
按結構形式和(he)受(shou)力特點樓梯(ti)形式可分(fen)為(wei)板式、梁式、懸挑(剪刀)式和(he)螺旋式,前兩種屬(shu)于平面受(shou)力體系,后兩種則為(wei)空(kong)間受(shou)力體系。
板(ban)(ban)(ban)式(shi)(shi)樓梯(ti)是(shi)(shi)由(you)梯(ti)段(duan)(duan)板(ban)(ban)(ban)、平臺(tai)板(ban)(ban)(ban)和平臺(tai)梁組(zu)成。梯(ti)段(duan)(duan)板(ban)(ban)(ban)是(shi)(shi)一(yi)塊帶踏(ta)步的斜板(ban)(ban)(ban),斜板(ban)(ban)(ban)支(zhi)承于(yu)(yu)上(shang)、下平臺(tai)梁上(shang),底層下端支(zhi)承在地(di)壟墻上(shang)。板(ban)(ban)(ban)式(shi)(shi)樓梯(ti)的優點(dian)是(shi)(shi)梯(ti)段(duan)(duan)板(ban)(ban)(ban)下表面平整,支(zhi)模簡單;其缺點(dian)是(shi)(shi)梯(ti)段(duan)(duan)板(ban)(ban)(ban)跨度(du)較大時,斜板(ban)(ban)(ban)厚度(du)較大,結構材(cai)料用(yong)量較多(duo)。因此(ci)板(ban)(ban)(ban)式(shi)(shi)樓梯(ti)適用(yong)于(yu)(yu)可變(bian)荷載較小、梯(ti)段(duan)(duan)板(ban)(ban)(ban)跨度(du)一(yi)般不大于(yu)(yu)3m的情(qing)況。
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