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Comparative Investigation on Mode Shapes and Natural Frequency of Low-Rise RC Frame Building
In general, the building is designed as per codal provisions, which has various constraints while analysing with dynamic loads. This analysis procedure takes a lot of time and is complex. Therefore, most Civil Engineering structures are designed taking the assumption of applied loading to be static. The process of neglecting the dynamic forces may lead to the collapse of the structure as a whole in case of a catastrophe such as an earthquake. Some recent earthquakes have shown the need for dynamic analysis. Nowadays, a lot of research is going on in this field of dynamic analysis such that the structure can withstand earthquake-induced loads. There are many theoretical formulas available in seismic codes of different countries, which relate the height of the building with the natural period of vibration of the structure. The link is a force-based design approach and it gives a rough estimate and approximation of the period. This process predicts the lateral forces by acceleration spectrum. The displacement demand gives the exact indication of the expected damage. In this paper, the fundamental periods of a case study of a low-rise building are investigated using the Equivalent Static Method and Response Spectrum Method using IS 1893(Part 1) and finite element modelling in SeismoStruct. The fundamental periods from these approaches are estimated to be 0.39 s, 0.14 s, and 0.178 s respectively. The factors are discussed on which fundamental period of a structure depends. However, the results show satisfactory relative error in range (1–30%), SeismoStruct gave realistic values of natural frequency because Indian code gives regular mode shape. The limitations of performing codal analysis are also reviewed in this paper.
Comparative Investigation on Mode Shapes and Natural Frequency of Low-Rise RC Frame Building
In general, the building is designed as per codal provisions, which has various constraints while analysing with dynamic loads. This analysis procedure takes a lot of time and is complex. Therefore, most Civil Engineering structures are designed taking the assumption of applied loading to be static. The process of neglecting the dynamic forces may lead to the collapse of the structure as a whole in case of a catastrophe such as an earthquake. Some recent earthquakes have shown the need for dynamic analysis. Nowadays, a lot of research is going on in this field of dynamic analysis such that the structure can withstand earthquake-induced loads. There are many theoretical formulas available in seismic codes of different countries, which relate the height of the building with the natural period of vibration of the structure. The link is a force-based design approach and it gives a rough estimate and approximation of the period. This process predicts the lateral forces by acceleration spectrum. The displacement demand gives the exact indication of the expected damage. In this paper, the fundamental periods of a case study of a low-rise building are investigated using the Equivalent Static Method and Response Spectrum Method using IS 1893(Part 1) and finite element modelling in SeismoStruct. The fundamental periods from these approaches are estimated to be 0.39 s, 0.14 s, and 0.178 s respectively. The factors are discussed on which fundamental period of a structure depends. However, the results show satisfactory relative error in range (1–30%), SeismoStruct gave realistic values of natural frequency because Indian code gives regular mode shape. The limitations of performing codal analysis are also reviewed in this paper.
Comparative Investigation on Mode Shapes and Natural Frequency of Low-Rise RC Frame Building
Lecture Notes in Civil Engineering
Gupta, Ashok Kumar (editor) / Shukla, Sanjay Kumar (editor) / Azamathulla, Hazi (editor) / Sharma, Pushkar (author) / Gupta, Tanmay (author)
Advances in Construction Materials and Sustainable Environment ; Chapter: 72 ; 885-898
2021-12-15
14 pages
Article/Chapter (Book)
Electronic Resource
English
STRUCTURAL FRAME FOR HIGH-RISE BUILDING AND HIGH-RISE BUILDING
| European Patent Office | 2018