按(an)結構形(xing)式和受(shou)力(li)特點樓(lou)梯形(xing)式可分為板式、梁式、懸挑(剪刀)式和螺旋式，前兩種屬于(yu)平面受(shou)力(li)體系，后兩種則為空(kong)間受(shou)力(li)體系。

板(ban)(ban)(ban)式(shi)(shi)樓梯是由梯段(duan)(duan)板(ban)(ban)(ban)、平(ping)臺(tai)板(ban)(ban)(ban)和平(ping)臺(tai)梁組成。梯段(duan)(duan)板(ban)(ban)(ban)是一(yi)塊帶踏步的斜(xie)板(ban)(ban)(ban)，斜(xie)板(ban)(ban)(ban)支(zhi)承(cheng)于上、下平(ping)臺(tai)梁上，底層下端支(zhi)承(cheng)在地壟墻(qiang)上。板(ban)(ban)(ban)式(shi)(shi)樓梯的優點是梯段(duan)(duan)板(ban)(ban)(ban)下表面(mian)平(ping)整，支(zhi)模簡單(dan);其缺(que)點是梯段(duan)(duan)板(ban)(ban)(ban)跨度(du)較(jiao)(jiao)大時，斜(xie)板(ban)(ban)(ban)厚度(du)較(jiao)(jiao)大，結構材料用(yong)量較(jiao)(jiao)多。因此板(ban)(ban)(ban)式(shi)(shi)樓梯適用(yong)于可變荷載較(jiao)(jiao)小、梯段(duan)(duan)板(ban)(ban)(ban)跨度(du)一(yi)般不大于3m的情況。