The above fruits may be of important theoretical significance and of practical value for reasonably using the results of model test of reinforced concrete structures to forecast and judge the character of crack development of prototype structures and for founding more reasonable calculating formula of crack width henceforth 上述研究成果有益于合理利用钢筋混凝土结构模型试验的结果预测和评判原型结构的裂缝开展情况，及建立更为合理的裂缝宽度计算公式。
The cast - in - place slab with large - area without special requirement can work with cracks , but the largest crack width must be less than that stipulated in the code of gb50010 - 2002 . hence , the control principle of cast - in - place slab with large - area is to limit the crack , that is , to control the width of crack in the allowable range as stipulated by the code 在规范gb50010 ? 2002中规定无特殊使用和工艺要求的大面积现浇楼盖结构允许带裂缝工作，因此，大面积现浇楼盖结构裂缝控制的原则是限裂，即限制裂缝开展宽度在规范规定的允许最大裂缝宽度范围内。
Therefore , the scientific scholarsboth at home and abroad have been carried series of research work since the 1960s , with some defects still remaining unresolved . the objects of this research are : ( 1 ) to analyze the course of the crack , itsappearing and development , and discuss the major factors influencing the behavior ofthe negative moment region in continuous composite beam . ( 2 ) to establish the modeand formulas of the crack width by the theoretical analysis 本文研究的主要目的是通过对组合梁负弯矩区裂缝的出现、发展的过程分析,讨论影响钢-混凝土连续组合梁负弯矩区受力性能的主要因素,建立了组合梁负弯矩区裂缝计算模式和裂缝宽度的计算公式,并初步探讨了连续组合梁合理截面形式。
Experimental results indicate that the strength capacity , stiffness of columns have a certain extent increasing as a result of the action of cfrp , repaired columns " cracks show little and distribute uniformly . the ultimate strength and ductility of column improved due to the transverse strengthening with cfrp and display more distinct benefit when strengthened by the combined action of the longitudinal and the transverse straps of cfrp . in addition , many parameters including anchorage length of cfrp , thickness of cfrp are considered on the effects of cfrp on strength , and failure modes of columns 试验结果表明，大偏心受压柱受拉面纵向粘贴碳纤维布后，偏压柱承载力和抗弯刚度有一定程度的提高，裂缝宽度减小且分布均匀；碳纤维布横向粘贴偏压柱对偏压柱的承载力和延性有一定的提高；纵横向混合粘贴大偏压柱加固效果更显著；混凝土强度低于c20级时，不适合采用碳纤维布粘贴加固。
Based on the experimental study and theoretical analysis about the concrete members reinforced with cold - rolled ribbed bars subjected to bending , the correction formula about calculating deformation and crack width have been presented , and the calculated results relatively conform to the experimental results . the research results will be helpful to the development and application of the cold - rolled ribbed bars . 3tabs . , 6refs 在试验研究的基础上，分析了冷轧带肋钢筋受弯构件的裂缝宽度和挠度变形规律，提出了其裂缝宽度和挠度验算修正公式，修正值与实测值吻合较好，有利于冷轧带肋钢筋的进一步推广应用.表3 ，参6
( 3 ) to discuss thereasonable section shape of the continuous composite beam . the works of this paperare as follows : ( 1 ) contrast the cracking course of the concrete beam and the composite beam , atthe point of the bending state of the beams , put forward the crack width mode : bending curvature 、 crack height 、 the distance between crack 据此,本文的主要研究成果如下: ( 1 )通过分析、对比普通混凝土梁和组合梁负弯矩区裂缝出现、发展过程,以构件受弯状态为出发点,提出了以弯曲曲率、裂缝高度、裂缝间距为主要参数的裂缝宽度计算模式。
3 , carry out detailed numerical simulation and analysis for heat extraction of deep - seated hdr based on the tengcong prefecture , reach the major variety rule of rock mass stress , temperature , fracture width depending on the heat extraction . ( 1 ) in the hot dry rock geotherraal energy extraction system , transportation of energy and flow of water arise mainly through the fracture , the lower temperature water attain the high temperature from the injection well to production well through conduction convection and take away the thermal from wall rock 3 、认真地对腾冲高温岩体地热开发进行了数值模拟计算和分析，得出了地热开发过程中岩体应力、温度以及裂缝宽度随地热提取的变化规律等重要结论： ( 1 )在高温岩体地热开发系统中，能量的运移、输送与水的流动主要通过裂缝面发生，注入的低温水在流到生产井的过程中，发生传导、对流、吸收围岩热量，达到升温的目的。
A way to avoiding crack or reducing crack width of concrete or reducing distortion of member is using prestressed concrete . the writer tried to make full use of the merit of the prestressed concrete and designed prestressed concrete mandril to control crack of structure . the prestressed concrete mandril , which was firstly applied high pressure on a small concrete bar , and then was made in concrete , so it would act as reinforced bar and resist load . in this thesis the writer designed 24 mmnbers and had experimental study of them , reached the conclusion that the effect of resisting crack of the prestressed concrete mandril was good when the load was not large , it can enhance the capacity of resisting crack and reduce the crack distance and crack width , but when the loads was large , the effect of resisting crack was not good , when we used the prestressed concrete mandril and reinforced bar together in member , the effect of resisting crack was very good . the writer analysed the adherence mechanism and wreck mechanism of the prestressed concrete mandril in anxial tension members , and according to the character of the prestressed concrete mandril , the writer constructed the bond model of it . then the writer introduced the analysis theory of crack including the bond - slip theory , the non - slip theory , the synthesis theory and mathematics stat method . the different theory had different theory base , they considered that the primary affection of crack width was different . in this test , the crack distance and crack width of members which placed reinforced bar were match to the compute value of the code gb 50010 - 2002 very well . to the members which 本文共进行了24根试件的试验研究,得出了预应力混凝土芯棒能较大地提高构件抗裂承载力,在荷载小于预应力混凝土芯棒的开裂荷载时有较好的抗裂效果,能较大地减小裂缝间距和裂缝宽度,但是当荷载较大预应力混凝土芯棒开裂时预应力混凝土芯棒的抗裂效果不是很好,若将普通钢筋和预应力混凝土芯棒一起使用时则有很好的抗裂效果。本文分析了预应力混凝土芯棒在轴拉试件中的粘结机理和破坏机理,根据预应力混凝土芯棒本身的特点,提出了预应力混凝土芯棒与后浇混凝土之间的粘结模型。然后本文详细介绍了经典的裂缝分析理论粘结滑移理论、无滑移理论、综合理论和数理统计方法,各理论有着各自不同的理论基础,认为影响裂缝宽度的主要影响因素也各不相同。
3 . the mid - span deflection of slight corrosion specimens is smaller than that of non - corrosion specimens on the static loads and the fatigue loads ; the maximum crack width of slight corrosion specimens is larger than that of non - corrosion specimens ; fatigue life of slight corrosion specimens is shorter than that of non - corrosion specimens ; the corrosion of re - bars is a sensitive factor to fatigue life ( 3 )轻微锈蚀试件梁的跨中挠度在静载和循环荷载下比未锈蚀梁小;轻微锈蚀试件梁的最大裂缝宽度比未锈蚀试件梁的最大裂缝宽度大;轻微锈蚀试件梁的疲劳寿命比未锈蚀试件梁的疲劳寿命降低,钢筋锈蚀是疲劳寿命的敏感因素。
By combining the conventional log data with the data on imaging logging , core , drilling - log and production test , etc . , and on the basis of carrying out various additional conduction corrections for resistivites , the fracture opening may be calculated by use of the difference between the resistivities of dual laterallog ; the fracture porosity can be estimated according to a simplified dual laterolog interpretation formula ; and the fracture permeability may be acquired in light of the experimental relation between the fracture widths and the fracture permeabilities 将常规测井资料与成像测井、岩心、录井、试油等资料相结合，在对电阻率进行各种附加导电校正的基础上，利用双侧向电阻的差异计算裂缝张开度，根据简化的双侧向解释公式计算裂缝孔隙度，根据裂缝宽度与裂缝渗透率实验关系求解裂缝渗透率。
