A continuous hyperplasticity model named kinematic hardening modified cam clay (KHMCC) is a constitutive soil model based on thermodynamic principles. This model has addressed some shortcomings of the modified cam clay (MCC), specifically on small strain stiffness. Because of employing multiple surfaces plasticity, it can simulate a smooth transition from elastic to plastic behaviour as well as the effect of immediate past stress. This article aims to present some important issues on the numerical implementation of the continuous hyperplasticity non-linear KHMCC model. The incremental stress-strain response is calculated based on a rate-dependent algorithm. A significant advantage of the rate-dependent calculation is that it is not necessary to attach with the consistency condition during calculation of plastic strains. Effect of time step and number of yield surfaces in rate-dependent algorithm will be also presented. A discussion on using of numerical integration rules of hardening functions is addressed. Furthermore, model verification is performed against analytical solution of ideal undrained response which has been obtained from theoretical integration of the MCC function over the imposed stress or strain path. Finally, some numerical demonstrations are also carried out to illustrate several key features of the model.
Tulisan ini menyajikan usulan fungsi atenuasi terbaru untuk percepatan maksimum gempa di permukaan tanah tipe gempa subduksi interface dan intraslab pada moment magnitude lebih besar sama dengan 5 dan jarak 10 km sampai 500 km di batuan. Fungsi atenuasi telah dikembangkan dengan pendekatan Jaringan Syaraf Tiruan (JST) menggunakan algoritma propagasi balik. Studi memperlihatkan bahwa fungsi atenuasi berdasarkan JST akurat dan andal untuk memprediksi percepatan maksimum gempa. Studi parameter berbagai faktor input dari fungsi atenuasi juga telah dilakukan dan hasilnya akan disajikan di dalam tulisan ini.
Background: Nagan Raya Regency is included in the top 5 districts/cities with the fourth highest number of hepatitis in Aceh Province. The hepatitis B screening program has not been implemented properly. The impact of the low coverage of this program affects public ignorance about the spread of hepatitis B from sufferers to other communities.Objective: This study aims to analyze the participation factors for Hepatitis B screening in pregnant women in the working area of the Ujong Patihah Health Center.Method: This research design is cross sectional study, in 2021. Data were collected using a questionnaire with a sample size of 220 pregnant women. Data collection was carried out by direct interviews with respondents, using a questionnaire instrument. Data analysis used the Cgi-square statistical test with a significance level of 95%, and continued with multivariate analysis using the Binary Logistics Regression test.Results: Bivariate analysis showed that there was a relationship between knowledge (p= 0.022), mother's attitude (p= 0.010), husband's role (p = 0.018), role of health workers (p = 0.028) and participation in hepatitis B screening, while education did not affect participation in hepatitis B screening (p= 0.668). Multivariate results showed that the mother's attitude was the dominant factor for participation in hepatitis B screening (OR= 2.24).Conclusion: Positive attitudes had a 2.24 times relationship to the participation of pregnant women in hepatitis B screening than negative attitudes.
Abstract. Earthquakes can damage thousands of buildings and infrastructure as well as cause the loss of thousands of lives. During an earthquake, the damage to buildings is mostly caused by the effect of local soil conditions. Depending on the soil type, the earthquake waves propagating from the epicenter to the ground surface will result in various behaviors of the soil. Several studies have been conducted to accurately obtain the soil response during an earthquake. The soil model used must be able to characterize the stress-strain behavior of the soil during the earthquake. This paper compares equivalent linear and nonlinear soil model responses. Analysis was performed on two soil types, Site Class D and Site Class E. An equivalent linear soil model leads to a constant value of shear modulus, while in a nonlinear soil model, the shear modulus changes constantly, depending on the stress level, and shows inelastic behavior. The results from a comparison of both soil models are displayed in the form of maximum acceleration profiles and stress-strain curves.
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