Usando o gerador de carga SkyCiv – MACHADOS 7-16 Cálculos de Carga Sísmica para Edifícios
SkyCiv introduces the seismic load calculation for buildings using ASCE 7-16 Equivalent Lateral Force procedure. In addition to the parameters for wind and snow loads, the seismic load calculation uses seismic parameters obtained from U.S. Geological Survey (USGS) Web Services. Users will get the following data that can be modified to get the most appropriate seismic load for the structure:
- Long-period transition period \( {T}_{eu} \)
- Design spectral response acceleration parameter at short period, \( {S}_{DS} \)
- Design spectral response acceleration parameter at 1s period, \( {S}_{D1} \)
- Mapped maximum considered earthquake spectral response acceleration parameter, \( {S}_{1} \)
Os usuários gratuitos poderão obter esses dados, mas só poderão calcular as cargas sísmicas para um máximo de 3 resolve por dia. Com um Conta Profissional ou adquirindo o Módulo gerador de carga autônomo, você pode usar todos os recursos de este cálculo pelo tempo que você quiser. Você pode comprar o módulo autônomo através deste link.
Dados do Site
Together with the wind speed and ground snow load data, users can get the seismic parameters for the location obtained from USGS Web Services by defining the “Site Class” first and then the location:
Figura 1. MACHADOS 7-16 additional parameter (site class) for obtaining site seismic parameters.
Figura 2. Site seismic parameters from USGS Web Services.
Users can modify the parameters obtained from USGS Web Services to obtain the most appropriate seismic load for the structure.
Dados de Estrutura
To calculate the seismic load for the structure, the structure data should be filled. além disso, a required site seismic parameters in Site Tab should have values defined. Estes são: \( {T}_{eu} \), \( {S}_{DS} \), \( {S}_{D1} \), e \( {S}_{1} \). By meeting these conditions, you can check the “Calculate Seismic Load” caixa de seleção.
Figura 3. Seismic parameters of the structure.
The seismic parameters needed to be defined are the following:
- Structure system – for determining the values of \({C}_{t} \) e \(x \) which will be used in calculating the approximate fundamental period of the structure \({T}_{uma} \)
- Approximate fundamental period of the structure \({T}_{uma} \) – can be user-defined to more appropriate seismic load calculation
- Fator de modificação de resposta \( R \) – default value is 8.5 and be modified for more appropriate seismic results
- Redundancy factor, \( ρ \) – default value is 1.0 and can be modified. Used in diaphragm forces calculation
- Floor Weights – used for the vertical distribution of base shear and for diaphragm forces. Data per level required are: Nível (for designation), Elevação, and Weight
The approximate fundamental period of the structure is automatically calculated as guide for the users when the “Structure system” dropdown is changed. Users are free to edit this value which is affect the corresponding calculated base shear for the structure.
Resultados
Assim que todos os parâmetros forem definidos, clicar no botão Gerar Cargas dará o resultado conforme mostrado abaixo.
Figura 4. Seismic input parameters used in the calculation.
Figura 5. Calculated seismic forces using the equivalent lateral force procedure.
Cálculo Detalhado
The detailed seismic load calculations can be accessed only by Usuários de conta profissional e aqueles que compraram o módulo gerador de carga autônomo. Todos os parâmetros e premissas usados no cálculo são exibidos no relatório para torná-lo transparente para o usuário. Você pode baixar uma amostra de cálculo detalhado através deste link.
Figura 6. Detailed seismic load calculation generated from SkyCiv Load Generator.
