Application of soundless broken preparation in concrete and steel reinforced concrete demolishment 无声破碎剂在混凝土和钢筋混凝土拆除中的应用
2.
Since the world war ii , the side effect of science and technology appears gradually , especially for nuke crisis and demolishment of environments “二战”以来，科技的负面效应逐渐突现出来，特别是核危机、生态环境的污染与破坏。
3.
The expressway construction made a great harmful impact to ecological environment . in order to eliminate the demolishment , the expressway greening hadbeen an important part of the expressway construction 高速公路的建设对生态环境造成了极大的影响，为降低这种破坏程度，高速公路绿化已成为高速公路建设中一项不可缺少的内容。
4.
After fulfilled the fpga circuit design , we achieved our expectation by simulation and system test . we proved that our system could prevent our local network data transmission from modification and demolishment in some degree 整体系统的模拟和实际测试表明该加密网卡电路基本上完成了设计功能，达到设计指标，在相当的程度上为局域网上的数据传输起到了安全的保护作用。
5.
For meeting the related nantional standards and avoiding demolishment of the building , the underpinning and strengthening methods are used , with which the loads of center column are underpined by the diagonal steel strut and the cross - sectional areas of side pillar are strengthened , both ends of shear wall are chiseled in turn and then concrete is poured again 通过采用斜向钢支撑荷载转移法实现对中柱的托换，采用剪力墙两端分批凿除后再浇捣实现对剪力墙的托换，采用增加截面法对边柱进行加固，使建筑物经托换和加固后能满足国家有关规范的要求。
6.
In this paper , the state of the art of the engineering controlled explosion and the finite element method ( fem ) are reviewed . in order to analyze and simulate the demolishment of frame - structured buildings due to controlled blasting , the method of killing or activating elements , a high level technique in fem , and the special element - solid65 are introduced to the blasting field first in china by the author 本文回顾和总结了工程控制爆破和有限单元法的发展历史及其研究现状，在国内首次把单元生死法这一有限元高级处理技术和ansys软件中特有的solid65单元引入到爆破拆除工程领域，用其进行框架结构楼房爆破拆除的计算机模拟，探讨了构件在完全破坏前的应力、应变、裂缝生成和塑性铰形成位置。
7.
Firstly , the three main harmful factors " characters and rules , theirs effect on civil house , demolishment criterion and control measure will be researched systemically . secondly , fuzzy mathematics , system arrangement analytical method and expert consultation method are put forward and discussed specially to set up civil house security fuzzy multi - arrangement elevation model , to evaluate blasting harmful factors " effect to neighborhood civil house ' s safety in the construction of express way , to predict the security of civil house and to bring forward control measures . lately , the forecast of the civil houses " safety by using bp neural net model and optimize of the blasting parameters will also be discussed in the dissertation 本文的主要研究工作有：系统地研究了爆破地震、爆破飞石、爆破空气冲击波三大有害因素的特征及规律、对民房的影响、破坏判据和控制措施；提出并重点论述采用模糊数学和系统层次分析法及专家咨询法建立民房安全性模糊多层次评价模型，对高速公路建设中爆破有害因素对邻近民房安全进行评价，预测民房安全性，提出控制措施；利用bp神经网络模型对民房安全进行预测，并对爆破参数进行优化。
