitted in partial fulfillment of the requirements for the degree of Master of Engineering in Structural Engineering, School of Engineering and Technology |
| Publisher | Asian Institute of Technology |
| Series Statement | Thesis ; no. ST-20-13 |
| Abstract | Reinforced concrete moment resisting frames structures are very common for Midrise buildings in developing countries. The provision of RC shear walls for lateral load resistance with the increase in height of the building is seen in many mid-rise constructions. Proper analysis and design are very essential for the building to perform well during an earthquake. The interaction of RC wall with the frame structures and the effect of infill walls might change the seismic performance of the building from the expected. Equivalent lateral Force method, used by many practicing engineers, cannot provide an accurate estimation of the seismic response. In addition, practicing engineers also use Standard Response spectrum analysis (RSA) as prescribed in many codes. However, recent studies have shown that RSA method significantly underestimate the inelastic seismic demand of low to mid-rise buildings. Different modes undergo different level of nonlinearity and using the same Response reduction factor(R) for each mode is not always valid. Nonlinear Linear response history analysis (NLRHA) is considered to be the most accurate method to predict the seismic behaviour of the building. However, an average practicing engineer doesn’t have the required analysis skill and resources to perform a NLRHA. To overcome the complexity imposed by NLRHA and inaccuracy of standard RSA to predict the structural response, a simplified analysis procedure is necessary for analysis of RC buildings. This study presents a Modified Response spectrum Analysis (MRSA) procedure to evaluate the Seismic response of the building without any nonlinear modelling. MRSA is based on the concept of Uncoupled Modal Response History Analysis (UMRHA) and Equivalent linearization (EL) Techniques. The basic idea lies on decomposing a nonlinear system to individual significant vibration modes represented by an inelastic SDOF system using UMRHA, which are further converted to a linear system using Equivalent linearization technique. Each linear system, represented by an elongated time period and higher viscous damping, is finally analyzed using the standard RSA Procedure. The nonlinear seismic demand is obtained by combining the response of each linear system. The method provides an alternative to predicting the nonlinear response of the building without any nonlinear modelling. |
| Year | 2020 |
| Corresponding Series Added Entry | Asian Institute of Technology. Thesis ; no. ST-20-13 |
| Type | Thesis |
| School | School of Engineering and Technology (SET) |
| Department | Department of Civil and Infrastucture Engineering (DCIE) |
| Academic Program/FoS | Structural Engineering (STE) /Former Name = Structural Engineering and Construction (ST) |
| Chairperson(s) | Pennung Warnitchai; |
| Examination Committee(s) | Thanakorn Pheeraphan;Punchet Thammarak; |
| Scholarship Donor(s) | BRIDGEX BINA SDN BHD, Malaysia; |
| Degree | Thesis (M. Eng.) - Asian Institute of Technology, 2020 |