There are very strict codes on removing, drilling or notching load bearing walls and floor joist.
有非常严格的代码去除，或缺口钻进墙壁和地板承载桁架。
Rational Calculation of Piled Foundation Joist Bearing Retaining Wall Structural Trimmer Joist Internal Forces
桩基托梁挡土墙结构托梁内力的合理计算
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