艳遇伤身

上海初夏，略有燥热。当越来越多S型和倒三角型出现在大街小巷时，温度似乎又上窜了几度。编辑部李叔对此的分析是：许多人不是因为天气热而流汗，关键的原因是思想太热。     

水沟电缆槽整体式模架施工外观质量控制

电缆槽因结构设计复杂、断面尺寸小,造成电缆槽的线性和表面气泡等外观质量难以控制,文章针对电缆槽一次成型整体式模架在施工中出现的模板上浮影响线性和拆模后混凝土表面气泡超标的问题,通过对模板受力分析,采取增加结构件及标高预控等措施,有效减少模板上浮高度;通过在模板上增设附着式振动器并不断优化布置方案,测定附着式振动器作用时间,有效减少拆模后混凝土表面气泡含量。     

Containership structural design and optimization based on knowledge-based engineering and Gaussian process

Knowledge-based engineering （KBE） has made success in automobile and molding design industry, and it is introduced into the ship structural design in this paper. From the implementation of KBE, the deterministic design solutions for both rules design method （RDM） and interpolation design method （IDM） are generated. The corresponding finite element model is generated. Gaussian process （GP） is then employed to build the surrogate model for finite element analysis, in order to increase efficiency and maintain accuracy at the same time, and the multi-modal adaptive importance sampling method is adopted to calculate the corresponding structural reliability. An example is given to validate the proposed method. Finally, the reliabilities of the structures＇ strength caused by uncertainty lying in water corrosion, static and wave moments are calculated, and the ship structures are optimized to resist the water corrosion by multi-island genetic algorithm. Deterministic design results from the RDM and IDM are compared with each separate robust design result. The proposed method shows great efficiency and accuracy.