The concept of the structural performance safety index is put forward and its calculation method is derived based on the structural deformation limit state equation.

提出了结构性能安全指数的概念，并以结构的变形极限状态方程为基础得到了结构设计性能安全指数的计算方法和结构性能等级的划分标准。

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The calculation method for freedom length of the anchor bar is improved, and the calculation formulae of structural foundation embedded depth and stability limit equilibrium analyses were derived.

改进了锚杆自由段长度的计算方法，推导了结构的基础埋深和稳定性极限平衡分析的计算公式。

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Taking three-axle vehicle as an example, the calculation formula of parking grade limit of multi-axle vehicle is derived with its influencing factors analyzed.

以三轴汽车为例，推导出多轴汽车的驻车极限坡度计算公式，并对其影响因素进行分析。

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Current restrictions on claiming the home office deduction, such as the requirement that a home office be used regularly and exclusively for business and the limit on the amount of the deduction tied to income derived from the particular business, still apply under the new option.

WHITEHOUSE: The Home Office Tax Deduction: Simplifying Rules And Helping Small Business Owners Succeed | The White House