單項(xiàng)選擇題當(dāng)梁在砌體上的實(shí)際支承長度a大于計(jì)算有效支承長度a0時(shí),梁端砌體局部受壓計(jì)算中應(yīng)?。ǎ?#8194;

A.a0
B.a
C.1/2(a+a0)
D.均可