工程科学学报
工程科學學報
공정과학학보
Journal of University of Science and Technology Beijing
2015年
2期
260-265
,共6页
钢筋混凝土梁%抗撞%冲击荷载%约束%防护
鋼觔混凝土樑%抗撞%遲擊荷載%約束%防護
강근혼응토량%항당%충격하재%약속%방호
reinforced concrete beams%impact resistance%impact loads%constraints%protection
在前期研究的刚柔复合防护结构体系的基础上,针对钢筋混凝土复合防护梁的抗撞性能进行了分析研究,重点在于探讨梁端约束条件可能对防护效果产生的影响。在数值模拟的过程中,分别考虑了无防护、刚性防护、柔性防护和阵列式刚柔复合防护四种不同的措施以及两端固支、两端铰支和一端固支一端铰支三种不同的梁端约束形式。通过观测钢筋混凝土梁的应变、位移、加速度、冲击力等参数,对比分析不同防护装置的抗撞效果。数值结果表明,在相同的冲击条件下,尽管复合防护的效果最优,但梁的约束形式仍对动力反应峰值的抑制效果有显著影响,其中又以两端固支梁的防护效果为最好。
在前期研究的剛柔複閤防護結構體繫的基礎上,針對鋼觔混凝土複閤防護樑的抗撞性能進行瞭分析研究,重點在于探討樑耑約束條件可能對防護效果產生的影響。在數值模擬的過程中,分彆攷慮瞭無防護、剛性防護、柔性防護和陣列式剛柔複閤防護四種不同的措施以及兩耑固支、兩耑鉸支和一耑固支一耑鉸支三種不同的樑耑約束形式。通過觀測鋼觔混凝土樑的應變、位移、加速度、遲擊力等參數,對比分析不同防護裝置的抗撞效果。數值結果錶明,在相同的遲擊條件下,儘管複閤防護的效果最優,但樑的約束形式仍對動力反應峰值的抑製效果有顯著影響,其中又以兩耑固支樑的防護效果為最好。
재전기연구적강유복합방호결구체계적기출상,침대강근혼응토복합방호량적항당성능진행료분석연구,중점재우탐토량단약속조건가능대방호효과산생적영향。재수치모의적과정중,분별고필료무방호、강성방호、유성방호화진렬식강유복합방호사충불동적조시이급량단고지、량단교지화일단고지일단교지삼충불동적량단약속형식。통과관측강근혼응토량적응변、위이、가속도、충격력등삼수,대비분석불동방호장치적항당효과。수치결과표명,재상동적충격조건하,진관복합방호적효과최우,단량적약속형식잉대동력반응봉치적억제효과유현저영향,기중우이량단고지량적방호효과위최호。
The impact-resistant performance of steel-reinforced concrete beams with a rigid-flexible composite structure was ana-lyzed based on our earlier research outcomes. The focus was to disscuss the influence of constraint forms on the crashworthy perform-ance of reinforced concrete beams with composite laminates. In the process of numerical simulation, the observed beam with four dif-ferent measures incluing the unprotected, the rigid protective, the flexible protective and the proposed one was considered separately. Meanwhile, three considered constraint forms of the beam ends were as follows:fixed at both ends;hingled at both ends;fixed at one end and hingled at the other end. Protective effects of the different measures were compared and analyzed by observing the strain, the displacement, the acceleration and the impact force of the target beam. Numerical results show that, under the same impact conditions the composite system can obtain the optimal protective effect, but constraint forms may have significant impact on suppression of the dynamic response of the beam. Especially, for the beam fixed at both ends the best protective effect may be obtained.