Dynamic Behaviour Comparison of an Irregular Edifice with Different Locations of Floating Column and Shear Wall

Architects nowadays develop attractive edifices, and floating columns are widely employed in this process. Floating columns are used not only to provide a magnificent perspective but also when a vast open area is necessary. Edifices with irregular configurations are more vulnerable to earthquakes and hence, suitable shear wall placement is required to ensure the edifice's stability. Many multi-storey edifices collapsed in seconds after the Bhuj Earthquake (Jan 26, 2001), due to the presence of soft stories, floating columns, and mass anomalies. As a result, knowing the seismic reactions of these buildings are vital for constructing earthquake-resistant assemblies. The relevance of a Floating Column and the existence of a shear wall in an irregular multistorey building is highlighted in this study. Dynamic seismic behaviour of a G+18 irregular edifice with different locations of the floating column and different positions of the shear wall is explored in this research. The edifice is analysed and compared with the model without shear walls and floating columns to examine the alterations. The dynamic analysis is carried out using Response Spectrum Analysis and storey drift, storey displacement and base shear are calculated and finally, software compression is computed for different zones. The analysis is carried out by Indian standardized codes IS 1893:2016 and IS 456:2000 which are the codes specified by the Bureau of Indian Standards for earthquake resistance edifice design and plain and reinforcement concrete design respectively. Keywords: Floating Column, Shear Wall, Irregular Edifice, Seismic behaviour, Response Spectrum Analysis, storey drift, storey displacement, base shear.

Optimal structure control for earthquake resistance

This work developed the optimal and active control algorithms applicable to structural control for earthquake resistance. [Lewis, F. L., Vrabie, D. and Syrmos, V. L. [2012] Optimal Control (John Wiley & Sons)] developed a rigorous and comprehensive procedure for the derivation of an optimal control strategy based on the calculus of variation. This work is an application of Lewis’ formulation to the control of a structure for earthquake resistance. We developed a computer software which can be used to generate a dynamic model to simulate a planar structure and to construct the control law. This model also includes the tendon driven actuators, sensors and true history of earthquake excitation. The control law has two parts: (I) the feedback control which depends on the estimate state variables (Kalman filter) and (II) the record of the realistic earthquake excitation. The optimal control problem eventually leads to a two-point boundary value problem whose solution hinges on the knowledge of the entire history of the earthquake excitation. We employ true records of earthquake excitation as input. This approach enables one to solve the Riccati equations rigorously. Then, from the simulation results, one may study the relations between the control algorithm design and the characteristics (frequency, amplitude and duration) of earthquake excitation.

Earthquake Resistance Optimization and Evaluation of Bridge Piers Structural Form and Dimensions Based on Demand to Capacity Ratio and Yielding Points of Force-Displacement

The evaluation of structural safety must be taken after each earthquake. The importance losses of life and materials carries the significance of the works in the field of earthquake engineering. The purpose of this study was to optimize and evaluate the earthquake resistance of bridge piers by adopting different cross-section forms and dimensions for bridge supports under earthquake action. Two methods of seismic design were used in the optimization and evaluation process. These methods were demand to capacity ratio (DCR) and yielding point. The results of demand to capacity ratio shown that the values of DCR for all piers forms models were increased when the dimension of pier cross section were increased and the values of DCR became less than 1.0, indicating that the increasing in dimensions leading to rise the capacity of bridge supports to carry the earthquake loads in transverse and longitudinal direction. Comparing with models, solid wall pier form had the lower value of DCR, indicating that solid wall piers were suitable in the design of bridge supports to resist the lateral loads of earthquake and it has enough stiffness and capacity under earthquake action. The results of performance points shown that the yielding points were increased when the dimensions of piers were increased for all piers form in transverse and longitudinal direction. The maximum values were appeared within support No. 1 and support No. 4. Solid wall form of pier had the higher values of yielding points, meaning that this type of piers form had higher seismic capacity and it will resist the earthquake action more than others piers form. This study recommended that to use third model for each pier form in the design of bridges structures to resist the earthquake load. Also this study was recommended to use solid wall piers as supports in construction of bridge structure within areas had earthquake action.

Shaking Table Experiment on Seismic Performance of a Scaled-Down Arch Dam with Initial Crack

Seismic responses of cracked scaled-down arch dams were investigated by experiment on a shaking table. Two different curvature models (M1 and M2) were cast by using a plan concrete. Dams properties, including materials and dimensions, were carefully simulated. A significant earthquake magnitude with (7.7M) and water pressure were applied on the dam's models. Considering water and seismic loadings, the dynamic reactions of the arch dam's system were investigated. Both models showed crack overstresses or propagation on the dam's model as a result of seismic excitations. The arch dam with a higher degree of curvature was recorded 44 Mpa of stress evaluation which less by 30.7% of the arch dam with the lowest degree of curvature. The results indicated that raising the degree of curvature led to raising the dam's stability, earthquake resistance, less displacement, and less growth of tensile cracks.

Comparative Study of Seismic Analysis of Vertically Irregular R.C. Frame using INDIAN and EURO Code

This research article carried out on comparison of codes (Indian and Euro) for seismic behaviour of R.C building frame. The main cause for the earthquake occurred in the R.C. building, if there is any irregularity in the structure and, if the structure is not constructed with proper strength, and not appropriately designed, which causes the structures to completely collapse. It is critical to understand seismic analysis and construct earthquake resistance structures for the safety of a multi-story building against seismic forces. It has been observed that the Gulf countries’ construction requirements are primarily based on EURO standards. So that we analyse an R.C building frame of G+22 with vertical geometry irregularity using comparison with EURO standards and INDIAN standards. The response of the building is being calculated by the Response Spectrum approach with the help of ETABS software. The calculated results of an irregular building are then characterized graphically and in tabular form. This research paper concentrated on the variations in outcomes found by using these codes i.e., Indian & Euro code. This comparative result is performed in the form of Storey Drifts, Overturning moment, Storey shear, and Storey Displacement in the X, and Y direction.

ANALISIS STRUKTUR GEDUNG IRNA (INSTALASI RAWAT INAP) RUMAH SAKIT UMUM PASAMAN BARAT MENGGUNAKAN SNI BETON BERTULANG 2847:2019 DAN SNI GEMPA 1726:2019

Indonesia continues to follow the development of building standards in the world which are dynamically changing for the better and safer, both in loading regulations, planning for concrete structures, steel structures, and planning for earthquake resistance. The latest planning standard methods reviewed in this study are SNI-03-1726-2019, SNI-03-2847-2019 and RSNI-03-1727-2020 replacing SNI-03-1726-2012, SNI-03-1727-2013, and SNI-03-2847-2013. The basic difference in SNI-03-1726:2012 compared to SNI-03-1726:2019 is in the coefficients of Fa and Fv, namely the coefficient of soil sites for a long earthquake period of 1 second and in SNI-03-2847:2019 which refers to ACI 318M-14 Building Code Requirements for Structural Concrete. The results of this study found that this change in the modeling of the West Pasaman Regional General Hospital met the requirements for the SNI-03-1726-2019 earthquake design and the SNI-03-2847-2019 reinforced concrete design.

Seismic Effects on Different Structural Members

Civil engineers deal with constructing differing types of structures with guaranteeing safety, sturdiness and utility. Currently days “earthquake “is a natural tragedy that affects the structures with their safety and utility. The quantity of harm that earthquake will cause to structures is rely upon sort of building, sort of soil, Technology used for earthquake resistance, and last however not the smallest amount Location of building. Effects of earthquake area unit mostly counting on sort of soil within which foundation of building is finished as a result of earthquake changes the motion of ground that results the failure foundation. Therefore it's vital to check the behavior of various soils at the time of construction of structures. Earthquake will be resisted by varied technologies utilized in building, one amongst these area unit shear wall. It improves the structural performance of building subjected to lateral forces because of earthquake excitation. Much analysis comes area unit afoot worldwide for development of effective ways for estimating unstable demands for performance-based engineering of buildings.

Budaya Ketahanan Gempa pada Arsitektur Masjid Tradisional Indonesia

This research aimed to study the structure of traditional mosques in Indonesia in relation to the culture in constructing earthquake-resistant architecture on earthquake-prone areas. The research was conducted in qualitative descriptive manner by studying the construction of traditional mosques in Indonesia, the comparison of the construction’s character to the construction of mosques in non-prone areas, the condition of traditional mosques before and after the earthquake. Javanese mosques have different construction system than mosques on less earthquake areas. The structure relatively authentic, it is more resistant to earthquake than those that has undergone changes. It was concluded that large architectures such as mosques also have a construction tradition in relation to earthquake resistance.

STRUCTURAL BEHAVIOR OF CONNECTIONS BETWEEN CONCRETE COMPONENTS AND GUSSET PLATE WITH STUD BOLTS

Dampers are effective in ensuring the earthquake resistance of reinforced concrete (RC) buildings. Reliable connections between dampers and concrete components are critical for dampers to effectively function in RC buildings. In this study, the structural behavior of connections between concrete components and a gusset plate with stud bolts to join the damper to the RC buildings was analyzed. Component tests of the connections between the concrete components and the gusset plate with stud bolts were conducted. The specimen parameters were the arrangement of stud bolts and the presence or absence of a closing plate. As a result of the tests, the stiffness of the connections was different depending on the arrangement of the stud bolts. In addition, the specimen with the closing plates exhibited high stiffness and strength. Finally, an evaluation method for the force-displacement curve of the connections between the concrete components and the gusset plate with stud bolts is provided.