图中所示的拼接,板件分别为-240X8和-180X8,采用三面角焊缝连接,钢材Q235,焊条E43型,角焊缝的强度设计值=160MPa,焊脚尺寸hf=6mm。此焊缝连接可承担的静载拉力设计值的计算式为:
A.4X0.7X6X160X300+2X0.7X6X160X180 B.4X0.7X6X160X(300-10)+2X0.7X6X160X180 C.4X0.7X6X160X(300-10)+1.22X2X0.7X6X160X180 D.4X0.7X6X160X(300-2X6)+1.22X2X0.7X6X160X180正确答案D