單層柱面網(wǎng)殼抗連續(xù)倒塌性能

楊秀來　徐穎　韓慶華

摘要：研究了不同荷載布置形式、支承方式條件下，單層柱面網(wǎng)殼的抗連續(xù)倒塌性能和倒塌破壞模式，采用基于構(gòu)件承載能力的敏感性評(píng)價(jià)指標(biāo)，分析了初始缺陷、壓桿失穩(wěn)等因素對(duì)桿件、節(jié)點(diǎn)敏感性指標(biāo)的影響。結(jié)果表明，當(dāng)采用四邊支承時(shí)，滿跨均布荷載起控制作用，跨中節(jié)點(diǎn)為敏感構(gòu)件，與之相鄰斜桿為關(guān)鍵構(gòu)件；當(dāng)采用縱向兩邊支承時(shí)，半跨均布荷載起控制作用，桿件和節(jié)點(diǎn)的敏感性指標(biāo)在1/3跨處最大，支座處最小。當(dāng)考慮初始缺陷時(shí)，桿件、節(jié)點(diǎn)重要性系數(shù)分別增大了41%和53%；當(dāng)考慮壓桿失穩(wěn)時(shí)，桿件和節(jié)點(diǎn)重要性系數(shù)分別增大了45%和62%。通過對(duì)關(guān)鍵構(gòu)件進(jìn)行加強(qiáng)，可以優(yōu)化該類結(jié)構(gòu)的抗連續(xù)倒塌性能。

關(guān)鍵詞：單層柱面網(wǎng)殼；重要性系數(shù)；敏感性指標(biāo)；關(guān)鍵構(gòu)件；連續(xù)倒塌

中圖分類號(hào)：TU393.3

文獻(xiàn)標(biāo)志碼：A文章編號(hào)：16744764（2016）01010009

Abstract：

We studied the progressive collapse performance of cylindrical latticed shell and its failure modes indifferent load distribution and boundary conditions. By using the sensitivity assessment index based on the ultimate bearing capacity of components， the influence of imperfection and buckling of compressive rods on the sensitivity index of the rods and nodes. The results show that in the fourside boundary condition， the full uniformdistribution load is mainly controlling. Nodes at the midspan are the sensitive components and the adjacent rods are the key components. In twoside longitudinal boundary condition， the half uniformdistribution load is basically controlling. The largest sensitivity index of the rods and nodes are found at 1/3 span， and the smallest is adjacent to the support. Considering the structural imperfection， the important coefficients of the rods and nodes increase by 41% and 53% respectively； and considering the effect of buckling of compressive rods， increase by 45% and 62% respectively. So we can optimize the progressive collapse performance of cylindrical latticed shell by strengthening the key components.

Keywords：cylindrical latticed shell； important coefficient； sensitivity index； key component； progressive collapse

連續(xù)性倒塌是指結(jié)構(gòu)在非常規(guī)荷載作用（主要包括炸藥爆炸、氣體爆炸、車輛撞擊和重物沖擊以及極端雪荷載等） 下，其局部破壞不斷擴(kuò)展并最終形成和結(jié)構(gòu)初始破壞面積不成比例的破壞，甚至導(dǎo)致結(jié)構(gòu)倒塌的過程。近年來，大跨空間結(jié)構(gòu)連續(xù)倒塌事故屢有發(fā)生。例如2004年法國戴高樂機(jī)場候機(jī)廳因頂棚穿孔而導(dǎo)致結(jié)構(gòu)大面積坍塌[1]；2009馬來西亞Sultan Mizan Zainal Abidin體育場因支承失效引起其屋頂整體倒塌；2010年美國橄欖球場Hubert H. Humphrey Metrodome由于堆積雪荷載而引起屋頂?shù)顾鶾2]；2014年韓國慶州度假村場館在極端雪荷載作用下發(fā)生坍塌事故等。

學(xué)者們已經(jīng)對(duì)各類建筑結(jié)構(gòu)的抗連續(xù)倒塌性能進(jìn)行了40多年研究，取得了不少研究成果，并制定了相關(guān)的設(shè)計(jì)規(guī)程。……