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（西南科技大學(xué)土木與建筑工程學(xué)院，綿陽 621010）
［摘要］結(jié)合四川綿陽某體育館鋼結(jié)構(gòu)網(wǎng)架實(shí)際工程，針對(duì)其在施工過程中遭遇地震影響且震后設(shè)防烈度提高的特殊性，采用ANSYS軟件建立網(wǎng)架有限元模型。首先對(duì)該網(wǎng)架結(jié)構(gòu)進(jìn)行反應(yīng)譜分析，得到結(jié)構(gòu)的內(nèi)力分布和變形情況，找出結(jié)構(gòu)的相對(duì)薄弱部位，進(jìn)行有針對(duì)性的加固補(bǔ)強(qiáng)。然后采用非線性時(shí)程分析法對(duì)比分析加固前后結(jié)構(gòu)的位移響應(yīng)，為在施工過程中受損且設(shè)防烈度提高后的網(wǎng)架結(jié)構(gòu)加固設(shè)計(jì)提供參考。結(jié)果表明：局部3層處桿件的截面大小及布置形式對(duì)網(wǎng)架結(jié)構(gòu)抗震性能影響大，對(duì)其進(jìn)行加固后可以適應(yīng)更高的設(shè)防烈度要求；采用位移作為網(wǎng)架結(jié)構(gòu)抗震性能指標(biāo)比較合理。
［關(guān)鍵詞］網(wǎng)架結(jié)構(gòu)；抗震加固；反應(yīng)譜；時(shí)程分析；ANSYS
中圖分類號(hào)：TU356文獻(xiàn)標(biāo)識(shí)碼：A文章編號(hào)：1002-848X(2012)02-0098-05
Numerical analysis research on seismic strengthening of a long-span space grid structure
Deng Yongjun，Yao Yong，Zhang Zhaoqiang，Chen Daiguo，Miao Xinle(School of Civil Engineering and Architecture, Southwest University of Science and Technology, Mianyang 621010, China)
Abstract:The finite element model of-a gymnasium with steel grid structure engineering of-in Mianyang was established, which encountered earthquake effects during construction process and the earthquake fortification intensity was improved. The spectrum analysis was-done at first, and the internal force distribution and deformation-were got. The relatively weak positions were found out, and the targeted strengthening and reinforcement were done. Then the structural displacements before and after reinforcement were compared by nonlinear time history analysis, which can provide reference for reinforcement design of grid structure which was damaged in the construction process and fortification intensity has been improved. The results show that the cross-section size and layout forms of local three-layer members have great influence on seismic performance of grid structure, and it can satisty higher fortification intensity requirements after being strengthened. It is reasonable that displacement indexes are used to judge the seismic performance of grid structure.
Keywords:grid structure；seismic strengthening；response spectrum；time history analysis； ANSYS
*四川省教育廳項(xiàng)目（08ZA012），校博士基金項(xiàng)目（08ZX0107）。
作者簡(jiǎn)介：鄧勇軍，碩士研究生，Email:516341369@qq.com。
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