水电站门机变截面支腿的折算惯性矩

Equivalent inertia moment of supporting leg with varying cross section of a gantry crane used at hydraulic power station

对于采用变截面支腿的水电站门式起重机,在计算大车架内力时常把大车架分成主门架、侧门架和水平框架按平面框架计算内力。对于变截面支腿,用力法计算平面框架内力时要先计算折算惯性矩。本文以莫尔位移公式和辛普生数值积分公式为依据,推导了某段变截面支腿的侧门架折算惯性矩。

For a gantry crane used at hydraulic power station, which has supporting leg with varying cross section, it is a common practice in calculating internal force of gantry construction to divide it into main frame, side frame and horizontal frame, then to calculate internal force as for plane frames. For supporting leg with varying cross section, it is necessary to calculate equivalent inertia moment prior to calculating internal force of plane frames. Present paper deduces the formula for calculating equivalent inertia moment of supporting leg of side frame with varying cross section, based on Mole displacement formula and Simpson numeric integral formula.