传统住宅楼现浇结构铝木结合施工工艺研究

目前,国内多层、高层、超高层住宅楼大部分楼层都是相同的布局,称为标准层。结构差异的位置如避难层、地下室等称为非标层。标准层施工考虑其高度的统一性,可大面积应用住宅楼标准层铝合金模板施工工艺。铝模在非标层的使用可根据设计需要,通过铝木结合,在满足设计要求的前提下完成非标层的结构施工。

基于ANSYS的钢箱梁底板U肋在不同焊接顺序的焊接变形研究

采用有限元软件ANSYS建立了钢箱梁底板和3个U肋的组合焊接分析模型,结合生死单元技术研究不同焊接顺序对底板焊接变形的影响。考虑3个U肋的6个外焊道,设置3种不同焊接顺序的焊接方案,其他条件相同,研究焊接顺序对底板U肋的焊接变形的影响。研究发现:不同的焊接顺序,底板U肋的焊接纵向弯曲变形都呈中间大、边端小的规律,方案1和方案2的焊接变形大小相近,大于焊接方案3的焊接变形大小,和大桥钢板纵向弯曲变形经验公式计算值相符;而横向弯曲变形规律不同,焊接方案2和3的横向弯曲变形大小接近,大于焊接方案1的弯曲变形大小。

串列非粘结柔性立管碰撞影响规律分析

考虑基于骨架层和压缩铠装层各向异性中轴向材料属性,本文研究了串联非粘结柔性立管的碰撞规律影响特性。利用ABAQUS海工软件划分和加密典型八层非粘结柔性立管的最外层外护套层外表面参与碰撞的区域,讨论立管在不同的碰撞速度、管间摩擦系数和管内壁压单因素变量下,碰撞区域沿碰撞方向的应变、应力和碰撞力的时程曲线特性,总结对非粘结柔性立管碰撞影响规律。同时,对比单层立管与非粘结柔性立管的碰撞过程发现,两者都发生了多种碰撞行为,其中第一次碰撞过程最为剧烈。三个单因素变量对非粘结柔性立管的碰撞规律特性有不同影响。就立管的碰撞速度而言,在第一次碰撞过程中,碰撞力随碰撞速度的增加而增加,应变和应力呈现先增大然后减小的趋势;随着管间摩擦系数的增大,碰撞过程中应变和应力呈先减少后增加的趋势;碰撞中应变和应力随管内壁压的增加而增加。

Behavioral and Electrophysiological Responses to Caffeine of Helicoverpa armigera Larvae and H. assulta Larvae

The dual-choices tests of behavioral test were used to study the gustatory behavioral responses to caffeine of Helicoverpa armigera larvae and H. assulta larvae. Electrophysiological responses were studied by electrophysiological tip recording. Behavioral experiments showed that caffeine was a feeding deterrent for both larvae, but it showed a stronger feeding deterring effect on the oligophagous H. assulta . The electrophysiological tip-recording results showed that both H. armigera larvae and H. assulta larvae had one caffeine-sensitive feeding deterrent neuron at the medial sensilla, and the electrophysiological pulse response of H. assulta larvae was significantly stronger than that of H. armigera larvae. Therefore, caffeine had a stronger feeding deterring effect on the oligophagous H. assulta than the polyphagous H. armigera . The difference in behavioral effect was closely related to the sensitivity of to caffeine the feeding deterrent neurons at the medial sensilla.